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