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rabbitmq

Install

Config

Concept

  • Topics

Topic 实现 publish 和 subscribe .

publish => message => subscribers. 每个 active subscriber 都接收到一份 copy。

In JMS a Topic implements publish and subscribe semantics. When you publish a message it goes to all the subscribers who are interested - so zero to many subscribers will receive a copy of the message. Only subscribers who had an active subscription at the time the broker receives the message will get a copy of the message.

  • Queues

Queue 实现 load balance . Queues implement a reliable load balancer

message => Queue => consumer.

如果没有consumer， 信息会keep在queue中，直到有avaiable consumer。 如果consumer 接收 message，但是没有acknowledge it， 便意外closing。 信息会 redelivered 给令一个consumer。

A queue can have many consumers with messages load balanced across the available consumers.

Hits

  • 持久化: Durable
  • 事务: txSelect/txCommit/txRollback
  • Confirm
  • acknowledgment
  • 消息未完全持久化，当机器重启后，消息会全部丢失，甚至Queue也不见了

Snippts