001: /*
002: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003: *
004: * This file is part of Resin(R) Open Source
005: *
006: * Each copy or derived work must preserve the copyright notice and this
007: * notice unmodified.
008: *
009: * Resin Open Source is free software; you can redistribute it and/or modify
010: * it under the terms of the GNU General Public License as published by
011: * the Free Software Foundation; either version 2 of the License, or
012: * (at your option) any later version.
013: *
014: * Resin Open Source is distributed in the hope that it will be useful,
015: * but WITHOUT ANY WARRANTY; without even the implied warranty of
016: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017: * of NON-INFRINGEMENT. See the GNU General Public License for more
018: * details.
019: *
020: * You should have received a copy of the GNU General Public License
021: * along with Resin Open Source; if not, write to the
022: * Free SoftwareFoundation, Inc.
023: * 59 Temple Place, Suite 330
024: * Boston, MA 02111-1307 USA
025: *
026: * @author Scott Ferguson
027: */
028:
029: package com.caucho.loader;
030:
031: import com.caucho.log.Log;
032: import com.caucho.util.L10N;
033:
034: import java.lang.reflect.Method;
035: import java.util.logging.Level;
036: import java.util.logging.Logger;
037:
038: /**
039: * Waits for the close event and calls a destroy() method.
040: */
041: public class CloseListener implements ClassLoaderListener {
042: private static final L10N L = new L10N(CloseListener.class);
043: private static final Logger log = Log.open(CloseListener.class);
044:
045: private Object _resource;
046:
047: /**
048: * Creates the new close listener.
049: *
050: * @param resource the resource which needs closing
051: */
052: public CloseListener(Object resource) {
053: _resource = resource;
054: }
055:
056: /**
057: * Handles the case where a class loader is activated.
058: */
059: public void classLoaderInit(DynamicClassLoader loader) {
060: }
061:
062: /**
063: * Handles the case where a class loader is dropped.
064: */
065: public void classLoaderDestroy(DynamicClassLoader loader) {
066: Method destroy = getDestroyMethod(_resource.getClass());
067:
068: if (destroy == null)
069: return;
070:
071: try {
072: destroy.invoke(_resource, (Object[]) null);
073: } catch (Throwable e) {
074: log.log(Level.WARNING, e.toString(), e);
075: }
076: }
077:
078: public static Method getDestroyMethod(Class cl) {
079: try {
080: return cl.getMethod("destroy", new Class[0]);
081: } catch (Throwable e) {
082: }
083:
084: try {
085: return cl.getMethod("close", new Class[0]);
086: } catch (Throwable e) {
087: }
088:
089: try {
090: return cl.getMethod("stop", new Class[0]);
091: } catch (Throwable e) {
092: }
093:
094: return null;
095: }
096:
097: public String toString() {
098: return "CloseListener[" + _resource + "]";
099: }
100: }
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