C # Redis
- Publish subscription model
- Publish subscriptions in Redis
- Client Programming examples
- 0.3 version Hredis
Publish subscription model
At the application level its role is to reduce dependencies, often also called observer patterns. The main point is to separate the coupling points out as a third party, isolating the easily changing sender and receiver.
Sender: Only responsible for sending messages to third parties. (the magazine gives the reader magazine to the Post Office)
Receiver: passively receives the message. (1: Subscribe to the Post Office Reader magazine, 2: The door to the magazine to receive mail)
Third-party functions: Store subscribers to the magazine and send it to the receiver when the magazine comes in. Post Office
C # example, the sender puts the magazine inside the Post office:
if (QA. Addbug ()) emailnotify ();
Emailnotify + = () = {Console.WriteLine ("a June");}; Emailnotify + = () = {Console.WriteLine ("b June");};
The third-party post office receives the reader magazine subscription and dispatches it when it receives the magazine:
public delegate void MessageHandler (); public static event MessageHandler emailnotify; if (QA. Addbug ()) emailnotify ();
When we zoom in on the observer pattern to the system level, it is the Publish subscription (Pub/sub). It is mainly used to reduce the coupling between publishers and subscribers and improve the throughput of the front-end system. Structure
Publish subscriptions in Redis
Redis implements a full publish-subscribe paradigm, which means that any Redis server can be used as a publishing subscriber after startup.
General Subscription
Start subscriber Client.
Redis-cli.exe-h 127.0.0.1-p 6379
Subscribe to the Bar channel. Format: SUBSCRIBE name1 name2.
A successful subscription response, corresponding to the subscription type, subscription channel, number of subscriptions.
127.0.0.1:6379> SUBSCRIBE barreading Messages ... (Press Ctrl-c to quit) 1) "Subscribe" 2) "Bar" 3) (integer) 1
A new publisher client, sending a message. Format: Publish ChannelName Message.
127.0.0.1:6379> Publish bar val (integer) 1
Subscribe to the client reply, corresponding to the message type, channel, message.
1) "Message" 2) "bar" 3) "Val"
Legend
Mode subscription
Redis supports pattern matching subscriptions, * for fuzzy matches.
Subscribe to all channel messages
Psubscribe *
Subscribe to all channels that start with news.
Psubscribe news.*
Cancel Subscription
The command to cancel the normal and cancel mode subscriptions.
Unsubscribe barpunsubscribe ba*
Cancellation cannot be simulated in the official connection tool.
View subscription information
Viewing subscription messages is one of the commands that Redis adds to the 2.8 center.
PubSub channels [pattern].
Returns all the channels that the current server is subscribed to.
127.0.0.1:6379> pubsub channels1) "Bar"
Specify the matching parameters to return all channels that match the pattern.
127.0.0.1:6379> pubsub channels ba*1) "Bar"
PubSub numsub [channel-1 channel-2 ... channel-n]
Accept as many channels as input parameters to return the number of subscribers to these channels.
127.0.0.1:6379> pubsub numsub bar bar21) "Bar" 2) (integer) "Bar2" 4) (integer) 0
Client Programming examples
Redispubsub client = new Redispubsub ("127.0.0.1", 6381); Client. Onunsubscribe + = (obj) = { Console.WriteLine (); }; Client. OnMessage = (sender, Arcgs) =>{ Console.WriteLine (ARCGS); }; Client. OnError = (Exception) = { Console.WriteLine (exception.message); }; Client. Subscribe ("Bar"); Console.ReadLine ();
0.3 version Hredis Basic use
using (redisclient client = new Redisclient ("127.0.0.1", 6381)) { client. Set ("Key", "value"); Client. Get ("key"); }
Use connection pooling to automatically reclaim connections.
Poolredisclient PRC = new Poolredisclient (new Poolconfiguration ()); Prc. Single.set ("Key", "value"); Prc. Single.get ("key");
and the above subscription.
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Open Source Address Https://github.com/mushroomsir/HRedis
C # Redis
