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86 lines
2.3 KiB
JavaScript
86 lines
2.3 KiB
JavaScript
define("dojo/promise/tracer", [
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"../_base/lang",
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"./Promise",
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"../Evented"
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], function(lang, Promise, Evented){
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"use strict";
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// module:
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// dojo/promise/tracer
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/*=====
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return {
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// summary:
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// Trace promise fulfillment.
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// description:
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// Trace promise fulfillment. Calling `.trace()` or `.traceError()` on a
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// promise enables tracing. Will emit `resolved`, `rejected` or `progress`
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// events.
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on: function(type, listener){
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// summary:
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// Subscribe to traces.
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// description:
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// See `dojo/Evented#on()`.
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// type: String
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// `resolved`, `rejected`, or `progress`
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// listener: Function
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// The listener is passed the traced value and any arguments
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// that were used with the `.trace()` call.
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}
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};
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=====*/
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var evented = new Evented;
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var emit = evented.emit;
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evented.emit = null;
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// Emit events asynchronously since they should not change the promise state.
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function emitAsync(args){
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setTimeout(function(){
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emit.apply(evented, args);
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}, 0);
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}
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Promise.prototype.trace = function(){
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// summary:
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// Trace the promise.
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// description:
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// Tracing allows you to transparently log progress,
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// resolution and rejection of promises, without affecting the
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// promise itself. Any arguments passed to `trace()` are
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// emitted in trace events. See `dojo/promise/tracer` on how
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// to handle traces.
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// returns: dojo/promise/Promise
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// The promise instance `trace()` is called on.
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var args = lang._toArray(arguments);
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this.then(
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function(value){ emitAsync(["resolved", value].concat(args)); },
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function(error){ emitAsync(["rejected", error].concat(args)); },
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function(update){ emitAsync(["progress", update].concat(args)); }
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);
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return this;
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};
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Promise.prototype.traceRejected = function(){
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// summary:
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// Trace rejection of the promise.
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// description:
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// Tracing allows you to transparently log progress,
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// resolution and rejection of promises, without affecting the
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// promise itself. Any arguments passed to `trace()` are
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// emitted in trace events. See `dojo/promise/tracer` on how
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// to handle traces.
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// returns: dojo/promise/Promise
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// The promise instance `traceRejected()` is called on.
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var args = lang._toArray(arguments);
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this.otherwise(function(error){
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emitAsync(["rejected", error].concat(args));
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});
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return this;
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};
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return evented;
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});
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