michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "MessageChannel.h"
michael@0: #include "mozilla/Preferences.h"
michael@0: #include "mozilla/dom/MessageChannelBinding.h"
michael@0: #include "mozilla/dom/MessagePort.h"
michael@0: #include "nsContentUtils.h"
michael@0: #include "nsPIDOMWindow.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace dom {
michael@0: 
michael@0: NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_3(MessageChannel, mWindow, mPort1, mPort2)
michael@0: NS_IMPL_CYCLE_COLLECTING_ADDREF(MessageChannel)
michael@0: NS_IMPL_CYCLE_COLLECTING_RELEASE(MessageChannel)
michael@0: 
michael@0: NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MessageChannel)
michael@0:   NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
michael@0:   NS_INTERFACE_MAP_ENTRY(nsISupports)
michael@0: NS_INTERFACE_MAP_END
michael@0: 
michael@0: namespace {
michael@0:   bool gPrefInitialized = false;
michael@0:   bool gPrefEnabled = false;
michael@0: 
michael@0: }
michael@0: 
michael@0: 
michael@0: /* static */ bool
michael@0: MessageChannel::PrefEnabled()
michael@0: {
michael@0:   if (!gPrefInitialized) {
michael@0:     Preferences::AddBoolVarCache(&gPrefEnabled, "dom.messageChannel.enabled");
michael@0:     gPrefInitialized = true;
michael@0:   }
michael@0: 
michael@0:   return gPrefEnabled;
michael@0: }
michael@0: 
michael@0: MessageChannel::MessageChannel(nsPIDOMWindow* aWindow)
michael@0:   : mWindow(aWindow)
michael@0: {
michael@0:   MOZ_COUNT_CTOR(MessageChannel);
michael@0:   SetIsDOMBinding();
michael@0: 
michael@0:   mPort1 = new MessagePort(mWindow);
michael@0:   mPort2 = new MessagePort(mWindow);
michael@0: 
michael@0:   mPort1->Entangle(mPort2);
michael@0:   mPort2->Entangle(mPort1);
michael@0: }
michael@0: 
michael@0: MessageChannel::~MessageChannel()
michael@0: {
michael@0:   MOZ_COUNT_DTOR(MessageChannel);
michael@0: }
michael@0: 
michael@0: JSObject*
michael@0: MessageChannel::WrapObject(JSContext* aCx)
michael@0: {
michael@0:   return MessageChannelBinding::Wrap(aCx, this);
michael@0: }
michael@0: 
michael@0: /* static */ already_AddRefed<MessageChannel>
michael@0: MessageChannel::Constructor(const GlobalObject& aGlobal, ErrorResult& aRv)
michael@0: {
michael@0:   nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aGlobal.GetAsSupports());
michael@0:   if (!window) {
michael@0:     aRv.Throw(NS_ERROR_UNEXPECTED);
michael@0:     return nullptr;
michael@0:   }
michael@0: 
michael@0:   nsRefPtr<MessageChannel> channel = new MessageChannel(window);
michael@0:   return channel.forget();
michael@0: }
michael@0: 
michael@0: } // namespace dom
michael@0: } // namespace mozilla