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// Copyright 2014 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.
define('async_waiter', [
'mojo/public/js/support',
], function(supportModule) {
/**
* @module async_waiter
*/
/**
* @callback module:async_waiter.AsyncWaiter.Callback
* @param {number} result The result of waiting.
*/
/**
* A waiter that waits for a handle to be ready for either reading or writing.
* @param {!MojoHandle} handle The handle to wait on.
* @param {number} signals The signals to wait for handle to be ready for.
* @param {module:async_waiter.AsyncWaiter.Callback} callback The callback to
* call when handle is ready.
* @constructor
* @alias module:async_waiter.AsyncWaiter
*/
function AsyncWaiter(handle, signals, callback) {
/**
* The handle to wait on.
* @type {!MojoHandle}
* @private
*/
this.handle_ = handle;
/**
* The signals to wait for.
* @type {number}
* @private
*/
this.signals_ = signals;
/**
* The callback to invoke when
* |[handle_]{@link module:async_waiter.AsyncWaiter#handle_}| is ready.
* @type {module:async_waiter.AsyncWaiter.Callback}
* @private
*/
this.callback_ = callback;
this.id_ = null;
}
/**
* Start waiting for the handle to be ready.
* @throws Will throw if this is already waiting.
*/
AsyncWaiter.prototype.start = function() {
if (this.id_)
throw new Error('Already started');
this.id_ = supportModule.asyncWait(
this.handle_, this.signals_, this.onHandleReady_.bind(this));
};
/**
* Stop waiting for the handle to be ready.
*/
AsyncWaiter.prototype.stop = function() {
if (!this.id_)
return;
supportModule.cancelWait(this.id_);
this.id_ = null;
};
/**
* Returns whether this {@link AsyncWaiter} is waiting.
* @return {boolean} Whether this AsyncWaiter is waiting.
*/
AsyncWaiter.prototype.isWaiting = function() {
return !!this.id_;
};
/**
* Invoked when |[handle_]{@link module:async_waiter.AsyncWaiter#handle_}| is
* ready.
* @param {number} result The result of the wait.
* @private
*/
AsyncWaiter.prototype.onHandleReady_ = function(result) {
this.id_ = null;
this.callback_(result);
};
return {AsyncWaiter: AsyncWaiter};
});
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