/*

 * Copyright (C) 2010 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. AND ITS CONTRIBUTORS ``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 ITS 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 "ResponsivenessTimer.h"

#include "WorkItem.h"

namespace WebKit {

static const double kResponsivenessTimeout = 3;

ResponsivenessTimer::ResponsivenessTimer(ResponsivenessTimer::Client* client)

    : m_client(client)

    , m_isResponsive(true)

    , m_timer(RunLoop::main(), this, &ResponsivenessTimer::timerFired)

{

}

ResponsivenessTimer::~ResponsivenessTimer()

{

    m_timer.stop();

}

void ResponsivenessTimer::invalidate()

{

    m_timer.stop();

}

void ResponsivenessTimer::timerFired()

{

    // We'll never schedule the timer unless we're responsive.

    ASSERT(m_isResponsive);

    m_isResponsive = false;

    m_client->didBecomeUnresponsive(this);

    m_timer.stop();

}

void ResponsivenessTimer::start()

{

    if (m_timer.isActive())

        return;

    if (!m_isResponsive)

        return;

    m_timer.startOneShot(kResponsivenessTimeout);

}

void ResponsivenessTimer::stop()

{

    if (!m_isResponsive) {

        // We got a life sign from the web process!

        m_client->didBecomeResponsive(this);

        m_isResponsive = true;

    }

    m_timer.stop();

}

} // namespace WebKit