| 1 | // Copyright 2004-2007 Jean-Francois Poilpret |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package net.sourceforge.hiveutils.web.util; |
| 16 | |
| 17 | import java.text.MessageFormat; |
| 18 | |
| 19 | import javax.servlet.http.HttpSession; |
| 20 | import javax.servlet.http.HttpSessionEvent; |
| 21 | import javax.servlet.http.HttpSessionListener; |
| 22 | |
| 23 | import org.apache.commons.logging.Log; |
| 24 | import org.apache.commons.logging.LogFactory; |
| 25 | |
| 26 | /** |
| 27 | * SessionListener that logs all session creation/destruction, including the |
| 28 | * the duration of activity of each session. |
| 29 | * |
| 30 | * @author Jean-Francois Poilpret |
| 31 | */ |
| 32 | public class LoggingSessionListener implements HttpSessionListener |
| 33 | { |
| 34 | static private final Log _logger = LogFactory.getLog(LoggingSessionListener.class); |
| 35 | static private final String CREATE = "Session id <{0}> created (total sessions = {1})"; |
| 36 | static private final String DESTROY = "Session id <{0}> destroyed (lifetime = {2} ms; " + |
| 37 | "inactive during {3} ms; total sessions = {1})"; |
| 38 | |
| 39 | public void sessionCreated(HttpSessionEvent e) |
| 40 | { |
| 41 | _activeSessions++; |
| 42 | if (_logger.isDebugEnabled()) |
| 43 | { |
| 44 | HttpSession session = e.getSession(); |
| 45 | Object[] args = new Object[] {session.getId(), _activeSessions}; |
| 46 | String message = getCreationFormatter().format( |
| 47 | args, new StringBuffer(), null).toString(); |
| 48 | _logger.debug(message); |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | public void sessionDestroyed(HttpSessionEvent e) |
| 53 | { |
| 54 | _activeSessions--; |
| 55 | if (_logger.isDebugEnabled()) |
| 56 | { |
| 57 | HttpSession session = e.getSession(); |
| 58 | long now = System.currentTimeMillis(); |
| 59 | long activeTime = now - session.getCreationTime(); |
| 60 | long lastTime = now - session.getLastAccessedTime(); |
| 61 | Object[] args = new Object[] { session.getId(), |
| 62 | _activeSessions, |
| 63 | activeTime, |
| 64 | lastTime}; |
| 65 | String message = getDestructionFormatter().format( |
| 66 | args, new StringBuffer(), null).toString(); |
| 67 | _logger.debug(message); |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | protected MessageFormat getCreationFormatter() |
| 72 | { |
| 73 | if (_creationFormatter == null) |
| 74 | { |
| 75 | _creationFormatter = new MessageFormat(CREATE); |
| 76 | } |
| 77 | return _creationFormatter; |
| 78 | } |
| 79 | |
| 80 | protected MessageFormat getDestructionFormatter() |
| 81 | { |
| 82 | if (_destructionFormatter == null) |
| 83 | { |
| 84 | _destructionFormatter = new MessageFormat(DESTROY); |
| 85 | } |
| 86 | return _destructionFormatter; |
| 87 | } |
| 88 | |
| 89 | protected MessageFormat _creationFormatter; |
| 90 | protected MessageFormat _destructionFormatter; |
| 91 | protected int _activeSessions = 0; |
| 92 | } |