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/*
* 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
#include "core/loader/ThreadableLoader.h"
#include "core/loader/ThreadableLoaderClient.h"
#include "core/loader/ThreadableLoaderClientWrapper.h"
#include "platform/heap/Handle.h"
#include "platform/weborigin/Referrer.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefPtr.h"
#include "wtf/Threading.h"
#include "wtf/text/WTFString.h"
namespace blink {
class ResourceError;
class ResourceRequest;
class WorkerGlobalScope;
class WorkerLoaderProxy;
struct CrossThreadResourceRequestData;
class WorkerThreadableLoader final : public ThreadableLoader, private ThreadableLoaderClientWrapper::ResourceTimingClient {
USING_FAST_MALLOC(WorkerThreadableLoader);
public:
static void loadResourceSynchronously(WorkerGlobalScope&, const ResourceRequest&, ThreadableLoaderClient&, const ThreadableLoaderOptions&, const ResourceLoaderOptions&);
static PassRefPtr<WorkerThreadableLoader> create(WorkerGlobalScope& workerGlobalScope, PassRefPtr<ThreadableLoaderClientWrapper> clientWrapper, PassOwnPtr<ThreadableLoaderClient> clientBridge, const ResourceRequest& request, const ThreadableLoaderOptions& options, const ResourceLoaderOptions& resourceLoaderOptions)
{
return adoptRef(new WorkerThreadableLoader(workerGlobalScope, clientWrapper, clientBridge, request, options, resourceLoaderOptions));
}
~WorkerThreadableLoader() override;
void overrideTimeout(unsigned long timeout) override;
void cancel() override;
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 -- WorkerGlobalScopeProxy 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 createCrossThreadTask), so the ThreadableLoaderClientWrapper instance is there until all
// tasks are executed.
class MainThreadBridge final : public ThreadableLoaderClient {
public:
// All executed on the worker context's thread.
MainThreadBridge(PassRefPtr<ThreadableLoaderClientWrapper>, PassOwnPtr<ThreadableLoaderClient>, PassRefPtr<WorkerLoaderProxy>, const ResourceRequest&, const ThreadableLoaderOptions&, const ResourceLoaderOptions&, const ReferrerPolicy, const String& outgoingReferrer);
void overrideTimeout(unsigned long timeoutMilliseconds);
void cancel();
void destroy();
private:
// Executed on the worker context's thread.
void clearClientWrapper();
// All executed on the main thread.
void mainThreadDestroy(ExecutionContext*);
~MainThreadBridge() override;
void mainThreadCreateLoader(PassOwnPtr<CrossThreadResourceRequestData>, ThreadableLoaderOptions, ResourceLoaderOptions, const ReferrerPolicy, const String& outgoingReferrer, ExecutionContext*);
void mainThreadOverrideTimeout(unsigned long timeoutMilliseconds, ExecutionContext*);
void mainThreadCancel(ExecutionContext*);
void didSendData(unsigned long long bytesSent, unsigned long long totalBytesToBeSent) override;
void didReceiveResponse(unsigned long identifier, const ResourceResponse&, PassOwnPtr<WebDataConsumerHandle>) override;
void didReceiveData(const char*, unsigned dataLength) override;
void didDownloadData(int dataLength) override;
void didReceiveCachedMetadata(const char*, int dataLength) override;
void didFinishLoading(unsigned long identifier, double finishTime) override;
void didFail(const ResourceError&) override;
void didFailAccessControlCheck(const ResourceError&) override;
void didFailRedirectCheck() override;
void didReceiveResourceTiming(const ResourceTimingInfo&) override;
// Only to be used on the main thread.
RefPtr<ThreadableLoader> m_mainThreadLoader;
OwnPtr<ThreadableLoaderClient> m_clientBridge;
// ThreadableLoaderClientWrapper is to be used on the worker context thread.
// The ref counting is done on either thread.
RefPtr<ThreadableLoaderClientWrapper> m_workerClientWrapper;
// Used on the worker context thread.
RefPtr<WorkerLoaderProxy> m_loaderProxy;
};
WorkerThreadableLoader(WorkerGlobalScope&, PassRefPtr<ThreadableLoaderClientWrapper>, PassOwnPtr<ThreadableLoaderClient>, const ResourceRequest&, const ThreadableLoaderOptions&, const ResourceLoaderOptions&);
void didReceiveResourceTiming(const ResourceTimingInfo&) override;
RefPtrWillBePersistent<WorkerGlobalScope> m_workerGlobalScope;
RefPtr<ThreadableLoaderClientWrapper> m_workerClientWrapper;
MainThreadBridge& m_bridge;
};
} // namespace blink
#endif // WorkerThreadableLoader_h