YUI Library Examples: DataSource Utility: DataSource with Offline Cache

YUI().use("datasource-get", "datasource-jsonschema", "datasource-cache", "cache-offline", function(Y) {
    var source = "remote source",
        myDataSource = new Y.DataSource.Get({
            source:"http://query.yahooapis.com/v1/public/yql?format=json&"}),
        callback = {
            success: function(e){
                alert(e.response);
            },
            failure: function(e){
                alert("Could not retrieve data: " + e.error.message);
            }
        };
 
    myDataSource.plug(Y.Plugin.DataSourceJSONSchema, {
        schema: {
            resultListLocator: "query.results.result",
            resultFields: ["title"]
        }
    });
 
    // Enable offline data caching by pointing to Y.CacheOffline.
    // For demonstration purposes, data is set to expire after 5 seconds
    myDataSource.plug(Y.Plugin.DataSourceCache,
        {cache: Y.CacheOffline, expires:5000});
 
    // Retrieves from server. Adds to cache
    myDataSource.sendRequest({
        request:"q=select%20*%20from%20search.web%20where%20query%3D%22foo%22",
        callback:callback
    });
    // Retrieves from server. Adds to cache
    myDataSource.sendRequest({
        request:"q=select%20*%20from%20search.web%20where%20query%3D%22bar%22",
        callback:callback
    });
    // Retrieves from cache
    myDataSource.sendRequest({
        request:"q=select%20*%20from%20search.web%20where%20query%3D%22foo%22",
        callback:callback
    });
 
    // ... wait 5 seconds ...
 
    // Cached data has expired. Retrieves from server. Adds to cache.
    myDataSource.sendRequest({
        request:"q=select%20*%20from%20search.web%20where%20query%3D%22foo%22",
        callback:callback
    });
});