dojo_app/js/library/dijit/tests/_data/SlowStore.js

define(["dojo/_base/declare", "dojo/data/ItemFileReadStore"], function(declare, ItemFileReadStore){

	return declare("dijit.tests._data.SlowStore", ItemFileReadStore, {
		// summary:
		//		This wrapper decorates an ItemFileReadStore by delaying queries issued according to the
		//		length of the query:
		//
		//		- empty query: 2000ms,
		//		- 1 or 2 characters: 1000ms,
		//		- 3 characters: 500ms,
		//		- 4 or more characters: 100ms.

		constructor: function(){
			this.log = [];
		},

		fetch: function(/* Object */ keywordArgs){
			// Get the query phrase (store into first), and the # of chars it has
			var count = 0;
			var first;
			if("query" in keywordArgs){
				var query = keywordArgs.query;
				for(var attr in query){
					first = query[attr];
					break;
				}
				count = first.toString().length;
			}

			var delay = 100;
			switch(count || 0){
				case 0:
					delay = 2000;
					break;
				case 1:
				case 2:
					delay = 1000;
					break;
				case 3:
					delay = 500;
					break;
				case 4:
					delay = 100;
					break;
			}

			this.log.push({
				type: "start",
				date: new Date(),
				query: query,
				count: count,
				delay: delay
			});
			console.log("START query on " + (first || "{}") + " (" + count + " chars), delay = " + delay);

			var that = this,
				thatArgs = arguments;
			var handle = setTimeout(function(){
				that.log.push({
					type: "end",
					date: new Date(),
					query: query,
					count: count,
					delay: delay
				});
				console.log("END query on " + (first || "{}") + " (" + count + " chars), delay = " + delay);
				ItemFileReadStore.prototype.fetch.apply(that, thatArgs);
			}, delay);

			// This abort() method cancels a request before it has even been sent to ItemFileReadStore.
			// (Since ItemFileReadStore has already loaded the data (as per code in the test file),
			// it operates synchronously; there is never a case to send the cancel request to that object)
			keywordArgs.abort = function(){
				clearTimeout(handle);
				that.log.push({
					type: "cancel",
					date: new Date(),
					query: query,
					count: count,
					delay: delay
				});
				console.log("CANCEL query on " + (first || "{}") + " (" + count + " chars), delay = " + delay);
			};

			return keywordArgs;
		}
	});

});