Jake Slack | 03928ae | 2014-05-13 18:41:56 -0700 | [diff] [blame] | 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 | |
| 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 | } |