author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 17 Sep 2010 09:02:29 +0300 | |
changeset 0 | 4f2f89ce4247 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (C) 2009 Google Inc. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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|
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#ifndef WorkerThreadableLoader_h |
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#define WorkerThreadableLoader_h |
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#if ENABLE(WORKERS) |
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#include "PlatformString.h" |
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#include "ThreadableLoader.h" |
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#include "ThreadableLoaderClient.h" |
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#include "ThreadableLoaderClientWrapper.h" |
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#include <wtf/PassOwnPtr.h> |
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#include <wtf/PassRefPtr.h> |
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#include <wtf/RefCounted.h> |
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#include <wtf/RefPtr.h> |
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#include <wtf/Threading.h> |
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namespace WebCore { |
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class ResourceError; |
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class ResourceRequest; |
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class WorkerContext; |
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class WorkerLoaderProxy; |
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struct CrossThreadResourceResponseData; |
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struct CrossThreadResourceRequestData; |
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class WorkerThreadableLoader : public RefCounted<WorkerThreadableLoader>, public ThreadableLoader { |
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public: |
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static void loadResourceSynchronously(WorkerContext*, const ResourceRequest&, ThreadableLoaderClient&, const ThreadableLoaderOptions&); |
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static PassRefPtr<WorkerThreadableLoader> create(WorkerContext* workerContext, ThreadableLoaderClient* client, const String& taskMode, const ResourceRequest& request, const ThreadableLoaderOptions& options) |
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{ |
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return adoptRef(new WorkerThreadableLoader(workerContext, client, taskMode, request, options)); |
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} |
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~WorkerThreadableLoader(); |
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virtual void cancel(); |
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bool done() const { return m_workerClientWrapper->done(); } |
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using RefCounted<WorkerThreadableLoader>::ref; |
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using RefCounted<WorkerThreadableLoader>::deref; |
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protected: |
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virtual void refThreadableLoader() { ref(); } |
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virtual void derefThreadableLoader() { deref(); } |
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private: |
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// Creates a loader on the main thread and bridges communication between |
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// the main thread and the worker context's thread where WorkerThreadableLoader runs. |
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// |
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// Regarding the bridge and lifetimes of items used in callbacks, there are a few cases: |
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// |
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// all cases. All tasks posted from the worker context's thread are ok because |
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// the last task posted always is "mainThreadDestroy", so MainThreadBridge is |
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// around for all tasks that use it on the main thread. |
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// |
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// case 1. worker.terminate is called. |
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// In this case, no more tasks are posted from the worker object's thread to the worker |
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// context's thread -- WorkerContextProxy implementation enforces this. |
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// |
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// case 2. xhr gets aborted and the worker context continues running. |
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// The ThreadableLoaderClientWrapper has the underlying client cleared, so no more calls |
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// go through it. All tasks posted from the worker object's thread to the worker context's |
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// thread do "ThreadableLoaderClientWrapper::ref" (automatically inside of the cross thread copy |
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// done in createCallbackTask), so the ThreadableLoaderClientWrapper instance is there until all |
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// tasks are executed. |
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class MainThreadBridge : public ThreadableLoaderClient { |
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public: |
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// All executed on the worker context's thread. |
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MainThreadBridge(PassRefPtr<ThreadableLoaderClientWrapper>, WorkerLoaderProxy&, const String& taskMode, const ResourceRequest&, const ThreadableLoaderOptions&); |
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void cancel(); |
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void destroy(); |
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private: |
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// Executed on the worker context's thread. |
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void clearClientWrapper(); |
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// All executed on the main thread. |
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static void mainThreadDestroy(ScriptExecutionContext*, MainThreadBridge*); |
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~MainThreadBridge(); |
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static void mainThreadCreateLoader(ScriptExecutionContext*, MainThreadBridge*, PassOwnPtr<CrossThreadResourceRequestData>, ThreadableLoaderOptions); |
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static void mainThreadCancel(ScriptExecutionContext*, MainThreadBridge*); |
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virtual void didSendData(unsigned long long bytesSent, unsigned long long totalBytesToBeSent); |
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virtual void didReceiveResponse(const ResourceResponse&); |
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virtual void didReceiveData(const char*, int lengthReceived); |
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virtual void didFinishLoading(unsigned long identifier); |
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virtual void didFail(const ResourceError&); |
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virtual void didFailRedirectCheck(); |
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virtual void didReceiveAuthenticationCancellation(const ResourceResponse&); |
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// Only to be used on the main thread. |
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RefPtr<ThreadableLoader> m_mainThreadLoader; |
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// ThreadableLoaderClientWrapper is to be used on the worker context thread. |
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// The ref counting is done on either thread. |
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RefPtr<ThreadableLoaderClientWrapper> m_workerClientWrapper; |
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// May be used on either thread. |
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WorkerLoaderProxy& m_loaderProxy; |
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// For use on the main thread. |
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String m_taskMode; |
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}; |
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WorkerThreadableLoader(WorkerContext*, ThreadableLoaderClient*, const String& taskMode, const ResourceRequest&, const ThreadableLoaderOptions&); |
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RefPtr<WorkerContext> m_workerContext; |
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RefPtr<ThreadableLoaderClientWrapper> m_workerClientWrapper; |
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MainThreadBridge& m_bridge; |
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}; |
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} // namespace WebCore |
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#endif // ENABLE(WORKERS) |
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#endif // WorkerThreadableLoader_h |