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, DenyCrossOriginRequests, 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
72 // FIXME: remove this when we update the ObjC bindings (bug #28774).
postMessage(PassRefPtr<SerializedScriptValue> message,MessagePort * port,ExceptionCode & ec)73 void Worker::postMessage(PassRefPtr<SerializedScriptValue> message, MessagePort* port, ExceptionCode& ec)
74 {
75 MessagePortArray ports;
76 if (port)
77 ports.append(port);
78 postMessage(message, &ports, ec);
79 }
80
postMessage(PassRefPtr<SerializedScriptValue> message,ExceptionCode & ec)81 void Worker::postMessage(PassRefPtr<SerializedScriptValue> message, ExceptionCode& ec)
82 {
83 postMessage(message, static_cast<MessagePortArray*>(0), ec);
84 }
85
postMessage(PassRefPtr<SerializedScriptValue> message,const MessagePortArray * ports,ExceptionCode & ec)86 void Worker::postMessage(PassRefPtr<SerializedScriptValue> message, const MessagePortArray* ports, ExceptionCode& ec)
87 {
88 // Disentangle the port in preparation for sending it to the remote context.
89 OwnPtr<MessagePortChannelArray> channels = MessagePort::disentanglePorts(ports, ec);
90 if (ec)
91 return;
92 m_contextProxy->postMessageToWorkerContext(message, channels.release());
93 }
94
terminate()95 void Worker::terminate()
96 {
97 m_contextProxy->terminateWorkerContext();
98 }
99
canSuspend() const100 bool Worker::canSuspend() const
101 {
102 // FIXME: It is not currently possible to suspend a worker, so pages with workers can not go into page cache.
103 return false;
104 }
105
stop()106 void Worker::stop()
107 {
108 terminate();
109 }
110
hasPendingActivity() const111 bool Worker::hasPendingActivity() const
112 {
113 return m_contextProxy->hasPendingActivity() || ActiveDOMObject::hasPendingActivity();
114 }
115
notifyFinished()116 void Worker::notifyFinished()
117 {
118 if (m_scriptLoader->failed())
119 dispatchEvent(Event::create(eventNames().errorEvent, false, true));
120 else
121 m_contextProxy->startWorkerContext(m_scriptLoader->url(), scriptExecutionContext()->userAgent(m_scriptLoader->url()), m_scriptLoader->script());
122
123 m_scriptLoader = 0;
124
125 unsetPendingActivity(this);
126 }
127
128 } // namespace WebCore
129
130 #endif // ENABLE(WORKERS)
131