/*

 * 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. 

 */

#include "config.h"

#include "PluginMainThreadScheduler.h"

#include <wtf/StdLibExtras.h>

namespace WebCore {

PluginMainThreadScheduler& PluginMainThreadScheduler::scheduler()

{

    DEFINE_STATIC_LOCAL(PluginMainThreadScheduler, scheduler, ());

    return scheduler;

}

PluginMainThreadScheduler::PluginMainThreadScheduler()

    : m_callPending(false)

{

}

void PluginMainThreadScheduler::scheduleCall(NPP npp, MainThreadFunction function, void* userData)

{

    MutexLocker lock(m_queueMutex);

    CallQueueMap::iterator it = m_callQueueMap.find(npp);

    if (it == m_callQueueMap.end())

        return;

    it->second.append(Call(function, userData));

    if (!m_callPending) {

        callOnMainThread(mainThreadCallback, this);

        m_callPending = true;

    }

}

void PluginMainThreadScheduler::registerPlugin(NPP npp)

{

    MutexLocker lock(m_queueMutex);

    ASSERT(!m_callQueueMap.contains(npp));

    m_callQueueMap.set(npp, Deque<Call>());

}

void PluginMainThreadScheduler::unregisterPlugin(NPP npp)

{

    MutexLocker lock(m_queueMutex);

    ASSERT(m_callQueueMap.contains(npp));

    m_callQueueMap.remove(npp);

}

void PluginMainThreadScheduler::dispatchCallsForPlugin(NPP npp, const Deque<Call>& calls)

{

    Deque<Call>::const_iterator end = calls.end();

    for (Deque<Call>::const_iterator it = calls.begin(); it != end; ++it) {

        // Check if the plug-in has been destroyed.

        {

            MutexLocker lock(m_queueMutex);

            if (!m_callQueueMap.contains(npp))

                return;

        }

        (*it).performCall();

    }

}

void PluginMainThreadScheduler::dispatchCalls()

{

    m_queueMutex.lock();

    CallQueueMap copy(m_callQueueMap);

    {

        // Empty all the queues in the original map

        CallQueueMap::iterator end = m_callQueueMap.end();

        for (CallQueueMap::iterator it = m_callQueueMap.begin(); it != end; ++it)

            it->second.clear();

    }

    m_callPending = false;

    m_queueMutex.unlock();

    CallQueueMap::iterator end = copy.end();

    for (CallQueueMap::iterator it = copy.begin(); it != end; ++it)

        dispatchCallsForPlugin(it->first, it->second);

}

void PluginMainThreadScheduler::mainThreadCallback(void* context)

{

    static_cast<PluginMainThreadScheduler*>(context)->dispatchCalls();

}

} // namespace WebCore