Basic Tutorials of Redis(7) -Publish and Subscribe
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This post is mainly about the publishment and subscription in Redis.I think you may subscribe?some offiial accounts on wechat,and when the authors published something new to their?accounts,you will get them in your wechat.The instance can make you understand this pattern?easily.You will find there only 6 commands for publishment and subscription.
? This post introduces the basic usages as well.I will show you how to publish a message to a?channel.publish is the command to publish sometings.I publish a channel named news-nba?with the message nba.And the client return me a integer 0.What is the meaning of the return?value?It means that there is nobody subscribe this channel. publish news-nba nba
? I open a new client for subscriber.In this client,I subscribe the above channel news-nba.It will?return something about this channel. subscribe news-nba
? OK,let's publish a new message to the news-nba to see the changes in the both clients.After?publishing lakers to the news-nba channel,this client returns 1.It means that the channel has a?subscriber. publish news-nba lakers
? Let's turn to the subscriber's client.You will find the message lakers was already in the client.So amazing it is.
Opening the second client to subscribe this channel,and you will find something similar with the above example.
? publish a new message to the news-nba,it returns 2 meaning ...(you understand it)
the both subscribers' client are as follows:
? All right,let's see the other commands of this feature in Redis.Seeing the sql first: ? channels channelname ?To execute this sql,you will get all of the channel whoes? name start with news.Redis can also?
psubscribe news-*
Let's publish some message to the others channel started with news- to find out the changes.
publish newstech tech
? The subscriber's client will receive the message from the channel news-tech.
? Again!!Publishing a message to a new channel.
? As you can see,the client receives this message as well. following code demonstrates the usage in C#.
sub =
sub2 =
sub.Publish(, sub.Publish(,
sub2.Subscribe(,(channel,value) =>
Console.WriteLine(.Format( sub2.Subscribe(,value) =>
Console.WriteLine(.Format(
sub.Publish(, sub.Publish(,
sub.Publish(,
System.Threading.Thread.Sleep( Console.WriteLine( sub2.Unsubscribe();
sub.Publish(,
System.Threading.Thread.Sleep( sub.Publish(,
System.Threading.Thread.Sleep( Console.WriteLine(
sub.Publish(, sub.Publish(,);
Debuging the code,you will see the result as follow.?
The next post of this series is the basic opreation of transaction in Redis.Thanks for your reading. （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
