1 //
2 // ========================================================================
3 // Copyright (c) 1995-2016 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
20 package org.eclipse.jetty.util.preventers;
21
22 import org.eclipse.jetty.util.component.AbstractLifeCycle;
23 import org.eclipse.jetty.util.log.Log;
24 import org.eclipse.jetty.util.log.Logger;
25
26 /**
27 * AbstractLeakPreventer
28 *
29 * Abstract base class for code that seeks to avoid pinning of webapp classloaders by using the jetty classloader to
30 * proactively call the code that pins them (generally pinned as static data members, or as static
31 * data members that are daemon threads (which use the context classloader)).
32 *
33 * Instances of subclasses of this class should be set with Server.addBean(), which will
34 * ensure that they are called when the Server instance starts up, which will have the jetty
35 * classloader in scope.
36 *
37 */
38 public abstract class AbstractLeakPreventer extends AbstractLifeCycle
39 {
40 protected static final Logger LOG = Log.getLogger(AbstractLeakPreventer.class);
41
42 /* ------------------------------------------------------------ */
43 abstract public void prevent(ClassLoader loader);
44
45
46 /* ------------------------------------------------------------ */
47 @Override
48 protected void doStart() throws Exception
49 {
50 ClassLoader loader = Thread.currentThread().getContextClassLoader();
51 try
52 {
53 Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
54 prevent(getClass().getClassLoader());
55 super.doStart();
56 }
57 finally
58 {
59 Thread.currentThread().setContextClassLoader(loader);
60 }
61 }
62 }