AI 145796: Land the WebKit merge @r42026.

Automated import of CL 145796

1 files changed, 104 insertions, 0 deletions

diff --git a/WebCore/workers/WorkerMessagingProxy.h b/WebCore/workers/WorkerMessagingProxy.h
new file mode 100644
index 0000000..8d81deb
--- /dev/null
+++ b/WebCore/workers/WorkerMessagingProxy.h
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+/*
+ * Copyright (C) 2008 Apple Inc. All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ *
+ */
+
+#ifndef WorkerMessagingProxy_h
+#define WorkerMessagingProxy_h
+
+#if ENABLE(WORKERS)
+
+#include "ScriptExecutionContext.h"
+#include "WorkerContextProxy.h"
+#include "WorkerObjectProxy.h"
+#include <wtf/Noncopyable.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefPtr.h>
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+    class ScriptExecutionContext;
+    class String;
+    class Worker;
+    class WorkerThread;
+
+    class WorkerMessagingProxy : public WorkerContextProxy, public WorkerObjectProxy, Noncopyable {
+    public:
+        WorkerMessagingProxy(Worker*);
+
+        // Implementations of WorkerContextProxy.
+        // (Only use these methods in the worker object thread.)
+        virtual void startWorkerContext(const KURL& scriptURL, const String& userAgent, const String& sourceCode);
+        virtual void terminateWorkerContext();
+        virtual void postMessageToWorkerContext(const String& message);
+        virtual bool hasPendingActivity() const;
+        virtual void workerObjectDestroyed();
+
+        // Implementations of WorkerObjectProxy.
+        // (Only use these methods in the worker context thread.)
+        virtual void postMessageToWorkerObject(const String& message);
+        virtual void postExceptionToWorkerObject(const String& errorMessage, int lineNumber, const String& sourceURL);
+        virtual void postConsoleMessageToWorkerObject(MessageDestination, MessageSource, MessageLevel, const String& message, int lineNumber, const String& sourceURL);
+        virtual void confirmMessageFromWorkerObject(bool hasPendingActivity);
+        virtual void reportPendingActivity(bool hasPendingActivity);
+        virtual void workerContextDestroyed();
+
+        void postTaskToWorkerObject(PassRefPtr<ScriptExecutionContext::Task>);
+        void postTaskToWorkerContext(PassRefPtr<ScriptExecutionContext::Task>);
+        void postTaskForModeToWorkerContext(PassRefPtr<ScriptExecutionContext::Task>, const String& mode);
+
+        void workerThreadCreated(PassRefPtr<WorkerThread>);
+
+        // Only use this method on the worker object thread.
+        bool askedToTerminate() const { return m_askedToTerminate; }
+
+    private:
+        friend class MessageWorkerTask;
+        friend class WorkerContextDestroyedTask;
+        friend class WorkerThreadActivityReportTask;
+
+        virtual ~WorkerMessagingProxy();
+
+        void workerContextDestroyedInternal();
+        void reportPendingActivityInternal(bool confirmingMessage, bool hasPendingActivity);
+        Worker* workerObject() const { return m_workerObject; }
+
+        RefPtr<ScriptExecutionContext> m_scriptExecutionContext;
+        Worker* m_workerObject;
+        RefPtr<WorkerThread> m_workerThread;
+
+        unsigned m_unconfirmedMessageCount; // Unconfirmed messages from worker object to worker thread.
+        bool m_workerThreadHadPendingActivity; // The latest confirmation from worker thread reported that it was still active.
+
+        bool m_askedToTerminate;
+
+        Vector<RefPtr<ScriptExecutionContext::Task> > m_queuedEarlyTasks; // Tasks are queued here until there's a thread object created.
+    };
+
+} // namespace WebCore
+
+#endif // ENABLE(WORKERS)
+
+#endif // WorkerMessagingProxy_h