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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 #if ENABLE(WORKERS)
     31 
     32 #include "AbstractWorker.h"
     33 #include "ActiveDOMObject.h"
     34 #include "EventListener.h"
     35 #include "EventNames.h"
     36 #include "EventTarget.h"
     37 #include "MessagePort.h"
     38 #include "WorkerScriptLoaderClient.h"
     39 #include <wtf/Forward.h>
     40 #include <wtf/OwnPtr.h>
     41 #include <wtf/PassRefPtr.h>
     42 #include <wtf/RefCounted.h>
     43 #include <wtf/RefPtr.h>
     44 #include <wtf/text/AtomicStringHash.h>
     45 
     46 namespace WebCore {
     47 
     48     class ScriptExecutionContext;
     49     class WorkerContextProxy;
     50     class WorkerScriptLoader;
     51 
     52     typedef int ExceptionCode;
     53 
     54     class Worker : public AbstractWorker, private WorkerScriptLoaderClient {
     55     public:
     56         static PassRefPtr<Worker> create(const String& url, ScriptExecutionContext*, ExceptionCode&);
     57         virtual ~Worker();
     58 
     59         virtual Worker* toWorker() { return this; }
     60 
     61         void postMessage(PassRefPtr<SerializedScriptValue> message, ExceptionCode&);
     62         void postMessage(PassRefPtr<SerializedScriptValue> message, const MessagePortArray*, ExceptionCode&);
     63         // FIXME: remove this when we update the ObjC bindings (bug #28774).
     64         void postMessage(PassRefPtr<SerializedScriptValue> message, MessagePort*, ExceptionCode&);
     65 
     66         void terminate();
     67 
     68         virtual bool canSuspend() const;
     69         virtual void stop();
     70         virtual bool hasPendingActivity() const;
     71 
     72         DEFINE_ATTRIBUTE_EVENT_LISTENER(message);
     73 
     74     private:
     75         Worker(ScriptExecutionContext*);
     76 
     77         virtual void notifyFinished();
     78 
     79         virtual void refEventTarget() { ref(); }
     80         virtual void derefEventTarget() { deref(); }
     81 
     82         OwnPtr<WorkerScriptLoader> m_scriptLoader;
     83         WorkerContextProxy* m_contextProxy; // The proxy outlives the worker to perform thread shutdown.
     84     };
     85 
     86 } // namespace WebCore
     87 
     88 #endif // ENABLE(WORKERS)
     89 
     90 #endif // Worker_h
     91