/*
 * 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

#include "core/dom/ExecutionContext.h"
#include "core/workers/WorkerGlobalScopeProxy.h"
#include "core/workers/WorkerLoaderProxy.h"
#include "wtf/Forward.h"
#include "wtf/Noncopyable.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefPtr.h"
#include "wtf/Vector.h"

namespace blink {

class WorkerObjectProxy;
class DedicatedWorkerThread;
class ExecutionContext;
class Worker;
class WorkerClients;

class WorkerMessagingProxy FINAL : public WorkerGlobalScopeProxy, public WorkerLoaderProxy {
    WTF_MAKE_NONCOPYABLE(WorkerMessagingProxy); WTF_MAKE_FAST_ALLOCATED;
public:
    WorkerMessagingProxy(Worker*, PassOwnPtrWillBeRawPtr<WorkerClients>);

    // Implementations of WorkerGlobalScopeProxy.
    // (Only use these methods in the worker object thread.)
    virtual void startWorkerGlobalScope(const KURL& scriptURL, const String& userAgent, const String& sourceCode, WorkerThreadStartMode) OVERRIDE;
    virtual void terminateWorkerGlobalScope() OVERRIDE;
    virtual void postMessageToWorkerGlobalScope(PassRefPtr<SerializedScriptValue>, PassOwnPtr<MessagePortChannelArray>) OVERRIDE;
    virtual bool hasPendingActivity() const OVERRIDE;
    virtual void workerObjectDestroyed() OVERRIDE;
    virtual void connectToInspector(WorkerGlobalScopeProxy::PageInspector*) OVERRIDE;
    virtual void disconnectFromInspector() OVERRIDE;
    virtual void sendMessageToInspector(const String&) OVERRIDE;
    virtual void writeTimelineStartedEvent(const String& sessionId) OVERRIDE;

    // These methods come from worker context thread via WorkerObjectProxy
    // and are called on the worker object thread (e.g. main thread).
    void postMessageToWorkerObject(PassRefPtr<SerializedScriptValue>, PassOwnPtr<MessagePortChannelArray>);
    void reportException(const String& errorMessage, int lineNumber, int columnNumber, const String& sourceURL);
    void reportConsoleMessage(MessageSource, MessageLevel, const String& message, int lineNumber, const String& sourceURL);
    void postMessageToPageInspector(const String&);
    void confirmMessageFromWorkerObject(bool hasPendingActivity);
    void reportPendingActivity(bool hasPendingActivity);
    void workerGlobalScopeClosed();
    void workerThreadTerminated();

    // Implementation of WorkerLoaderProxy.
    // These methods are called on different threads to schedule loading
    // requests and to send callbacks back to WorkerGlobalScope.
    virtual void postTaskToLoader(PassOwnPtr<ExecutionContextTask>) OVERRIDE;
    virtual bool postTaskToWorkerGlobalScope(PassOwnPtr<ExecutionContextTask>) OVERRIDE;

    void workerThreadCreated(PassRefPtr<DedicatedWorkerThread>);

protected:
    virtual ~WorkerMessagingProxy();

private:
    static void workerObjectDestroyedInternal(ExecutionContext*, WorkerMessagingProxy*);
    void terminateInternally();

    RefPtrWillBePersistent<ExecutionContext> m_executionContext;
    OwnPtr<WorkerObjectProxy> m_workerObjectProxy;
    Worker* m_workerObject;
    bool m_mayBeDestroyed;
    RefPtr<DedicatedWorkerThread> 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<OwnPtr<ExecutionContextTask> > m_queuedEarlyTasks; // Tasks are queued here until there's a thread object created.
    WorkerGlobalScopeProxy::PageInspector* m_pageInspector;

    OwnPtrWillBePersistent<WorkerClients> m_workerClients;
};

} // namespace blink

#endif // WorkerMessagingProxy_h
