/*
 * 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 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 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 LocalStorageThread_h
#define LocalStorageThread_h

#include <wtf/HashSet.h>
#include <wtf/MessageQueue.h>
#include <wtf/PassRefPtr.h>
#include <wtf/Threading.h>

namespace WebCore {

    class LocalStorage;
    class LocalStorageArea;
    class LocalStorageTask;

    class LocalStorageThread : public ThreadSafeShared<LocalStorageThread> {
    public:
        static PassRefPtr<LocalStorageThread> create();

        bool start();

        void scheduleImport(PassRefPtr<LocalStorage>);
        void scheduleSync(PassRefPtr<LocalStorage>);
        void scheduleImport(PassRefPtr<LocalStorageArea>);
        void scheduleSync(PassRefPtr<LocalStorageArea>);

        // Called from the main thread to synchronously shut down this thread
        void terminate();
        // Background thread part of the terminate procedure
        void performTerminate();

    private:
        LocalStorageThread();

        static void* localStorageThreadStart(void*);
        void* localStorageThread();

        Mutex m_threadCreationMutex;
        ThreadIdentifier m_threadID;
        RefPtr<LocalStorageThread> m_selfRef;

        MessageQueue<RefPtr<LocalStorageTask> > m_queue;
        
        Mutex m_terminateLock;
        ThreadCondition m_terminateCondition;
    };

} // namespace WebCore

#endif // LocalStorageThread_h