Redis 設計與實現 (六)--釋出訂閱

K戰神發表於2018-03-05

釋出訂閱

相關命令:publish(釋出)  subscribe(訂閱)  psubscribe(支援萬用字元匹配)

釋出者--頻道--訂閱者(釋出和訂閱都是客戶端頻道是服務端)

1、publish- subscribe 模式

開啟一個命令窗體,redis訂閱者:

# redis-cli
127.0.0.1:6379> subscribe channel_1
Reading messages... (press Ctrl-C to quit)
1) "subscribe"
2) "channel_1"
3) (integer) 1

然後再開啟一個命令窗體為redis 釋出者:

# redis-cli
127.0.0.1:6379> publish channel_1 "hello"
(integer) 2
127.0.0.1:6379> publish channel_1 "world"
(integer) 2

然後再看看訂閱者的反饋:

127.0.0.1:6379> subscribe channel_1
Reading messages... (press Ctrl-C to quit)
1) "subscribe"
2) "channel_1"
3) (integer) 1
1) "message"//訂閱訊息
2) "channel_1"//頻道
3) "hello"//訊息體
1) "message"//訊息
2) "channel_1"//訂閱頻道
3) "world"//訊息

收到 channle_1=>hello 和 channel_1=>world,釋出者廣播的訊息。

 

2、publish-psubscribe 模式

首先,定義訂閱者訂閱

# redis-cli
127.0.0.1:6379> psubscribe server-*
Reading messages... (press Ctrl-C to quit)
1) "psubscribe"
2) "server-*"
3) (integer) 1

 

其次,定義釋出者server-1

# redis-cli
127.0.0.1:6379> publish server-1 "server-1"

 

再次,定義釋出者server-2

# redis-cli
127.0.0.1:6379> publish server-2 "server_2"

 

最後,檢視訂閱者訂閱變化

# redis-cli
127.0.0.1:6379> psubscribe server-*
Reading messages... (press Ctrl-C to quit)
1) "psubscribe"
2) "server-*"
3) (integer) 1
1) "pmessage"
2) "server-*"
3) "server-1"//server-1
4) "server-1"
1) "pmessage"
2) "server-*"
3) "server-2"//server-2
4) "server_2"

 

3、退訂

unsubscribe <頻道s>  

punsubscribe <頻道s>

4、檢視訂閱資訊 PUBSUB CHANNELS

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