在我们当前的应用程序中使用JBOSS EAP 6.2,我们有许多批处理作业是由远程EJB调用触发的。为了集中这些作业的所有通知逻辑,我们决定通过传递序列化消息来通过MDB路由所有呼叫。预期流量如下:
- 批处理工作客户端将消息发送到远程队列
- MDB在此远程队列,过程消息上听和调用EJB
- DLQ在所有重试时都配置为处理通知精疲力尽
- 也应在每个重试时发送通知。避免太多通知,重试间隔足够高
要处理最后一点,我尝试通过在 jmsreplyto 标题中设置 wreate a wreate a 。为了模拟上述流,我创建了以下MDB实现...
主MDB:
@MessageDriven(name = "MiddleManMDB", activationConfig = {
@ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Queue"),
@ActivationConfigProperty(propertyName = "destination", propertyValue = "queue/test"),
@ActivationConfigProperty(propertyName = "connectorClassName", propertyValue = "org.hornetq.core.remoting.impl.netty.NettyConnectorFactory"),
@ActivationConfigProperty(propertyName = "connectionParameters", propertyValue = "host=localhost;port=5445"),
@ActivationConfigProperty(propertyName = "user", propertyValue = "queueuser"),
@ActivationConfigProperty(propertyName = "password", propertyValue = "queuepassword")
})
public class MiddleManMDB implements MessageListener {
private static final Logger LOGGER = LoggerFactory.getLogger(MiddleManMDB.class);
@Resource(name = "java:/JmsXA")
private ConnectionFactory connectionFactory;
/*
* (non-Javadoc)
* @see javax.jms.MessageListener#onMessage(javax.jms.Message)
*/
@Override
public void onMessage(Message message)
{
try {
if (message instanceof TextMessage) {
LOGGER.info("Received text message --> {}", ((TextMessage)message).getText());
}
throw new JMSException("thrown exception");
}
catch (Exception e) {
sendToReplyQueue(e.getMessage(), message);
LOGGER.info("Throwing exception to simulate retry...");
throw new RuntimeException(e);
}
}
private void sendToReplyQueue(String errorMessage, Message message)
{
Context context = null;
Connection conn = null;
LOGGER.info("Sending exception details to reply queue...");
try {
context = new InitialContext();
conn = connectionFactory.createConnection();
Session session = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
Destination jmsReplyTo = message.getJMSReplyTo();
MessageProducer replyProducer = session.createProducer(jmsReplyTo);
replyProducer.send(jmsReplyTo, session.createTextMessage(errorMessage));
}
catch (NamingException | JMSException e) {
e.printStackTrace();
}
finally {
// close connection and context
}
}
}
回复MDB:
@MessageDriven(name = "ReplyMDB", activationConfig = {
@ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Queue"),
@ActivationConfigProperty(propertyName = "destination", propertyValue = "queue/reply")
})
public class ReplyMDB implements MessageListener {
private static final Logger LOGGER = LoggerFactory.getLogger(ReplyMDB.class);
@Override
public void onMessage(Message message) {
try {
if (message instanceof TextMessage) {
LOGGER.info("Received reply message --> " + ((TextMessage)message).getText());
}
}
catch (JMSException e) {
LOGGER.error("Error in reply queue...", e);
}
}
}
**死信MDB:**
@MessageDriven(name = "DeadLetterMDB", activationConfig = {
@ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Queue"),
@ActivationConfigProperty(propertyName = "destination", propertyValue = "queue/dead")
})
public class DeadLetterMDB implements MessageListener {
private static final Logger LOGGER = LoggerFactory.getLogger(DeadLetterMDB.class);
@Override
public void onMessage(Message message) {
try {
LOGGER.info("Message has arrived in dead letter queue");
LOGGER.info("Current delivery count - {}", message.getIntProperty("JMSXDeliveryCount"));
if (message instanceof TextMessage) {
LOGGER.info("Received text message --> {}", ((TextMessage)message).getText());
}
}
catch (JMSException e) {
e.printStackTrace();
}
}
}
**客户端:**
public static void main(String[] args) {
Connection connection = null;
Context context = null;
try {
// create context and connection factory
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
Destination destination = (Destination) context.lookup("jms/queue/test");
Destination replyDest = (Destination) context.lookup("jms/queue/reply");
MessageProducer producer = session.createProducer(destination);
connection.start();
TextMessage message = session.createTextMessage("Hello World");
message.setJMSReplyTo(replyDest);
producer.send(message);
}
catch (NamingException | JMSException e) {
e.printStackTrace();
}
finally {
// close context and connection
}
}
**独立条目 - full.xml:**
<address-settings>
<address-setting match="jms.queue.testQueue">
<dead-letter-address>jms.queue.DLQ</dead-letter-address>
<expiry-address>jms.queue.ExpiryQueue</expiry-address>
<redelivery-delay>1000</redelivery-delay>
<max-delivery-attempts>3</max-delivery-attempts>
<max-size-bytes>10485760</max-size-bytes>
<address-full-policy>BLOCK</address-full-policy>
<message-counter-history-day-limit>10</message-counter-history-day-limit>
</address-setting>
<address-setting match="jms.queue.replyQueue">
<redelivery-delay>1000</redelivery-delay>
<max-delivery-attempts>3</max-delivery-attempts>
<max-size-bytes>10485760</max-size-bytes>
<address-full-policy>BLOCK</address-full-policy>
<message-counter-history-day-limit>10</message-counter-history-day-limit>
</address-setting>
<address-setting match="jms.queue.DLQ">
<redelivery-delay>1000</redelivery-delay>
<max-delivery-attempts>3</max-delivery-attempts>
<max-size-bytes>10485760</max-size-bytes>
<address-full-policy>BLOCK</address-full-policy>
<message-counter-history-day-limit>10</message-counter-history-day-limit>
</address-setting>
</address-settings>
<jms-destinations>
<jms-queue name="testQueue">
<entry name="queue/test"/>
<entry name="java:jboss/exported/jms/queue/test"/>
</jms-queue>
<jms-queue name="replyQueue">
<entry name="queue/reply"/>
<entry name="java:jboss/exported/jms/queue/reply"/>
</jms-queue>
<jms-queue name="DLQ">
<entry name="queue/dead"/>
<entry name="java:jboss/exported/jms/queue/dead"/>
</jms-queue>
<jms-topic name="testTopic">
<entry name="topic/test"/>
<entry name="java:jboss/exported/jms/topic/test"/>
</jms-topic>
</jms-destinations>
现在,随着MDB中的上述流动,该消息在回复队列中从未收到。所有三个队列都部署在同一服务器上。
我猜想的原因是以下行:
sendToReplyQueue(e.getMessage(), message);
LOGGER.info("Throwing exception to simulate retry...");
throw new RuntimeException(e);
由于发送是异步的,我正在扔一个RTE(触发重试(,因此消息从未发送。有没有办法解决此问题?
我猜想原因是下行......
您可以尝试评论RTE。还要添加更多记录仪以跟踪。检查是否正确设置了回复目的地设置。
message.setJMSReplyTo(replydestination); LOGGER.info("Reply to: " + message.getJMSReplyTo());
或发送到重播队列的消息
replyProducer.send(jmsReplyTo, session.createTextMessage(errorMessage)); LOGGER.info("exception details sent to reply queue...");