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//
// ========================================================================
// Copyright (c) 1995-2015 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.util.preventers;
import java.lang.reflect.Method;
/**
* GCThreadLeakPreventer
*
* Prevents a call to sun.misc.GC.requestLatency pinning a webapp classloader
* by calling it with a non-webapp classloader. The problem appears to be that
* when this method is called, a daemon thread is created which takes the
* context classloader. A known caller of this method is the RMI impl. See
* http://stackoverflow.com/questions/6626680/does-java-garbage-collection-log-entry-full-gc-system-mean-some-class-called
*
* This preventer will start the thread with the longest possible interval, although
* subsequent calls can vary that. Recommend to only use this class if you're doing
* RMI.
*
* Inspired by Tomcat JreMemoryLeakPrevention.
*
*/
public class GCThreadLeakPreventer extends AbstractLeakPreventer
{
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.util.preventers.AbstractLeakPreventer#prevent(java.lang.ClassLoader)
*/
@Override
public void prevent(ClassLoader loader)
{
try
{
Class<?> clazz = Class.forName("sun.misc.GC");
Method requestLatency = clazz.getMethod("requestLatency", new Class[] {long.class});
requestLatency.invoke(null, Long.valueOf(Long.MAX_VALUE-1));
}
catch (ClassNotFoundException e)
{
LOG.ignore(e);
}
catch (Exception e)
{
LOG.warn(e);
}
}
}
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