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Struts example source code file (Deferred.js)

This example Struts source code file (Deferred.js) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Struts tags/keywords

deferred, deferred, error, error

The Struts Deferred.js source code

/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/



dojo.provide("dojo.Deferred");
dojo.require("dojo.lang.func");
dojo.Deferred = function (canceller) {
	this.chain = [];
	this.id = this._nextId();
	this.fired = -1;
	this.paused = 0;
	this.results = [null, null];
	this.canceller = canceller;
	this.silentlyCancelled = false;
};
dojo.lang.extend(dojo.Deferred, {getFunctionFromArgs:function () {
	var a = arguments;
	if ((a[0]) && (!a[1])) {
		if (dojo.lang.isFunction(a[0])) {
			return a[0];
		} else {
			if (dojo.lang.isString(a[0])) {
				return dj_global[a[0]];
			}
		}
	} else {
		if ((a[0]) && (a[1])) {
			return dojo.lang.hitch(a[0], a[1]);
		}
	}
	return null;
}, makeCalled:function () {
	var deferred = new dojo.Deferred();
	deferred.callback();
	return deferred;
}, repr:function () {
	var state;
	if (this.fired == -1) {
		state = "unfired";
	} else {
		if (this.fired == 0) {
			state = "success";
		} else {
			state = "error";
		}
	}
	return "Deferred(" + this.id + ", " + state + ")";
}, toString:dojo.lang.forward("repr"), _nextId:(function () {
	var n = 1;
	return function () {
		return n++;
	};
})(), cancel:function () {
	if (this.fired == -1) {
		if (this.canceller) {
			this.canceller(this);
		} else {
			this.silentlyCancelled = true;
		}
		if (this.fired == -1) {
			this.errback(new Error(this.repr()));
		}
	} else {
		if ((this.fired == 0) && (this.results[0] instanceof dojo.Deferred)) {
			this.results[0].cancel();
		}
	}
}, _pause:function () {
	this.paused++;
}, _unpause:function () {
	this.paused--;
	if ((this.paused == 0) && (this.fired >= 0)) {
		this._fire();
	}
}, _continue:function (res) {
	this._resback(res);
	this._unpause();
}, _resback:function (res) {
	this.fired = ((res instanceof Error) ? 1 : 0);
	this.results[this.fired] = res;
	this._fire();
}, _check:function () {
	if (this.fired != -1) {
		if (!this.silentlyCancelled) {
			dojo.raise("already called!");
		}
		this.silentlyCancelled = false;
		return;
	}
}, callback:function (res) {
	this._check();
	this._resback(res);
}, errback:function (res) {
	this._check();
	if (!(res instanceof Error)) {
		res = new Error(res);
	}
	this._resback(res);
}, addBoth:function (cb, cbfn) {
	var enclosed = this.getFunctionFromArgs(cb, cbfn);
	if (arguments.length > 2) {
		enclosed = dojo.lang.curryArguments(null, enclosed, arguments, 2);
	}
	return this.addCallbacks(enclosed, enclosed);
}, addCallback:function (cb, cbfn) {
	var enclosed = this.getFunctionFromArgs(cb, cbfn);
	if (arguments.length > 2) {
		enclosed = dojo.lang.curryArguments(null, enclosed, arguments, 2);
	}
	return this.addCallbacks(enclosed, null);
}, addErrback:function (cb, cbfn) {
	var enclosed = this.getFunctionFromArgs(cb, cbfn);
	if (arguments.length > 2) {
		enclosed = dojo.lang.curryArguments(null, enclosed, arguments, 2);
	}
	return this.addCallbacks(null, enclosed);
	return this.addCallbacks(null, cbfn);
}, addCallbacks:function (cb, eb) {
	this.chain.push([cb, eb]);
	if (this.fired >= 0) {
		this._fire();
	}
	return this;
}, _fire:function () {
	var chain = this.chain;
	var fired = this.fired;
	var res = this.results[fired];
	var self = this;
	var cb = null;
	while (chain.length > 0 && this.paused == 0) {
		var pair = chain.shift();
		var f = pair[fired];
		if (f == null) {
			continue;
		}
		try {
			res = f(res);
			fired = ((res instanceof Error) ? 1 : 0);
			if (res instanceof dojo.Deferred) {
				cb = function (res) {
					self._continue(res);
				};
				this._pause();
			}
		}
		catch (err) {
			fired = 1;
			res = err;
		}
	}
	this.fired = fired;
	this.results[fired] = res;
	if ((cb) && (this.paused)) {
		res.addBoth(cb);
	}
}});

Other Struts examples (source code examples)

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