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/*
* Copyright (C) 2009 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 "PluginHalter.h"
#include "HaltablePlugin.h"
#include <wtf/CurrentTime.h>
#include <wtf/Vector.h>
using namespace std;
namespace WebCore {
PluginHalter::PluginHalter(PluginHalterClient* client)
: m_client(client)
, m_timer(this, &PluginHalter::timerFired)
, m_pluginAllowedRunTime(numeric_limits<unsigned>::max())
{
ASSERT_ARG(client, client);
}
void PluginHalter::didStartPlugin(HaltablePlugin* obj)
{
ASSERT_ARG(obj, obj);
ASSERT_ARG(obj, !m_plugins.contains(obj));
if (!m_client->enabled())
return;
double currentTime = WTF::currentTime();
m_plugins.add(obj, currentTime);
if (m_plugins.size() == 1)
m_oldestStartTime = currentTime;
startTimerIfNecessary();
}
void PluginHalter::didStopPlugin(HaltablePlugin* obj)
{
if (!m_client->enabled())
return;
m_plugins.remove(obj);
}
void PluginHalter::timerFired(Timer<PluginHalter>*)
{
if (m_plugins.isEmpty())
return;
Vector<HaltablePlugin*> plugins;
copyKeysToVector(m_plugins, plugins);
// Plug-ins older than this are candidates to be halted.
double pluginCutOffTime = WTF::currentTime() - m_pluginAllowedRunTime;
m_oldestStartTime = numeric_limits<double>::max();
for (size_t i = 0; i < plugins.size(); ++i) {
double thisStartTime = m_plugins.get(plugins[i]);
if (thisStartTime > pluginCutOffTime) {
// This plug-in is too young to be halted. We find the oldest
// plug-in that is not old enough to be halted and use it to set
// the timer's next fire time.
if (thisStartTime < m_oldestStartTime)
m_oldestStartTime = thisStartTime;
continue;
}
if (m_client->shouldHaltPlugin(plugins[i]->node()))
plugins[i]->halt();
m_plugins.remove(plugins[i]);
}
startTimerIfNecessary();
}
void PluginHalter::startTimerIfNecessary()
{
if (m_timer.isActive())
return;
if (m_plugins.isEmpty())
return;
double nextFireInterval = static_cast<double>(m_pluginAllowedRunTime) - (currentTime() - m_oldestStartTime);
m_timer.startOneShot(nextFireInterval < 0 ? 0 : nextFireInterval);
}
} // namespace WebCore
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