001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache license, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. 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 package org.apache.logging.log4j.core.net.jms; 018 019 import java.io.BufferedReader; 020 import java.io.InputStreamReader; 021 import java.nio.charset.Charset; 022 023 import javax.jms.JMSException; 024 import javax.jms.Session; 025 import javax.jms.Topic; 026 import javax.jms.TopicConnection; 027 import javax.jms.TopicConnectionFactory; 028 import javax.jms.TopicSession; 029 import javax.jms.TopicSubscriber; 030 import javax.naming.Context; 031 import javax.naming.InitialContext; 032 import javax.naming.NamingException; 033 034 /** 035 * Receives Topic messages that contain LogEvents. This implementation expects that all messages 036 * are serialized log events. 037 */ 038 public class JmsTopicReceiver extends AbstractJmsReceiver { 039 040 /** 041 * Constructor. 042 * @param tcfBindingName The TopicConnectionFactory binding name. 043 * @param topicBindingName The Topic binding name. 044 * @param username The userid to connect to the topic. 045 * @param password The password to connect to the topic. 046 */ 047 public JmsTopicReceiver(final String tcfBindingName, final String topicBindingName, final String username, 048 final String password) { 049 try { 050 final Context ctx = new InitialContext(); 051 TopicConnectionFactory topicConnectionFactory; 052 topicConnectionFactory = (TopicConnectionFactory) lookup(ctx, tcfBindingName); 053 final TopicConnection topicConnection = topicConnectionFactory.createTopicConnection(username, password); 054 topicConnection.start(); 055 final TopicSession topicSession = topicConnection.createTopicSession(false, Session.AUTO_ACKNOWLEDGE); 056 final Topic topic = (Topic) ctx.lookup(topicBindingName); 057 final TopicSubscriber topicSubscriber = topicSession.createSubscriber(topic); 058 topicSubscriber.setMessageListener(this); 059 } catch (final JMSException e) { 060 logger.error("Could not read JMS message.", e); 061 } catch (final NamingException e) { 062 logger.error("Could not read JMS message.", e); 063 } catch (final RuntimeException e) { 064 logger.error("Could not read JMS message.", e); 065 } 066 } 067 068 /** 069 * Main startup for the receiver. 070 * @param args The command line arguments. 071 * @throws Exception if an error occurs. 072 */ 073 public static void main(final String[] args) throws Exception { 074 if (args.length != 4) { 075 usage("Wrong number of arguments."); 076 } 077 078 final String tcfBindingName = args[0]; 079 final String topicBindingName = args[1]; 080 final String username = args[2]; 081 final String password = args[3]; 082 083 new JmsTopicReceiver(tcfBindingName, topicBindingName, username, password); 084 085 final Charset enc = Charset.defaultCharset(); 086 final BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in, enc)); 087 // Loop until the word "exit" is typed 088 System.out.println("Type \"exit\" to quit JmsTopicReceiver."); 089 while (true) { 090 final String line = stdin.readLine(); 091 if (line == null || line.equalsIgnoreCase("exit")) { 092 System.out.println("Exiting. Kill the application if it does not exit " 093 + "due to daemon threads."); 094 return; 095 } 096 } 097 } 098 099 private static void usage(final String msg) { 100 System.err.println(msg); 101 System.err.println("Usage: java " + JmsTopicReceiver.class.getName() 102 + " TopicConnectionFactoryBindingName TopicBindingName username password"); 103 System.exit(1); 104 } 105 }