1 /*
2 * Copyright (C) 2008 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,
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.
25 *
26 */
27
28 #include "config.h"
29
30 #if ENABLE(WORKERS)
31
32 #include "Worker.h"
33
34 #include "DOMWindow.h"
35 #include "DocLoader.h"
36 #include "Document.h"
37 #include "EventException.h"
38 #include "EventListener.h"
39 #include "EventNames.h"
40 #include "ExceptionCode.h"
41 #include "Frame.h"
42 #include "FrameLoader.h"
43 #include "MessageEvent.h"
44 #include "TextEncoding.h"
45 #include "WorkerContextProxy.h"
46 #include "WorkerScriptLoader.h"
47 #include "WorkerThread.h"
48 #include <wtf/MainThread.h>
49
50 namespace WebCore {
51
Worker(const String & url,ScriptExecutionContext * context,ExceptionCode & ec)52 Worker::Worker(const String& url, ScriptExecutionContext* context, ExceptionCode& ec)
53 : AbstractWorker(context)
54 , m_contextProxy(WorkerContextProxy::create(this))
55 {
56 KURL scriptURL = resolveURL(url, ec);
57 if (ec)
58 return;
59
60 m_scriptLoader = new WorkerScriptLoader();
61 m_scriptLoader->loadAsynchronously(scriptExecutionContext(), scriptURL, DenyCrossOriginRedirect, this);
62 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.
63 }
64
~Worker()65 Worker::~Worker()
66 {
67 ASSERT(isMainThread());
68 ASSERT(scriptExecutionContext()); // The context is protected by worker context proxy, so it cannot be destroyed while a Worker exists.
69 m_contextProxy->workerObjectDestroyed();
70 }
71
postMessage(const String & message,ExceptionCode & ec)72 void Worker::postMessage(const String& message, ExceptionCode& ec)
73 {
74 postMessage(message, 0, ec);
75 }
76
postMessage(const String & message,MessagePort * messagePort,ExceptionCode & ec)77 void Worker::postMessage(const String& message, MessagePort* messagePort, ExceptionCode& ec)
78 {
79 // Disentangle the port in preparation for sending it to the remote context.
80 OwnPtr<MessagePortChannel> channel = messagePort ? messagePort->disentangle(ec) : 0;
81 if (ec)
82 return;
83 m_contextProxy->postMessageToWorkerContext(message, channel.release());
84 }
85
terminate()86 void Worker::terminate()
87 {
88 m_contextProxy->terminateWorkerContext();
89 }
90
canSuspend() const91 bool Worker::canSuspend() const
92 {
93 // FIXME: It is not currently possible to suspend a worker, so pages with workers can not go into page cache.
94 return false;
95 }
96
stop()97 void Worker::stop()
98 {
99 terminate();
100 }
101
hasPendingActivity() const102 bool Worker::hasPendingActivity() const
103 {
104 return m_contextProxy->hasPendingActivity() || ActiveDOMObject::hasPendingActivity();
105 }
106
notifyFinished()107 void Worker::notifyFinished()
108 {
109 if (m_scriptLoader->failed())
110 dispatchLoadErrorEvent();
111 else
112 m_contextProxy->startWorkerContext(m_scriptLoader->url(), scriptExecutionContext()->userAgent(m_scriptLoader->url()), m_scriptLoader->script());
113
114 m_scriptLoader = 0;
115
116 unsetPendingActivity(this);
117 }
118
dispatchMessage(const String & message,PassRefPtr<MessagePort> port)119 void Worker::dispatchMessage(const String& message, PassRefPtr<MessagePort> port)
120 {
121 RefPtr<Event> evt = MessageEvent::create(message, "", "", 0, port);
122
123 if (m_onMessageListener.get()) {
124 evt->setTarget(this);
125 evt->setCurrentTarget(this);
126 m_onMessageListener->handleEvent(evt.get(), false);
127 }
128
129 ExceptionCode ec = 0;
130 dispatchEvent(evt.release(), ec);
131 ASSERT(!ec);
132 }
133
134 } // namespace WebCore
135
136 #endif // ENABLE(WORKERS)
137