third_party/WebKit/Source/core/workers/WorkerMessagingProxy.h

/*
 * 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
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 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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#ifndef WorkerMessagingProxy_h
#define WorkerMessagingProxy_h

#include "core/CoreExport.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 WorkerThread;
class ExecutionContext;
class InProcessWorkerBase;
class WorkerClients;
class WorkerInspectorProxy;

class CORE_EXPORT WorkerMessagingProxy
    : public WorkerGlobalScopeProxy
    , private WorkerLoaderProxyProvider {
    WTF_MAKE_NONCOPYABLE(WorkerMessagingProxy);
public:
    // Implementations of WorkerGlobalScopeProxy.
    // (Only use these methods in the worker object thread.)
    void startWorkerGlobalScope(const KURL& scriptURL, const String& userAgent, const String& sourceCode, WorkerThreadStartMode) override;
    void terminateWorkerGlobalScope() override;
    void postMessageToWorkerGlobalScope(PassRefPtr<SerializedScriptValue>, PassOwnPtr<MessagePortChannelArray>) override;
    bool hasPendingActivity() const override;
    void workerObjectDestroyed() 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, int exceptionId);
    void reportConsoleMessage(MessageSource, MessageLevel, const String& message, int lineNumber, const String& sourceURL);
    void postMessageToPageInspector(const String&);
    void postWorkerConsoleAgentEnabled();
    WorkerInspectorProxy* workerInspectorProxy();
    void confirmMessageFromWorkerObject(bool hasPendingActivity);
    void reportPendingActivity(bool hasPendingActivity);
    void workerGlobalScopeClosed();
    void workerThreadTerminated();

    void workerThreadCreated(PassRefPtr<WorkerThread>);

    ExecutionContext* executionContext() const { return m_executionContext.get(); }

protected:
    WorkerMessagingProxy(InProcessWorkerBase*, PassOwnPtrWillBeRawPtr<WorkerClients>);
    ~WorkerMessagingProxy() override;

    virtual PassRefPtr<WorkerThread> createWorkerThread(double originTime) = 0;

    PassRefPtr<WorkerLoaderProxy> loaderProxy() { return m_loaderProxy; }
    WorkerObjectProxy& workerObjectProxy() { return *m_workerObjectProxy.get(); }

private:
    void workerObjectDestroyedInternal();
    void terminateInternally();

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

    RefPtrWillBePersistent<ExecutionContext> m_executionContext;
    OwnPtr<WorkerObjectProxy> m_workerObjectProxy;
    WeakPersistent<InProcessWorkerBase> m_workerObject;
    bool m_mayBeDestroyed;
    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<OwnPtr<ExecutionContextTask>> m_queuedEarlyTasks; // Tasks are queued here until there's a thread object created.
    OwnPtrWillBePersistent<WorkerInspectorProxy> m_workerInspectorProxy;

    OwnPtrWillBePersistent<WorkerClients> m_workerClients;

    RefPtr<WorkerLoaderProxy> m_loaderProxy;
};

} // namespace blink

#endif // WorkerMessagingProxy_h