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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 ThreadSafeRefCounted<WorkerFileSystemCallbacksBridge>, public WebCore::WorkerContext::Observer {
public:
~WorkerFileSystemCallbacksBridge();
// WorkerContext::Observer method.
virtual void notifyStop()
{
stop();
}
void stop();
static PassRefPtr<WorkerFileSystemCallbacksBridge> create(WebWorkerBase* worker, WebCore::ScriptExecutionContext* workerContext, WebFileSystemCallbacks* callbacks)
{
return adoptRef(new WorkerFileSystemCallbacksBridge(worker, workerContext, callbacks));
}
// Methods that create an instance and post an initial request task to the main thread. They must be called on the worker thread.
void postOpenFileSystemToMainThread(WebCommonWorkerClient*, WebFileSystem::Type, long long size, bool create, const String& mode);
void postMoveToMainThread(WebFileSystem*, const String& srcPath, const String& destPath, const String& mode);
void postCopyToMainThread(WebFileSystem*, const String& srcPath, const String& destPath, const String& mode);
void postRemoveToMainThread(WebFileSystem*, const String& path, const String& mode);
void postRemoveRecursivelyToMainThread(WebFileSystem*, const String& path, const String& mode);
void postReadMetadataToMainThread(WebFileSystem*, const String& path, const String& mode);
void postCreateFileToMainThread(WebFileSystem*, const String& path, bool exclusive, const String& mode);
void postCreateDirectoryToMainThread(WebFileSystem*, const String& path, bool exclusive, const String& mode);
void postFileExistsToMainThread(WebFileSystem*, const String& path, const String& mode);
void postDirectoryExistsToMainThread(WebFileSystem*, const String& path, const String& mode);
void postReadDirectoryToMainThread(WebFileSystem*, const String& path, 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);
void didSucceedOnMainThread(const String& mode);
void didReadMetadataOnMainThread(const WebFileInfo&, const String& mode);
void didReadDirectoryOnMainThread(const WebVector<WebFileSystemEntry>&, bool hasMore, const String& mode);
private:
WorkerFileSystemCallbacksBridge(WebWorkerBase*, WebCore::ScriptExecutionContext*, WebFileSystemCallbacks*);
// Methods that are to be called on the main thread.
static void openFileSystemOnMainThread(WebCore::ScriptExecutionContext*, WebCommonWorkerClient*, WebFileSystem::Type, long long size, bool create, WorkerFileSystemCallbacksBridge*, const String& mode);
static void moveOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& srcPath, const String& destPath, WorkerFileSystemCallbacksBridge*, const String& mode);
static void copyOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& srcPath, const String& destPath, WorkerFileSystemCallbacksBridge*, const String& mode);
static void removeOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& path, WorkerFileSystemCallbacksBridge*, const String& mode);
static void removeRecursivelyOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& path, WorkerFileSystemCallbacksBridge*, const String& mode);
static void readMetadataOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& path, WorkerFileSystemCallbacksBridge*, const String& mode);
static void createFileOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& path, bool exclusive, WorkerFileSystemCallbacksBridge*, const String& mode);
static void createDirectoryOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& path, bool exclusive, WorkerFileSystemCallbacksBridge*, const String& mode);
static void fileExistsOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& path, WorkerFileSystemCallbacksBridge*, const String& mode);
static void directoryExistsOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& path, WorkerFileSystemCallbacksBridge*, const String& mode);
static void readDirectoryOnMainThread(WebCore::ScriptExecutionContext*, WebFileSystem*, const String& path, 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*, WorkerFileSystemCallbacksBridge*, WebFileError);
static void didOpenFileSystemOnWorkerThread(WebCore::ScriptExecutionContext*, WorkerFileSystemCallbacksBridge*, const String& name, const String& rootPath);
static void didSucceedOnWorkerThread(WebCore::ScriptExecutionContext*, WorkerFileSystemCallbacksBridge*);
static void didReadMetadataOnWorkerThread(WebCore::ScriptExecutionContext*, WorkerFileSystemCallbacksBridge*, const WebFileInfo&);
static void didReadDirectoryOnWorkerThread(WebCore::ScriptExecutionContext*, WorkerFileSystemCallbacksBridge*, const WebVector<WebFileSystemEntry>&, bool hasMore);
// For early-exist; this deref's selfRef and returns true if the worker is already null.
bool derefIfWorkerIsStopped();
static void runTaskOnMainThread(WebCore::ScriptExecutionContext*, WorkerFileSystemCallbacksBridge*, PassOwnPtr<WebCore::ScriptExecutionContext::Task>);
static void runTaskOnWorkerThread(WebCore::ScriptExecutionContext*, PassRefPtr<WorkerFileSystemCallbacksBridge>, PassOwnPtr<WebCore::ScriptExecutionContext::Task>);
void dispatchTaskToMainThread(PassOwnPtr<WebCore::ScriptExecutionContext::Task>);
void mayPostTaskToWorker(PassOwnPtr<WebCore::ScriptExecutionContext::Task>, const String& mode);
// m_selfRef keeps a reference to itself while there's a pending callback on the main thread.
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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