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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/MessagePort.h"
     32 #include "core/events/EventListener.h"
     33 #include "core/events/EventTarget.h"
     34 #include "core/workers/AbstractWorker.h"
     35 #include "core/workers/WorkerScriptLoaderClient.h"
     36 #include "platform/heap/Handle.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 blink {
     43 
     44 class ExceptionState;
     45 class ExecutionContext;
     46 class WorkerGlobalScopeProxy;
     47 class WorkerScriptLoader;
     48 
     49 class Worker FINAL : public AbstractWorker, private WorkerScriptLoaderClient {
     50     DEFINE_WRAPPERTYPEINFO();
     51 public:
     52     static PassRefPtrWillBeRawPtr<Worker> create(ExecutionContext*, const String& url, ExceptionState&);
     53     virtual ~Worker();
     54 
     55     virtual const AtomicString& interfaceName() const OVERRIDE;
     56 
     57     void postMessage(ExecutionContext*, PassRefPtr<SerializedScriptValue> message, const MessagePortArray*, ExceptionState&);
     58 
     59     void terminate();
     60 
     61     virtual void stop() OVERRIDE;
     62     virtual bool hasPendingActivity() const OVERRIDE;
     63 
     64     DEFINE_ATTRIBUTE_EVENT_LISTENER(message);
     65 
     66     virtual void trace(Visitor*) OVERRIDE;
     67 
     68 private:
     69     explicit Worker(ExecutionContext*);
     70 
     71     // WorkerScriptLoaderClient callbacks
     72     virtual void didReceiveResponse(unsigned long identifier, const ResourceResponse&) OVERRIDE;
     73     virtual void notifyFinished() OVERRIDE;
     74 
     75     RefPtr<WorkerScriptLoader> m_scriptLoader;
     76     WorkerGlobalScopeProxy* m_contextProxy; // The proxy outlives the worker to perform thread shutdown.
     77 };
     78 
     79 } // namespace blink
     80 
     81 #endif // Worker_h
     82