зеркало из https://github.com/mozilla/pjs.git
203 строки
6.3 KiB
C++
203 строки
6.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: sw=4 ts=4 et :
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*/
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Plugin App.
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*
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* The Initial Developer of the Original Code is
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* Chris Jones <jones.chris.g@gmail.com>
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef ipc_glue_AsyncChannel_h
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#define ipc_glue_AsyncChannel_h 1
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#include "base/basictypes.h"
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#include "base/message_loop.h"
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#include "chrome/common/ipc_channel.h"
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#include "mozilla/CondVar.h"
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#include "mozilla/Mutex.h"
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//-----------------------------------------------------------------------------
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namespace mozilla {
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namespace ipc {
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struct HasResultCodes
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{
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enum Result {
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MsgProcessed,
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MsgDropped,
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MsgNotKnown,
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MsgNotAllowed,
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MsgPayloadError,
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MsgProcessingError,
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MsgRouteError,
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MsgValueError,
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};
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};
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class AsyncChannel : public IPC::Channel::Listener, protected HasResultCodes
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{
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protected:
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typedef mozilla::CondVar CondVar;
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typedef mozilla::Mutex Mutex;
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enum ChannelState {
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ChannelClosed,
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ChannelOpening,
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ChannelConnected,
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ChannelTimeout,
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ChannelClosing,
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ChannelError
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};
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public:
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typedef IPC::Channel Transport;
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typedef IPC::Message Message;
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class /*NS_INTERFACE_CLASS*/ AsyncListener: protected HasResultCodes
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{
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public:
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virtual ~AsyncListener() { }
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virtual void OnChannelClose() = 0;
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virtual void OnChannelError() = 0;
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virtual Result OnMessageReceived(const Message& aMessage) = 0;
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virtual void OnProcessingError(Result aError) = 0;
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virtual void OnChannelConnected(int32 peer_pid) {};
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};
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public:
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//
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// These methods are called on the "worker" thread
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//
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AsyncChannel(AsyncListener* aListener);
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virtual ~AsyncChannel();
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// "Open" from the perspective of the transport layer; the underlying
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// socketpair/pipe should already be created.
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//
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// Returns true iff the transport layer was successfully connected,
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// i.e., mChannelState == ChannelConnected.
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bool Open(Transport* aTransport, MessageLoop* aIOLoop=0);
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// Close the underlying transport channel.
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void Close();
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// Asynchronously send a message to the other side of the channel
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virtual bool Send(Message* msg);
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// Send OnChannelConnected notification to listeners.
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void DispatchOnChannelConnected(int32 peer_pid);
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//
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// These methods are called on the "IO" thread
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//
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// Implement the IPC::Channel::Listener interface
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NS_OVERRIDE virtual void OnMessageReceived(const Message& msg);
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NS_OVERRIDE virtual void OnChannelConnected(int32 peer_pid);
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NS_OVERRIDE virtual void OnChannelError();
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protected:
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// Can be run on either thread
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void AssertWorkerThread() const
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{
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NS_ABORT_IF_FALSE(mWorkerLoop == MessageLoop::current(),
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"not on worker thread!");
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}
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void AssertIOThread() const
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{
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NS_ABORT_IF_FALSE(mIOLoop == MessageLoop::current(),
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"not on IO thread!");
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}
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bool Connected() const {
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mMutex.AssertCurrentThreadOwns();
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return ChannelConnected == mChannelState;
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}
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// Run on the worker thread
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void OnDispatchMessage(const Message& aMsg);
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virtual bool OnSpecialMessage(uint16 id, const Message& msg);
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void SendSpecialMessage(Message* msg) const;
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// Tell the IO thread to close the channel and wait for it to ACK.
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void SynchronouslyClose();
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bool MaybeHandleError(Result code, const char* channelName);
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void ReportConnectionError(const char* channelName) const;
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// Run on the worker thread
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void SendThroughTransport(Message* msg) const;
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void OnNotifyMaybeChannelError();
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virtual bool ShouldDeferNotifyMaybeError() const {
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return false;
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}
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void NotifyChannelClosed();
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void NotifyMaybeChannelError();
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virtual void Clear();
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// Run on the IO thread
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void OnChannelOpened();
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void OnCloseChannel();
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void PostErrorNotifyTask();
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// Return true if |msg| is a special message targeted at the IO
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// thread, in which case it shouldn't be delivered to the worker.
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bool MaybeInterceptSpecialIOMessage(const Message& msg);
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void ProcessGoodbyeMessage();
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Transport* mTransport;
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AsyncListener* mListener;
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ChannelState mChannelState;
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Mutex mMutex;
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CondVar mCvar;
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MessageLoop* mIOLoop; // thread where IO happens
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MessageLoop* mWorkerLoop; // thread where work is done
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bool mChild; // am I the child or parent?
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CancelableTask* mChannelErrorTask; // NotifyMaybeChannelError runnable
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IPC::Channel::Listener* mExistingListener; // channel's previous listener
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};
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} // namespace ipc
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} // namespace mozilla
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#endif // ifndef ipc_glue_AsyncChannel_h
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