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/*
* Copyright (C) 2009 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 WorkerThreadableLoader_h
#define WorkerThreadableLoader_h
#if ENABLE(WORKERS)
#include "PlatformString.h"
#include "ThreadableLoader.h"
#include "ThreadableLoaderClient.h"
#include "ThreadableLoaderClientWrapper.h"
#include <wtf/PassOwnPtr.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
#include <wtf/Threading.h>
namespace WebCore {
class ResourceError;
class ResourceRequest;
class WorkerContext;
class WorkerLoaderProxy;
struct CrossThreadResourceResponseData;
struct CrossThreadResourceRequestData;
class WorkerThreadableLoader : public RefCounted<WorkerThreadableLoader>, public ThreadableLoader {
WTF_MAKE_FAST_ALLOCATED;
public:
static void loadResourceSynchronously(WorkerContext*, const ResourceRequest&, ThreadableLoaderClient&, const ThreadableLoaderOptions&);
static PassRefPtr<WorkerThreadableLoader> create(WorkerContext* workerContext, ThreadableLoaderClient* client, const String& taskMode, const ResourceRequest& request, const ThreadableLoaderOptions& options)
{
return adoptRef(new WorkerThreadableLoader(workerContext, client, taskMode, request, options));
}
~WorkerThreadableLoader();
virtual void cancel();
bool done() const { return m_workerClientWrapper->done(); }
using RefCounted<WorkerThreadableLoader>::ref;
using RefCounted<WorkerThreadableLoader>::deref;
protected:
virtual void refThreadableLoader() { ref(); }
virtual void derefThreadableLoader() { deref(); }
private:
// Creates a loader on the main thread and bridges communication between
// the main thread and the worker context's thread where WorkerThreadableLoader runs.
//
// Regarding the bridge and lifetimes of items used in callbacks, there are a few cases:
//
// all cases. All tasks posted from the worker context's thread are ok because
// the last task posted always is "mainThreadDestroy", so MainThreadBridge is
// around for all tasks that use it on the main thread.
//
// case 1. worker.terminate is called.
// In this case, no more tasks are posted from the worker object's thread to the worker
// context's thread -- WorkerContextProxy implementation enforces this.
//
// case 2. xhr gets aborted and the worker context continues running.
// The ThreadableLoaderClientWrapper has the underlying client cleared, so no more calls
// go through it. All tasks posted from the worker object's thread to the worker context's
// thread do "ThreadableLoaderClientWrapper::ref" (automatically inside of the cross thread copy
// done in createCallbackTask), so the ThreadableLoaderClientWrapper instance is there until all
// tasks are executed.
class MainThreadBridge : public ThreadableLoaderClient {
public:
// All executed on the worker context's thread.
MainThreadBridge(PassRefPtr<ThreadableLoaderClientWrapper>, WorkerLoaderProxy&, const String& taskMode, const ResourceRequest&, const ThreadableLoaderOptions&);
void cancel();
void destroy();
private:
// Executed on the worker context's thread.
void clearClientWrapper();
// All executed on the main thread.
static void mainThreadDestroy(ScriptExecutionContext*, MainThreadBridge*);
~MainThreadBridge();
static void mainThreadCreateLoader(ScriptExecutionContext*, MainThreadBridge*, PassOwnPtr<CrossThreadResourceRequestData>, ThreadableLoaderOptions);
static void mainThreadCancel(ScriptExecutionContext*, MainThreadBridge*);
virtual void didSendData(unsigned long long bytesSent, unsigned long long totalBytesToBeSent);
virtual void didReceiveResponse(const ResourceResponse&);
virtual void didReceiveData(const char*, int lengthReceived);
virtual void didFinishLoading(unsigned long identifier);
virtual void didFail(const ResourceError&);
virtual void didFailRedirectCheck();
virtual void didReceiveAuthenticationCancellation(const ResourceResponse&);
// Only to be used on the main thread.
RefPtr<ThreadableLoader> m_mainThreadLoader;
// ThreadableLoaderClientWrapper is to be used on the worker context thread.
// The ref counting is done on either thread.
RefPtr<ThreadableLoaderClientWrapper> m_workerClientWrapper;
// May be used on either thread.
WorkerLoaderProxy& m_loaderProxy;
// For use on the main thread.
String m_taskMode;
};
WorkerThreadableLoader(WorkerContext*, ThreadableLoaderClient*, const String& taskMode, const ResourceRequest&, const ThreadableLoaderOptions&);
RefPtr<WorkerContext> m_workerContext;
RefPtr<ThreadableLoaderClientWrapper> m_workerClientWrapper;
MainThreadBridge& m_bridge;
};
} // namespace WebCore
#endif // ENABLE(WORKERS)
#endif // WorkerThreadableLoader_h
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