gecko/ipc/glue/AsyncChannel.h

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