发布:2023/11/1 22:25:52作者:管理员 来源:本站 浏览次数:519
redis的发布(pub)是把消息推送到不同的频道或指定的频道,订阅(sub)是订阅一个或多个频道接收来自频道的消息,取消订阅(unsubscribe)。
概念性的就不多做介绍,看源码:
/*
* redis发布订阅
*/
"use strict";
let configFile = require('../../include/commons').CONFIG_FILE;
let config = require('../../resources/config/' + configFile);
let RedisModel = require('./../redis.model');
let RedisSubClient = require('./redisSubClient');
let RedisPubClient = require('./redisPubClient');
let redisPubConn = RedisPubClient.redisClient().connection;
let redisSubConn = RedisSubClient.redisClient().connection;
class PubSub{
constructor(){
this.sub=redisSubConn;
this.handlers=new Map();
this.subAction=(channle,message)=>{
console.log("接收消息:"+message);
message = JSON.parse(message);
//消息处理。。。
}
this.alredyPublishs=[];
this.subConnected=false;
}
publish(channel,message)
{
let action=()=>{
let pub=redisPubConn;
pub.publish(channel,message);
console.log("发布消息:channel:"+channel+",message:"+message);
};
if(this.subConnected===false)
{
this.alredyPublishs.push(action);
}
else{
action();
}
}
subscribe(channel)
{
let self=this;
this.sub.subscribe(channel,function (err,reply) {
if(err){
log.error(err);
}
self.subConnected=true;
for(let publish of self.alredyPublishs){
publish();
}
console.log("订阅成功:"+reply);
});
this.sub.on("message", function (channel, message) {
//接收消息
self.subAction(channel,message);
});
}
}
// Expose class
module.exports = new PubSub();
注意事项:
1、只要客户端订阅了频道, 发布订阅的指令其他均不能操作,否则会报错。我在实现时发现用了订阅的客户端也不能用来发布消息,会报错。
2、客户端可简单定义一个方法 var redisClient = redis.createClient(6379,"ip");
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