2 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
3 * Copyright (C) 2009 Google Inc. All Rights Reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.
34 #include "DOMWindow.h"
35 #include "DocLoader.h"
37 #include "EventException.h"
38 #include "EventListener.h"
39 #include "EventNames.h"
40 #include "ExceptionCode.h"
42 #include "FrameLoader.h"
43 #include "MessageEvent.h"
44 #include "SecurityOrigin.h"
45 #include "TextEncoding.h"
46 #include "WorkerContextProxy.h"
47 #include "WorkerScriptLoader.h"
48 #include "WorkerThread.h"
49 #include <wtf/MainThread.h>
53 Worker::Worker(const String& url, ScriptExecutionContext* context, ExceptionCode& ec)
54 : AbstractWorker(context)
55 , m_contextProxy(WorkerContextProxy::create(this))
62 KURL scriptURL = context->completeURL(url);
63 if (!scriptURL.isValid()) {
68 if (!context->securityOrigin()->canAccess(SecurityOrigin::create(scriptURL).get())) {
73 m_scriptLoader = new WorkerScriptLoader();
74 m_scriptLoader->loadAsynchronously(scriptExecutionContext(), scriptURL, DenyCrossOriginRedirect, this);
75 setPendingActivity(this); // The worker context does not exist while loading, so we must ensure that the worker object is not collected, as well as its event listeners.
80 ASSERT(isMainThread());
81 ASSERT(scriptExecutionContext()); // The context is protected by worker context proxy, so it cannot be destroyed while a Worker exists.
82 m_contextProxy->workerObjectDestroyed();
85 void Worker::postMessage(const String& message, ExceptionCode& ec)
87 postMessage(message, 0, ec);
90 void Worker::postMessage(const String& message, MessagePort* messagePort, ExceptionCode& ec)
92 // Disentangle the port in preparation for sending it to the remote context.
93 OwnPtr<MessagePortChannel> channel = messagePort ? messagePort->disentangle(ec) : 0;
96 m_contextProxy->postMessageToWorkerContext(message, channel.release());
99 void Worker::terminate()
101 m_contextProxy->terminateWorkerContext();
104 bool Worker::canSuspend() const
106 // FIXME: It is not currently possible to suspend a worker, so pages with workers can not go into page cache.
115 bool Worker::hasPendingActivity() const
117 return m_contextProxy->hasPendingActivity() || ActiveDOMObject::hasPendingActivity();
120 void Worker::notifyFinished()
122 if (m_scriptLoader->failed())
123 dispatchLoadErrorEvent();
125 m_contextProxy->startWorkerContext(m_scriptLoader->url(), scriptExecutionContext()->userAgent(m_scriptLoader->url()), m_scriptLoader->script());
129 unsetPendingActivity(this);
132 void Worker::dispatchMessage(const String& message, PassRefPtr<MessagePort> port)
134 RefPtr<Event> evt = MessageEvent::create(message, "", "", 0, port);
136 if (m_onMessageListener.get()) {
137 evt->setTarget(this);
138 evt->setCurrentTarget(this);
139 m_onMessageListener->handleEvent(evt.get(), false);
142 ExceptionCode ec = 0;
143 dispatchEvent(evt.release(), ec);
147 } // namespace WebCore
149 #endif // ENABLE(WORKERS)