ActiveMQ_037：死信队列的参数设置

环境：MAC OS X 10.11.5 + ActiveMQ 5.13.3

1.为每个 Queue 指定一个死信队列
<policyEntry queue=">">
  <deadLetterStrategy>
    <!--
      Use the prefix 'DLQ.' for the destination name, and make
      the DLQ a queue rather than a topic
    -->
    <individualDeadLetterStrategy
      queuePrefix="DLQ." useQueueForQueueMessages="true" />
  </deadLetterStrategy>
</policyEntry>

2. 自动丢弃超时消息
<policyEntry queue=">">
   <deadLetterStrategy>
     <sharedDeadLetterStrategy processExpired="false" />
   </deadLetterStrategy>
</policyEntry>

3.  如果希望非持久化消息超时后，也进入死信队列，需要增加如下设置
<policyEntry queue=">">
  <deadLetterStrategy>
    <sharedDeadLetterStrategy processNonPersistent="true" />
  </deadLetterStrategy>
</policyEntry>

参考文献：
1. http://activemq.apache.org/message-redelivery-and-dlq-handling.html