gecko-dev/ipc/glue/ProtocolUtils.h

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
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 * the License. You may obtain a copy of the License at
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 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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 * 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.
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 *
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#ifndef mozilla_ipc_ProtocolUtils_h
#define mozilla_ipc_ProtocolUtils_h 1

#include "chrome/common/ipc_message_utils.h"

#include "mozilla/ipc/RPCChannel.h"

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;
};


template<class ListenerT>
class /*NS_INTERFACE_CLASS*/ IProtocolManager
{
public:
    virtual int32 Register(ListenerT*) = 0;
    virtual int32 RegisterID(ListenerT*, int32) = 0;
    virtual ListenerT* Lookup(int32) = 0;
    virtual void Unregister(int32) = 0;
};

} // 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