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      1 /*
      2  * Copyright (C) 2008, 2010 Apple Inc. All Rights Reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  *
     25  */
     26 
     27 #ifndef Worker_h
     28 #define Worker_h
     29 
     30 #include "core/dom/ActiveDOMObject.h"
     31 #include "core/dom/EventListener.h"
     32 #include "core/dom/EventNames.h"
     33 #include "core/dom/EventTarget.h"
     34 #include "core/dom/MessagePort.h"
     35 #include "core/workers/AbstractWorker.h"
     36 #include "core/workers/WorkerScriptLoaderClient.h"
     37 #include <wtf/Forward.h>
     38 #include <wtf/PassRefPtr.h>
     39 #include <wtf/RefPtr.h>
     40 #include <wtf/text/AtomicStringHash.h>
     41 
     42 namespace WebCore {
     43 
     44 class ExceptionState;
     45 class ScriptExecutionContext;
     46 class WorkerGlobalScopeProxy;
     47 class WorkerScriptLoader;
     48 
     49 class Worker : public AbstractWorker, public ScriptWrappable, private WorkerScriptLoaderClient {
     50 public:
     51     static PassRefPtr<Worker> create(ScriptExecutionContext*, const String& url, ExceptionState&);
     52     virtual ~Worker();
     53 
     54     virtual const AtomicString& interfaceName() const OVERRIDE;
     55 
     56     void postMessage(PassRefPtr<SerializedScriptValue> message, const MessagePortArray*, ExceptionState&);
     57 
     58     void terminate();
     59 
     60     virtual bool canSuspend() const OVERRIDE;
     61     virtual void stop() OVERRIDE;
     62     virtual bool hasPendingActivity() const OVERRIDE;
     63 
     64     DEFINE_ATTRIBUTE_EVENT_LISTENER(message);
     65 
     66 private:
     67     explicit Worker(ScriptExecutionContext*);
     68 
     69     // WorkerScriptLoaderClient callbacks
     70     virtual void didReceiveResponse(unsigned long identifier, const ResourceResponse&) OVERRIDE;
     71     virtual void notifyFinished() OVERRIDE;
     72 
     73     virtual void refEventTarget() OVERRIDE { ref(); }
     74     virtual void derefEventTarget() OVERRIDE { deref(); }
     75 
     76     RefPtr<WorkerScriptLoader> m_scriptLoader;
     77     WorkerGlobalScopeProxy* m_contextProxy; // The proxy outlives the worker to perform thread shutdown.
     78 };
     79 
     80 } // namespace WebCore
     81 
     82 #endif // Worker_h
     83