2 * Copyright (C) 2009 Google Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 #ifndef WorkerThreadableLoader_h
32 #define WorkerThreadableLoader_h
34 #include "core/loader/ThreadableLoader.h"
35 #include "core/loader/ThreadableLoaderClient.h"
36 #include "core/loader/ThreadableLoaderClientWrapper.h"
37 #include "heap/Handle.h"
38 #include "wtf/PassOwnPtr.h"
39 #include "wtf/PassRefPtr.h"
40 #include "wtf/RefCounted.h"
41 #include "wtf/RefPtr.h"
42 #include "wtf/Threading.h"
43 #include "wtf/text/WTFString.h"
48 class ResourceRequest;
49 class WorkerGlobalScope;
50 class WorkerLoaderProxy;
51 struct CrossThreadResourceResponseData;
52 struct CrossThreadResourceRequestData;
54 class WorkerThreadableLoader FINAL : public RefCounted<WorkerThreadableLoader>, public ThreadableLoader {
55 WTF_MAKE_FAST_ALLOCATED;
57 static void loadResourceSynchronously(WorkerGlobalScope*, const ResourceRequest&, ThreadableLoaderClient&, const ThreadableLoaderOptions&);
58 static PassRefPtr<WorkerThreadableLoader> create(WorkerGlobalScope* workerGlobalScope, PassRefPtr<ThreadableLoaderClientWrapper> clientWrapper, PassOwnPtr<ThreadableLoaderClient> clientBridge, const ResourceRequest& request, const ThreadableLoaderOptions& options)
60 return adoptRef(new WorkerThreadableLoader(workerGlobalScope, clientWrapper, clientBridge, request, options));
63 virtual ~WorkerThreadableLoader();
65 virtual void cancel() OVERRIDE;
67 bool done() const { return m_workerClientWrapper->done(); }
69 using RefCounted<WorkerThreadableLoader>::ref;
70 using RefCounted<WorkerThreadableLoader>::deref;
73 virtual void refThreadableLoader() OVERRIDE { ref(); }
74 virtual void derefThreadableLoader() OVERRIDE { deref(); }
77 // Creates a loader on the main thread and bridges communication between
78 // the main thread and the worker context's thread where WorkerThreadableLoader runs.
80 // Regarding the bridge and lifetimes of items used in callbacks, there are a few cases:
82 // all cases. All tasks posted from the worker context's thread are ok because
83 // the last task posted always is "mainThreadDestroy", so MainThreadBridge is
84 // around for all tasks that use it on the main thread.
86 // case 1. worker.terminate is called.
87 // In this case, no more tasks are posted from the worker object's thread to the worker
88 // context's thread -- WorkerGlobalScopeProxy implementation enforces this.
90 // case 2. xhr gets aborted and the worker context continues running.
91 // The ThreadableLoaderClientWrapper has the underlying client cleared, so no more calls
92 // go through it. All tasks posted from the worker object's thread to the worker context's
93 // thread do "ThreadableLoaderClientWrapper::ref" (automatically inside of the cross thread copy
94 // done in createCallbackTask), so the ThreadableLoaderClientWrapper instance is there until all
95 // tasks are executed.
96 class MainThreadBridge FINAL : public ThreadableLoaderClient {
98 // All executed on the worker context's thread.
99 MainThreadBridge(PassRefPtr<ThreadableLoaderClientWrapper>, PassOwnPtr<ThreadableLoaderClient>, WorkerLoaderProxy&, const ResourceRequest&, const ThreadableLoaderOptions&, const String& outgoingReferrer);
104 // Executed on the worker context's thread.
105 void clearClientWrapper();
107 // All executed on the main thread.
108 static void mainThreadDestroy(ExecutionContext*, MainThreadBridge*);
109 virtual ~MainThreadBridge();
111 static void mainThreadCreateLoader(ExecutionContext*, MainThreadBridge*, PassOwnPtr<CrossThreadResourceRequestData>, ThreadableLoaderOptions, const String& outgoingReferrer);
112 static void mainThreadCancel(ExecutionContext*, MainThreadBridge*);
113 virtual void didSendData(unsigned long long bytesSent, unsigned long long totalBytesToBeSent) OVERRIDE;
114 virtual void didReceiveResponse(unsigned long identifier, const ResourceResponse&) OVERRIDE;
115 virtual void didReceiveData(const char*, int dataLength) OVERRIDE;
116 virtual void didDownloadData(int dataLength) OVERRIDE;
117 virtual void didReceiveCachedMetadata(const char*, int dataLength) OVERRIDE;
118 virtual void didFinishLoading(unsigned long identifier, double finishTime) OVERRIDE;
119 virtual void didFail(const ResourceError&) OVERRIDE;
120 virtual void didFailAccessControlCheck(const ResourceError&) OVERRIDE;
121 virtual void didFailRedirectCheck() OVERRIDE;
123 // Only to be used on the main thread.
124 RefPtr<ThreadableLoader> m_mainThreadLoader;
125 OwnPtr<ThreadableLoaderClient> m_clientBridge;
127 // ThreadableLoaderClientWrapper is to be used on the worker context thread.
128 // The ref counting is done on either thread.
129 RefPtr<ThreadableLoaderClientWrapper> m_workerClientWrapper;
131 // Used on the worker context thread.
132 WorkerLoaderProxy& m_loaderProxy;
135 WorkerThreadableLoader(WorkerGlobalScope*, PassRefPtr<ThreadableLoaderClientWrapper>, PassOwnPtr<ThreadableLoaderClient>, const ResourceRequest&, const ThreadableLoaderOptions&);
137 RefPtrWillBePersistent<WorkerGlobalScope> m_workerGlobalScope;
138 RefPtr<ThreadableLoaderClientWrapper> m_workerClientWrapper;
139 MainThreadBridge& m_bridge;
142 } // namespace WebCore
144 #endif // WorkerThreadableLoader_h