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/**
* @fileoverview
* Remote Client Implementation.
*
* Requires: Core, Serial, Core.Web, Application, Render.
*/
/**
* A client which provides a remote view of an Echo application being executed on the server.
* This client exchanges data with the remote server in the form of XML messages containing
* serialized components and events.
*
* Component synchronization peers that will be working exclusively with a RemoteClient may
* implement an optional storeProperty(clientMessage, property) method to
* provide custom property XML serialization. This should be avoided if possible, but may
* be necessary for serializing certain information such as the state of a model.
*/
Echo.RemoteClient = Core.extend(Echo.Client, {
$static: {
/**
* Base URL from which libraries should be retrieved.
* Libraries are loaded into global scope, and are thus not
* bound to any particular client instance.
* @type String
*/
libraryServerUrl: null,
/**
* Flag indicating whether global remote client initialization has been performed.
* @type Boolean
*/
initialized: false,
/**
* Default client configuration data.
*/
DEFAULT_CONFIGURATION: {
"NetworkError.Message": "A network error has occurred, please try again.",
"SessionExpiration.Message": "Your session has expired.",
"Resync.Message": "This window was not synchronized with the server and has been reset. " +
"Please try your last request again."
},
/**
* Initializes the remote-client-based application.
*/
init: function() {
if (Echo.RemoteClient.initialized) {
return;
}
Echo.RemoteClient.initialized = true;
Core.Web.init();
if (Core.Web.Env.ENGINE_MSHTML) {
// Set documentElement.style.overflow to hidden in order to hide root scrollbar in IE.
// This is a non-standard CSS property.
document.documentElement.style.overflow = "hidden";
}
}
},
/**
* Server user instance identifier.
* @type String
*/
_uiid: null,
/**
* The base server URL.
* @type String
*/
_serverUrl: null,
/**
* Flag indicating whether a client-server synchronization is requested.
* @type Boolean
*/
_syncRequested: false,
/**
* Flag indicating whether a client-server transaction is currently in progress.
* @type Boolean
*/
_transactionInProgress: false,
/**
* Identifier for input restriction registered with client during transactions.
* @type String
*/
_inputRestrictionId: null,
/**
* Function wrapper to invoke _processClientUpdate() method.
* @type Function
*/
_processClientUpdateRef: null,
/**
* Function wrapper to invoke _processClientEvent() method.
* @type Function
*/
_processClientEventRef: null,
/**
* Associative array mapping between shorthand URL codes and replacement values.
*/
_urlMappings: null,
/**
* Queue of commands to be executed. Each command occupies two
* indices, first index is the command peer, second is the command data.
* @type Array
*/
_commandQueue: null,
/**
* Outgoing client message.
* @type Echo.RemoteClient.ClientMessage
*/
_clientMessage: null,
/**
* AsyncManager instance which will invoke server-pushed operations.
* @type Echo.RemoteClient.AsyncManager
*/
_asyncManager: null,
/**
* Flag indicating whether the remote client has been initialized.
* @type Boolean
*/
_initialized: false,
/**
* The last component which was focused on the client before synchronization.
* @type Component
*/
_clientFocusedComponent: null,
/**
* The component which the server has requested to be focused.
* @type Component
*/
_serverFocusedComponent: null,
/**
* Current client/server transaction id.
* @type Number
*/
transactionId: 0,
/**
* Creates a new RemoteClient instance.
*
* @param serverUrl the URL of the server
* @param initId the initialization id, which should be provided in the initial client message
*/
$construct: function(serverUrl, initId) {
Echo.RemoteClient.init();
Echo.Client.call(this);
// Install default configuration.
for (var x in Echo.RemoteClient.DEFAULT_CONFIGURATION) {
this.configuration[x] = Echo.RemoteClient.DEFAULT_CONFIGURATION[x];
}
this._serverUrl = serverUrl;
this._processClientUpdateRef = Core.method(this, this._processClientUpdate);
this._processClientEventRef = Core.method(this, this._processClientEvent);
this._commandQueue = null;
this._clientMessage = new Echo.RemoteClient.ClientMessage(this, initId);
this._asyncManager = new Echo.RemoteClient.AsyncManager(this);
},
/**
* Adds a listener for an arbitrary event type to a component.
* This method is invoked by the Serial module when event tags are
* processed during the deserialization of component synchronization
* XML messages.
*
* @param {Echo.Component} component the component on which the listener should be added
* @param {String} eventType the type of event
*/
addComponentListener: function(component, eventType) {
component.addListener(eventType, this._processClientEventRef);
},
/**
* Decompresses a shorthand URL into a valid full-length URL.
* A shorthand URL is expressed as "!A!xxxx" where
* "A" is a key whose value contains the first portion of the URL
* and "xxxx" is the latter portion of the URL. Such URLs are used
* to reduce the amount of bandwidth used in transmitting large
* numbers of the same URL from server-to-client.
*
* @param url the shorthand URL to process
* @return the full-length valid URL
* @type String
*/
decompressUrl: function(url) {
var urlTokens = url.split("!");
if (urlTokens[0]) {
// urlTokens[0] is not empty: URL is not a shorthand URL.
return url;
} else {
// urlTokens[0] = empty
// urlTokens[1] = key
// urlTokens[2] = baseUrl
if (urlTokens.length != 3) {
throw new Error("Invalid encoded URL: " + url);
}
var replacementValue = this._urlMappings[urlTokens[1]];
if (replacementValue == null) {
throw new Error("Invalid URL shorthand key \"" + urlTokens[1] + "\" in URL: " + url);
}
return replacementValue + urlTokens[2];
}
},
/**
* Test a given event, if it is a async event.
* An async-event starts by convention with 'async_' on property eventType.
*
* @param eventType the string-identifier of the event
* @return true, if it is a async event, false if not
* @type Boolean
*/
_isAsyncEvent: function(eventType) {
if(eventType && typeof eventType === "string") {
// if it startsWith 'async_' return true ->
if(eventType.length > 5) {
return (eventType.substring(0,5) === 'async_');
}
}
// if eventType is not a string or even null:
return false;
},
/**
* Enqueues a command to be processed after component synchronization has been completed.
*
* @param commandPeer the command peer to execute
* @param commandData an object containing the command data sent from the server
*/
_enqueueCommand: function(commandPeer, commandData) {
if (this._commandQueue == null) {
this._commandQueue = [];
}
this._commandQueue.push(commandPeer, commandData);
},
/**
* Executes all enqueued commands; empties the queue.
*/
_executeCommands: function() {
if (this._commandQueue) {
for (var i = 0; i < this._commandQueue.length; i += 2) {
this._commandQueue[i].execute(this, this._commandQueue[i + 1]);
}
this._commandQueue = null;
}
},
/**
* Returns the URL of a library service based on the serviceId.
*
* @param {String} serviceId the serviceId
* @return the full library URL
* @type String
*/
_getLibraryServiceUrl: function(serviceId) {
if (!Echo.RemoteClient._libraryServerUrl) {
Echo.RemoteClient._libraryServerUrl = this._serverUrl;
}
if (this._uiid == null) {
return Echo.RemoteClient._libraryServerUrl + "?sid=" + serviceId;
} else {
return Echo.RemoteClient._libraryServerUrl + "?sid=" + serviceId + "&uiid=" + this._uiid;
}
},
/** @see Echo.Client#getResoruceUrl */
getResourceUrl: function(packageName, resourceName) {
return this.getServiceUrl("Echo.Resource") + "&pkg=" + packageName + "&res=" + resourceName;
},
/**
* Returns the URL of a remote server-side service.
*
* @param {String} serviceId the service id
* @return the URL
* @type String
*/
getServiceUrl: function(serviceId) {
if (this._uiid == null) {
return this._serverUrl + "?sid=" + serviceId;
} else {
return this._serverUrl + "?sid=" + serviceId + "&uiid=" + this._uiid;
}
},
/**
* Handles an invalid response from the server.
*
* @param e the HttpConnection response event
*/
_handleInvalidResponse: function(e) {
var detail = null;
if (e.exception) {
detail = e.exception.toString();
} else if (e.source.getResponseText()) {
if (e.source.getResponseText().indexOf("!*! Session Expired") != -1) {
this._handleSessionExpiration();
return;
} else {
detail = e.source.getResponseText();
}
} else {
this._handleNetworkError();
return;
}
this.fail(detail);
},
/**
* Handles server-side session expiration.
*/
_handleSessionExpiration: function() {
var element = this.domainElement;
try {
this.dispose();
} finally {
if (this.configuration["SessionExpiration.Restart"]) {
// Restart immediately.
window.location.reload();
} else if (this.configuration["SessionExpiration.URI"]) {
// Redirect.
window.location.href = this.configuration["SessionExpiration.URI"];
} else {
// Display error.
this.displayError(element, this.configuration["SessionExpiration.Message"], null,
this.configuration["Action.Continue"], function() {
window.location.reload();
}, Echo.Client.STYLE_MESSAGE);
}
}
},
_handleNetworkError: function() {
var element = this.domainElement;
try {
this.dispose();
} finally {
// Display error.
this.displayError(element, this.configuration["NetworkError.Message"], null,
this.configuration["Action.Continue"], function() {
window.location.reload();
}, Echo.Client.STYLE_MESSAGE);
}
},
/**
* Initializes the remote client. This method will perform the following operations:
*
*
Find the domain element in which the application should exist by parsing the
* initial server message XML document.
*
Create a new Echo.Application instance,
*
Register a component update listener on that application instance such that
* a user's input will be stored in the outgoing ClientMessage.
*
Invoke Echo.Client.configure() to initialize the client.
*
*
* @param {Document} initialResponseDocument the initial ServerMessage XML document
* received from the server (this document contains some necessary start-up information
* such as the id of the root element)
*/
init: function(initialResponseDocument) {
this._uiid = initialResponseDocument.documentElement.getAttribute("u");
if (this._uiid === "") {
this._uiid = null;
}
this._urlMappings = {};
this._urlMappings.I = this._serverUrl + "?" + (this._uiid == null ? "" : "uiid=" + this._uiid + "&") +
"sid=Echo.Image&iid=";
// Find domain element.
var domainElementId = initialResponseDocument.documentElement.getAttribute("root");
var domainElement = document.getElementById(domainElementId);
if (!domainElement) {
throw new Error("Cannot find domain element: " + domainElementId);
}
// Create an application instance.
var application = new Echo.Application();
// Register an update listener to receive notification of user actions such that they
// may be remarked in the outgoing ClientMessage.
application.addListener("componentUpdate", this._processClientUpdateRef);
// Perform general purpose client configuration.
this.configure(application, domainElement);
// Mark the client as initialized.
this._initialized = true;
},
/**
* Processes an event from a component that requires immediate server interaction.
*
* @param e the event to process
*/
_processClientEvent: function(e) {
if (this._syncRequested || this._transactionInProgress) {
return;
}
this._clientMessage.setEvent(e.source.renderId, e.type, e.data);
// added: && !this._isAsyncEvent(e.type) to handle async events
if (!this._inputRestrictionId && !this._isAsyncEvent(e.type)) {
this._inputRestrictionId = this.createInputRestriction();
}
this._syncRequested = true;
Core.Web.Scheduler.run(Core.method(this, this.sync));
},
/**
* Processes a user update to a component (storing the updated state in the outgoing
* client message).
*
* @param e the property update event from the component
*/
_processClientUpdate: function(e) {
if (this._transactionInProgress) {
return;
}
var stored = false;
if (e.parent.peer.storeProperty) {
stored = e.parent.peer.storeProperty(this._clientMessage, e.propertyName);
}
if (!stored) {
this._clientMessage.storeProperty(e.parent.renderId, e.propertyName, e.newValue);
}
},
/**
* ServerMessage completion listener.
*
* @param e the server message completion event
*/
_processSyncComplete: function(e) {
// Mark time of serialization completion with profiling timer.
if (Echo.Client.profilingTimer) {
Echo.Client.profilingTimer.mark("ser");
}
this.processUpdates();
this._executeCommands();
// Register component update listener
this.application.addListener("componentUpdate", this._processClientUpdateRef);
// Flag transaction as being complete.
this._transactionInProgress = false;
this.removeInputRestriction(this._inputRestrictionId);
this._inputRestrictionId = null;
// Focus component
if (this._serverFocusedComponent) {
this.application.setFocusedComponent(this._serverFocusedComponent);
}
if (Echo.Client.profilingTimer) {
Core.Debug.consoleWrite(Echo.Client.profilingTimer + " /pc:" + Echo.Render._loadedPeerCount);
Echo.Client.profilingTimer = null;
}
if (e.source.resync) {
this.displayError(this.domainElement, this.configuration["Resync.Message"], null,
this.configuration["Action.Continue"], null, Echo.Client.STYLE_MESSAGE);
}
},
/**
* Process a response to a client-server synchronization.
*
* @param e the HttpConnection response event
*/
_processSyncResponse: function(e) {
// Retrieve response document.
var responseDocument = e.source.getResponseXml();
// Verify that response document exists and is valid.
if (!e.valid || !responseDocument || !responseDocument.documentElement) {
this._handleInvalidResponse(e);
return;
}
// If this is the first ServerMessage received, initialize the client
// This step will create the application, determine where in the DOM the application should be
// rendered, and so forth.
if (!this._initialized) {
this.init(responseDocument);
}
// Profiling Timer (Un-comment to enable, comment to disable).
Echo.Client.profilingTimer = new Echo.Client.Timer();
// Remove component update listener from application. This listener is listening
// for user input.
this.application.removeListener("componentUpdate", this._processClientUpdateRef);
// Create new ServerMessage object with response document.
var serverMessage = new Echo.RemoteClient.ServerMessage(this, responseDocument);
this.transactionId = serverMessage.transactionId;
// Add completion listener to invoke _processSyncComplete when message has been fully processed.
// (Some elements of the server message are processed asynchronously).
serverMessage.addCompletionListener(Core.method(this, this._processSyncComplete));
// Start server message processing.
serverMessage.process();
},
/**
* Removes a listener for an arbitrary event type from a component.
*
* @param {Echo.Component} component the component from which the listener should be removed
* @param {String} eventType the type of event
*/
removeComponentListener: function(component, eventType) {
component.removeListener(eventType, this._processClientEventRef);
},
/**
* Initiates a client-server synchronization.
*/
sync: function() {
if (this._transactionInProgress) {
throw new Error("Attempt to invoke client/server synchronization while another transaction is in progress; " +
"event data: componentId=" + this._clientMessage._eventComponentId + " eventType=" +
this._clientMessage._eventType + " eventData=" + this._clientMessage._eventData);
}
this._clientFocusedComponent = this.application ? this.application.getFocusedComponent() : null;
this._serverFocusedComponent = null;
this._transactionInProgress = true;
this._syncRequested = false;
// added: && !this._isAsyncEvent(this._clientMessage._eventType) to handle async events
if (!this._inputRestrictionId && !this._isAsyncEvent(this._clientMessage._eventType)) {
this._inputRestrictionId = this.createInputRestriction();
}
this._asyncManager._stop();
this._syncInitTime = new Date().getTime();
var conn = new Core.Web.HttpConnection(this.getServiceUrl("Echo.Sync"), "POST",
this._clientMessage._renderXml(), "text/xml;charset=utf-8");
// Create new client message.
this._clientMessage = new Echo.RemoteClient.ClientMessage(this, null);
conn.addResponseListener(Core.method(this, this._processSyncResponse));
conn.connect();
}
});
/**
* Abstract base class for server message directive processors.
*/
Echo.RemoteClient.DirectiveProcessor = Core.extend({
/**
* The remote client instance.
* @type Echo.RemoteClient
*/
client: null,
/**
* Constructor.
* @param {Echo.RemoteClient} client the remote client instance
*/
$construct: function(client) {
this.client = client;
},
$abstract: {
/**
* Process a server message directive.
*
* @param {Element} dirElement the directive element
*/
process: function(dirElement) { }
}
});
/**
* Manages server-pushed updates to the client.
*/
Echo.RemoteClient.AsyncManager = Core.extend({
$static: {
/**
* Number of times the client should attempt to contact the server.
*
* @type Number
*/
MAX_CONNECT_ATTEMPTS: 3
},
/**
* The supported client.
*
* @type Echo.RemoteClient
*/
_client: null,
/**
* The number of times the client has unsuccessfully attempted to contact the server.
*
* @type Number
*/
_failedConnectAttempts: null,
/**
* The repeating runnable used for server polling.
*
* @type Core.Web.Scheduler.Runnable
*/
_runnable: null,
/**
* Creates a new asynchronous manager.
*
* @param {Echo.RemoteClient} client the supported client
*/
$construct: function(client) {
this._client = client;
this._runnable = new Core.Web.Scheduler.MethodRunnable(Core.method(this, this._pollServerForUpdates), 1000, false);
},
/**
* Creates and invokes a new HttpConnection to the server to poll the server and determine whether
* it has any updates that need to be pushed to the client.
*/
_pollServerForUpdates: function() {
var conn = new Core.Web.HttpConnection(this._client.getServiceUrl("Echo.AsyncMonitor"), "GET");
conn.addResponseListener(Core.method(this, this._processPollResponse));
conn.connect();
},
/**
* Response processor for server polling request.
* In the event a server action is required, this method will submit the client message to the
* server immediately. The server will push any updates into the reciprocated server message.
* If no action is required, the next polling interval will be scheduled.
*
* @param e the poll response event
*/
_processPollResponse: function(e) {
var responseDocument = e.source.getResponseXml();
if (e.valid && responseDocument && responseDocument.documentElement) {
this._failedConnectAttempts = 0;
if (responseDocument.documentElement.getAttribute("request-sync") == "true") {
if (!this._client._transactionInProgress && !this._client._syncRequested) {
this._client.sync();
}
return;
}
} else if (++this._failedConnectAttempts >= Echo.RemoteClient.AsyncManager.MAX_CONNECT_ATTEMPTS) {
this._client._handleInvalidResponse(e);
this._failedConnectAttempts = 0;
return;
}
Core.Web.Scheduler.add(this._runnable);
},
/**
* Sets the interval at which the server should be polled.
*
* @param {Number} interval the new polling interval, in milliseconds
*/
_setInterval: function(interval) {
this._runnable.timeInterval = interval;
},
/**
* Starts server polling for asynchronous tasks.
*/
_start: function() {
this._failedConnectAttempts = 0;
Core.Web.Scheduler.add(this._runnable);
},
/**
* Stops server polling for asynchronous tasks.
*/
_stop: function() {
Core.Web.Scheduler.remove(this._runnable);
}
});
/**
* Client-to-server synchronization message.
* This object is used to collect state changes on the client and then
* render an XML version to be POSTed to a server-side Echo application.
*/
Echo.RemoteClient.ClientMessage = Core.extend({
$static: {
/**
* @class Utility class for constructing the client properties directive.
*/
_ClientProperties: Core.extend({
/**
* The directive element
* @type Element
*/
_element: null,
/**
* The client message on which the client properties directive will be sent.
* @type Echo.RemoteClient.ClientMessage
*/
_clientMessage: null,
/**
* Creates a new ClientProperties directive object.
*
* @param {Echo.RemoteClient.ClientMessage} clientMessage the client message object
* @param map initial properties to store (key/value pairs)
*/
$construct: function(clientMessage, map) {
this._element = clientMessage._document.createElement("dir");
this._element.setAttribute("proc", "ClientProperties");
clientMessage._document.documentElement.appendChild(this._element);
this._clientMessage = clientMessage;
if (map) {
for (var key in map) {
this._add(key, map[key]);
}
}
},
/**
* Constructs a property element with the given key-value pair and adds that to the
* client properties directive in the client message.
*
* @param {String} key the key
* @param value the value
*/
_add: function(key, value) {
if (value == null) {
return;
}
var element = this._clientMessage._document.createElement("p");
element.setAttribute("n", key);
Echo.Serial.storeProperty(this._clientMessage._client, element, value);
this._element.appendChild(element);
}
})
},
/**
* The RemoteClient which generated this message.
* @type Echo.RemoteClient
*/
_client: null,
/**
* Mapping between component ids and updated property values.
* Values in this map are updated by the storeProperty() method.
* These values will be rendered to XML when required.
*/
_componentIdToPropertyMap: null,
/**
* Id of the component which fired the event that is responsible for
* the client message being sent to the server.
* @type String
*/
_eventComponentId: null,
/**
* Type of event fired to cause server interaction.
* @type String
*/
_eventType: null,
/**
* Event data object of event responsible for server interaction.
*/
_eventData: null,
/**
* The DOM object to which the client message will be rendered.
* @type Document
*/
_document: null,
/**
* Creates a new client message.
*
* @param {Echo.RemoteClient} client the RemoteClient
* @param {String} initId the initialization id provided to the RemoteClient constructor (if this an initialization request)
* or null if it is not
*/
$construct: function(client, initId) {
this._client = client;
this._componentIdToPropertyMap = {};
this._document = Core.Web.DOM.createDocument("http://www.nextapp.com/products/echo/svrmsg/clientmessage.3.0", "cmsg");
if (initId != null) {
this._document.documentElement.setAttribute("t", "init");
this._document.documentElement.setAttribute("w", Echo.Client.windowId);
this._document.documentElement.setAttribute("ii", initId);
this._renderClientProperties();
}
},
/**
* Queries the application for the currently focused component and renders
* this information to the client message DOM.
*/
_renderCFocus: function() {
if (!this._client.application) {
return;
}
var focusedComponent = this._client.application.getFocusedComponent();
if (focusedComponent && focusedComponent.renderId.substring(0,2) == "C.") {
var cFocusElement = this._document.createElement("dir");
cFocusElement.setAttribute("proc", "CFocus");
var focusElement = this._document.createElement("focus");
focusElement.setAttribute("i", focusedComponent.renderId);
cFocusElement.appendChild(focusElement);
this._document.documentElement.appendChild(cFocusElement);
}
},
/**
* Renders component hierarchy state change information to the client message DOM.
* This information is retrieved from instance variables of the client message object,
* i.e., the component-id-to-property-value map and event properties.
*/
_renderCSync: function() {
var cSyncElement = this._document.createElement("dir");
cSyncElement.setAttribute("proc", "CSync");
// Render event information.
if (this._eventType) {
var eElement = this._document.createElement("e");
eElement.setAttribute("t", this._eventType);
eElement.setAttribute("i", this._eventComponentId);
if (this._eventData != null) {
Echo.Serial.storeProperty(this._client, eElement, this._eventData);
}
cSyncElement.appendChild(eElement);
}
// Render property information.
for (var componentId in this._componentIdToPropertyMap) {
var propertyMap = this._componentIdToPropertyMap[componentId];
var component = this._client.application.getComponentByRenderId(componentId);
for (var propertyName in propertyMap) {
var propertyValue = propertyMap[propertyName];
var pElement = this._document.createElement("p");
pElement.setAttribute("i", componentId);
pElement.setAttribute("n", propertyName);
Echo.Serial.storeProperty(this._client, pElement, propertyValue);
cSyncElement.appendChild(pElement);
}
}
this._document.documentElement.appendChild(cSyncElement);
},
/**
* Renders information about the client environment to the client message DOM.
* This information is rendered only in the first client message to the server.
*/
_renderClientProperties: function() {
var env = Core.Web.Env;
var cp = new Echo.RemoteClient.ClientMessage._ClientProperties(this, {
screenWidth: screen.width,
screenHeight: screen.height,
screenColorDepth: screen.colorDepth,
utcOffset: 0 - parseInt(new Date().getTimezoneOffset(), 10),
navigatorAppName: window.navigator.appName,
navigatorAppVersion: window.navigator.appVersion,
navigatorAppCodeName: window.navigator.appCodeName,
navigatorCookieEnabled: window.navigator.cookieEnabled,
navigatorJavaEnabled: window.navigator.javaEnabled(),
navigatorLanguage: window.navigator.language ? window.navigator.language : window.navigator.userLanguage,
navigatorPlatform: window.navigator.platform,
navigatorUserAgent: window.navigator.userAgent,
browserChrome: env.BROWSER_CHROME,
browserOpera: env.BROWSER_OPERA,
browserSafari: env.BROWSER_SAFARI,
browserKonqueror: env.BROWSER_KONQUEROR,
browserMozillaFirefox: env.BROWSER_FIREFOX,
browserMozilla: env.BROWSER_MOZILLA,
browserInternetExplorer: env.BROWSER_INTERNET_EXPLORER,
browserVersionMajor: env.BROWSER_VERSION_MAJOR,
browserVersionMinor: env.BROWSER_VERSION_MINOR,
engineGecko: env.ENGINE_GECKO,
engineKHTML: env.ENGINE_KHTML,
engineMSHTML: env.ENGINE_MSHTML,
enginePresto: env.ENGINE_PRESTO,
engineWebKit: env.ENGINE_WEBKIT,
engineVersionMajor: env.ENGINE_VERSION_MAJOR,
engineVersionMinor: env.ENGINE_VERSION_MINOR
});
},
/**
* Renders all information to the XML DOM and returns it.
*
* @return the DOM
* @type Document
*/
_renderXml: function() {
if (!this._rendered) {
this._renderCFocus();
this._renderCSync();
this._document.documentElement.setAttribute("i", this._client.transactionId);
this._rendered = true;
}
return this._document;
},
/**
* Sets the event that will cause the client-server interaction.
*
* @param {String} componentId the renderId of the event-firing component
* @param {String} eventType the type of the event
* @param the event data object
*/
setEvent: function(componentId, eventType, eventData) {
if (this._eventComponentId) {
return;
}
this._eventComponentId = componentId;
this._eventType = eventType;
this._eventData = eventData;
},
/**
* Stores information about a property change to a component.
*
* @param {String} componentId the renderId of the component
* @param {String} propertyName the name of the property
* @param the new property value
*/
storeProperty: function(componentId, propertyName, propertyValue) {
var propertyMap = this._componentIdToPropertyMap[componentId];
if (!propertyMap) {
propertyMap = {};
this._componentIdToPropertyMap[componentId] = propertyMap;
}
propertyMap[propertyName] = propertyValue;
}
});
/**
* Namespace/base class for command execution peers.
* @namespace
*/
Echo.RemoteClient.CommandExec = Core.extend({
$abstract: true,
$static: {
/**
* Executes the command.
* Command implementations should override. Not inherited, provided for documentation purposes.
*
* @param {Echo.Client} client the client
* @param commandData object containing command properties provided from server
*/
execute: function(client, commandData) { }
}
});
/**
* Server message processing facility.
* Parses XML DOM of message received from server, first loading required modules and then delegating to registered server message
* directive processors.
*/
Echo.RemoteClient.ServerMessage = Core.extend({
$static: {
/**
* Mapping between processor names and instantiable Echo.RemoteClient.DirectiveProcessor types.
*/
_processorClasses: { },
/**
* Registers a server message directive processor.
*
* @param {String} name the processor name
* @param {Echo.RemoteClient.DirectiveProcessor} the processor
*/
addProcessor: function(name, processor) {
this._processorClasses[name] = processor;
}
},
/**
* @type Echo.RemoteClient
*/
client: null,
/** Provided transaction id. */
transactionId: null,
/**
* The server message DOM.
* @type Document
*/
document: null,
/**
* Listener storage facility.
* @type Core.ListenerList
*/
_listenerList: null,
/**
* Mapping between directive processor names and processor instances.
*/
_processorInstances: null,
/**
* Flag indicating whether full-resynchronization is required.
*/
resync: false,
/**
* Creates a new ServerMessage.
*
* @param {Echo.RemoteClient} the client
* @param {Document} the received server message DOM
*/
$construct: function(client, xmlDocument) {
this.client = client;
this.document = xmlDocument;
this._listenerList = new Core.ListenerList();
this._processorInstances = { };
this.transactionId = xmlDocument.documentElement.getAttribute("i");
if (xmlDocument.documentElement.getAttribute("resync")) {
this.resync = true;
}
},
/**
* Adds a completion listener to be notified when the server message has been processed.
*
* @param {Function} l the listener to add
*/
addCompletionListener: function(l) {
this._listenerList.addListener("completion", l);
},
/**
* Begins processing. This method may return asynchronously, completion listeners should be registered to determine
* when processing has completed.
*/
process: function() {
// Processing phase 1: load libraries.
var libsElement = Core.Web.DOM.getChildElementByTagName(this.document.documentElement, "libs");
if (libsElement) {
var libraryGroup = new Core.Web.Library.Group();
var element = libsElement.firstChild;
while (element) {
if (element.nodeType == 1) {
if (element.nodeName == "lib") {
var url = this.client._getLibraryServiceUrl(element.firstChild.data);
libraryGroup.add(url);
}
}
element = element.nextSibling;
}
if (libraryGroup.hasNewLibraries()) {
libraryGroup.addLoadListener(Core.method(this, this._processPostLibraryLoad));
libraryGroup.load();
} else {
this._processPostLibraryLoad();
}
} else {
this._processPostLibraryLoad();
}
},
/**
* Performs processing operations after required JavaScript modules have been loaded.
* May have been invoked directly by process() or as a Core.Web.LibraryGroup loadListener.
* Notifies completion listeners of processing completion.
*/
_processPostLibraryLoad: function(e) {
try {
if (Echo.Client.profilingTimer) {
Echo.Client.profilingTimer.mark("lib"); // Library Loading
}
if (e && !e.success) {
this.client.fail("Cannot install library: " + e.url + " Exception: " + e.ex);
return;
}
// Processing phase 2: invoke directives.
var groupElements = Core.Web.DOM.getChildElementsByTagName(this.document.documentElement, "group");
for (var i = 0; i < groupElements.length; ++i) {
var dirElements = Core.Web.DOM.getChildElementsByTagName(groupElements[i], "dir");
for (var j = 0; j < dirElements.length; ++j) {
var procName = dirElements[j].getAttribute("proc");
var processor = this._processorInstances[procName];
if (!processor) {
// Create new processor instance.
if (!Echo.RemoteClient.ServerMessage._processorClasses[procName]) {
throw new Error("Invalid processor specified in ServerMessage: " + procName);
}
processor = new Echo.RemoteClient.ServerMessage._processorClasses[procName](this.client);
this._processorInstances[procName] = processor;
}
processor.process(dirElements[j]);
}
}
// Complete: notify listeners of completion.
this._listenerList.fireEvent({type: "completion", source: this});
// Start server push listener if required.
if (this.document.documentElement.getAttribute("async-interval")) {
this.client._asyncManager._setInterval(parseInt(this.document.documentElement.getAttribute("async-interval"), 10));
this.client._asyncManager._start();
}
} catch (ex) {
this.client.fail("Exception: " + ex);
}
},
/**
* Removes a completion listener to be notified when the server message has been processed.
*
* @param {Function} l the listener to remove
*/
removeCompletionListener: function(l) {
this._listenerList.removeListener("completion", l);
}
});
// Echo.RemoteClient.DirectiveProcessor Implementations
/**
* SerevrMessage directive processor for general application-related synchronization.
*/
Echo.RemoteClient.ApplicationSyncProcessor = Core.extend(Echo.RemoteClient.DirectiveProcessor, {
$load: function() {
Echo.RemoteClient.ServerMessage.addProcessor("AppSync", this);
},
/** @see #Echo.RemoteClient.DirectiveProcessor#process */
process: function(dirElement) {
var propertyElement = dirElement.firstChild;
while (propertyElement) {
if (propertyElement.nodeName == "locale") {
this.client.application.setLocale(propertyElement.firstChild.nodeValue);
}
if (propertyElement.nodeName == "dir") {
this.client.application.setLayoutDirection(propertyElement.firstChild.nodeValue === "rtl" ?
Echo.LayoutDirection.RTL : Echo.LayoutDirection.LTR);
}
if (propertyElement.nodeName == "config") {
// Install customized configuration.
var pElement = propertyElement.firstChild;
while (pElement) {
Echo.Serial.loadProperty(this.client, pElement, null, this.client.configuration, null);
pElement = pElement.nextSibling;
}
}
propertyElement = propertyElement.nextSibling;
}
}
});
/**
* SerevrMessage directive processor for command executions.
*/
Echo.RemoteClient.CommandExecProcessor = Core.extend(Echo.RemoteClient.DirectiveProcessor, {
$static: {
/** Mapping between command type names and command peer objects */
_typeToPeerMap: {},
/**
* Registers a command execution peer.
*
* @param {String} type the command type name
* @param {Echo.RemoteClient.CommandExec} commandPeer an object providing an 'execute()' method which be invoked to
* execute the command.
*/
registerPeer: function(type, commandPeer) {
Echo.RemoteClient.CommandExecProcessor._typeToPeerMap[type] = commandPeer;
}
},
$load: function() {
Echo.RemoteClient.ServerMessage.addProcessor("CmdExec", this);
},
/** @see #Echo.RemoteClient.DirectiveProcessor#process */
process: function(dirElement) {
var cmdElement = dirElement.firstChild;
while (cmdElement) {
var type = cmdElement.getAttribute("t");
var commandPeer = Echo.RemoteClient.CommandExecProcessor._typeToPeerMap[type];
if (!commandPeer) {
throw new Error("Peer not found for: " + type);
}
var commandData = {};
var pElement = cmdElement.firstChild;
while (pElement) {
Echo.Serial.loadProperty(this.client, pElement, null, commandData, null);
pElement = pElement.nextSibling;
}
this.client._enqueueCommand(commandPeer, commandData);
cmdElement = cmdElement.nextSibling;
}
}
});
/**
* ServerMessage directive processor for component focus.
*/
Echo.RemoteClient.ComponentFocusProcessor = Core.extend(Echo.RemoteClient.DirectiveProcessor, {
$load: function() {
Echo.RemoteClient.ServerMessage.addProcessor("CFocus", this);
},
/** @see #Echo.RemoteClient.DirectiveProcessor#process */
process: function(dirElement) {
var element = dirElement.firstChild;
while (element) {
if (element.nodeType == 1 && element.nodeName == "focus") {
var newComponent = this.client.application.getComponentByRenderId(element.getAttribute("i"));
if (newComponent != this.client._clientFocusedComponent) {
this.client._serverFocusedComponent = newComponent;
}
}
element = element.nextSibling;
}
}
});
/**
* ServerMessage directive processor for component synchronizations (initialization phase).
*
* Processes initialization directives related to component hierarchy.
* Currently limited to clearing entire hierarchy.
*/
Echo.RemoteClient.ComponentSyncInitProcessor = Core.extend(Echo.RemoteClient.DirectiveProcessor, {
$load: function() {
Echo.RemoteClient.ServerMessage.addProcessor("CSyncIn", this);
},
/** @see #Echo.RemoteClient.DirectiveProcessor#process */
process: function(dirElement) {
var element = dirElement.firstChild;
while (element) {
if (element.nodeType == 1 && element.nodeName == "cl") {
this.client.application.rootComponent.removeAll();
}
element = element.nextSibling;
}
}
});
/**
* ServerMessage directive processor for component synchronizations (remove phase).
*
* Processes directives to remove components. Performed before update phase to
* bring component hierarchy to a minimal state before updates occur.
*/
Echo.RemoteClient.ComponentSyncRemoveProcessor = Core.extend(Echo.RemoteClient.DirectiveProcessor, {
$static: {
/**
* Reverse array sorter for removing components by index from last to first.
* @see Array#sort
*/
_numericReverseSort: function(a, b) {
return b - a;
}
},
$load: function() {
Echo.RemoteClient.ServerMessage.addProcessor("CSyncRm", this);
},
/** @see #Echo.RemoteClient.DirectiveProcessor#process */
process: function(dirElement) {
var rmElement = dirElement.firstChild;
while (rmElement) {
if (rmElement.nodeType != 1) {
continue;
}
// Determine parent component.
var parentComponent;
if (rmElement.getAttribute("r") == "true") {
parentComponent = this.client.application.rootComponent;
} else {
var parentId = rmElement.getAttribute("i");
parentComponent = this.client.application.getComponentByRenderId(parentId);
}
// Retrieve child ids and remove.
var childElementIds = rmElement.getAttribute("rm").split(",");
this._removeComponents(parentComponent, childElementIds);
rmElement = rmElement.nextSibling;
}
},
/**
* Removes components with specified ids from specified parent component.
*
* @param {Echo.Component} parentComponent the parent component
* @param {Array} childElementIds array containing ids of child elements to remove.
*/
_removeComponents: function(parentComponent, childElementIds) {
var i;
if (childElementIds.length > 5) {
// Special case: many children being removed: create renderId -> index map and remove by index
// in order to prevent Component.indexOf() of from being invoked n times.
// Create map between ids and indices.
var idToIndexMap = {};
for (i = 0; i < parentComponent.children.length; ++i) {
idToIndexMap[parentComponent.children[i].renderId] = i;
}
// Create array of indices to remove.
var indicesToRemove = [];
for (i = 0; i < childElementIds.length; ++i) {
var index = idToIndexMap[childElementIds[i]];
if (index != null) {
indicesToRemove.push(parseInt(index, 10));
}
}
indicesToRemove.sort(Echo.RemoteClient.ComponentSyncRemoveProcessor._numericReverseSort);
// Remove components (last to first).
for (i = 0; i < indicesToRemove.length; ++i) {
parentComponent.remove(indicesToRemove[i]);
}
} else {
for (i = 0; i < childElementIds.length; ++i) {
var component = this.client.application.getComponentByRenderId(childElementIds[i]);
if (component) {
parentComponent.remove(component);
}
}
}
}
});
/**
* ServerMessage directive processor for component synchronizations (update phase).
*
* Processes directives to update components (add children, update properties),
* clear entire component hierarchy (for full-rerender), set stylesheet,
* and store referenced properties/styles.
*/
Echo.RemoteClient.ComponentSyncUpdateProcessor = Core.extend(Echo.RemoteClient.DirectiveProcessor, {
$load: function() {
Echo.RemoteClient.ServerMessage.addProcessor("CSyncUp", this);
},
/** Mapping between referenced property ids and values. */
_propertyMap : null,
/** Mapping between referenced style ids and values. */
_styleMap: null,
/** @see #Echo.RemoteClient.DirectiveProcessor#process */
process: function(dirElement) {
var element;
element = dirElement.firstChild;
while (element) {
if (element.nodeType == 1) {
switch (element.nodeName) {
case "ss": this._processStyleSheet(element); break;
case "up": this._processUpdate(element); break;
case "rp": this._processReferencedProperties(element); break;
case "rs": this._processReferencedStyles(element); break;
}
}
element = element.nextSibling;
}
},
/**
* Process an "rp" directive to store referenced properties during the synchronization.
*
* @param {Element} rpElement the directive element
*/
_processReferencedProperties: function(rpElement) {
var propertyElement = rpElement.firstChild;
while (propertyElement) {
if (propertyElement.nodeName == "p") {
var propertyId = propertyElement.getAttribute("i");
var propertyType = propertyElement.getAttribute("t");
var translator = Echo.Serial.getPropertyTranslator(propertyType);
if (!translator) {
throw new Error("Translator not available for property type: " + propertyType);
}
var propertyValue = translator.toProperty(this.client, propertyElement);
if (!this._propertyMap) {
this._propertyMap = {};
}
this._propertyMap[propertyId] = propertyValue;
}
propertyElement = propertyElement.nextSibling;
}
},
/**
* Process an "rs" directive to store referenced styles during the synchronization.
*
* @param {Element} rsElement the directive element
*/
_processReferencedStyles: function(rsElement) {
var styleElement = rsElement.firstChild;
while (styleElement) {
if (styleElement.nodeName == "s") {
var styleId = styleElement.getAttribute("i");
var style = { };
var propertyElement = styleElement.firstChild;
while (propertyElement) {
Echo.Serial.loadProperty(this.client, propertyElement, null, style, this._propertyMap);
propertyElement = propertyElement.nextSibling;
}
if (!this._styleMap) {
this._styleMap = {};
}
this._styleMap[styleId] = style;
}
styleElement = styleElement.nextSibling;
}
},
/**
* Process an "ss" directive to load and install a new stylesheet onto the application.
*
* @param {Element} ssElement the directive element
*/
_processStyleSheet: function(ssElement) {
var styleSheet = Echo.Serial.loadStyleSheet(this.client, ssElement);
this.client.application.setStyleSheet(styleSheet);
},
/**
* Process an "up" directive to update properties and/or add children to a component.
*
* @param {Element} upElement the directive element
*/
_processUpdate: function(upElement) {
// Determine parent component
var parentComponent;
if (upElement.getAttribute("r") == "true") {
parentComponent = this.client.application.rootComponent;
} else {
var parentId = upElement.getAttribute("i");
parentComponent = this.client.application.getComponentByRenderId(parentId);
}
// Child insertion cursor index (if index is omitted, children are added at this position).
var cursorIndex = 0;
var element = upElement.firstChild;
while (element) {
if (element.nodeType == 1) {
switch (element.nodeName) {
case "c": // Added child
var component = Echo.Serial.loadComponent(this.client, element, this._propertyMap, this._styleMap);
var index = element.getAttribute("x");
if (index == null) {
// No index specified, add children at current insertion cursor position.
parentComponent.add(component, cursorIndex);
++cursorIndex;
} else {
// Index specified, add child at index, set insertion cursor position to index + 1.
index = parseInt(index, 10);
parentComponent.add(component, index);
cursorIndex = index + 1;
}
break;
case "p": // Property update
Echo.Serial.loadProperty(this.client, element, parentComponent, null, this._propertyMap);
break;
case "s": // Style name update
parentComponent.setStyleName(element.firstChild ? element.firstChild.nodeValue : null);
break;
case "sr": // Style reference update
if (element.firstChild) {
parentComponent.setStyle(this._styleMap ? this._styleMap[element.firstChild.nodeValue] : null);
} else {
parentComponent.setStyle(null);
}
break;
case "e": // Event update
var eventType = element.getAttribute("t");
if (element.getAttribute("v") == "true") {
this.client.removeComponentListener(parentComponent, eventType);
this.client.addComponentListener(parentComponent, eventType);
} else {
this.client.removeComponentListener(parentComponent, eventType);
}
break;
case "en": // Enabled state update
parentComponent.setEnabled(element.firstChild.nodeValue == "true");
break;
case "locale": // Locale update
parentComponent.setLocale(element.firstChild ? element.firstChild.nodeValue : null);
break;
case "dir": // Layout direction update
parentComponent.setLayoutDirection(element.firstChild ?
(element.firstChild.nodeValue == "rtl" ? Echo.LayoutDirection.RTL : Echo.LayoutDirection.LTR) : null);
break;
}
}
element = element.nextSibling;
}
}
});
