001 /**
002 *
003 * Copyright 2004 Protique Ltd
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 *
017 **/
018 package org.activemq.util;
019
020 import org.apache.log4j.AppenderSkeleton;
021 import org.apache.log4j.spi.LoggingEvent;
022
023 import javax.jms.Connection;
024 import javax.jms.Destination;
025 import javax.jms.JMSException;
026 import javax.jms.Message;
027 import javax.jms.MessageProducer;
028 import javax.jms.Session;
029 import javax.naming.NamingException;
030 import java.io.Serializable;
031 import java.util.ArrayList;
032 import java.util.Iterator;
033 import java.util.List;
034
035 /**
036 * An abstract base class for implementation inheritence for a log4j JMS appender
037 *
038 * @version $Revision: 1.1.1.1 $
039 */
040 public abstract class JmsLogAppenderSupport extends AppenderSkeleton {
041
042 public static final int JMS_PUBLISH_ERROR_CODE = 61616;
043
044 private Connection connection;
045 private Session session;
046 private MessageProducer producer;
047 private boolean allowTextMessages = true;
048 private String subjectPrefix = "log4j.";
049
050 public JmsLogAppenderSupport() {
051 }
052
053 public Connection getConnection() throws JMSException, NamingException {
054 if (connection == null) {
055 connection = createConnection();
056 }
057 return connection;
058 }
059
060 public void setConnection(Connection connection) {
061 this.connection = connection;
062 }
063
064 public Session getSession() throws JMSException, NamingException {
065 if (session == null) {
066 session = createSession();
067 }
068 return session;
069 }
070
071 public void setSession(Session session) {
072 this.session = session;
073 }
074
075 public MessageProducer getProducer() throws JMSException, NamingException {
076 if (producer == null) {
077 producer = createProducer();
078 }
079 return producer;
080 }
081
082 public void setProducer(MessageProducer producer) {
083 this.producer = producer;
084 }
085
086 public void close() {
087 List errors = new ArrayList();
088 if (producer != null) {
089 try {
090 producer.close();
091 }
092 catch (JMSException e) {
093 errors.add(e);
094 }
095 }
096 if (session != null) {
097 try {
098 session.close();
099 }
100 catch (JMSException e) {
101 errors.add(e);
102 }
103 }
104 if (connection != null) {
105 try {
106 connection.close();
107 }
108 catch (JMSException e) {
109 errors.add(e);
110 }
111 }
112 for (Iterator iter = errors.iterator(); iter.hasNext();) {
113 JMSException e = (JMSException) iter.next();
114 getErrorHandler().error("Error closing JMS resources: " + e, e, JMS_PUBLISH_ERROR_CODE);
115 }
116 }
117
118 public boolean requiresLayout() {
119 return false;
120 }
121
122 public void activateOptions() {
123 try {
124 // lets ensure we're all created
125 getProducer();
126 }
127 catch (Exception e) {
128 getErrorHandler().error("Could not create JMS resources: " + e, e, JMS_PUBLISH_ERROR_CODE);
129 }
130 }
131
132
133 // Implementation methods
134 //-------------------------------------------------------------------------
135 protected abstract Connection createConnection() throws JMSException, NamingException;
136
137 protected Session createSession() throws JMSException, NamingException {
138 return getConnection().createSession(false, Session.AUTO_ACKNOWLEDGE);
139 }
140
141 protected MessageProducer createProducer() throws JMSException, NamingException {
142 return getSession().createProducer(null);
143 }
144
145 protected void append(LoggingEvent event) {
146 System.out.println("#### Calling append with event: " + event);
147 try {
148 Message message = createMessage(event);
149 Destination destination = getDestination(event);
150 getProducer().send(destination, message);
151 }
152 catch (Exception e) {
153 getErrorHandler().error("Could not send message due to: " + e, e, JMS_PUBLISH_ERROR_CODE, event);
154 }
155 }
156
157 protected Message createMessage(LoggingEvent event) throws JMSException, NamingException {
158 Message answer = null;
159 Object value = event.getMessage();
160 if (allowTextMessages && value instanceof String) {
161 answer = getSession().createTextMessage((String) value);
162 }
163 else {
164 answer = getSession().createObjectMessage((Serializable) value);
165 }
166 answer.setStringProperty("level", event.getLevel().toString());
167 answer.setIntProperty("levelInt", event.getLevel().toInt());
168 answer.setStringProperty("threadName", event.getThreadName());
169 return answer;
170 }
171
172 protected Destination getDestination(LoggingEvent event) throws JMSException, NamingException {
173 String name = subjectPrefix + event.getLoggerName();
174 return getSession().createTopic(name);
175 }
176 }