/*
 * Copyright (C) 2010 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * OWNER 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "bindings/core/v8/V8GCForContextDispose.h"

#include "bindings/core/v8/V8PerIsolateData.h"
#include "public/platform/Platform.h"
#include "wtf/CurrentTime.h"
#include "wtf/StdLibExtras.h"
#include <v8.h>

namespace blink {

V8GCForContextDispose::V8GCForContextDispose()
    : m_pseudoIdleTimer(this, &V8GCForContextDispose::pseudoIdleTimerFired)
{
    reset();
}

void V8GCForContextDispose::notifyContextDisposed(bool isMainFrame)
{
    m_didDisposeContextForMainFrame = isMainFrame;
    m_lastContextDisposalTime = WTF::currentTime();
    V8PerIsolateData::mainThreadIsolate()->ContextDisposedNotification(!isMainFrame);
    if (m_pseudoIdleTimer.isActive())
        m_pseudoIdleTimer.stop();
}

void V8GCForContextDispose::notifyIdle()
{
    double maxTimeSinceLastContextDisposal = .2;
    if (!m_didDisposeContextForMainFrame && !m_pseudoIdleTimer.isActive() && m_lastContextDisposalTime + maxTimeSinceLastContextDisposal >= WTF::currentTime()) {
        m_pseudoIdleTimer.startOneShot(0, BLINK_FROM_HERE);
    }
}

V8GCForContextDispose& V8GCForContextDispose::instance()
{
    DEFINE_STATIC_LOCAL(V8GCForContextDispose, staticInstance, ());
    return staticInstance;
}

void V8GCForContextDispose::pseudoIdleTimerFired(Timer<V8GCForContextDispose>*)
{
    V8PerIsolateData::mainThreadIsolate()->IdleNotificationDeadline(Platform::current()->monotonicallyIncreasingTimeSeconds());
    reset();
}

void V8GCForContextDispose::reset()
{
    m_didDisposeContextForMainFrame = false;
    m_lastContextDisposalTime = -1;
}

} // namespace blink