刚开始着手学习在Spring中实现JMS确认功能。目前为止，我的消费者已经完美运行，唯一的问题是当我不确认消息时，它仍然从队列中被取走（我希望它保留在那里或者进入死信队列）。
在ConsumerClass中，我的简单消费者看起来像这样：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jms="http://www.springframework.org/schema/jms"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/jms http://www.springframework.org/schema/jms/spring-jms-3.0.xsd">
<!-- A JMS connection factory for ActiveMQ -->
<bean id="connectionFactory" class="org.apache.activemq.ActiveMQConnectionFactory"
p:brokerURL="failover://(tcp://jms1:61616,tcp://jms2:61616)?randomize=false&jms.redeliveryPolicy.maximumRedeliveries=5" />
<!-- A POJO that implements the JMS message listener -->
<bean id="simpleMessageListener" class="com.company.ConsumerClass" />
<!-- A JMS namespace aware Spring configuration for the message listener container -->
<jms:listener-container
container-type="default"
connection-factory="connectionFactory"
acknowledge="client"
concurrency="10-50"
cache="consumer">
<jms:listener destination="someQueue" ref="simpleMessageListener" method="onMessage" />
</jms:listener-container>
</beans>
在ConsumerClass中，我的简单消费者看起来像这样：
@Override public final void onMessage(Message message) {
Object postedMessage = null;
try {
postedMessage = ((ObjectMessage) message).getObject();
if (postedMessage.getClass() == SomeMessageType.class) {
try {
//Some logic here
message.acknowledge();
return; //Success Here
} catch (MyException e) {
logger.error("Could not process message, but as I didn't call acknowledge I expect it to end up in the dead message queue");
}
}
} catch (JMSException e) {
logger.error("Error occurred pulling Message from Queue", e);
}
//Also worth noting, if I throw new RuntimeException("Aww Noos"); here then it won't take it from the queue, but it won't get consumed (or end up as dead letter)...
}