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comparison src/org/eclipse/jetty/util/preventers/GCThreadLeakPreventer.java @ 802:3428c60d7cfc

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replace jetty jars with source
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 07 Sep 2016 21:15:48 -0600
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801:6a21393191c1 802:3428c60d7cfc
1 //
2 // ========================================================================
3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
4 // ------------------------------------------------------------------------
5 // All rights reserved. This program and the accompanying materials
6 // are made available under the terms of the Eclipse Public License v1.0
7 // and Apache License v2.0 which accompanies this distribution.
8 //
9 // The Eclipse Public License is available at
10 // http://www.eclipse.org/legal/epl-v10.html
11 //
12 // The Apache License v2.0 is available at
13 // http://www.opensource.org/licenses/apache2.0.php
14 //
15 // You may elect to redistribute this code under either of these licenses.
16 // ========================================================================
17 //
18
19 package org.eclipse.jetty.util.preventers;
20
21 import java.lang.reflect.Method;
22
23 /**
24 * GCThreadLeakPreventer
25 *
26 * Prevents a call to sun.misc.GC.requestLatency pinning a webapp classloader
27 * by calling it with a non-webapp classloader. The problem appears to be that
28 * when this method is called, a daemon thread is created which takes the
29 * context classloader. A known caller of this method is the RMI impl. See
30 * http://stackoverflow.com/questions/6626680/does-java-garbage-collection-log-entry-full-gc-system-mean-some-class-called
31 *
32 * This preventer will start the thread with the longest possible interval, although
33 * subsequent calls can vary that. Recommend to only use this class if you're doing
34 * RMI.
35 *
36 * Inspired by Tomcat JreMemoryLeakPrevention.
37 *
38 */
39 public class GCThreadLeakPreventer extends AbstractLeakPreventer
40 {
41 /* ------------------------------------------------------------ */
42 /**
43 * @see org.eclipse.jetty.util.preventers.AbstractLeakPreventer#prevent(java.lang.ClassLoader)
44 */
45 @Override
46 public void prevent(ClassLoader loader)
47 {
48 try
49 {
50 Class clazz = Class.forName("sun.misc.GC");
51 Method requestLatency = clazz.getMethod("requestLatency", new Class[] {long.class});
52 requestLatency.invoke(null, Long.valueOf(Long.MAX_VALUE-1));
53 }
54 catch (ClassNotFoundException e)
55 {
56 LOG.ignore(e);
57 }
58 catch (Exception e)
59 {
60 LOG.warn(e);
61 }
62 }
63
64 }