src/third_party/WebKit/Source/core/workers/Worker.cpp

   1 /*
   2  * Copyright (C) 2008, 2010 Apple Inc. All Rights Reserved.
   3  * Copyright (C) 2009 Google Inc. All Rights Reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  */
  27
  28 #include "config.h"
  29 #include "core/workers/Worker.h"
  30
  31 #include "bindings/v8/ExceptionState.h"
  32 #include "core/dom/Document.h"
  33 #include "core/events/MessageEvent.h"
  34 #include "core/fetch/ResourceFetcher.h"
  35 #include "core/inspector/InspectorInstrumentation.h"
  36 #include "core/frame/DOMWindow.h"
  37 #include "core/frame/UseCounter.h"
  38 #include "core/workers/WorkerGlobalScopeProxy.h"
  39 #include "core/workers/WorkerGlobalScopeProxyProvider.h"
  40 #include "core/workers/WorkerScriptLoader.h"
  41 #include "core/workers/WorkerThread.h"
  42 #include "wtf/MainThread.h"
  43
  44 namespace WebCore {
  45
  46 inline Worker::Worker(ExecutionContext* context)
  47     : AbstractWorker(context)
  48     , m_contextProxy(0)
  49 {
  50     ScriptWrappable::init(this);
  51 }
  52
  53 PassRefPtr<Worker> Worker::create(ExecutionContext* context, const String& url, ExceptionState& exceptionState)
  54 {
  55     ASSERT(isMainThread());
  56     Document* document = toDocument(context);
  57     UseCounter::count(context, UseCounter::WorkerStart);
  58     if (!document->page()) {
  59         exceptionState.throwDOMException(InvalidAccessError, "The context provided is invalid.");
  60         return 0;
  61     }
  62     WorkerGlobalScopeProxyProvider* proxyProvider = WorkerGlobalScopeProxyProvider::from(document->page());
  63     ASSERT(proxyProvider);
  64
  65     RefPtr<Worker> worker = adoptRef(new Worker(context));
  66
  67     worker->suspendIfNeeded();
  68
  69     KURL scriptURL = worker->resolveURL(url, exceptionState);
  70     if (scriptURL.isEmpty())
  71         return 0;
  72
  73     // The worker context does not exist while loading, so we must ensure that the worker object is not collected, nor are its event listeners.
  74     worker->setPendingActivity(worker.get());
  75
  76     worker->m_scriptLoader = WorkerScriptLoader::create();
  77     worker->m_scriptLoader->loadAsynchronously(context, scriptURL, DenyCrossOriginRequests, worker.get());
  78     worker->m_contextProxy = proxyProvider->createWorkerGlobalScopeProxy(worker.get());
  79     return worker.release();
  80 }
  81
  82 Worker::~Worker()
  83 {
  84     ASSERT(isMainThread());
  85     ASSERT(executionContext()); // The context is protected by worker context proxy, so it cannot be destroyed while a Worker exists.
  86     if (m_contextProxy)
  87         m_contextProxy->workerObjectDestroyed();
  88 }
  89
  90 const AtomicString& Worker::interfaceName() const
  91 {
  92     return EventTargetNames::Worker;
  93 }
  94
  95 void Worker::postMessage(PassRefPtr<SerializedScriptValue> message, const MessagePortArray* ports, ExceptionState& exceptionState)
  96 {
  97     // Disentangle the port in preparation for sending it to the remote context.
  98     OwnPtr<MessagePortChannelArray> channels = MessagePort::disentanglePorts(ports, exceptionState);
  99     if (exceptionState.hadException())
 100         return;
 101     m_contextProxy->postMessageToWorkerGlobalScope(message, channels.release());
 102 }
 103
 104 void Worker::terminate()
 105 {
 106     m_contextProxy->terminateWorkerGlobalScope();
 107 }
 108
 109 void Worker::stop()
 110 {
 111     terminate();
 112 }
 113
 114 bool Worker::hasPendingActivity() const
 115 {
 116     return m_contextProxy->hasPendingActivity() || ActiveDOMObject::hasPendingActivity();
 117 }
 118
 119 void Worker::didReceiveResponse(unsigned long identifier, const ResourceResponse&)
 120 {
 121     InspectorInstrumentation::didReceiveScriptResponse(executionContext(), identifier);
 122 }
 123
 124 void Worker::notifyFinished()
 125 {
 126     if (m_scriptLoader->failed()) {
 127         dispatchEvent(Event::createCancelable(EventTypeNames::error));
 128     } else {
 129         WorkerThreadStartMode startMode = DontPauseWorkerGlobalScopeOnStart;
 130         if (InspectorInstrumentation::shouldPauseDedicatedWorkerOnStart(executionContext()))
 131             startMode = PauseWorkerGlobalScopeOnStart;
 132         m_contextProxy->startWorkerGlobalScope(m_scriptLoader->url(), executionContext()->userAgent(m_scriptLoader->url()), m_scriptLoader->script(), startMode);
 133         InspectorInstrumentation::scriptImported(executionContext(), m_scriptLoader->identifier(), m_scriptLoader->script());
 134     }
 135     m_scriptLoader = nullptr;
 136
 137     unsetPendingActivity(this);
 138 }
 139
 140 } // namespace WebCore