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/*
* Copyright (C) 2010 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 WorkerFileSystemCallbacksBridge_h
#define WorkerFileSystemCallbacksBridge_h
#if ENABLE(FILE_SYSTEM)
#include "PlatformString.h"
#include "ScriptExecutionContext.h"
#include "WebFileError.h"
#include "WebFileSystem.h"
#include "WebVector.h"
#include "WorkerContext.h"
#include <wtf/PassOwnPtr.h>
#include <wtf/PassRefPtr.h>
#include <wtf/Threading.h>
namespace WebKit {
class AsyncFileSystem;
class MainThreadFileSystemCallbacks;
class ThreadableCallbacksBridgeWrapper;
class WebCommonWorkerClient;
class WebFileSystemCallbacks;
class WebWorkerBase;
struct WebFileInfo;
struct WebFileSystemEntry;
// This class is used to post a openFileSystem request to the main thread and get called back for the request. This must be destructed on the worker thread.
//
// A typical flow for openFileSystem would look like this:
// Bridge::postOpenFileSystemToMainThread() on WorkerThread
// --> Bridge::openFileSystemOnMainThread() is called on MainThread
// This makes an IPC with a MainThreadFileSystemCallbacks instance
// [actual operation is down in the browser]
// --> MainThreadFileSystemCallbacks::didXxx is called on MainThread
// --> Bridge::didXxxOnMainThread is called on MainThread
// --> Bridge::didXxxOnWorkerThread is called on WorkerThread
// This calls the original callbacks (m_callbacksOnWorkerThread) and
// releases a self-reference to the bridge.
class WorkerFileSystemCallbacksBridge : public ThreadSafeShared<WorkerFileSystemCallbacksBridge>, public WebCore::WorkerContext::Observer {
public:
static PassRefPtr<WorkerFileSystemCallbacksBridge> create(WebWorkerBase* worker, WebCore::ScriptExecutionContext* workerContext, WebFileSystemCallbacks* callbacks)
{
return WTF::adoptRef(new WorkerFileSystemCallbacksBridge(worker, workerContext, callbacks));
}
~WorkerFileSystemCallbacksBridge();
// WorkerContext::Observer method.
virtual void notifyStop()
{
stop();
}
void stop();
// Posts an initial request task to the main thread. It is supposed to be called immediately after the bridge is constructed. (It doesn't check if the context has been stopped or not.)
void postOpenFileSystemToMainThread(WebCommonWorkerClient*, WebFileSystem::Type, long long size, const String& mode);
// Callback methods that are called on the main thread.
void didFailOnMainThread(WebFileError, const String& mode);
void didOpenFileSystemOnMainThread(const String& name, const String& rootPath, const String& mode);
private:
WorkerFileSystemCallbacksBridge(WebWorkerBase*, WebCore::ScriptExecutionContext*, WebFileSystemCallbacks*);
// Method that is to be called on the main thread.
static void openFileSystemOnMainThread(WebCore::ScriptExecutionContext*, WebCommonWorkerClient*, WebFileSystem::Type, long long size, WorkerFileSystemCallbacksBridge*, const String& mode);
friend class MainThreadFileSystemCallbacks;
// Methods that dispatch WebFileSystemCallbacks on the worker threads.
// They release a selfRef of the WorkerFileSystemCallbacksBridge.
static void didFailOnWorkerThread(WebCore::ScriptExecutionContext*, PassRefPtr<WorkerFileSystemCallbacksBridge>, WebFileError);
static void didOpenFileSystemOnWorkerThread(WebCore::ScriptExecutionContext*, PassRefPtr<WorkerFileSystemCallbacksBridge>, const String& name, const String& rootPath);
void mayPostTaskToWorker(PassOwnPtr<WebCore::ScriptExecutionContext::Task>, const String& mode);
// m_selfRef keeps a reference to itself until a task is created for the worker thread (at which point the task holds the reference).
RefPtr<WorkerFileSystemCallbacksBridge> m_selfRef;
Mutex m_mutex;
WebWorkerBase* m_worker;
WebCore::ScriptExecutionContext* m_workerContext;
// This is self-destructed and must be fired on the worker thread.
WebFileSystemCallbacks* m_callbacksOnWorkerThread;
};
} // namespace WebCore
#endif
#endif // WorkerFileSystemCallbacksBridge_h
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