Redis 發(fā)布訂閱

redis作為一個pub/sub server，在訂閱者和發(fā)布者之間起到了消息路由的功能。訂閱者可以通過subscribe和psubscribe命令向redis server訂閱自己感興趣的消息類型，redis將消息類型稱為頻道(channel)。當(dāng)發(fā)布者通過publish命令向redis server發(fā)送特定類型的消息時。訂閱該消息類型的全部client都會收到此消息。這里消息的傳遞是多對多的。一個client可以訂閱多個 channel,也可以向多個channel發(fā)送消息。

終端A：
127.0.0.1:6379> subscribe comments
Reading messages... (press Ctrl-C to quit)
1) "subscribe"
2) "comments"
3) (integer) 1
終端B:
127.0.0.1:6379> subscribe comments
Reading messages... (press Ctrl-C to quit)
1) "subscribe"
2) "comments"
3) (integer) 1
終端C：
127.0.0.1:6379> publish comments good!
(integer) 2
終端A:
127.0.0.1:6379> subscribe comments
Reading messages... (press Ctrl-C to quit)
1) "subscribe"
2) "comments"
3) (integer) 1
1) "message"
2) "comments"
3) "good!"
終端B：
127.0.0.1:6379> subscribe comments
Reading messages... (press Ctrl-C to quit)
1) "subscribe"
2) "comments"
3) (integer) 1
1) "message"
2) "comments"
3) "good!"

可以使用psubscribe通過通配符進(jìn)行多個channel的訂閱