本文介绍了如何配置ActiveMQ的Redelivery Policy，以详细控制消息重试的方式。内容涉及ActiveMQConnectionFactory和ActiveMQConnection上的设置，以及通过Java代码、Spring或连接配置URI进行定制的方法。
Redelivery Policy
Detail on when messages are redelivered to a client can be found in the Message Redelivery and DLQ Handling section.
You can configure the RedeliveryPolicy on your ActiveMQConnectionFactory or ActiveMQConnection to customize exactly how you want the redelivery to work.
You can use Java code, Spring or the Connection Configuration URI to customise this.
Available Properties
| Property | Default Value | Description |
|---|---|---|
| collisionAvoidanceFactor | 0.15 | The percentage of range of collision avoidance if enabled |
| maximumRedeliveries | 6 | Sets the maximum number of times a message will be redelivered before it is considered a poisoned pill and returned to the broker so it can go to a Dead Letter Queue (use value -1 to define infinite number of redeliveries) |
| maximumRedeliveryDelay | -1 | Sets the maximum delivery delay that will be applied if the useExponentialBackOff option is set. (use value -1 to define that no maximum be applied) (v5.5) |
| initialRedeliveryDelay | 1000L | The initial redelivery delay in milliseconds |
| redeliveryDelay | 1000L | The delivery delay if initialRedeliveryDelay is 0 (v5.4) |
| useCollisionAvoidance | false | Should the redelivery policy use collision avoidance |
| useExponentialBackOff | false | Should exponential back-off be used (i.e. to exponentially increase the timeout) |
| backOffMultiplier | 5 | The back-off multiplier |
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