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Copyright (c) 2009, Yahoo! Inc. All rights reserved.
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Code licensed under the BSD License:
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http://developer.yahoo.net/yui/license.txt
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YUI.add('datasource-cache', function(Y) {
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* Extends DataSource with caching functionality.
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* @submodule datasource-cache
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* Adds cacheability to the DataSource Utility.
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* @class DataSourceCache
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var DataSourceCache = function() {
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DataSourceCache.superclass.constructor.apply(this, arguments);
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Y.mix(DataSourceCache, {
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* The namespace for the plugin. This will be the property on the host which
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* references the plugin instance.
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* @value "dataSourceCache"
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NAME: "dataSourceCache",
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/////////////////////////////////////////////////////////////////////////////
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// DataSourceCache Attributes
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/////////////////////////////////////////////////////////////////////////////
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Y.extend(DataSourceCache, Y.Cache, {
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* Internal init() handler.
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* @param config {Object} Config object.
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initializer: function(config) {
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this.doBefore("_defRequestFn", this._beforeDefRequestFn);
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this.doBefore("_defResponseFn", this._beforeDefResponseFn);
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* First look for cached response, then send request to live data.
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* @method _beforeDefRequestFn
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* @param e {Event.Facade} Event Facade with the following properties:
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* <dt>tId (Number)</dt> <dd>Unique transaction ID.</dd>
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* <dt>request (Object)</dt> <dd>The request.</dd>
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* <dt>callback (Object)</dt> <dd>The callback object.</dd>
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* <dt>cfg (Object)</dt> <dd>Configuration object.</dd>
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_beforeDefRequestFn: function(e) {
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// Is response already in the Cache?
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var entry = (this.retrieve(e.request)) || null;
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if(entry && entry.response) {
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this.get("host").fire("response", Y.mix({response: entry.response}, e));
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return new Y.Do.Halt("DataSourceCache plugin halted _defRequestFn");
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* Adds data to cache before returning data.
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* @method _beforeDefResponseFn
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* @param e {Event.Facade} Event Facade with the following properties:
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* <dt>tId (Number)</dt> <dd>Unique transaction ID.</dd>
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* <dt>request (Object)</dt> <dd>The request.</dd>
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* <dt>callback (Object)</dt> <dd>The callback object with the following properties:
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* <dt>success (Function)</dt> <dd>Success handler.</dd>
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* <dt>failure (Function)</dt> <dd>Failure handler.</dd>
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* <dt>data (Object)</dt> <dd>Raw data.</dd>
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* <dt>response (Object)</dt> <dd>Normalized response object with the following properties:
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* <dt>cached (Object)</dt> <dd>True when response is cached.</dd>
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* <dt>results (Object)</dt> <dd>Parsed results.</dd>
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* <dt>meta (Object)</dt> <dd>Parsed meta data.</dd>
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* <dt>error (Object)</dt> <dd>Error object.</dd>
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* <dt>cfg (Object)</dt> <dd>Configuration object.</dd>
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_beforeDefResponseFn: function(e) {
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// Add to Cache before returning
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if(e.response && !e.response.cached) {
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e.response.cached = true;
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this.add(e.request, e.response, (e.callback && e.callback.argument));
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Y.namespace('Plugin').DataSourceCache = DataSourceCache;
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}, '3.0.0' ,{requires:['datasource-local', 'cache']});