Home | History | Annotate | Download | only in workers 
      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,
     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 "CachedResourceLoader.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 "InspectorInstrumentation.h"
     44 #include "MessageEvent.h"
     45 #include "TextEncoding.h"
     46 #include "WorkerContextProxy.h"
     47 #include "WorkerScriptLoader.h"
     48 #include "WorkerThread.h"
     49 #include <wtf/MainThread.h>
     50 
     51 namespace WebCore {
     52 
     53 inline Worker::Worker(ScriptExecutionContext* context)
     54     : AbstractWorker(context)
     55     , m_contextProxy(WorkerContextProxy::create(this))
     56 {
     57 }
     58 
     59 PassRefPtr<Worker> Worker::create(const String& url, ScriptExecutionContext* context, ExceptionCode& ec)
     60 {
     61     RefPtr<Worker> worker = adoptRef(new Worker(context));
     62 
     63     KURL scriptURL = worker->resolveURL(url, ec);
     64     if (scriptURL.isEmpty())
     65         return 0;
     66 
     67     worker->m_scriptLoader = adoptPtr(new WorkerScriptLoader(ResourceRequestBase::TargetIsWorker));
     68     worker->m_scriptLoader->loadAsynchronously(context, scriptURL, DenyCrossOriginRequests, worker.get());
     69 
     70     // The worker context does not exist while loading, so we must ensure that the worker object is not collected, nor are its event listeners.
     71     worker->setPendingActivity(worker.get());
     72 
     73     InspectorInstrumentation::didCreateWorker(context, worker->asID(), scriptURL.string(), false);
     74 
     75     return worker.release();
     76 }
     77 
     78 Worker::~Worker()
     79 {
     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();
     83 }
     84 
     85 // FIXME: remove this when we update the ObjC bindings (bug #28774).
     86 void Worker::postMessage(PassRefPtr<SerializedScriptValue> message, MessagePort* port, ExceptionCode& ec)
     87 {
     88     MessagePortArray ports;
     89     if (port)
     90         ports.append(port);
     91     postMessage(message, &ports, ec);
     92 }
     93 
     94 void Worker::postMessage(PassRefPtr<SerializedScriptValue> message, ExceptionCode& ec)
     95 {
     96     postMessage(message, static_cast<MessagePortArray*>(0), ec);
     97 }
     98 
     99 void Worker::postMessage(PassRefPtr<SerializedScriptValue> message, const MessagePortArray* ports, ExceptionCode& ec)
    100 {
    101     // Disentangle the port in preparation for sending it to the remote context.
    102     OwnPtr<MessagePortChannelArray> channels = MessagePort::disentanglePorts(ports, ec);
    103     if (ec)
    104         return;
    105     m_contextProxy->postMessageToWorkerContext(message, channels.release());
    106 }
    107 
    108 void Worker::terminate()
    109 {
    110     m_contextProxy->terminateWorkerContext();
    111 }
    112 
    113 bool Worker::canSuspend() const
    114 {
    115     // FIXME: It is not currently possible to suspend a worker, so pages with workers can not go into page cache.
    116     return false;
    117 }
    118 
    119 void Worker::stop()
    120 {
    121     terminate();
    122 }
    123 
    124 bool Worker::hasPendingActivity() const
    125 {
    126     return m_contextProxy->hasPendingActivity() || ActiveDOMObject::hasPendingActivity();
    127 }
    128 
    129 void Worker::notifyFinished()
    130 {
    131     if (m_scriptLoader->failed())
    132         dispatchEvent(Event::create(eventNames().errorEvent, false, true));
    133     else {
    134         m_contextProxy->startWorkerContext(m_scriptLoader->url(), scriptExecutionContext()->userAgent(m_scriptLoader->url()), m_scriptLoader->script());
    135         InspectorInstrumentation::scriptImported(scriptExecutionContext(), m_scriptLoader->identifier(), m_scriptLoader->script());
    136     }
    137     m_scriptLoader = 0;
    138 
    139     unsetPendingActivity(this);
    140 }
    141 
    142 } // namespace WebCore
    143 
    144 #endif // ENABLE(WORKERS)
    145