001 /** 002 * 003 * Copyright 2005 LogicBlaze, Inc. 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.logicblaze.lingo.jms.impl; 019 020 import org.logicblaze.lingo.jms.JmsProducer; 021 import org.logicblaze.lingo.jms.Requestor; 022 import org.apache.commons.logging.Log; 023 import org.apache.commons.logging.LogFactory; 024 025 import javax.jms.Destination; 026 import javax.jms.JMSException; 027 import javax.jms.Message; 028 import javax.jms.Session; 029 import javax.jms.DeliveryMode; 030 031 /** 032 * A simple requestor which only supports one-way and so does not need a consumer. 033 * 034 * @version $Revision: 1.2 $ 035 */ 036 public class OneWayRequestor implements Requestor { 037 private static final Log log = LogFactory.getLog(OneWayRequestor.class); 038 039 private JmsProducer producer; 040 private Destination serverDestination; 041 private long counter; 042 private int deliveryMode = DeliveryMode.NON_PERSISTENT; 043 private int priority = 5; 044 private long timeToLive = 30000; 045 046 public OneWayRequestor(JmsProducer producer, Destination serverDestination) { 047 this.producer = producer; 048 this.serverDestination = serverDestination; 049 } 050 051 /** 052 * The default delivery mode of request messages 053 */ 054 public int getDeliveryMode() { 055 return deliveryMode; 056 } 057 058 public void setDeliveryMode(int deliveryMode) { 059 this.deliveryMode = deliveryMode; 060 } 061 062 /** 063 * The default priority of request messages 064 */ 065 public int getPriority() { 066 return priority; 067 } 068 069 public void setPriority(int priority) { 070 this.priority = priority; 071 } 072 073 /** 074 * The default time to live on request messages 075 */ 076 public long getTimeToLive() { 077 return timeToLive; 078 } 079 080 /** 081 * Sets the maximum time to live for requests 082 */ 083 public void setTimeToLive(long timeToLive) { 084 this.timeToLive = timeToLive; 085 } 086 087 public void oneWay(Destination destination, Message message) throws JMSException { 088 oneWay(destination, message, timeToLive); 089 } 090 091 public void oneWay(Destination destination, Message message, long timeToLive) throws JMSException { 092 populateHeaders(message); 093 doSend(destination, message, timeToLive); 094 } 095 096 public Session getSession() { 097 return producer.getSession(); 098 } 099 100 public void close() throws JMSException { 101 producer.close(); 102 } 103 104 public Message receive(long timeout) throws JMSException { 105 throw new JMSException("receive(timeToLive) not implemented for OneWayRequestor"); 106 } 107 108 public Message request(Destination destination, Message message) throws JMSException { 109 throw new JMSException("request() not implemented for OneWayRequestor"); 110 } 111 112 public Message request(Destination destination, Message message, long timeout) throws JMSException { 113 throw new JMSException("request() not implemented for OneWayRequestor"); 114 } 115 116 protected void populateHeaders(Message message) throws JMSException { 117 } 118 119 protected void doSend(Destination destination, Message message, long timeToLive) throws JMSException { 120 if (destination == null) { 121 destination = serverDestination; 122 } 123 if (log.isDebugEnabled()) { 124 log.debug("Sending message to: " + destination + " message: " + message); 125 } 126 producer.getMessageProducer().send(destination, message, deliveryMode, priority, timeToLive); 127 } 128 129 /** 130 * Creates a new correlation ID. Note that because the correlationID is used 131 * on a per-temporary destination basis, it does not need to be unique across 132 * more than one destination. So a simple counter will suffice. 133 * 134 * @return 135 */ 136 public String createCorrelationID() { 137 return Long.toString(nextCounter()); 138 } 139 140 protected synchronized long nextCounter() { 141 return ++counter; 142 } 143 }