Source/WebKit/Platform/IPC/MessageReceiver.h

/*
 * Copyright (C) 2012 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include <wtf/Assertions.h>

namespace IPC {

class Connection;
class Decoder;
class Encoder;

class MessageReceiver {
public:
    virtual ~MessageReceiver()
    {
        ASSERT(!m_messageReceiverMapCount);
    }

    virtual void didReceiveMessage(Connection&, Decoder&) = 0;
    virtual void didReceiveSyncMessage(Connection&, Decoder&, std::unique_ptr<Encoder>&)
    {
        ASSERT_NOT_REACHED();
    }

private:
    friend class MessageReceiverMap;

    void willBeAddedToMessageReceiverMap()
    {
#if !ASSERT_DISABLED
        m_messageReceiverMapCount++;
#endif
    }

    void willBeRemovedFromMessageReceiverMap()
    {
        ASSERT(m_messageReceiverMapCount);
#if !ASSERT_DISABLED
        m_messageReceiverMapCount--;
#endif
    }

#if !ASSERT_DISABLED
    unsigned m_messageReceiverMapCount { 0 };
#endif
};

} // namespace IPC