gecko/ipc/glue/ProtocolUtils.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 IPC.
*
* 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 mozilla_ipc_ProtocolUtils_h
#define mozilla_ipc_ProtocolUtils_h 1
#include "base/process.h"
#include "base/process_util.h"
#include "chrome/common/ipc_message_utils.h"
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#include "prenv.h"
#include "mozilla/ipc/Shmem.h"
// WARNING: this takes into account the private, special-message-type
// enum in ipc_channel.h. They need to be kept in sync.
namespace {
enum {
SHMEM_DESTROYED_MESSAGE_TYPE = kuint16max - 5,
UNBLOCK_CHILD_MESSAGE_TYPE = kuint16max - 4,
BLOCK_CHILD_MESSAGE_TYPE = kuint16max - 3,
SHMEM_CREATED_MESSAGE_TYPE = kuint16max - 2,
GOODBYE_MESSAGE_TYPE = kuint16max - 1,
};
}
namespace mozilla {
namespace ipc {
// Used to pass references to protocol actors across the wire.
// Actors created on the parent-side have a positive ID, and actors
// allocated on the child side have a negative ID.
struct ActorHandle
{
int mId;
};
// Used internally to represent a "trigger" that might cause a state
// transition. Triggers are normalized across parent+child to Send
// and Recv (instead of child-in, child-out, parent-in, parent-out) so
// that they can share the same state machine implementation. To
// further normalize, |Send| is used for 'call', |Recv| for 'answer'.
struct Trigger
{
enum Action { Send, Recv };
Trigger(Action action, int32 msg) :
mAction(action),
mMsg(msg)
{}
Action mAction;
int32 mMsg;
};
template<class ListenerT>
class /*NS_INTERFACE_CLASS*/ IProtocolManager
{
public:
enum ActorDestroyReason {
FailedConstructor,
Deletion,
AncestorDeletion,
NormalShutdown,
AbnormalShutdown
};
typedef base::ProcessHandle ProcessHandle;
virtual int32 Register(ListenerT*) = 0;
virtual int32 RegisterID(ListenerT*, int32) = 0;
virtual ListenerT* Lookup(int32) = 0;
virtual void Unregister(int32) = 0;
virtual void RemoveManagee(int32, ListenerT*) = 0;
virtual Shmem::SharedMemory* CreateSharedMemory(
size_t, SharedMemory::SharedMemoryType, bool, int32*) = 0;
virtual bool AdoptSharedMemory(Shmem::SharedMemory*, int32*) = 0;
virtual Shmem::SharedMemory* LookupSharedMemory(int32) = 0;
virtual bool IsTrackingSharedMemory(Shmem::SharedMemory*) = 0;
virtual bool DestroySharedMemory(Shmem&) = 0;
// XXX odd duck, acknowledged
virtual ProcessHandle OtherProcess() const = 0;
};
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inline bool
LoggingEnabled()
{
#if defined(DEBUG)
return !!PR_GetEnv("MOZ_IPC_MESSAGE_LOG");
#else
return false;
#endif
}
} // namespace ipc
} // namespace mozilla
namespace IPC {
template <>
struct ParamTraits<mozilla::ipc::ActorHandle>
{
typedef mozilla::ipc::ActorHandle paramType;
static void Write(Message* aMsg, const paramType& aParam)
{
IPC::WriteParam(aMsg, aParam.mId);
}
static bool Read(const Message* aMsg, void** aIter, paramType* aResult)
{
int id;
if (IPC::ReadParam(aMsg, aIter, &id)) {
aResult->mId = id;
return true;
}
return false;
}
static void Log(const paramType& aParam, std::wstring* aLog)
{
aLog->append(StringPrintf(L"(%d)", aParam.mId));
}
};
} // namespace IPC
#endif // mozilla_ipc_ProtocolUtils_h