/*
* Copyright (C) 2012 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:
* 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 COMPUTER, INC. ``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 COMPUTER, INC. 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 ThreadSafeDataTransport_h
#define ThreadSafeDataTransport_h
#include "platform/PlatformExport.h"
#include "wtf/OwnPtr.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/RefPtr.h"
#include "wtf/ThreadingPrimitives.h"
#include "wtf/Vector.h"
namespace WebCore {
class SharedBuffer;
// The purpose of this class is to allow the transfer of data stored in
// SharedBuffer in a thread-safe manner, and to minimize memory copies
// and thread contention.
//
// This class is designed such that there is only one producer and
// one consumer.
class PLATFORM_EXPORT ThreadSafeDataTransport {
public:
ThreadSafeDataTransport();
~ThreadSafeDataTransport();
// This method is being called subsequently with an expanding
// SharedBuffer.
void setData(SharedBuffer*, bool allDataReceived);
// Get the data submitted to this class so far.
void data(SharedBuffer**, bool* allDataReceived);
// Return true of there is new data submitted to this class
// since last time data() was called.
bool hasNewData();
private:
Mutex m_mutex;
Vector<RefPtr<SharedBuffer> > m_newBufferQueue;
RefPtr<SharedBuffer> m_readBuffer;
bool m_allDataReceived;
size_t m_readPosition;
};
} // namespace WebCore
#endif