WebCore/WorkerMessagingProxy.h

   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 #if ENABLE(WORKERS)
  31
  32 #include "ScriptExecutionContext.h"
  33 #include <wtf/Noncopyable.h>
  34 #include <wtf/PassRefPtr.h>
  35 #include <wtf/RefPtr.h>
  36 #include <wtf/Vector.h>
  37
  38 namespace WebCore {
  39
  40     class ScriptExecutionContext;
  41     class String;
  42     class Worker;
  43     class WorkerTask;
  44     class WorkerThread;
  45
  46     class WorkerMessagingProxy : Noncopyable {
  47     public:
  48         WorkerMessagingProxy(PassRefPtr<ScriptExecutionContext>, Worker*);
  49
  50         void postMessageToWorkerObject(const String& message);
  51         void postMessageToWorkerContext(const String& message);
  52         void postTaskToParentContext(PassRefPtr<ScriptExecutionContext::Task>);
  53
  54         void postWorkerException(const String& errorMessage, int lineNumber, const String& sourceURL);
  55
  56         void workerThreadCreated(PassRefPtr<WorkerThread>);
  57         void workerObjectDestroyed();
  58         void workerContextDestroyed();
  59
  60         void terminate();
  61
  62         void confirmWorkerThreadMessage(bool hasPendingActivity);
  63         void reportWorkerThreadActivity(bool hasPendingActivity);
  64         bool workerThreadHasPendingActivity() const;
  65
  66     private:
  67         friend class GenericWorkerTaskBase;
  68         friend class MessageWorkerTask;
  69         friend class WorkerContextDestroyedTask;
  70         friend class WorkerExceptionTask;
  71         friend class WorkerThreadActivityReportTask;
  72
  73         ~WorkerMessagingProxy();
  74
  75         void workerContextDestroyedInternal();
  76         void reportWorkerThreadActivityInternal(bool confirmingMessage, bool hasPendingActivity);
  77         Worker* workerObject() const { return m_workerObject; }
  78         bool askedToTerminate() { return m_askedToTerminate; }
  79
  80         RefPtr<ScriptExecutionContext> m_scriptExecutionContext;
  81         Worker* m_workerObject;
  82         RefPtr<WorkerThread> m_workerThread;
  83
  84         unsigned m_unconfirmedMessageCount; // Unconfirmed messages from worker object to worker thread.
  85         bool m_workerThreadHadPendingActivity; // The latest confirmation from worker thread reported that it was still active.
  86
  87         bool m_askedToTerminate;
  88
  89         Vector<RefPtr<WorkerTask> > m_queuedEarlyTasks; // Tasks are queued here until there's a thread object created.
  90     };
  91
  92 } // namespace WebCore
  93
  94 #endif // ENABLE(WORKERS)
  95
  96 #endif // WorkerMessagingProxy_h