sviolet.slate.common.helper.rocketmq.consumer

注释类型 RocketMqConcurrentConsumer

@Target(value=METHOD)
 @Retention(value=RUNTIME)
 @Documented
public @interface RocketMqConcurrentConsumer

RocketMQ 普通并发消费者

注意!!! 消费者必须保证幂等性! 任何一条消息都有可能被重复消费!

https://github.com/shepherdviolet/slate/blob/master/docs/rocketmq/guide.md

     @RocketMqConcurrentConsumer(
             consumerGroup = "consumer-a",
             topic = "test-topic",
             subExpression = "tag-a || tag-b || tag-c"
     )
     public boolean test(MessageExt message){
         logger.info("Received MessageExt: {}", message);
         return true;
     }
 

必需元素概要

所需元素

限定符和类型	必需的元素和说明
java.lang.String	consumerGroup 消费组名
java.lang.String	topic Topic

可选元素概要

可选元素

限定符和类型	可选元素和说明
java.lang.String	charset 字符集, 默认UTF-8
ConsumeWay	consumeFromWhere 选择消息从队列头还是队列尾开始消费
boolean	isBroadcast 是否以广播方式订阅
java.lang.String	nameServer 指定NameServer地址.
boolean	reconsumeWhenException true 抛出异常时重新消费消息(RECONSUME_LATER), 默认false
java.lang.String	sqlExpression 使用SQL92过滤消息.
java.lang.String	subExpression 订阅表达式, 例如: TagA || TagB || TagC, 默认全订阅.
int	threadMax 最大线程数, 这个参数目前无效, 请设置threadMin, 见https://github.com/apache/rocketmq-spring/issues/184
int	threadMin 最小线程数

元素详细资料

consumerGroup

public abstract java.lang.String consumerGroup

消费组名

topic

public abstract java.lang.String topic

Topic

subExpression

public abstract java.lang.String subExpression

订阅表达式, 例如: TagA || TagB || TagC, 默认全订阅. 注意: subExpression与sqlExpression二选一, 如果都配置了则sqlExpression生效.

默认值:

"*"

sqlExpression

public abstract java.lang.String sqlExpression

使用SQL92过滤消息. 需Broker配置支持. 例如: a between 0 and 3 参考: http://rocketmq.apache.org/docs/filter-by-sql92-example/ 注意: subExpression与sqlExpression二选一, 如果都配置了则sqlExpression生效.

默认值:

""

consumeFromWhere

public abstract ConsumeWay consumeFromWhere

选择消息从队列头还是队列尾开始消费

默认值:

sviolet.slate.common.helper.rocketmq.consumer.ConsumeWay.CONSUME_FROM_FIRST_OFFSET

isBroadcast

public abstract boolean isBroadcast

是否以广播方式订阅

默认值:

false

threadMin

public abstract int threadMin

最小线程数

默认值:

4

threadMax

public abstract int threadMax

最大线程数, 这个参数目前无效, 请设置threadMin, 见https://github.com/apache/rocketmq-spring/issues/184

默认值:

8

reconsumeWhenException

public abstract boolean reconsumeWhenException

true 抛出异常时重新消费消息(RECONSUME_LATER), 默认false

默认值:

false

charset

public abstract java.lang.String charset

字符集, 默认UTF-8

默认值:

""

nameServer

public abstract java.lang.String nameServer

指定NameServer地址. 优先级最高. 优先级: 1.@RocketMqConcurrentConsumer(nameServer = "...") / @RocketMqOrderedConsumer(nameServer = "...") 2.启动参数slate.common.rocketmq.namesrv 3.配置文件slate.common.rocketmq.namesrv 4.@EnableRocketMq(defaultNameServer = "...")

默认值:

""