12.2 消息群组

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12.2 Message groups

12.2 消息群组

We can refine the exclusive consumer concept further with message groups. Instead

of all messages going to a single message consumer, messages can be grouped

together for a single consumer, and a message producer can designate a group for a

message by setting the message header JMSXGroupID. The ActiveMQ broker will

ensure that all messages with the same JMSXGroupID are sent to the same consumer, as

shown in figure 12.3.

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消息群组是排他性消息消费者概念的进一步完善.不同于将所有消息都发送到单一的消费者,消息可以被

分组,同一组消息会发送到同一个消费者,并且消息生产者通过设置消息头中的JMSXGroupID值给消息

分组.ActiveMQ代理确保JMSXGroupID值相同的消息会被发送到相同的消费者,如图12.3所示.

If the consumer designated by the ActiveMQ broker to receive messages for a given

JMSXGroupID should close or become unavailable (a network outage, for example),

then the ActiveMQ broker will select a different message consumer to dispatch the

grouped messages to.

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