diff -r 000000000000 -r 4f2f89ce4247 WebCore/loader/WorkerThreadableLoader.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/WebCore/loader/WorkerThreadableLoader.h Fri Sep 17 09:02:29 2010 +0300 @@ -0,0 +1,147 @@ +/* + * 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 +#include +#include +#include +#include + +namespace WebCore { + + class ResourceError; + class ResourceRequest; + class WorkerContext; + class WorkerLoaderProxy; + struct CrossThreadResourceResponseData; + struct CrossThreadResourceRequestData; + + class WorkerThreadableLoader : public RefCounted, public ThreadableLoader { + public: + static void loadResourceSynchronously(WorkerContext*, const ResourceRequest&, ThreadableLoaderClient&, const ThreadableLoaderOptions&); + static PassRefPtr 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::ref; + using RefCounted::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, 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, 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 m_mainThreadLoader; + + // ThreadableLoaderClientWrapper is to be used on the worker context thread. + // The ref counting is done on either thread. + RefPtr 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 m_workerContext; + RefPtr m_workerClientWrapper; + MainThreadBridge& m_bridge; + }; + +} // namespace WebCore + +#endif // ENABLE(WORKERS) + +#endif // WorkerThreadableLoader_h