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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @fileoverview Generic callback manager.
*/
goog.provide('devtools.Callback');
/**
* Generic callback support as a singleton object.
* @constructor
*/
devtools.Callback = function() {
this.lastCallbackId_ = 1;
this.callbacks_ = {};
};
/**
* Assigns id to a callback.
* @param {Function} callback Callback to assign id to.
* @return {number} Callback id.
*/
devtools.Callback.prototype.wrap = function(callback) {
var callbackId = this.lastCallbackId_++;
this.callbacks_[callbackId] = callback || function() {};
return callbackId;
};
/**
* Executes callback with the given id.
* @param {callbackId} callbackId Id of a callback to call.
*/
devtools.Callback.prototype.processCallback = function(callbackId,
opt_vararg) {
var args = Array.prototype.slice.call(arguments, 1);
var callback = this.callbacks_[callbackId];
callback.apply(null, args);
delete this.callbacks_[callbackId];
};
/**
* @type {devtools.Callback} Callback support singleton.
* @private
*/
devtools.Callback.INSTANCE_ = new devtools.Callback();
devtools.Callback.wrap = goog.bind(
devtools.Callback.INSTANCE_.wrap,
devtools.Callback.INSTANCE_);
devtools.Callback.processCallback = goog.bind(
devtools.Callback.INSTANCE_.processCallback,
devtools.Callback.INSTANCE_);
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