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author | Feng Qian <> | 2009-04-10 18:11:29 -0700 |
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committer | The Android Open Source Project <initial-contribution@android.com> | 2009-04-10 18:11:29 -0700 |
commit | 8f72e70a9fd78eec56623b3a62e68f16b7b27e28 (patch) | |
tree | 181bf9a400c30a1bf34ea6d72560e8d00111d549 /WebCore/loader/WorkerThreadableLoader.h | |
parent | 7ed56f225e0ade046e1c2178977f72b2d896f196 (diff) | |
download | external_webkit-8f72e70a9fd78eec56623b3a62e68f16b7b27e28.zip external_webkit-8f72e70a9fd78eec56623b3a62e68f16b7b27e28.tar.gz external_webkit-8f72e70a9fd78eec56623b3a62e68f16b7b27e28.tar.bz2 |
AI 145796: Land the WebKit merge @r42026.
Automated import of CL 145796
Diffstat (limited to 'WebCore/loader/WorkerThreadableLoader.h')
-rw-r--r-- | WebCore/loader/WorkerThreadableLoader.h | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/WebCore/loader/WorkerThreadableLoader.h b/WebCore/loader/WorkerThreadableLoader.h new file mode 100644 index 0000000..5462a97 --- /dev/null +++ b/WebCore/loader/WorkerThreadableLoader.h @@ -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 <memory> +#include <wtf/PassRefPtr.h> +#include <wtf/RefCounted.h> +#include <wtf/RefPtr.h> +#include <wtf/Threading.h> + +namespace WebCore { + + class ResourceError; + struct ResourceRequest; + class WorkerContext; + class WorkerMessagingProxy; + struct CrossThreadResourceResponseData; + struct CrossThreadResourceRequestData; + + class WorkerThreadableLoader : public RefCounted<WorkerThreadableLoader>, public ThreadableLoader { + public: + static void loadResourceSynchronously(WorkerContext*, const ResourceRequest&, ThreadableLoaderClient&); + static PassRefPtr<WorkerThreadableLoader> create(WorkerContext* workerContext, ThreadableLoaderClient* client, const String& taskMode, const ResourceRequest& request, LoadCallbacks callbacksSetting, ContentSniff contentSniff) + { + return adoptRef(new WorkerThreadableLoader(workerContext, client, taskMode, request, callbacksSetting, contentSniff)); + } + + ~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 mian 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 -- WorkerMessagingProxy 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 : ThreadableLoaderClient { + public: + // All executed on the worker context's thread. + MainThreadBridge(PassRefPtr<ThreadableLoaderClientWrapper>, WorkerMessagingProxy&, const String& taskMode, const ResourceRequest&, LoadCallbacks, ContentSniff); + 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*, std::auto_ptr<CrossThreadResourceRequestData>, LoadCallbacks, ContentSniff); + 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<ThreadSafeShared<ThreadableLoaderClientWrapper> > m_workerClientWrapper; + + // May be used on either thread. + WorkerMessagingProxy& m_messagingProxy; + + // For use on the main thread. + String m_taskMode; + }; + + WorkerThreadableLoader(WorkerContext*, ThreadableLoaderClient*, const String& taskMode, const ResourceRequest&, LoadCallbacks, ContentSniff); + + RefPtr<WorkerContext> m_workerContext; + RefPtr<ThreadableLoaderClientWrapper> m_workerClientWrapper; + MainThreadBridge& m_bridge; + }; + +} // namespace WebCore + +#endif // ENABLE(WORKERS) + +#endif // WorkerThreadableLoader_h |