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 start and stop events.
040: */
041: public class StartListener implements EnvironmentListener {
042: private static final L10N L = new L10N(StartListener.class);
043: private static final Logger log = Log.open(StartListener.class);
044:
045: private Object _resource;
046:
047: /**
048: * Creates the new start listener.
049: *
050: * @param resource the resource which needs start/stop
051: */
052: public StartListener(Object resource) {
053: _resource = resource;
054: }
055:
056: /**
057: * Configuration callback
058: */
059: public void environmentConfig(EnvironmentClassLoader loader) {
060: }
061:
062: /**
063: * Handles the case where a class loader is activated.
064: */
065: public void environmentStart(EnvironmentClassLoader loader) {
066: Method start = getStartMethod(_resource.getClass());
067:
068: if (start == null)
069: return;
070:
071: try {
072: start.invoke(_resource);
073: } catch (Throwable e) {
074: log.log(Level.WARNING, e.toString(), e);
075: }
076: }
077:
078: /**
079: * Handles the case where a class loader is dropped.
080: */
081: public void environmentStop(EnvironmentClassLoader loader) {
082: Method stop = getStopMethod(_resource.getClass());
083:
084: if (stop == null)
085: return;
086:
087: try {
088: stop.invoke(_resource);
089: } catch (Throwable e) {
090: log.log(Level.WARNING, e.toString(), e);
091: }
092: }
093:
094: public static Method getStartMethod(Class cl) {
095: try {
096: return cl.getMethod("start", new Class[0]);
097: } catch (Throwable e) {
098: }
099:
100: return null;
101: }
102:
103: public static Method getStopMethod(Class cl) {
104: try {
105: return cl.getMethod("stop", new Class[0]);
106: } catch (Throwable e) {
107: }
108:
109: return null;
110: }
111: }
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