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441x 18x 423x 6x 417x 417x 475x 475x 396x 79x 18x 61x 61x | /* Copyright 2008-2010 University of Cambridge Copyright 2008-2009 University of Toronto Copyright 2010-2011 Lucendo Development Ltd. Copyright 2010-2014 OCAD University Copyright 2012-2014 Raising the Floor - US Copyright 2014-2017 Raising the Floor - International Licensed under the Educational Community License (ECL), Version 2.0 or the New BSD license. You may not use this file except in compliance with one these Licenses. You may obtain a copy of the ECL 2.0 License and BSD License at https://github.com/fluid-project/infusion/raw/master/Infusion-LICENSE.txt */ var fluid_3_0_0 = fluid_3_0_0 || {}; (function ($, fluid) { "use strict"; /** NOTE: The contents of this file are by default NOT PART OF THE PUBLIC FLUID API unless explicitly annotated before the function **/ /** MODEL ACCESSOR ENGINE **/ /** Standard strategies for resolving path segments **/ fluid.model.makeEnvironmentStrategy = function (environment) { return function (root, segment, index) { return index === 0 && environment[segment] ? environment[segment] : undefined; }; }; fluid.model.defaultCreatorStrategy = function (root, segment) { Eif (root[segment] === undefined) { root[segment] = {}; return root[segment]; } }; fluid.model.defaultFetchStrategy = function (root, segment) { return root[segment]; }; fluid.model.funcResolverStrategy = function (root, segment) { if (root.resolvePathSegment) { return root.resolvePathSegment(segment); } }; fluid.model.traverseWithStrategy = function (root, segs, initPos, config, uncess) { var strategies = config.strategies; var limit = segs.length - uncess; for (var i = initPos; i < limit; ++i) { if (!root) { return root; } var accepted; for (var j = 0; j < strategies.length; ++j) { accepted = strategies[j](root, segs[i], i + 1, segs); if (accepted !== undefined) { break; // May now short-circuit with stateless strategies } } if (accepted === fluid.NO_VALUE) { accepted = undefined; } root = accepted; } return root; }; /* Returns both the value and the path of the value held at the supplied EL path */ fluid.model.getValueAndSegments = function (root, EL, config, initSegs) { return fluid.model.accessWithStrategy(root, EL, fluid.NO_VALUE, config, initSegs, true); }; // Very lightweight remnant of trundler, only used in resolvers fluid.model.makeTrundler = function (config) { return function (valueSeg, EL) { return fluid.model.getValueAndSegments(valueSeg.root, EL, config, valueSeg.segs); }; }; fluid.model.getWithStrategy = function (root, EL, config, initSegs) { return fluid.model.accessWithStrategy(root, EL, fluid.NO_VALUE, config, initSegs); }; fluid.model.setWithStrategy = function (root, EL, newValue, config, initSegs) { fluid.model.accessWithStrategy(root, EL, newValue, config, initSegs); }; fluid.model.accessWithStrategy = function (root, EL, newValue, config, initSegs, returnSegs) { // This function is written in this unfortunate style largely for efficiency reasons. In many cases // it should be capable of running with 0 allocations (EL is preparsed, initSegs is empty) if (!fluid.isPrimitive(EL) && !fluid.isArrayable(EL)) { var key = EL.type || "default"; var resolver = config.resolvers[key]; Iif (!resolver) { fluid.fail("Unable to find resolver of type " + key); } var trundler = fluid.model.makeTrundler(config); // very lightweight trundler for resolvers var valueSeg = {root: root, segs: initSegs}; valueSeg = resolver(valueSeg, EL, trundler); if (EL.path && valueSeg) { // every resolver supports this piece of output resolution valueSeg = trundler(valueSeg, EL.path); } return returnSegs ? valueSeg : (valueSeg ? valueSeg.root : undefined); } else { return fluid.model.accessImpl(root, EL, newValue, config, initSegs, returnSegs, fluid.model.traverseWithStrategy); } }; // Implementation notes: The EL path manipulation utilities here are equivalents of the simpler ones // that are provided in Fluid.js and elsewhere - they apply escaping rules to parse characters . // as \. and \ as \\ - allowing us to process member names containing periods. These versions are mostly // in use within model machinery, whereas the cheaper versions based on String.split(".") are mostly used // within the IoC machinery. // Performance testing in early 2015 suggests that modern browsers now allow these to execute slightly faster // than the equivalent machinery written using complex regexps - therefore they will continue to be maintained // here. However, there is still a significant performance gap with respect to the performance of String.split(".") // especially on Chrome, so we will continue to insist that component member names do not contain a "." character // for the time being. // See http://jsperf.com/parsing-escaped-el for some experiments fluid.registerNamespace("fluid.pathUtil"); fluid.pathUtil.getPathSegmentImpl = function (accept, path, i) { var segment = null; if (accept) { segment = ""; } var escaped = false; var limit = path.length; for (; i < limit; ++i) { var c = path.charAt(i); if (!escaped) { if (c === ".") { break; } else if (c === "\\") { escaped = true; } else if (segment !== null) { segment += c; } } else { escaped = false; if (segment !== null) { segment += c; } } } if (segment !== null) { accept[0] = segment; } return i; }; var globalAccept = []; // TODO: reentrancy risk here. This holder is here to allow parseEL to make two returns without an allocation. /* A version of fluid.model.parseEL that apples escaping rules - this allows path segments * to contain period characters . - characters "\" and "}" will also be escaped. WARNING - * this current implementation is EXTREMELY slow compared to fluid.model.parseEL and should * not be used in performance-sensitive applications */ // supported, PUBLIC API function fluid.pathUtil.parseEL = function (path) { var togo = []; var index = 0; var limit = path.length; while (index < limit) { var firstdot = fluid.pathUtil.getPathSegmentImpl(globalAccept, path, index); togo.push(globalAccept[0]); index = firstdot + 1; } return togo; }; // supported, PUBLIC API function fluid.pathUtil.composeSegment = function (prefix, toappend) { toappend = toappend.toString(); for (var i = 0; i < toappend.length; ++i) { var c = toappend.charAt(i); if (c === "." || c === "\\" || c === "}") { prefix += "\\"; } prefix += c; } return prefix; }; /* Escapes a single path segment by replacing any character ".", "\" or "}" with itself prepended by \ */ // supported, PUBLIC API function fluid.pathUtil.escapeSegment = function (segment) { return fluid.pathUtil.composeSegment("", segment); }; /* * Compose a prefix and suffix EL path, where the prefix is already escaped. * Prefix may be empty, but not null. The suffix will become escaped. */ // supported, PUBLIC API function fluid.pathUtil.composePath = function (prefix, suffix) { if (prefix.length !== 0) { prefix += "."; } return fluid.pathUtil.composeSegment(prefix, suffix); }; /* * Compose a set of path segments supplied as arguments into an escaped EL expression. Escaped version * of fluid.model.composeSegments */ // supported, PUBLIC API function fluid.pathUtil.composeSegments = function () { var path = ""; for (var i = 0; i < arguments.length; ++i) { path = fluid.pathUtil.composePath(path, arguments[i]); } return path; }; /* Helpful utility for use in resolvers - matches a path which has already been parsed into segments */ fluid.pathUtil.matchSegments = function (toMatch, segs, start, end) { if (end - start !== toMatch.length) { return false; } for (var i = start; i < end; ++i) { if (segs[i] !== toMatch[i - start]) { return false; } } return true; }; fluid.model.unescapedParser = { parse: fluid.model.parseEL, compose: fluid.model.composeSegments }; // supported, PUBLIC API record fluid.model.defaultGetConfig = { parser: fluid.model.unescapedParser, strategies: [fluid.model.funcResolverStrategy, fluid.model.defaultFetchStrategy] }; // supported, PUBLIC API record fluid.model.defaultSetConfig = { parser: fluid.model.unescapedParser, strategies: [fluid.model.funcResolverStrategy, fluid.model.defaultFetchStrategy, fluid.model.defaultCreatorStrategy] }; fluid.model.escapedParser = { parse: fluid.pathUtil.parseEL, compose: fluid.pathUtil.composeSegments }; // supported, PUBLIC API record fluid.model.escapedGetConfig = { parser: fluid.model.escapedParser, strategies: [fluid.model.defaultFetchStrategy] }; // supported, PUBLIC API record fluid.model.escapedSetConfig = { parser: fluid.model.escapedParser, strategies: [fluid.model.defaultFetchStrategy, fluid.model.defaultCreatorStrategy] }; /** CONNECTED COMPONENTS AND TOPOLOGICAL SORTING **/ // Following "tarjan" at https://en.wikipedia.org/wiki/Tarjan%27s_strongly_connected_components_algorithm /** Compute the strongly connected components of a graph, specified as a list of vertices and an accessor function. * Returns an array of arrays of strongly connected vertices, with each component in topologically sorted order. * @param {Vertex[]} vertices - An array of vertices of the graph to be processed. Each vertex object will be polluted * with three extra fields: `tarjanIndex`, `lowIndex` and `onStack`. * @param {Function} accessor - A function that returns the accessor vertex or vertices. * @return {Array.<Vertex[]>} - An array of arrays of vertices. */ fluid.stronglyConnected = function (vertices, accessor) { var that = { stack: [], accessor: accessor, components: [], index: 0 }; vertices.forEach(function (vertex) { if (vertex.tarjanIndex === undefined) { fluid.stronglyConnectedOne(vertex, that); } }); return that.components; }; // Perform one round of the Tarjan search algorithm using the state structure generated in fluid.stronglyConnected fluid.stronglyConnectedOne = function (vertex, that) { vertex.tarjanIndex = that.index; vertex.lowIndex = that.index; ++that.index; that.stack.push(vertex); vertex.onStack = true; var outEdges = that.accessor(vertex); outEdges.forEach(function (outVertex) { if (outVertex.tarjanIndex === undefined) { // Successor has not yet been visited; recurse on it fluid.stronglyConnectedOne(outVertex, that); vertex.lowIndex = Math.min(vertex.lowIndex, outVertex.lowIndex); } else if (outVertex.onStack) { // Successor is on the stack and hence in the current component vertex.lowIndex = Math.min(vertex.lowIndex, outVertex.tarjanIndex); } }); // If vertex is a root node, pop the stack back as far as it and generate a component if (vertex.lowIndex === vertex.tarjanIndex) { var component = [], outVertex; do { outVertex = that.stack.pop(); outVertex.onStack = false; component.push(outVertex); } while (outVertex !== vertex); that.components.push(component); } }; /** MODEL COMPONENT HIERARCHY AND RELAY SYSTEM **/ fluid.initRelayModel = function (that) { fluid.deenlistModelComponent(that); return that.model; }; // TODO: This utility compensates for our lack of control over "wave of explosions" initialisation - we may // catch a model when it is apparently "completely initialised" and that's the best we can do, since we have // missed its own initial transaction fluid.isModelComplete = function (that) { return "model" in that && that.model !== fluid.inEvaluationMarker; }; // Enlist this model component as part of the "initial transaction" wave - note that "special transaction" init // is indexed by component, not by applier, and has special record type (complete + initModel), not transaction fluid.enlistModelComponent = function (that) { var instantiator = fluid.getInstantiator(that); var enlist = instantiator.modelTransactions.init[that.id]; if (!enlist) { enlist = { that: that, applier: fluid.getForComponent(that, "applier"), // required for FLUID-5504 even though currently unused complete: fluid.isModelComplete(that) }; instantiator.modelTransactions.init[that.id] = enlist; } return enlist; }; fluid.clearTransactions = function () { var instantiator = fluid.globalInstantiator; fluid.clear(instantiator.modelTransactions); instantiator.modelTransactions.init = {}; }; fluid.failureEvent.addListener(fluid.clearTransactions, "clearTransactions", "before:fail"); // Utility to coordinate with our crude "oscillation prevention system" which limits each link to 2 updates (presumably // in opposite directions). In the case of the initial transaction, we need to reset the count given that genuine // changes are arising in the system with each new enlisted model. TODO: if we ever get users operating their own // transactions, think of a way to incorporate this into that workflow fluid.clearLinkCounts = function (transRec, relaysAlso) { // TODO: Separate this record out into different types of records (relays are already in their own area) fluid.each(transRec, function (value, key) { if (typeof(value) === "number") { transRec[key] = 0; } else if (relaysAlso && value.options && typeof(value.relayCount) === "number") { value.relayCount = 0; } }); }; /** Compute relay dependency out arcs for a group of initialising components. * @param {Object} transacs - Hash of component id to local ChangeApplier transaction. * @param {Object} mrec - Hash of component id to enlisted component record. * @return {Object} - Hash of component id to list of enlisted component record. */ fluid.computeInitialOutArcs = function (transacs, mrec) { return fluid.transform(mrec, function (recel, id) { var oneOutArcs = {}; var listeners = recel.that.applier.listeners.sortedListeners; fluid.each(listeners, function (listener) { if (listener.isRelay && !fluid.isExcludedChangeSource(transacs[id], listener.cond)) { var targetId = listener.targetId; if (targetId !== id) { oneOutArcs[targetId] = true; } } }); var oneOutArcList = Object.keys(oneOutArcs); var togo = oneOutArcList.map(function (id) { return mrec[id]; }); // No edge if the component is not enlisted - it will sort to the end via "completeOnInit" fluid.remove_if(togo, function (rec) { return rec === undefined; }); return togo; }); }; fluid.sortCompleteLast = function (reca, recb) { return (reca.completeOnInit ? 1 : 0) - (recb.completeOnInit ? 1 : 0); }; /** Operate all coordinated transactions by bringing models to their respective initial values, and then commit them all * @param {Component} that - A representative component of the collection for which the initial transaction is to be operated * @param {Object} mrec - The global model transaction record for the init transaction. This is a hash indexed by component id * to a model transaction record, as registered in `fluid.enlistModelComponent`. This has members `that`, `applier`, `complete`. */ fluid.operateInitialTransaction = function (that, mrec) { var transId = fluid.allocateGuid(); var transRec = fluid.getModelTransactionRec(that, transId); var transac; var transacs = fluid.transform(mrec, function (recel) { transac = recel.that.applier.initiate(null, "init", transId); transRec[recel.that.applier.applierId] = {transaction: transac}; return transac; }); // TODO: This sort has very little effect in any current test (can be replaced by no-op - see FLUID-5339) - but // at least can't be performed in reverse order ("FLUID-3674 event coordination test" will fail) - need more cases // Compute the graph of init transaction relays for FLUID-6234 - one day we will have to do better than this, since there // may be finer structure than per-component - it may be that each piece of model area participates in this relation // differently. But this will require even more ambitious work such as fragmenting all the initial model values along // these boundaries. var outArcs = fluid.computeInitialOutArcs(transacs, mrec); var arcAccessor = function (mrec) { return outArcs[mrec.that.id]; }; var recs = fluid.values(mrec); var components = fluid.stronglyConnected(recs, arcAccessor); var priorityIndex = 0; components.forEach(function (component) { component.forEach(function (recel) { recel.initPriority = recel.completeOnInit ? Math.Infinity : priorityIndex++; }); }); recs.sort(function (reca, recb) { return reca.initPriority - recb.initPriority; }); recs.forEach(function (recel) { var that = recel.that; var transac = transacs[that.id]; if (recel.completeOnInit) { fluid.initModelEvent(that, that.applier, transac, that.applier.listeners.sortedListeners); } else { fluid.each(recel.initModels, function (initModel) { transac.fireChangeRequest({type: "ADD", segs: [], value: initModel}); fluid.clearLinkCounts(transRec, true); }); } var shadow = fluid.shadowForComponent(that); if (shadow) { // Fix for FLUID-5869 - the component may have been destroyed during its own init transaction shadow.modelComplete = true; // technically this is a little early, but this flag is only read in fluid.connectModelRelay } }); transac.commit(); // committing one representative transaction will commit them all }; // This modelComponent has now concluded initialisation - commit its initialisation transaction if it is the last such in the wave fluid.deenlistModelComponent = function (that) { var instantiator = fluid.getInstantiator(that); var mrec = instantiator.modelTransactions.init; Iif (!mrec[that.id]) { // avoid double evaluation through currently hacked "members" implementation return; } that.model = undefined; // Abuse of the ginger system - in fact it is "currently in evaluation" - we need to return a proper initial model value even if no init occurred yet mrec[that.id].complete = true; // flag means - "complete as in ready to participate in this transaction" var incomplete = fluid.find_if(mrec, function (recel) { return recel.complete !== true; }); if (!incomplete) { try { // For FLUID-6195 ensure that exceptions during init relay don't leave the framework unusable fluid.operateInitialTransaction(that, mrec); } catch (e) { fluid.clearTransactions(); throw e; } // NB: Don't call fluid.concludeTransaction since "init" is not a standard record - this occurs in commitRelays for the corresponding genuine record as usual instantiator.modelTransactions.init = {}; } }; fluid.parseModelReference = function (that, ref) { var parsed = fluid.parseContextReference(ref); parsed.segs = that.applier.parseEL(parsed.path); return parsed; }; /** Given a string which may represent a reference into a model, parses it into a structure holding the coordinates for resolving the reference. It specially * detects "references into model material" by looking for the first path segment in the path reference which holds the value "model". Some of its workflow is bypassed * in the special case of a reference representing an implicit model relay. In this case, ref will definitely be a String, and if it does not refer to model material, rather than * raising an error, the return structure will include a field <code>nonModel: true</code> * @param {Component} that - The component holding the reference * @param {String} name - A human-readable string representing the type of block holding the reference - e.g. "modelListeners" * @param {String|ModelReference} ref - The model reference to be parsed. This may have already been partially parsed at the original site - that is, a ModelReference is a * structure containing * segs: {String[]} An array of model path segments to be dereferenced in the target component (will become `modelSegs` in the final return) * context: {String} An IoC reference to the component holding the model * @param {Boolean} implicitRelay - <code>true</code> if the reference was being resolved for an implicit model relay - that is, * whether it occured within the `model` block itself. In this case, references to non-model material are not a failure and will simply be resolved * (by the caller) onto their targets (as constants). Otherwise, this function will issue a failure on discovering a reference to non-model material. * @return {Object} - A structure holding: * that {Component} The component whose model is the target of the reference. This may end up being constructed as part of the act of resolving the reference * applier {Component} The changeApplier for the component <code>that</code>. This may end up being constructed as part of the act of resolving the reference * modelSegs {String[]} An array of path segments into the model of the component * path {String} the value of <code>modelSegs</code> encoded as an EL path (remove client uses of this in time) * nonModel {Boolean} Set if <code>implicitRelay</code> was true and the reference was not into a model (modelSegs/path will not be set in this case) * segs {String[]} Holds the full array of path segments found by parsing the original reference - only useful in <code>nonModel</code> case */ fluid.parseValidModelReference = function (that, name, ref, implicitRelay) { var reject = function () { var failArgs = ["Error in " + name + ": ", ref].concat(fluid.makeArray(arguments)); fluid.fail.apply(null, failArgs); }; var rejectNonModel = function (value) { reject(" must be a reference to a component with a ChangeApplier (descended from fluid.modelComponent), instead got ", value); }; var parsed; // resolve ref into context and modelSegs if (typeof(ref) === "string") { if (fluid.isIoCReference(ref)) { parsed = fluid.parseModelReference(that, ref); var modelPoint = parsed.segs.indexOf("model"); if (modelPoint === -1) { Eif (implicitRelay) { parsed.nonModel = true; } else { reject(" must be a reference into a component model via a path including the segment \"model\""); } } else { parsed.modelSegs = parsed.segs.slice(modelPoint + 1); parsed.contextSegs = parsed.segs.slice(0, modelPoint); delete parsed.path; } } else { parsed = { path: ref, modelSegs: that.applier.parseEL(ref) }; } } else { Iif (!fluid.isArrayable(ref.segs)) { reject(" must contain an entry \"segs\" holding path segments referring a model path within a component"); } parsed = { context: ref.context, modelSegs: fluid.expandOptions(ref.segs, that) }; } var contextTarget, target; // resolve target component, which defaults to "that" if (parsed.context) { contextTarget = fluid.resolveContext(parsed.context, that); Iif (!contextTarget) { reject(" context must be a reference to an existing component"); } target = parsed.contextSegs ? fluid.getForComponent(contextTarget, parsed.contextSegs) : contextTarget; } else { target = that; } if (!parsed.nonModel) { if (!fluid.isComponent(target)) { rejectNonModel(target); } if (!target.applier) { fluid.getForComponent(target, ["applier"]); } if (!target.applier) { rejectNonModel(target); } } parsed.that = target; parsed.applier = target && target.applier; if (!parsed.path) { // ChangeToApplicable amongst others rely on this parsed.path = target && target.applier.composeSegments.apply(null, parsed.modelSegs); } return parsed; }; // Gets global record for a particular transaction id, allocating if necessary - looks up applier id to transaction, // as well as looking up source id (linkId in below) to count/true // Through poor implementation quality, not every access passes through this function - some look up instantiator.modelTransactions directly fluid.getModelTransactionRec = function (that, transId) { var instantiator = fluid.getInstantiator(that); Iif (!transId) { fluid.fail("Cannot get transaction record without transaction id"); } if (!instantiator) { return null; } var transRec = instantiator.modelTransactions[transId]; if (!transRec) { transRec = instantiator.modelTransactions[transId] = { relays: [], // sorted array of relay elements (also appear at top level index by transaction id) sources: {}, // hash of the global transaction sources (includes "init" but excludes "relay" and "local") externalChanges: {} // index by applierId to changePath to listener record }; } return transRec; }; fluid.recordChangeListener = function (component, applier, sourceListener, listenerId) { var shadow = fluid.shadowForComponent(component); fluid.recordListener(applier.modelChanged, sourceListener, shadow, listenerId); }; /** Called when a relay listener registered using `fluid.registerDirectChangeRelay` enlists in a transaction. Opens a local * representative of this transaction on `targetApplier`, creates and stores a "transaction element" within the global transaction * record keyed by the target applier's id. The transaction element is also pushed onto the `relays` member of the global transaction record - they * will be sorted by priority here when changes are fired. * @param {TransactionRecord} transRec - The global record for the current ChangeApplier transaction as retrieved from `fluid.getModelTransactionRec` * @param {ChangeApplier} targetApplier - The ChangeApplier to which outgoing changes will be applied. A local representative of the transaction will be opened on this applier and returned. * @param {String} transId - The global id of this transaction * @param {Object} options - The `options` argument supplied to `fluid.registerDirectChangeRelay`. This will be stored in the returned transaction element * - note that only the member `update` is ever used in `fluid.model.updateRelays` - TODO: We should thin this out * @param {Object} npOptions - Namespace and priority options * namespace {String} [optional] The namespace attached to this relay definition * priority {String} [optional] The (unparsed) priority attached to this relay definition * @return {Object} A "transaction element" holding information relevant to this relay's enlistment in the current transaction. This includes fields: * transaction {Transaction} The local representative of this transaction created on `targetApplier` * relayCount {Integer} The number of times this relay has been activated in this transaction * namespace {String} [optional] Namespace for this relay definition * priority {Priority} The parsed priority definition for this relay */ fluid.registerRelayTransaction = function (transRec, targetApplier, transId, options, npOptions) { var newTrans = targetApplier.initiate("relay", null, transId); // non-top-level transaction will defeat postCommit var transEl = transRec[targetApplier.applierId] = {transaction: newTrans, relayCount: 0, namespace: npOptions.namespace, priority: npOptions.priority, options: options}; transEl.priority = fluid.parsePriority(transEl.priority, transRec.relays.length, false, "model relay"); transRec.relays.push(transEl); return transEl; }; // Configure this parameter to tweak the number of relays the model will attempt per transaction before bailing out with an error fluid.relayRecursionBailout = 100; // Used with various arg combinations from different sources. For standard "implicit relay" or fully lensed relay, // the first 4 args will be set, and "options" will be empty // For a model-dependent relay, this will be used in two halves - firstly, all of the model // sources will bind to the relay transform document itself. In this case the argument "targetApplier" within "options" will be set. // In this case, the component known as "target" is really the source - it is a component reference discovered by parsing the // relay document. // Secondly, the relay itself will schedule an invalidation (as if receiving change to "*" of its source - which may in most // cases actually be empty) and play through its transducer. "Source" component itself is never empty, since it is used for listener // degistration on destruction (check this is correct for external model relay). However, "sourceSegs" may be empty in the case // there is no "source" component registered for the link. This change is played in a "half-transactional" way - that is, we wait // for all other changes in the system to settle before playing the relay document, in order to minimise the chances of multiple // firing and corruption. This is done via the "preCommit" hook registered at top level in establishModelRelay. This listener // is transactional but it does not require the transaction to conclude in order to fire - it may be reused as many times as // required within the "overall" transaction whilst genuine (external) changes continue to arrive. // TODO: Vast overcomplication and generation of closure garbage. SURELY we should be able to convert this into an externalised, arg-ist form /** Registers a listener operating one leg of a model relay relation, connecting the source and target. Called once or twice from `fluid.connectModelRelay` - * see the comment there for the three cases involved. Note that in its case iii)B) the applier to bind to is not the one attached to `target` but is instead * held in `options.targetApplier`. * @param {Object} target - The target component at the end of the relay. * @param {String[]} targetSegs - String segments representing the path in the target where outgoing changes are to be fired * @param {Component|null} source - The source component from where changes will be listened to. May be null if the change source is a relay document. * @param {String[]} sourceSegs - String segments representing the path in the source component's model at which changes will be listened to * @param {String} linkId - The unique id of this relay arc. This will be used as a key within the active transaction record to look up dynamic information about * activation of the link within that transaction (currently just an activation count) * @param {Function|null} transducer - A function which will be invoked when a change is to be relayed. This is one of the adapters constructed in "makeTransformPackage" * and is set in all cases other than iii)B) (collecting changes to contextualised relay). Note that this will have a member `cond` as returned from * `fluid.model.parseRelayCondition` encoding the condition whereby changes should be excluded from the transaction. The rule encoded by the condition * will be applied by the function within `transducer`. * @param {Object} options - * transactional {Boolean} `true` in case iii) - although this only represents `half-transactions`, `false` in others since these are resolved immediately with no granularity * targetApplier {ChangeApplier} [optional] in case iii)B) holds the applier for the contextualised relay document which outgoing changes should be applied to * sourceApplier {ChangeApplier} [optional] in case ii) holds the applier for the contextualised relay document on which we listen for outgoing changes * @param {Object} npOptions - Namespace and priority options * namespace {String} [optional] The namespace attached to this relay definition * priority {String} [optional] The (unparsed) priority attached to this relay definition */ fluid.registerDirectChangeRelay = function (target, targetSegs, source, sourceSegs, linkId, transducer, options, npOptions) { var targetApplier = options.targetApplier || target.applier; // first branch implies the target is a relay document var sourceApplier = options.sourceApplier || source.applier; // first branch implies the source is a relay document - listener will be transactional var applierId = targetApplier.applierId; targetSegs = fluid.makeArray(targetSegs); sourceSegs = fluid.makeArray(sourceSegs); // take copies since originals will be trashed var sourceListener = function (newValue, oldValue, path, changeRequest, trans, applier) { var transId = trans.id; var transRec = fluid.getModelTransactionRec(target, transId); if (applier && trans && !transRec[applier.applierId]) { // don't trash existing record which may contain "options" (FLUID-5397) transRec[applier.applierId] = {transaction: trans}; // enlist the outer user's original transaction } var existing = transRec[applierId]; transRec[linkId] = transRec[linkId] || 0; // Crude "oscillation prevention" system limits each link to maximum of 2 operations per cycle (presumably in opposite directions) var relay = true; // TODO: See FLUID-5303 - we currently disable this check entirely to solve FLUID-5293 - perhaps we might remove link counts entirely Eif (relay) { ++transRec[linkId]; if (transRec[linkId] > fluid.relayRecursionBailout) { fluid.fail("Error in model relay specification at component ", target, " - operated more than " + fluid.relayRecursionBailout + " relays without model value settling - current model contents are ", trans.newHolder.model); } if (!existing) { existing = fluid.registerRelayTransaction(transRec, targetApplier, transId, options, npOptions); } if (transducer && !options.targetApplier) { // TODO: This is just for safety but is still unusual and now abused. The transducer doesn't need the "newValue" since all the transform information // has been baked into the transform document itself. However, we now rely on this special signalling value to make sure we regenerate transforms in // the "forwardAdapter" transducer(existing.transaction, options.sourceApplier ? undefined : newValue, sourceSegs, targetSegs, changeRequest); } else { if (changeRequest && changeRequest.type === "DELETE") { existing.transaction.fireChangeRequest({type: "DELETE", segs: targetSegs}); } if (newValue !== undefined) { existing.transaction.fireChangeRequest({type: "ADD", segs: targetSegs, value: newValue}); } } } }; var spec = sourceApplier.modelChanged.addListener({ isRelay: true, cond: transducer && transducer.cond, targetId: target.id, // these two fields for debuggability targetApplierId: targetApplier.id, segs: sourceSegs, transactional: options.transactional }, sourceListener); if (fluid.passLogLevel(fluid.logLevel.TRACE)) { fluid.log(fluid.logLevel.TRACE, "Adding relay listener with listenerId " + spec.listenerId + " to source applier with id " + sourceApplier.applierId + " from target applier with id " + applierId + " for target component with id " + target.id); } Eif (source) { // TODO - we actually may require to register on THREE sources in the case modelRelay is attached to a // component which is neither source nor target. Note there will be problems if source, say, is destroyed and recreated, // and holder is not - relay will in that case be lost. Need to integrate relay expressions with IoCSS. fluid.recordChangeListener(source, sourceApplier, sourceListener, spec.listenerId); if (target !== source) { fluid.recordChangeListener(target, sourceApplier, sourceListener, spec.listenerId); } } }; /** Connect a model relay relation between model material. This is called in three scenarios: * i) from `fluid.parseModelRelay` when parsing an uncontextualised model relay (one with a static transform document), to * directly connect the source and target of the relay * ii) from `fluid.parseModelRelay` when parsing a contextualised model relay (one whose transform document depends on other model * material), to connect updates emitted from the transform document's applier onto the relay ends (both source and target) * iii) from `fluid.parseImplicitRelay` when parsing model references found within contextualised model relay to bind changes emitted * from the target of the reference onto the transform document's applier. These may apply directly to another component's model (in its case * A) or apply to a relay document (in its case B) * * This function will make one or two calls to `fluid.registerDirectChangeRelay` in order to set up each leg of any required relay. * Note that in case iii)B) the component referred to as our argument `target` is actually the "source" of the changes (that is, the one encountered * while traversing the transform document), and our argument `source` is the component holding the transform, and so * the call to `fluid.registerDirectChangeRelay` will have `source` and `target` reversed (`fluid.registerDirectChangeRelay` will bind to the `targetApplier` * in the options rather than source's applier). * @param {Component} source - The component holding the material giving rise to the relay, or the one referred to by the `source` member * of the configuration in case ii), if there is one * @param {Array|null} sourceSegs - An array of parsed string segments of the `source` relay reference in case i), or the offset into the transform * document of the reference component in case iii), otherwise `null` (case ii)) * @param {Component} target - The component holding the model relay `target` in cases i) and ii), or the component at the other end of * the model reference in case iii) (in this case in fact a "source" for the changes. * @param {Array} targetSegs - An array of parsed string segments of the `target` reference in cases i) and ii), or of the model reference in * case iii) * @param {Object} options - A structure describing the relay, allowing discrimination of the various cases above. This is derived from the return from * `fluid.makeTransformPackage` but will have some members filtered in different cases. This contains members: * update {Function} A function to be called at the end of a "half-transaction" when all pending updates have been applied to the document's applier. * This discriminates case iii) * targetApplier {ChangeApplier} The ChangeApplier for the relay document, in case iii)B) * forwardApplier (ChangeApplier} The ChangeApplier for the relay document, in cases ii) and iii)B) (only used in latter case) * forwardAdapter {Adapter} A function accepting (transaction, newValue) to pass through the forward leg of the relay. Contains a member `cond` holding the parsed relay condition. * backwardAdapter {Adapter} A function accepting (transaction, newValue) to pass through the backward leg of the relay. Contains a member `cond` holding the parsed relay condition. * namespace {String} Namespace for any relay definition * priority {String} Priority for any relay definition or synthetic "first" for iii)A) */ fluid.connectModelRelay = function (source, sourceSegs, target, targetSegs, options) { var linkId = fluid.allocateGuid(); function enlistComponent(component) { var enlist = fluid.enlistModelComponent(component); if (enlist.complete) { var shadow = fluid.shadowForComponent(component); if (shadow.modelComplete) { enlist.completeOnInit = true; } } } enlistComponent(target); enlistComponent(source); // role of "source" and "target" are swapped in case iii)B) var npOptions = fluid.filterKeys(options, ["namespace", "priority"]); if (options.update) { // it is a call for a relay document - ii) or iii)B) if (options.targetApplier) { // case iii)B) // We are in the middle of parsing a contextualised relay, and this call has arrived via its parseImplicitRelay. // register changes from the target model onto changes to the model relay document fluid.registerDirectChangeRelay(source, sourceSegs, target, targetSegs, linkId, null, { transactional: false, targetApplier: options.targetApplier, update: options.update }, npOptions); } else { // case ii), contextualised relay overall output // Rather than bind source-source, instead register the "half-transactional" listener which binds changes // from the relay document itself onto the target fluid.registerDirectChangeRelay(target, targetSegs, source, [], linkId + "-transform", options.forwardAdapter, {transactional: true, sourceApplier: options.forwardApplier}, npOptions); } } else { // case i) or iii)A): more efficient, old-fashioned branch where relay is uncontextualised fluid.registerDirectChangeRelay(target, targetSegs, source, sourceSegs, linkId, options.forwardAdapter, {transactional: false}, npOptions); fluid.registerDirectChangeRelay(source, sourceSegs, target, targetSegs, linkId, options.backwardAdapter, {transactional: false}, npOptions); } }; fluid.parseSourceExclusionSpec = function (targetSpec, sourceSpec) { targetSpec.excludeSource = fluid.arrayToHash(fluid.makeArray(sourceSpec.excludeSource || (sourceSpec.includeSource ? "*" : undefined))); targetSpec.includeSource = fluid.arrayToHash(fluid.makeArray(sourceSpec.includeSource)); return targetSpec; }; /** Determines whether the supplied transaction should have changes not propagated into it as a result of being excluded by a * condition specification. * @param {Transaction} transaction - A local ChangeApplier transaction, with member `fullSources` holding all currently active sources * @param {ConditionSpec} spec - A parsed relay condition specification, as returned from `fluid.model.parseRelayCondition`. * @return {Boolean} `true` if changes should be excluded from the supplied transaction according to the supplied specification */ fluid.isExcludedChangeSource = function (transaction, spec) { if (!spec || !spec.excludeSource) { // mergeModelListeners initModelEvent fabricates a fake spec that bypasses processing return false; } var excluded = spec.excludeSource["*"]; for (var source in transaction.fullSources) { if (spec.excludeSource[source]) { excluded = true; } if (spec.includeSource[source]) { excluded = false; } } return excluded; }; fluid.model.guardedAdapter = function (transaction, cond, func, args) { if (!fluid.isExcludedChangeSource(transaction, cond) && func !== fluid.model.transform.uninvertibleTransform) { func.apply(null, args); } }; // TODO: This rather crummy function is the only site with a hard use of "path" as String fluid.transformToAdapter = function (transform, targetPath) { var basedTransform = {}; basedTransform[targetPath] = transform; // TODO: Faulty with respect to escaping rules return function (trans, newValue, sourceSegs, targetSegs, changeRequest) { if (changeRequest && changeRequest.type === "DELETE") { trans.fireChangeRequest({type: "DELETE", path: targetPath}); // avoid mouse droppings in target document for FLUID-5585 } // TODO: More efficient model that can only run invalidated portion of transform (need to access changeMap of source transaction) fluid.model.transformWithRules(newValue, basedTransform, {finalApplier: trans}); }; }; // TODO: sourcePath and targetPath should really be converted to segs to avoid excess work in parseValidModelReference fluid.makeTransformPackage = function (componentThat, transform, sourcePath, targetPath, forwardCond, backwardCond, namespace, priority) { var that = { forwardHolder: {model: transform}, backwardHolder: {model: null} }; that.generateAdapters = function (trans) { // can't commit "half-transaction" or events will fire - violate encapsulation in this way that.forwardAdapterImpl = fluid.transformToAdapter(trans ? trans.newHolder.model : that.forwardHolder.model, targetPath); if (sourcePath !== null) { var inverted = fluid.model.transform.invertConfiguration(transform); if (inverted !== fluid.model.transform.uninvertibleTransform) { that.backwardHolder.model = inverted; that.backwardAdapterImpl = fluid.transformToAdapter(that.backwardHolder.model, sourcePath); } else { that.backwardAdapterImpl = inverted; } } }; that.forwardAdapter = function (transaction, newValue) { // create a stable function reference for this possibly changing adapter if (newValue === undefined) { that.generateAdapters(); // TODO: Quick fix for incorrect scheduling of invalidation/transducing // "it so happens" that fluid.registerDirectChangeRelay invokes us with empty newValue in the case of invalidation -> transduction } fluid.model.guardedAdapter(transaction, forwardCond, that.forwardAdapterImpl, arguments); }; that.forwardAdapter.cond = forwardCond; // Used when parsing graph in init transaction // fired from fluid.model.updateRelays via invalidator event that.runTransform = function (trans) { trans.commit(); // this will reach the special "half-transactional listener" registered in fluid.connectModelRelay, // branch with options.targetApplier - by committing the transaction, we update the relay document in bulk and then cause // it to execute (via "transducer") trans.reset(); }; that.forwardApplier = fluid.makeHolderChangeApplier(that.forwardHolder); that.forwardApplier.isRelayApplier = true; // special annotation so these can be discovered in the transaction record that.invalidator = fluid.makeEventFirer({name: "Invalidator for model relay with applier " + that.forwardApplier.applierId}); if (sourcePath !== null) { // TODO: backwardApplier is unused that.backwardApplier = fluid.makeHolderChangeApplier(that.backwardHolder); that.backwardAdapter = function (transaction) { fluid.model.guardedAdapter(transaction, backwardCond, that.backwardAdapterImpl, arguments); }; that.backwardAdapter.cond = backwardCond; } that.update = that.invalidator.fire; // necessary so that both routes to fluid.connectModelRelay from here hit the first branch var implicitOptions = { targetApplier: that.forwardApplier, // this special field identifies us to fluid.connectModelRelay update: that.update, namespace: namespace, priority: priority, refCount: 0 }; that.forwardHolder.model = fluid.parseImplicitRelay(componentThat, transform, [], implicitOptions); that.refCount = implicitOptions.refCount; that.namespace = namespace; that.priority = priority; that.generateAdapters(); that.invalidator.addListener(that.generateAdapters); that.invalidator.addListener(that.runTransform); return that; }; fluid.singleTransformToFull = function (singleTransform) { var withPath = $.extend(true, {inputPath: ""}, singleTransform); return { "": { transform: withPath } }; }; // Convert old-style "relay conditions" to source includes/excludes as used in model listeners fluid.model.relayConditions = { initOnly: {includeSource: "init"}, liveOnly: {excludeSource: "init"}, never: {includeSource: []}, always: {} }; /** Parse a relay condition specification, e.g. of the form `{includeSource: "init"}` or `never` into a hash representation * suitable for rapid querying. * @param {String|Object} condition - A relay condition specification, appearing in the section `forward` or `backward` of a * relay definition * @return {RelayCondition} The parsed condition, holding members `includeSource` and `excludeSource` each with a hash to `true` * of referenced sources */ fluid.model.parseRelayCondition = function (condition) { Iif (condition === "initOnly") { fluid.log(fluid.logLevel.WARN, "The relay condition \"initOnly\" is deprecated: Please use the form 'includeSource: \"init\"' instead"); } else if (condition === "liveOnly") { fluid.log(fluid.logLevel.WARN, "The relay condition \"liveOnly\" is deprecated: Please use the form 'excludeSource: \"init\"' instead"); } var exclusionRec; if (!condition) { exclusionRec = {}; } else if (typeof(condition) === "string") { exclusionRec = fluid.model.relayConditions[condition]; Iif (!exclusionRec) { fluid.fail("Unrecognised model relay condition string \"" + condition + "\": the supported values are \"never\" or a record with members \"includeSource\" and/or \"excludeSource\""); } } else { exclusionRec = condition; } return fluid.parseSourceExclusionSpec({}, exclusionRec); }; /** Parse a single model relay record as appearing nested within the `modelRelay` block in a model component's * options. By various calls to `fluid.connectModelRelay` this will set up the structure operating the live * relay during the component#s lifetime. * @param {Component} that - The component holding the record, currently instantiating * @param {Object} mrrec - The model relay record. This must contain either a member `singleTransform` or `transform` and may also contain * members `namespace`, `path`, `priority`, `forward` and `backward` * @param {String} key - */ fluid.parseModelRelay = function (that, mrrec, key) { var parsedSource = mrrec.source !== undefined ? fluid.parseValidModelReference(that, "modelRelay record member \"source\"", mrrec.source) : {path: null, modelSegs: null}; var parsedTarget = fluid.parseValidModelReference(that, "modelRelay record member \"target\"", mrrec.target); var namespace = mrrec.namespace || key; var transform = mrrec.singleTransform ? fluid.singleTransformToFull(mrrec.singleTransform) : mrrec.transform; Iif (!transform) { fluid.fail("Cannot parse modelRelay record without element \"singleTransform\" or \"transform\":", mrrec); } var forwardCond = fluid.model.parseRelayCondition(mrrec.forward), backwardCond = fluid.model.parseRelayCondition(mrrec.backward); var transformPackage = fluid.makeTransformPackage(that, transform, parsedSource.path, parsedTarget.path, forwardCond, backwardCond, namespace, mrrec.priority); if (transformPackage.refCount === 0) { // There were no implicit relay elements found in the relay document - it can be relayed directly // Case i): Bind changes emitted from the relay ends to each other, synchronously fluid.connectModelRelay(parsedSource.that || that, parsedSource.modelSegs, parsedTarget.that, parsedTarget.modelSegs, // Primarily, here, we want to get rid of "update" which is what signals to connectModelRelay that this is a invalidatable relay fluid.filterKeys(transformPackage, ["forwardAdapter", "backwardAdapter", "namespace", "priority"])); } else { if (parsedSource.modelSegs) { fluid.fail("Error in model relay definition: If a relay transform has a model dependency, you can not specify a \"source\" entry - please instead enter this as \"input\" in the transform specification. Definition was ", mrrec, " for component ", that); } // Case ii): Binds changes emitted from the relay document itself onto the relay ends (using the "half-transactional system") fluid.connectModelRelay(that, null, parsedTarget.that, parsedTarget.modelSegs, transformPackage); } }; /** Traverses a model document written within a component's options, parsing any IoC references looking for * i) references to general material, which will be fetched and interpolated now, and ii) "implicit relay" references to the * model areas of other components, which will be used to set up live synchronisation between the area in this component where * they appear and their target, as well as setting up initial synchronisation to compute the initial contents. * This is called in two situations: A) parsing the `model` configuration option for a model component, and B) parsing the * `transform` member (perhaps derived from `singleTransform`) of a `modelRelay` block for a model component. It calls itself * recursively as it progresses through the model document material with updated `segs` * @param {Component} that - The component holding the model document * @param {Any} modelRec - The model document specification to be parsed * @param {String[]} segs - The array of string path segments from the root of the entire model document to the point of current parsing * @param {Object} options - Configuration options (mutable) governing this parse. This is primarily used to hand as the 5th argument to * `fluid.connectModelRelay` for any model references found, and contains members * refCount {Integer} An count incremented for every call to `fluid.connectModelRelay` setting up a synchronizing relay for every * reference to model material encountered * priority {String} The unparsed priority member attached to this record, or `first` for a parse of `model` (case A) * namespace {String} [optional] A namespace attached to this transform, if we are parsing a transform * targetApplier {ChangeApplier} [optional] The ChangeApplier for this transform document, if it is a transform, empty otherwise * update {Function} [optional] A function to be called on conclusion of a "half-transaction" where all currently pending updates have been applied * to this transform document. This function will update/regenerate the relay transform functions used to relay changes between the transform * ends based on the updated document. * @return {Any} - The resulting model value. */ fluid.parseImplicitRelay = function (that, modelRec, segs, options) { var value; if (fluid.isIoCReference(modelRec)) { var parsed = fluid.parseValidModelReference(that, "model reference from model (implicit relay)", modelRec, true); if (parsed.nonModel) { value = fluid.getForComponent(parsed.that, parsed.segs); } else { ++options.refCount; // This count is used from within fluid.makeTransformPackage fluid.connectModelRelay(that, segs, parsed.that, parsed.modelSegs, options); } } else if (fluid.isPrimitive(modelRec) || !fluid.isPlainObject(modelRec)) { value = modelRec; } else if (modelRec.expander && fluid.isPlainObject(modelRec.expander)) { value = fluid.expandOptions(modelRec, that); } else { value = fluid.freshContainer(modelRec); fluid.each(modelRec, function (innerValue, key) { segs.push(key); var innerTrans = fluid.parseImplicitRelay(that, innerValue, segs, options); if (innerTrans !== undefined) { value[key] = innerTrans; } segs.pop(); }); } return value; }; // Conclude the transaction by firing to all external listeners in priority order fluid.model.notifyExternal = function (transRec) { var allChanges = transRec ? fluid.values(transRec.externalChanges) : []; fluid.sortByPriority(allChanges); for (var i = 0; i < allChanges.length; ++i) { var change = allChanges[i]; var targetApplier = change.args[5]; // NOTE: This argument gets here via fluid.model.storeExternalChange from fluid.notifyModelChanges if (!targetApplier.destroyed) { // 3rd point of guarding for FLUID-5592 change.listener.apply(null, change.args); } } fluid.clearLinkCounts(transRec, true); // "options" structures for relayCount are aliased }; fluid.model.commitRelays = function (instantiator, transactionId) { var transRec = instantiator.modelTransactions[transactionId]; fluid.each(transRec, function (transEl) { // EXPLAIN: This must commit ALL current transactions, not just those for relays - why? if (transEl.transaction) { // some entries are links transEl.transaction.commit("relay"); transEl.transaction.reset(); } }); }; // Listens to all invalidation to relays, and reruns/applies them if they have been invalidated fluid.model.updateRelays = function (instantiator, transactionId) { var transRec = instantiator.modelTransactions[transactionId]; var updates = 0; fluid.sortByPriority(transRec.relays); fluid.each(transRec.relays, function (transEl) { // TODO: We have a bit of a problem here in that we only process updatable relays by priority - plain relays get to act non-transactionally if (transEl.transaction.changeRecord.changes > 0 && transEl.relayCount < 2 && transEl.options.update) { transEl.relayCount++; fluid.clearLinkCounts(transRec); transEl.options.update(transEl.transaction, transRec); ++updates; } }); return updates; }; fluid.establishModelRelay = function (that, optionsModel, optionsML, optionsMR, applier) { var shadow = fluid.shadowForComponent(that); Eif (!shadow.modelRelayEstablished) { shadow.modelRelayEstablished = true; } else { fluid.fail("FLUID-5887 failure: Model relay initialised twice on component", that); } fluid.mergeModelListeners(that, optionsML); var enlist = fluid.enlistModelComponent(that); fluid.each(optionsMR, function (mrrec, key) { for (var i = 0; i < mrrec.length; ++i) { fluid.parseModelRelay(that, mrrec[i], key); } }); // Note: this particular instance of "refCount" is disused. We only use the count made within fluid.makeTransformPackge var initModels = fluid.transform(optionsModel, function (modelRec) { return fluid.parseImplicitRelay(that, modelRec, [], {refCount: 0, priority: "first"}); }); enlist.initModels = initModels; var instantiator = fluid.getInstantiator(that); function updateRelays(transaction) { while (fluid.model.updateRelays(instantiator, transaction.id) > 0) {} // eslint-disable-line no-empty } function commitRelays(transaction, applier, code) { if (code !== "relay") { // don't commit relays if this commit is already a relay commit fluid.model.commitRelays(instantiator, transaction.id); } } function concludeTransaction(transaction, applier, code) { if (code !== "relay") { fluid.model.notifyExternal(instantiator.modelTransactions[transaction.id]); delete instantiator.modelTransactions[transaction.id]; } } applier.preCommit.addListener(updateRelays); applier.preCommit.addListener(commitRelays); applier.postCommit.addListener(concludeTransaction); return null; }; // supported, PUBLIC API grade fluid.defaults("fluid.modelComponent", { gradeNames: ["fluid.component"], changeApplierOptions: { relayStyle: true, cullUnchanged: true }, members: { model: "@expand:fluid.initRelayModel({that}, {that}.modelRelay)", applier: "@expand:fluid.makeHolderChangeApplier({that}, {that}.options.changeApplierOptions)", modelRelay: "@expand:fluid.establishModelRelay({that}, {that}.options.model, {that}.options.modelListeners, {that}.options.modelRelay, {that}.applier)" }, mergePolicy: { model: { noexpand: true, func: fluid.arrayConcatPolicy // TODO: bug here in case a model consists of an array }, modelListeners: fluid.makeMergeListenersPolicy(fluid.arrayConcatPolicy), modelRelay: fluid.makeMergeListenersPolicy(fluid.arrayConcatPolicy, true) } }); fluid.modelChangedToChange = function (args) { return { value: args[0], oldValue: args[1], path: args[2], transaction: args[4] }; }; // Note - has only one call, from resolveModelListener fluid.event.invokeListener = function (listener, args, localRecord, mergeRecord) { if (typeof(listener) === "string") { listener = fluid.event.resolveListener(listener); // just resolves globals } return listener.apply(null, args, localRecord, mergeRecord); // can be "false apply" that requires extra context for expansion }; fluid.resolveModelListener = function (that, record) { var togo = function () { Iif (fluid.isDestroyed(that)) { // first guarding point to resolve FLUID-5592 return; } var change = fluid.modelChangedToChange(arguments); var args = arguments; var localRecord = {change: change, "arguments": args}; var mergeRecord = {source: Object.keys(change.transaction.sources)}; // cascade for FLUID-5490 if (record.args) { args = fluid.expandOptions(record.args, that, {}, localRecord); } fluid.event.invokeListener(record.listener, fluid.makeArray(args), localRecord, mergeRecord); }; fluid.event.impersonateListener(record.listener, togo); return togo; }; fluid.registerModelListeners = function (that, record, paths, namespace) { var func = fluid.resolveModelListener(that, record); fluid.each(record.byTarget, function (parsedArray) { var parsed = parsedArray[0]; // that, applier are common across all these elements var spec = { listener: func, // for initModelEvent listenerId: fluid.allocateGuid(), // external declarative listeners may often share listener handle, identify here segsArray: fluid.getMembers(parsedArray, "modelSegs"), pathArray: fluid.getMembers(parsedArray, "path"), includeSource: record.includeSource, excludeSource: record.excludeSource, priority: fluid.expandOptions(record.priority, that), transactional: true }; // update "spec" so that we parse priority information just once spec = parsed.applier.modelChanged.addListener(spec, func, namespace, record.softNamespace); fluid.recordChangeListener(that, parsed.applier, func, spec.listenerId); function initModelEvent() { if (fluid.isModelComplete(parsed.that)) { var trans = parsed.applier.initiate(null, "init"); fluid.initModelEvent(that, parsed.applier, trans, [spec]); trans.commit(); } } if (that !== parsed.that && !fluid.isModelComplete(that)) { // TODO: Use FLUID-4883 "latched events" when available // Don't confuse the end user by firing their listener before the component is constructed // TODO: Better detection than this is requred - we assume that the target component will not be discovered as part // of the initial transaction wave, but if it is, it will get a double notification - we really need "wave of explosions" // since we are currently too early in initialisation of THIS component in order to tell if other will be found // independently. var onCreate = fluid.getForComponent(that, ["events", "onCreate"]); onCreate.addListener(initModelEvent); } }); }; fluid.mergeModelListeners = function (that, listeners) { fluid.each(listeners, function (value, key) { Iif (typeof(value) === "string") { value = { funcName: value }; } // Bypass fluid.event.dispatchListener by means of "standard = false" and enter our custom workflow including expanding "change": var records = fluid.event.resolveListenerRecord(value, that, "modelListeners", null, false).records; fluid.each(records, function (record) { // Aggregate model listeners into groups referring to the same component target. // We do this so that a single entry will appear in its modelListeners so that they may // be notified just once per transaction, and also displaced by namespace record.byTarget = {}; var paths = fluid.makeArray(record.path === undefined ? key : record.path); fluid.each(paths, function (path) { var parsed = fluid.parseValidModelReference(that, "modelListeners entry", path); fluid.pushArray(record.byTarget, parsed.that.id, parsed); }); var namespace = (record.namespace && !record.softNamespace ? record.namespace : null) || (record.path !== undefined ? key : null); fluid.registerModelListeners(that, record, paths, namespace); }); }); }; /** CHANGE APPLIER **/ /* Dispatches a list of changes to the supplied applier */ fluid.fireChanges = function (applier, changes) { for (var i = 0; i < changes.length; ++i) { applier.fireChangeRequest(changes[i]); } }; fluid.model.isChangedPath = function (changeMap, segs) { for (var i = 0; i <= segs.length; ++i) { if (typeof(changeMap) === "string") { return true; } if (i < segs.length && changeMap) { changeMap = changeMap[segs[i]]; } } return false; }; fluid.model.setChangedPath = function (options, segs, value) { var notePath = function (record) { segs.unshift(record); fluid.model.setSimple(options, segs, value); segs.shift(); }; if (!fluid.model.isChangedPath(options.changeMap, segs)) { ++options.changes; notePath("changeMap"); } if (!fluid.model.isChangedPath(options.deltaMap, segs)) { ++options.deltas; notePath("deltaMap"); } }; fluid.model.fetchChangeChildren = function (target, i, segs, source, options) { fluid.each(source, function (value, key) { segs[i] = key; fluid.model.applyChangeStrategy(target, key, i, segs, value, options); segs.length = i; }); }; // Called with two primitives which are compared for equality. This takes account of "floating point slop" to avoid // continuing to propagate inverted values as changes // TODO: replace with a pluggable implementation fluid.model.isSameValue = function (a, b) { if (typeof(a) !== "number" || typeof(b) !== "number") { return a === b; } else { // Don't use isNaN because of https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/isNaN#Confusing_special-case_behavior if (a === b || a !== a && b !== b) { // Either the same concrete number or both NaN return true; } else { var relError = Math.abs((a - b) / b); return relError < 1e-12; // 64-bit floats have approx 16 digits accuracy, this should deal with most reasonable transforms } } }; fluid.model.applyChangeStrategy = function (target, name, i, segs, source, options) { var targetSlot = target[name]; var sourceCode = fluid.typeCode(source); var targetCode = fluid.typeCode(targetSlot); var changedValue = fluid.NO_VALUE; if (sourceCode === "primitive") { if (!fluid.model.isSameValue(targetSlot, source)) { changedValue = source; ++options.unchanged; } } else if (targetCode !== sourceCode || sourceCode === "array" && source.length !== targetSlot.length) { // RH is not primitive - array or object and mismatching or any array rewrite changedValue = fluid.freshContainer(source); } if (changedValue !== fluid.NO_VALUE) { target[name] = changedValue; if (options.changeMap) { fluid.model.setChangedPath(options, segs, options.inverse ? "DELETE" : "ADD"); } } if (sourceCode !== "primitive") { fluid.model.fetchChangeChildren(target[name], i + 1, segs, source, options); } }; fluid.model.stepTargetAccess = function (target, type, segs, startpos, endpos, options) { for (var i = startpos; i < endpos; ++i) { if (!target) { continue; } var oldTrunk = target[segs[i]]; target = fluid.model.traverseWithStrategy(target, segs, i, options[type === "ADD" ? "resolverSetConfig" : "resolverGetConfig"], segs.length - i - 1); if (oldTrunk !== target && options.changeMap) { fluid.model.setChangedPath(options, segs.slice(0, i + 1), "ADD"); } } return {root: target, last: segs[endpos]}; }; fluid.model.defaultAccessorConfig = function (options) { options = options || {}; options.resolverSetConfig = options.resolverSetConfig || fluid.model.escapedSetConfig; options.resolverGetConfig = options.resolverGetConfig || fluid.model.escapedGetConfig; return options; }; // Changes: "MERGE" action abolished // ADD/DELETE at root can be destructive // changes tracked in optional final argument holding "changeMap: {}, changes: 0, unchanged: 0" fluid.model.applyHolderChangeRequest = function (holder, request, options) { options = fluid.model.defaultAccessorConfig(options); options.deltaMap = options.changeMap ? {} : null; options.deltas = 0; var length = request.segs.length; var pen, atRoot = length === 0; if (atRoot) { pen = {root: holder, last: "model"}; } else { if (!holder.model) { holder.model = {}; fluid.model.setChangedPath(options, [], options.inverse ? "DELETE" : "ADD"); } pen = fluid.model.stepTargetAccess(holder.model, request.type, request.segs, 0, length - 1, options); } if (request.type === "ADD") { var value = request.value; var segs = fluid.makeArray(request.segs); fluid.model.applyChangeStrategy(pen.root, pen.last, length - 1, segs, value, options, atRoot); } else Eif (request.type === "DELETE") { if (pen.root && pen.root[pen.last] !== undefined) { delete pen.root[pen.last]; Eif (options.changeMap) { fluid.model.setChangedPath(options, request.segs, "DELETE"); } } } else { fluid.fail("Unrecognised change type of " + request.type); } return options.deltas ? options.deltaMap : null; }; /** Compare two models for equality using a deep algorithm. It is assumed that both models are JSON-equivalent and do * not contain circular links. * @param modela The first model to be compared * @param modelb The second model to be compared * @param {Object} options - If supplied, will receive a map and summary of the change content between the objects. Structure is: * changeMap: {Object/String} An isomorphic map of the object structures to values "ADD" or "DELETE" indicating * that values have been added/removed at that location. Note that in the case the object structure differs at the root, <code>changeMap</code> will hold * the plain String value "ADD" or "DELETE" * changes: {Integer} Counts the number of changes between the objects - The two objects are identical iff <code>changes === 0</code>. * unchanged: {Integer} Counts the number of leaf (primitive) values at which the two objects are identical. Note that the current implementation will * double-count, this summary should be considered indicative rather than precise. * @return <code>true</code> if the models are identical */ // TODO: This algorithm is quite inefficient in that both models will be copied once each // supported, PUBLIC API function fluid.model.diff = function (modela, modelb, options) { options = options || {changes: 0, unchanged: 0, changeMap: {}}; // current algorithm can't avoid the expense of changeMap var typea = fluid.typeCode(modela); var typeb = fluid.typeCode(modelb); var togo; if (typea === "primitive" && typeb === "primitive") { togo = fluid.model.isSameValue(modela, modelb); } else if (typea === "primitive" ^ typeb === "primitive") { togo = false; } else { // Apply both forward and reverse changes - if no changes either way, models are identical // "ADD" reported in the reverse direction must be accounted as a "DELETE" var holdera = { model: fluid.copy(modela) }; fluid.model.applyHolderChangeRequest(holdera, {value: modelb, segs: [], type: "ADD"}, options); var holderb = { model: fluid.copy(modelb) }; options.inverse = true; fluid.model.applyHolderChangeRequest(holderb, {value: modela, segs: [], type: "ADD"}, options); togo = options.changes === 0; } if (togo === false && options.changes === 0) { // catch all primitive cases options.changes = 1; options.changeMap = modelb === undefined ? "DELETE" : "ADD"; } else if (togo === true && options.unchanged === 0) { options.unchanged = 1; } return togo; }; fluid.outputMatches = function (matches, outSegs, root) { fluid.each(root, function (value, key) { matches.push(outSegs.concat(key)); }); }; // Here we only support for now very simple expressions which have at most one // wildcard which must appear in the final segment fluid.matchChanges = function (changeMap, specSegs, newHolder, oldHolder) { var newRoot = newHolder.model; var oldRoot = oldHolder.model; var map = changeMap; var outSegs = ["model"]; var wildcard = false; var togo = []; for (var i = 0; i < specSegs.length; ++i) { var seg = specSegs[i]; if (seg === "*") { Eif (i === specSegs.length - 1) { wildcard = true; } else { fluid.fail("Wildcard specification in modelChanged listener is only supported for the final path segment: " + specSegs.join(".")); } } else { outSegs.push(seg); map = fluid.isPrimitive(map) ? map : map[seg]; newRoot = newRoot ? newRoot[seg] : undefined; oldRoot = oldRoot ? oldRoot[seg] : undefined; } } if (map) { if (wildcard) { if (map === "DELETE") { fluid.outputMatches(togo, outSegs, oldRoot); } else if (map === "ADD") { fluid.outputMatches(togo, outSegs, newRoot); } else { fluid.outputMatches(togo, outSegs, map); } } else { togo.push(outSegs); } } return togo; }; fluid.storeExternalChange = function (transRec, applier, invalidPath, spec, args) { var pathString = applier.composeSegments.apply(null, invalidPath); var keySegs = [applier.holder.id, spec.listenerId, (spec.wildcard ? pathString : "")]; var keyString = keySegs.join("|"); // TODO: We think we probably have a bug in that notifications destined for end of transaction are actually continuously emitted during the transaction // These are unbottled in fluid.concludeTransaction transRec.externalChanges[keyString] = {listener: spec.listener, namespace: spec.namespace, priority: spec.priority, args: args}; }; fluid.notifyModelChanges = function (listeners, changeMap, newHolder, oldHolder, changeRequest, transaction, applier, that) { if (!listeners) { return; } var transRec = transaction && fluid.getModelTransactionRec(that, transaction.id); for (var i = 0; i < listeners.length; ++i) { var spec = listeners[i]; var multiplePaths = spec.segsArray.length > 1; // does this spec listen on multiple paths? If so, don't rebase arguments and just report once per transaction for (var j = 0; j < spec.segsArray.length; ++j) { var invalidPaths = fluid.matchChanges(changeMap, spec.segsArray[j], newHolder, oldHolder); // We only have multiple invalidPaths here if there is a wildcard for (var k = 0; k < invalidPaths.length; ++k) { Iif (applier.destroyed) { // 2nd guarding point for FLUID-5592 return; } var invalidPath = invalidPaths[k]; spec.listener = fluid.event.resolveListener(spec.listener); var args = [multiplePaths ? newHolder.model : fluid.model.getSimple(newHolder, invalidPath), multiplePaths ? oldHolder.model : fluid.model.getSimple(oldHolder, invalidPath), multiplePaths ? [] : invalidPath.slice(1), changeRequest, transaction, applier]; // FLUID-5489: Do not notify of null changes which were reported as a result of invalidating a higher path // TODO: We can improve greatly on efficiency by i) reporting a special code from fluid.matchChanges which signals the difference between invalidating a higher and lower path, // ii) improving fluid.model.diff to create fewer intermediate structures and no copies // TODO: The relay invalidation system is broken and must always be notified (branch 1) - since our old/new value detection is based on the wrong (global) timepoints in the transaction here, // rather than the "last received model" by the holder of the transform document if (!spec.isRelay) { var isNull = fluid.model.diff(args[0], args[1]); if (isNull) { continue; } var sourceExcluded = fluid.isExcludedChangeSource(transaction, spec); if (sourceExcluded) { continue; } } if (transRec && !spec.isRelay && spec.transactional) { // bottle up genuine external changes so we can sort and dedupe them later fluid.storeExternalChange(transRec, applier, invalidPath, spec, args); } else { spec.listener.apply(null, args); } } } } }; fluid.bindELMethods = function (applier) { applier.parseEL = function (EL) { return fluid.model.pathToSegments(EL, applier.options.resolverSetConfig); }; applier.composeSegments = function () { return applier.options.resolverSetConfig.parser.compose.apply(null, arguments); }; }; fluid.initModelEvent = function (that, applier, trans, listeners) { fluid.notifyModelChanges(listeners, "ADD", trans.oldHolder, fluid.emptyHolder, null, trans, applier, that); }; // A standard "empty model" for the purposes of comparing initial state during the primordial transaction fluid.emptyHolder = fluid.freezeRecursive({ model: undefined }); fluid.preFireChangeRequest = function (applier, changeRequest) { if (!changeRequest.type) { changeRequest.type = "ADD"; } changeRequest.segs = changeRequest.segs || applier.parseEL(changeRequest.path); }; // Automatically adapts change onto fireChangeRequest fluid.bindRequestChange = function (that) { that.change = function (path, value, type, source) { var changeRequest = { path: path, value: value, type: type, source: source }; that.fireChangeRequest(changeRequest); }; }; // Quick n dirty test to cheaply detect Object versus other JSON types fluid.isObjectSimple = function (totest) { return Object.prototype.toString.call(totest) === "[object Object]"; }; fluid.mergeChangeSources = function (target, globalSources) { Iif (fluid.isObjectSimple(globalSources)) { // TODO: No test for this branch! fluid.extend(target, globalSources); } else { fluid.each(fluid.makeArray(globalSources), function (globalSource) { target[globalSource] = true; }); } }; fluid.ChangeApplier = function () {}; fluid.makeHolderChangeApplier = function (holder, options) { options = fluid.model.defaultAccessorConfig(options); var applierId = fluid.allocateGuid(); var that = new fluid.ChangeApplier(); var name = fluid.isComponent(holder) ? "ChangeApplier for component " + fluid.dumpThat(holder) : "ChangeApplier with id " + applierId; $.extend(that, { applierId: applierId, holder: holder, listeners: fluid.makeEventFirer({name: "Internal change listeners for " + name}), transListeners: fluid.makeEventFirer({name: "External change listeners for " + name}), options: options, modelChanged: {}, preCommit: fluid.makeEventFirer({name: "preCommit event for " + name}), postCommit: fluid.makeEventFirer({name: "postCommit event for " + name}) }); that.destroy = function () { that.preCommit.destroy(); that.postCommit.destroy(); that.destroyed = true; }; that.modelChanged.addListener = function (spec, listener, namespace, softNamespace) { if (typeof(spec) === "string") { spec = { path: spec }; } else { spec = fluid.copy(spec); } spec.listenerId = spec.listenerId || fluid.allocateGuid(); // FLUID-5151: don't use identifyListener since event.addListener will use this as a namespace spec.namespace = namespace; spec.softNamespace = softNamespace; Iif (typeof(listener) === "string") { // The reason for "globalName" is so that listener names can be resolved on first use and not on registration listener = {globalName: listener}; } spec.listener = listener; if (spec.transactional !== false) { spec.transactional = true; } if (!spec.segsArray) { // It's a manual registration if (spec.path !== undefined) { spec.segs = spec.segs || that.parseEL(spec.path); } Eif (!spec.segsArray) { spec.segsArray = [spec.segs]; } } if (!spec.isRelay) { // This acts for listeners registered externally. For relays, the exclusion spec is stored in "cond" fluid.parseSourceExclusionSpec(spec, spec); spec.wildcard = fluid.accumulate(fluid.transform(spec.segsArray, function (segs) { return fluid.contains(segs, "*"); }), fluid.add, 0); Iif (spec.wildcard && spec.segsArray.length > 1) { fluid.fail("Error in model listener specification ", spec, " - you may not supply a wildcard pattern as one of a set of multiple paths to be matched"); } } var firer = that[spec.transactional ? "transListeners" : "listeners"]; firer.addListener(spec); return spec; // return is used in registerModelListeners }; that.modelChanged.removeListener = function (listener) { that.listeners.removeListener(listener); that.transListeners.removeListener(listener); }; that.fireChangeRequest = function (changeRequest) { var ation = that.initiate("local", changeRequest.source); ation.fireChangeRequest(changeRequest); ation.commit(); }; /** * Initiate a fresh transaction on this applier, perhaps coordinated with other transactions sharing the same id across the component tree * Arguments all optional * @param {String} localSource - "local", "relay" or null Local source identifiers only good for transaction's representative on this applier * @param {String|Array|Object} globalSources - Global source identifiers common across this transaction, expressed as a single string, an array of strings, or an object with a "toString" method. * @param {String} transactionId - Global transaction id to enlist with. * @return {Object} - The component initiating the change. */ that.initiate = function (localSource, globalSources, transactionId) { localSource = globalSources === "init" ? null : (localSource || "local"); // supported values for localSource are "local" and "relay" - globalSource of "init" defeats defaulting of localSource to "local" var defeatPost = localSource === "relay"; // defeatPost is supplied for all non-top-level transactions var trans = { instanceId: fluid.allocateGuid(), // for debugging only - the representative of this transction on this applier id: transactionId || fluid.allocateGuid(), // The global transaction id across all appliers - allocate here if this is the starting point changeRecord: { resolverSetConfig: options.resolverSetConfig, // here to act as "options" in applyHolderChangeRequest resolverGetConfig: options.resolverGetConfig }, reset: function () { trans.oldHolder = holder; trans.newHolder = { model: fluid.copy(holder.model) }; trans.changeRecord.changes = 0; trans.changeRecord.unchanged = 0; // just for type consistency - we don't use these values in the ChangeApplier trans.changeRecord.changeMap = {}; }, commit: function (code) { that.preCommit.fire(trans, that, code); if (trans.changeRecord.changes > 0) { var oldHolder = {model: holder.model}; holder.model = trans.newHolder.model; fluid.notifyModelChanges(that.transListeners.sortedListeners, trans.changeRecord.changeMap, holder, oldHolder, null, trans, that, holder); } if (!defeatPost) { that.postCommit.fire(trans, that, code); } }, fireChangeRequest: function (changeRequest) { fluid.preFireChangeRequest(that, changeRequest); changeRequest.transactionId = trans.id; var deltaMap = fluid.model.applyHolderChangeRequest(trans.newHolder, changeRequest, trans.changeRecord); fluid.notifyModelChanges(that.listeners.sortedListeners, deltaMap, trans.newHolder, holder, changeRequest, trans, that, holder); }, hasChangeSource: function (source) { return trans.fullSources[source]; } }; var transRec = fluid.getModelTransactionRec(holder, trans.id); if (transRec) { fluid.mergeChangeSources(transRec.sources, globalSources); trans.sources = transRec.sources; trans.fullSources = Object.create(transRec.sources); trans.fullSources[localSource] = true; } trans.reset(); fluid.bindRequestChange(trans); return trans; }; fluid.bindRequestChange(that); fluid.bindELMethods(that); return that; }; /** * Calculates the changes between the model values 'value' and * 'oldValue' and returns an array of change records. The optional * argument 'changePathPrefix' is prepended to the change path of * each record (this is useful for generating change records to be * applied at a non-root path in a model). The returned array of * change records may be used with fluid.fireChanges(). * * @param {Any} value - Model value to compare. * @param {Any} oldValue - Model value to compare. * @param {String|Array} [changePathPrefix] - [optional] Path prefix to prepend to change record paths, expressed as a string or an array of string segments. * @return {Array} - An array of change record objects. */ fluid.modelPairToChanges = function (value, oldValue, changePathPrefix) { changePathPrefix = changePathPrefix || ""; // Calculate the diff between value and oldValue var diffOptions = {changes: 0, unchanged: 0, changeMap: {}}; fluid.model.diff(oldValue, value, diffOptions); var changes = []; // Recursively process the diff to generate an array of change // records, stored in 'changes' fluid.modelPairToChangesImpl(value, fluid.pathUtil.parseEL(changePathPrefix), diffOptions.changeMap, [], changes); return changes; }; /** * This function implements recursive processing for * fluid.modelPairToChanges(). It builds an array of change * records, accumulated in the 'changes' argument, by walking the * 'changeMap' structure and 'value' model value. As we walk down * the model, our path from the root of the model is recorded in * the 'changeSegs' argument. * * @param {Any} value - Model value * @param {String[]} changePathPrefixSegs - Path prefix to prepend to change record paths, expressed as an array of string segments. * @param {String|Object} changeMap - The changeMap structure from fluid.model.diff(). * @param {String[]} changeSegs - Our path relative to the model value root, expressed as an array of string segments. * @param {Object[]} changes - The accumulated change record objects. */ fluid.modelPairToChangesImpl = function (value, changePathPrefixSegs, changeMap, changeSegs, changes) { if (changeMap === "ADD") { // The whole model value is new changes.push({ path: changePathPrefixSegs, value: value, type: "ADD" }); } else if (changeMap === "DELETE") { // The whole model value has been deleted changes.push({ path: changePathPrefixSegs, value: null, type: "DELETE" }); } else Eif (fluid.isPlainObject(changeMap, true)) { // Something within the model value has changed fluid.each(changeMap, function (change, seg) { var currentChangeSegs = changeSegs.concat([seg]); if (change === "ADD") { changes.push({ path: changePathPrefixSegs.concat(currentChangeSegs), value: fluid.get(value, currentChangeSegs), type: "ADD" }); } else if (change === "DELETE") { changes.push({ path: changePathPrefixSegs.concat(currentChangeSegs), value: null, type: "DELETE" }); } else Eif (fluid.isPlainObject(change, true)) { // Recurse down the tree of changes fluid.modelPairToChangesImpl(value, changePathPrefixSegs, change, currentChangeSegs, changes); } }); } }; })(jQuery, fluid_3_0_0); |