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// Copyright 2010 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview A MessageChannel decorator that wraps a deferred MessageChannel
* and enqueues messages and service registrations until that channel exists.
*
*/
goog.provide('goog.messaging.DeferredChannel');
goog.require('goog.Disposable');
goog.require('goog.async.Deferred');
goog.require('goog.messaging.MessageChannel'); // interface
/**
* Creates a new DeferredChannel, which wraps a deferred MessageChannel and
* enqueues messages to be sent once the wrapped channel is resolved.
*
* @param {!goog.async.Deferred} deferredChannel The underlying deferred
* MessageChannel.
* @constructor
* @extends {goog.Disposable}
* @implements {goog.messaging.MessageChannel}
*/
goog.messaging.DeferredChannel = function(deferredChannel) {
goog.base(this);
this.deferred_ = deferredChannel;
};
goog.inherits(goog.messaging.DeferredChannel, goog.Disposable);
/**
* Cancels the wrapped Deferred.
*/
goog.messaging.DeferredChannel.prototype.cancel = function() {
this.deferred_.cancel();
};
/** @override */
goog.messaging.DeferredChannel.prototype.connect = function(opt_connectCb) {
if (opt_connectCb) {
opt_connectCb();
}
};
/** @override */
goog.messaging.DeferredChannel.prototype.isConnected = function() {
return true;
};
/** @override */
goog.messaging.DeferredChannel.prototype.registerService = function(
serviceName, callback, opt_objectPayload) {
this.deferred_.addCallback(function(resolved) {
resolved.registerService(serviceName, callback, opt_objectPayload);
});
};
/** @override */
goog.messaging.DeferredChannel.prototype.registerDefaultService =
function(callback) {
this.deferred_.addCallback(function(resolved) {
resolved.registerDefaultService(callback);
});
};
/** @override */
goog.messaging.DeferredChannel.prototype.send = function(serviceName, payload) {
this.deferred_.addCallback(function(resolved) {
resolved.send(serviceName, payload);
});
};
/** @override */
goog.messaging.DeferredChannel.prototype.disposeInternal = function() {
this.cancel();
goog.base(this, 'disposeInternal');
};
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