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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
* Copyright (C) 2010 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:
*
* * 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 FileStreamProxy_h
#define FileStreamProxy_h
#if ENABLE(BLOB) || ENABLE(FILE_WRITER)
#include <wtf/Forward.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
namespace WebCore {
class Blob;
class FileStream;
class FileStreamClient;
class FileThread;
class ScriptExecutionContext;
// A proxy module that asynchronously calls corresponding FileStream methods on the file thread. Note: you must call stop() first and then release the reference to destruct the FileStreamProxy instance.
class FileStreamProxy : public RefCounted<FileStreamProxy> {
public:
static PassRefPtr<FileStreamProxy> create(ScriptExecutionContext*, FileStreamClient*);
virtual ~FileStreamProxy();
void getSize(const String& path, double expectedModificationTime);
void openForRead(const String& path, long long offset, long long length);
void openForWrite(const String& path);
void close();
void read(char* buffer, int length);
void write(Blob*, long long position, int length);
void truncate(long long position);
// Stops the proxy and scedules it to be destructed. All the pending tasks will be aborted and the file stream will be closed.
// Note: the caller should deref the instance immediately after calling stop().
void stop();
FileStreamClient* client() const { return m_client; }
private:
FileStreamProxy(ScriptExecutionContext*, FileStreamClient*);
FileThread* fileThread();
// Called on File thread.
void startOnFileThread();
void stopOnFileThread();
void getSizeOnFileThread(const String& path, double expectedModificationTime);
void openForReadOnFileThread(const String& path, long long offset, long long length);
void openForWriteOnFileThread(const String& path);
void closeOnFileThread();
void readOnFileThread(char* buffer, int length);
void writeOnFileThread(Blob*, long long position, int length);
void truncateOnFileThread(long long position);
RefPtr<ScriptExecutionContext> m_context;
FileStreamClient* m_client;
RefPtr<FileStream> m_stream;
};
} // namespace WebCore
#endif // ENABLE(BLOB) || ENABLE(FILE_WRITER)
#endif // FileStreamProxy_h
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