1/* 2 * Copyright (C) 2012 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef ThreadSafeDataTransport_h 27#define ThreadSafeDataTransport_h 28 29#include "platform/PlatformExport.h" 30#include "wtf/OwnPtr.h" 31#include "wtf/PassOwnPtr.h" 32#include "wtf/RefPtr.h" 33#include "wtf/ThreadingPrimitives.h" 34#include "wtf/Vector.h" 35 36namespace blink { 37 38class SharedBuffer; 39 40// The purpose of this class is to allow the transfer of data stored in 41// SharedBuffer in a thread-safe manner, and to minimize memory copies 42// and thread contention. 43// 44// This class is designed such that there is only one producer and 45// one consumer. 46class PLATFORM_EXPORT ThreadSafeDataTransport { 47public: 48 ThreadSafeDataTransport(); 49 ~ThreadSafeDataTransport(); 50 51 // This method is being called subsequently with an expanding 52 // SharedBuffer. 53 void setData(SharedBuffer*, bool allDataReceived); 54 55 // Get the data submitted to this class so far. 56 void data(SharedBuffer**, bool* allDataReceived); 57 58 // Return true of there is new data submitted to this class 59 // since last time data() was called. 60 bool hasNewData(); 61 62private: 63 Mutex m_mutex; 64 65 Vector<RefPtr<SharedBuffer> > m_newBufferQueue; 66 RefPtr<SharedBuffer> m_readBuffer; 67 bool m_allDataReceived; 68 size_t m_readPosition; 69}; 70 71} // namespace blink 72 73#endif 74