rocketmq-spring的consumer设置消费失败最大重试次数

分手后的思念是犯贱 2022-10-07 13:50 888阅读 0赞

# 说明 #

rocketmq-spring的consumer的相关属性配置有两种方式：

1.  在配置文件中进行配置
2.  类上使用@RocketMQMessageListener注解配置相关属性

关于注解中的属性可以查看：org.apache.rocketmq.spring.annotation.RocketMQMessageListener，而在文件中可以配置的属性只有如下几个（并不遵守spring boot自动配置规范，所以在idea中不会有相关提示）

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说明如下：

<table> 
 <thead> 
  <tr> 
   <th> <p>配置项</p> </th> 
   <th> <p>说明</p> </th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>rocketmq.name-server</td> 
   <td>rocketmq的name server地址，格式：`主机:端口;主机:端口`，多个地址以英文分号分隔</td> 
  </tr> 
  <tr> 
   <td>rocketmq.consumer.secret-key</td> 
   <td>&nbsp;ACL的secret-key属性</td> 
  </tr> 
  <tr> 
   <td>rocketmq.consumer.access-key</td> 
   <td>ACL的access-key属性</td> 
  </tr> 
  <tr> 
   <td colspan="1"> <pre><code>rocketmq.consumer.customized-trace-topic</code></pre> </td> 
   <td colspan="1">自定义消费轨迹topic，不使用忽略</td> 
  </tr> 
  <tr> 
   <td colspan="1"> <pre><code>rocketmq.access-channe</code></pre> </td> 
   <td colspan="1">枚举类型，值为：【LOCAL, CLOUD】，值为CLOUD表示设置接入阿里云。忽略。</td> 
  </tr> 
 </tbody> 
</table>

如果想要设置最大重试次数等一些相关初始化参数配置，很明显是不支持的。

同时，看一下构造consumer的源码，可以看到只配置了固定的几个属性：

private void initRocketMQPushConsumer() throws MQClientException {
    
            RPCHook rpcHook = RocketMQUtil.getRPCHookByAkSk(applicationContext.getEnvironment(),
                this.rocketMQMessageListener.accessKey(), this.rocketMQMessageListener.secretKey());
            boolean enableMsgTrace = rocketMQMessageListener.enableMsgTrace();
            if (Objects.nonNull(rpcHook)) {
                consumer = new DefaultMQPushConsumer(consumerGroup, rpcHook, new AllocateMessageQueueAveragely(),
                    enableMsgTrace, this.applicationContext.getEnvironment().
                    resolveRequiredPlaceholders(this.rocketMQMessageListener.customizedTraceTopic()));
                consumer.setVipChannelEnabled(false);
                consumer.setInstanceName(RocketMQUtil.getInstanceName(rpcHook, consumerGroup));
            } else {
                log.debug("Access-key or secret-key not configure in " + this + ".");
                consumer = new DefaultMQPushConsumer(consumerGroup, enableMsgTrace,
                    this.applicationContext.getEnvironment().
                        resolveRequiredPlaceholders(this.rocketMQMessageListener.customizedTraceTopic()));
            }
    
            String customizedNameServer = this.applicationContext.getEnvironment().resolveRequiredPlaceholders(this.rocketMQMessageListener.nameServer());
            if (customizedNameServer != null) {
                consumer.setNamesrvAddr(customizedNameServer);
            } else {
                consumer.setNamesrvAddr(nameServer);
            }
            if (accessChannel != null) {
                consumer.setAccessChannel(accessChannel);
            }
            consumer.setConsumeThreadMax(consumeThreadMax);
            if (consumeThreadMax < consumer.getConsumeThreadMin()) {
                consumer.setConsumeThreadMin(consumeThreadMax);
            }
            consumer.setConsumeTimeout(consumeTimeout);
    
            switch (messageModel) {
                case BROADCASTING:
                    consumer.setMessageModel(org.apache.rocketmq.common.protocol.heartbeat.MessageModel.BROADCASTING);
                    break;
                case CLUSTERING:
                    consumer.setMessageModel(org.apache.rocketmq.common.protocol.heartbeat.MessageModel.CLUSTERING);
                    break;
                default:
                    throw new IllegalArgumentException("Property 'messageModel' was wrong.");
            }
    
            switch (selectorType) {
                case TAG:
                    consumer.subscribe(topic, selectorExpression);
                    break;
                case SQL92:
                    consumer.subscribe(topic, MessageSelector.bySql(selectorExpression));
                    break;
                default:
                    throw new IllegalArgumentException("Property 'selectorType' was wrong.");
            }
    
            switch (consumeMode) {
                case ORDERLY:
                    consumer.setMessageListener(new DefaultMessageListenerOrderly());
                    break;
                case CONCURRENTLY:
                    consumer.setMessageListener(new DefaultMessageListenerConcurrently());
                    break;
                default:
                    throw new IllegalArgumentException("Property 'consumeMode' was wrong.");
            }
    
            if (rocketMQListener instanceof RocketMQPushConsumerLifecycleListener) {
                ((RocketMQPushConsumerLifecycleListener) rocketMQListener).prepareStart(consumer);
            } else if (rocketMQReplyListener instanceof RocketMQPushConsumerLifecycleListener) {
                ((RocketMQPushConsumerLifecycleListener) rocketMQReplyListener).prepareStart(consumer);
            }
    
        }

但是看代码的最后几行，rocketMQListener如果实现了RocketMQPushConsumerLifecycleListener接口，则会调用RocketMQPushConsumerLifecycleListener的prepareStart(consumer)方法，很明显，可以在这里设置consuemr的参数。

**说明：rocketMQListener就是类上带有RocketMQMessageListener的bean。**

# 解决方案 #

@RocketMQMessageListener(topic = "test_topic", consumerGroup = "test_topic_consumer", selectorExpression = "*")
        class StringConsumer implements RocketMQListener<String>, RocketMQPushConsumerLifecycleListener {
    
            @Override
            public void onMessage(String message) {
                LOGGER.info("receive message: {}", message);
            }
    
            @Override public void prepareStart(DefaultMQPushConsumer consumer) {
                // 设置最大重试次数
                consumer.setMaxReconsumeTimes(5);
                // 如下，设置其它consumer相关属性
                consumer.setPullBatchSize(16);
            }
        }

# 末语 #

我是在翻源码的才想到这个解决方案，我想既然提供有这个接口进行自定义配置，官方文档应该会有示例说明，然后翻了下github，是有类似的使用方式的，源码上还有其它示例，如果有其它问题，建议还是先看官方示例是否提供了相关解决方案。github地址：[https://github.com/apache/rocketmq-spring/tree/master/rocketmq-spring-boot-samples/rocketmq-consume-demo/src/main/java/org/apache/rocketmq/samples/springboot/consumer][https_github.com_apache_rocketmq-spring_tree_master_rocketmq-spring-boot-samples_rocketmq-consume-demo_src_main_java_org_apache_rocketmq_samples_springboot_consumer]

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[https_github.com_apache_rocketmq-spring_tree_master_rocketmq-spring-boot-samples_rocketmq-consume-demo_src_main_java_org_apache_rocketmq_samples_springboot_consumer]: https://github.com/apache/rocketmq-spring/tree/master/rocketmq-spring-boot-samples/rocketmq-consume-demo/src/main/java/org/apache/rocketmq/samples/springboot/consumer