org.eclipse.jetty.util.preventers.AbstractLeakPreventer Maven / Gradle / Ivy
//
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// Copyright (c) 1995-2018 Mort Bay Consulting Pty. Ltd.
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// 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
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// You may elect to redistribute this code under either of these licenses.
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//
package org.eclipse.jetty.util.preventers;
import org.eclipse.jetty.util.component.AbstractLifeCycle;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/**
* AbstractLeakPreventer
*
* Abstract base class for code that seeks to avoid pinning of webapp classloaders by using the jetty classloader to
* proactively call the code that pins them (generally pinned as static data members, or as static
* data members that are daemon threads (which use the context classloader)).
*
* Instances of subclasses of this class should be set with Server.addBean(), which will
* ensure that they are called when the Server instance starts up, which will have the jetty
* classloader in scope.
*
*/
public abstract class AbstractLeakPreventer extends AbstractLifeCycle
{
protected static final Logger LOG = Log.getLogger(AbstractLeakPreventer.class);
/* ------------------------------------------------------------ */
abstract public void prevent(ClassLoader loader);
/* ------------------------------------------------------------ */
@Override
protected void doStart() throws Exception
{
ClassLoader loader = Thread.currentThread().getContextClassLoader();
try
{
Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
prevent(getClass().getClassLoader());
super.doStart();
}
finally
{
Thread.currentThread().setContextClassLoader(loader);
}
}
}