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/*
* Copyright (C) 2009 Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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.
*/
#ifndef PlatformMessagePortChannel_h
#define PlatformMessagePortChannel_h
#include "MessagePortChannel.h"
#include <wtf/MessageQueue.h>
#include <wtf/PassRefPtr.h>
#include <wtf/Threading.h>
namespace WebCore {
class MessagePort;
// PlatformMessagePortChannel is a platform-dependent interface to the remote side of a message channel.
// This default implementation supports multiple threads running within a single process. Implementations for multi-process platforms should define these public APIs in their own platform-specific PlatformMessagePortChannel file.
// The goal of this implementation is to eliminate contention except when cloning or closing the port, so each side of the channel has its own separate mutex.
class PlatformMessagePortChannel : public ThreadSafeRefCounted<PlatformMessagePortChannel> {
public:
class EventData {
WTF_MAKE_NONCOPYABLE(EventData); WTF_MAKE_FAST_ALLOCATED;
public:
static PassOwnPtr<EventData> create(PassRefPtr<SerializedScriptValue>, PassOwnPtr<MessagePortChannelArray>);
PassRefPtr<SerializedScriptValue> message() { return m_message; }
PassOwnPtr<MessagePortChannelArray> channels() { return m_channels.release(); }
private:
EventData(PassRefPtr<SerializedScriptValue> message, PassOwnPtr<MessagePortChannelArray>);
RefPtr<SerializedScriptValue> m_message;
OwnPtr<MessagePortChannelArray> m_channels;
};
// Wrapper for MessageQueue that allows us to do thread safe sharing by two proxies.
class MessagePortQueue : public ThreadSafeRefCounted<MessagePortQueue> {
public:
static PassRefPtr<MessagePortQueue> create() { return adoptRef(new MessagePortQueue()); }
PassOwnPtr<PlatformMessagePortChannel::EventData> tryGetMessage()
{
return m_queue.tryGetMessage();
}
bool appendAndCheckEmpty(PassOwnPtr<PlatformMessagePortChannel::EventData> message)
{
return m_queue.appendAndCheckEmpty(message);
}
bool isEmpty()
{
return m_queue.isEmpty();
}
private:
MessagePortQueue() { }
MessageQueue<PlatformMessagePortChannel::EventData> m_queue;
};
~PlatformMessagePortChannel();
static PassRefPtr<PlatformMessagePortChannel> create(PassRefPtr<MessagePortQueue> incoming, PassRefPtr<MessagePortQueue> outgoing);
PlatformMessagePortChannel(PassRefPtr<MessagePortQueue> incoming, PassRefPtr<MessagePortQueue> outgoing);
PassRefPtr<PlatformMessagePortChannel> entangledChannel();
void setRemotePort(MessagePort*);
void closeInternal();
// Mutex used to ensure exclusive access to the object internals.
Mutex m_mutex;
// Pointer to our entangled pair - cleared when close() is called.
RefPtr<PlatformMessagePortChannel> m_entangledChannel;
// Reference to the message queue for the (local) entangled port.
RefPtr<MessagePortQueue> m_incomingQueue;
RefPtr<MessagePortQueue> m_outgoingQueue;
// The port we are connected to (the remote port) - this is the port that is notified when new messages arrive.
MessagePort* m_remotePort;
};
} // namespace WebCore
#endif // PlatformMessagePortChannel_h
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