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1
18 package org.apache.activemq.util;
19
20 import org.apache.log4j.AppenderSkeleton;
21 import org.apache.log4j.spi.LoggingEvent;
22
23 import javax.jms.Connection  ;
24 import javax.jms.Destination ;
25 import javax.jms.JMSException ;
26 import javax.jms.Message ;
27 import javax.jms.MessageProducer ;
28 import javax.jms.Session ;
29 import javax.naming.NamingException ;
30 import java.io.Serializable ;
31 import java.util.ArrayList ;
32 import java.util.Iterator ;
33 import java.util.List ;
34
35
40 public abstract class JmsLogAppenderSupport extends AppenderSkeleton {
41
42 public static final int JMS_PUBLISH_ERROR_CODE = 61616;
43
44 private Connection connection;
45 private Session session;
46 private MessageProducer producer;
47 private boolean allowTextMessages = true;
48 private String subjectPrefix = "log4j.";
49
50 public JmsLogAppenderSupport() {
51 }
52
53 public Connection getConnection() throws JMSException , NamingException {
54 if (connection == null) {
55 connection = createConnection();
56 }
57 return connection;
58 }
59
60 public void setConnection(Connection connection) {
61 this.connection = connection;
62 }
63
64 public Session getSession() throws JMSException , NamingException {
65 if (session == null) {
66 session = createSession();
67 }
68 return session;
69 }
70
71 public void setSession(Session session) {
72 this.session = session;
73 }
74
75 public MessageProducer getProducer() throws JMSException , NamingException {
76 if (producer == null) {
77 producer = createProducer();
78 }
79 return producer;
80 }
81
82 public void setProducer(MessageProducer producer) {
83 this.producer = producer;
84 }
85
86 public void close() {
87 List errors = new ArrayList ();
88 if (producer != null) {
89 try {
90 producer.close();
91 }
92 catch (JMSException e) {
93 errors.add(e);
94 }
95 }
96 if (session != null) {
97 try {
98 session.close();
99 }
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 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 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 try {
147 Message message = createMessage(event);
148 Destination destination = getDestination(event);
149 getProducer().send(destination, message);
150 }
151 catch (Exception e) {
152 getErrorHandler().error("Could not send message due to: " + e, e, JMS_PUBLISH_ERROR_CODE, event);
153 }
154 }
155
156 protected Message createMessage(LoggingEvent event) throws JMSException , NamingException {
157 Message answer = null;
158 Object value = event.getMessage();
159 if (allowTextMessages && value instanceof String ) {
160 answer = getSession().createTextMessage((String ) value);
161 }
162 else {
163 answer = getSession().createObjectMessage((Serializable ) value);
164 }
165 answer.setStringProperty("level", event.getLevel().toString());
166 answer.setIntProperty("levelInt", event.getLevel().toInt());
167 answer.setStringProperty("threadName", event.getThreadName());
168 return answer;
169 }
170
171 protected Destination getDestination(LoggingEvent event) throws JMSException , NamingException {
172 String name = subjectPrefix + event.getLoggerName();
173 return getSession().createTopic(name);
174 }
175 }
176 |
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