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 "platform/heap/Handle.h"
38 #include "wtf/PassOwnPtr.h"
39 #include "wtf/PassRefPtr.h"
40 #include "wtf/RefPtr.h"
41 #include "wtf/Threading.h"
42 #include "wtf/text/WTFString.h"
47 class ResourceRequest;
48 class WorkerGlobalScope;
49 class WorkerLoaderProxy;
50 struct CrossThreadResourceResponseData;
51 struct CrossThreadResourceRequestData;
53 class WorkerThreadableLoader FINAL : public ThreadableLoader {
54 WTF_MAKE_FAST_ALLOCATED;
56 static void loadResourceSynchronously(WorkerGlobalScope&, const ResourceRequest&, ThreadableLoaderClient&, const ThreadableLoaderOptions&, const ResourceLoaderOptions&);
57 static PassRefPtr<WorkerThreadableLoader> create(WorkerGlobalScope& workerGlobalScope, PassRefPtr<ThreadableLoaderClientWrapper> clientWrapper, PassOwnPtr<ThreadableLoaderClient> clientBridge, const ResourceRequest& request, const ThreadableLoaderOptions& options, const ResourceLoaderOptions& resourceLoaderOptions)
59 return adoptRef(new WorkerThreadableLoader(workerGlobalScope, clientWrapper, clientBridge, request, options, resourceLoaderOptions));
62 virtual ~WorkerThreadableLoader();
64 virtual void overrideTimeout(unsigned long timeout) OVERRIDE;
66 virtual void cancel() OVERRIDE;
69 // Creates a loader on the main thread and bridges communication between
70 // the main thread and the worker context's thread where WorkerThreadableLoader runs.
72 // Regarding the bridge and lifetimes of items used in callbacks, there are a few cases:
74 // all cases. All tasks posted from the worker context's thread are ok because
75 // the last task posted always is "mainThreadDestroy", so MainThreadBridge is
76 // around for all tasks that use it on the main thread.
78 // case 1. worker.terminate is called.
79 // In this case, no more tasks are posted from the worker object's thread to the worker
80 // context's thread -- WorkerGlobalScopeProxy implementation enforces this.
82 // case 2. xhr gets aborted and the worker context continues running.
83 // The ThreadableLoaderClientWrapper has the underlying client cleared, so no more calls
84 // go through it. All tasks posted from the worker object's thread to the worker context's
85 // thread do "ThreadableLoaderClientWrapper::ref" (automatically inside of the cross thread copy
86 // done in createCrossThreadTask), so the ThreadableLoaderClientWrapper instance is there until all
87 // tasks are executed.
88 class MainThreadBridge FINAL : public ThreadableLoaderClient {
90 // All executed on the worker context's thread.
91 MainThreadBridge(PassRefPtr<ThreadableLoaderClientWrapper>, PassOwnPtr<ThreadableLoaderClient>, WorkerLoaderProxy&, const ResourceRequest&, const ThreadableLoaderOptions&, const ResourceLoaderOptions&, const String& outgoingReferrer);
92 void overrideTimeout(unsigned long timeoutMilliseconds);
97 // Executed on the worker context's thread.
98 void clearClientWrapper();
100 // All executed on the main thread.
101 static void mainThreadDestroy(ExecutionContext*, MainThreadBridge*);
102 virtual ~MainThreadBridge();
104 static void mainThreadCreateLoader(ExecutionContext*, MainThreadBridge*, PassOwnPtr<CrossThreadResourceRequestData>, ThreadableLoaderOptions, ResourceLoaderOptions, const String& outgoingReferrer);
105 static void mainThreadOverrideTimeout(ExecutionContext*, MainThreadBridge*, unsigned long timeoutMilliseconds);
106 static void mainThreadCancel(ExecutionContext*, MainThreadBridge*);
107 virtual void didSendData(unsigned long long bytesSent, unsigned long long totalBytesToBeSent) OVERRIDE;
108 virtual void didReceiveResponse(unsigned long identifier, const ResourceResponse&) OVERRIDE;
109 virtual void didReceiveData(const char*, int dataLength) OVERRIDE;
110 virtual void didDownloadData(int dataLength) OVERRIDE;
111 virtual void didReceiveCachedMetadata(const char*, int dataLength) OVERRIDE;
112 virtual void didFinishLoading(unsigned long identifier, double finishTime) OVERRIDE;
113 virtual void didFail(const ResourceError&) OVERRIDE;
114 virtual void didFailAccessControlCheck(const ResourceError&) OVERRIDE;
115 virtual void didFailRedirectCheck() OVERRIDE;
117 // Only to be used on the main thread.
118 RefPtr<ThreadableLoader> m_mainThreadLoader;
119 OwnPtr<ThreadableLoaderClient> m_clientBridge;
121 // ThreadableLoaderClientWrapper is to be used on the worker context thread.
122 // The ref counting is done on either thread.
123 RefPtr<ThreadableLoaderClientWrapper> m_workerClientWrapper;
125 // Used on the worker context thread.
126 WorkerLoaderProxy& m_loaderProxy;
129 WorkerThreadableLoader(WorkerGlobalScope&, PassRefPtr<ThreadableLoaderClientWrapper>, PassOwnPtr<ThreadableLoaderClient>, const ResourceRequest&, const ThreadableLoaderOptions&, const ResourceLoaderOptions&);
131 RefPtrWillBePersistent<WorkerGlobalScope> m_workerGlobalScope;
132 RefPtr<ThreadableLoaderClientWrapper> m_workerClientWrapper;
133 MainThreadBridge& m_bridge;
138 #endif // WorkerThreadableLoader_h