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      1 /*
      2  * Copyright (C) 2008 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 WorkerMessagingProxy_h
     28 #define WorkerMessagingProxy_h
     29 
     30 #include "core/dom/ExecutionContext.h"
     31 #include "core/workers/WorkerGlobalScopeProxy.h"
     32 #include "core/workers/WorkerLoaderProxy.h"
     33 #include "wtf/Forward.h"
     34 #include "wtf/Noncopyable.h"
     35 #include "wtf/PassOwnPtr.h"
     36 #include "wtf/PassRefPtr.h"
     37 #include "wtf/RefPtr.h"
     38 #include "wtf/Vector.h"
     39 
     40 namespace WebCore {
     41 
     42     class WorkerObjectProxy;
     43     class DedicatedWorkerThread;
     44     class ExecutionContext;
     45     class Worker;
     46     class WorkerClients;
     47 
     48     class WorkerMessagingProxy : public WorkerGlobalScopeProxy, public WorkerLoaderProxy {
     49         WTF_MAKE_NONCOPYABLE(WorkerMessagingProxy); WTF_MAKE_FAST_ALLOCATED;
     50     public:
     51         WorkerMessagingProxy(Worker*, PassOwnPtr<WorkerClients>);
     52 
     53         // Implementations of WorkerGlobalScopeProxy.
     54         // (Only use these methods in the worker object thread.)
     55         virtual void startWorkerGlobalScope(const KURL& scriptURL, const String& userAgent, const String& sourceCode, WorkerThreadStartMode) OVERRIDE;
     56         virtual void terminateWorkerGlobalScope() OVERRIDE;
     57         virtual void postMessageToWorkerGlobalScope(PassRefPtr<SerializedScriptValue>, PassOwnPtr<MessagePortChannelArray>) OVERRIDE;
     58         virtual bool hasPendingActivity() const OVERRIDE;
     59         virtual void workerObjectDestroyed() OVERRIDE;
     60         virtual void connectToInspector(WorkerGlobalScopeProxy::PageInspector*) OVERRIDE;
     61         virtual void disconnectFromInspector() OVERRIDE;
     62         virtual void sendMessageToInspector(const String&) OVERRIDE;
     63 
     64         // These methods come from worker context thread via WorkerObjectProxy
     65         // and are called on the worker object thread (e.g. main thread).
     66         void postMessageToWorkerObject(PassRefPtr<SerializedScriptValue>, PassOwnPtr<MessagePortChannelArray>);
     67         void reportException(const String& errorMessage, int lineNumber, int columnNumber, const String& sourceURL);
     68         void reportConsoleMessage(MessageSource, MessageLevel, const String& message, int lineNumber, const String& sourceURL);
     69         void postMessageToPageInspector(const String&);
     70         void confirmMessageFromWorkerObject(bool hasPendingActivity);
     71         void reportPendingActivity(bool hasPendingActivity);
     72         void workerGlobalScopeClosed();
     73         void workerGlobalScopeDestroyed();
     74 
     75         // Implementation of WorkerLoaderProxy.
     76         // These methods are called on different threads to schedule loading
     77         // requests and to send callbacks back to WorkerGlobalScope.
     78         virtual void postTaskToLoader(PassOwnPtr<ExecutionContextTask>) OVERRIDE;
     79         virtual bool postTaskForModeToWorkerGlobalScope(PassOwnPtr<ExecutionContextTask>, const String& mode) OVERRIDE;
     80 
     81         void workerThreadCreated(PassRefPtr<DedicatedWorkerThread>);
     82 
     83     protected:
     84         virtual ~WorkerMessagingProxy();
     85 
     86     private:
     87         static void workerObjectDestroyedInternal(ExecutionContext*, WorkerMessagingProxy*);
     88 
     89         RefPtr<ExecutionContext> m_executionContext;
     90         OwnPtr<WorkerObjectProxy> m_workerObjectProxy;
     91         Worker* m_workerObject;
     92         bool m_mayBeDestroyed;
     93         RefPtr<DedicatedWorkerThread> m_workerThread;
     94 
     95         unsigned m_unconfirmedMessageCount; // Unconfirmed messages from worker object to worker thread.
     96         bool m_workerThreadHadPendingActivity; // The latest confirmation from worker thread reported that it was still active.
     97 
     98         bool m_askedToTerminate;
     99 
    100         Vector<OwnPtr<ExecutionContextTask> > m_queuedEarlyTasks; // Tasks are queued here until there's a thread object created.
    101         WorkerGlobalScopeProxy::PageInspector* m_pageInspector;
    102 
    103         OwnPtr<WorkerClients> m_workerClients;
    104     };
    105 
    106 } // namespace WebCore
    107 
    108 #endif // WorkerMessagingProxy_h
    109