Question

我正在尝试实现pub / sub，如下所示

publisher.js

var zmq = require('zmq');
var pub = zmq.socket('pub');

pub.bindSync('tcp://127.0.0.1:5555');

pub.send('pub msg');
/*
setInterval(function(){
    console.log("sending message")

},500);*/

subscriber.js

var zmq = require('zmq');
var sub = zmq.socket('sub');
sub.connect('tcp://127.0.0.1:5555');

sub.subscribe('');  //herein lies the question

sub.on('message',function(msg){
    console.log('Received msg:',msg);
})

只有当pub.send('pub msg');在setInterval内部且不确定我的理解时，上述订阅者才会收到该消息

我不想使用setInterval而是我必须在收到消息后立即发送消息

请说我怎么能用pub / sub做这件事我想有一些基本的理解缺失请帮助

在nodejs代码中我尝试使用路径

 router.post('/putMsgIn0MQ', function (req, res, next) {
     pushData(JSON.stringify(req.body))
 })

var pushData = function(dataToPush) {
    var zmqSocket = zmq.socket('pub')
        var zmqPortPart = 'tcp://127.0.0.1:5555'
        zmqSocket.bind(zmqPortPart);
        zmqSocket.send(dataToPush);

}

订户

var sub = zmq.socket('sub');
                sub.connect('tcp://127.0.0.1:5555');
                sub.subscribe('');  //herein lies the question
                console.log('Received msg:');
                sub.on('message',function(msg){
                        console.log('Received msg:');
                        console.log(msg.toString())
                        var jsonPayload = msg.toString();
                        processData(jsonPayload, zmqPortObj.name);
                })

Answer 1

基于此代码，来自他们的文档：

// pubber.js 
var zmq = require('zmq')
   , sock = zmq.socket('pub');

  sock.bindSync('tcp://127.0.0.1:3000');
 console.log('Publisher bound to port 3000');

setInterval(function(){
  console.log('sending a multipart message envelope');
  sock.send(['kitty cats', 'meow!']);
}, 500);

似乎setInterval只是效用函数：）

什么阻止您手动触发？

例如，假想的控制器：

exports.animals= {
   getCat: function (request, response) {

   var animal = request.payload.catStuff;

   //process the animal object
  //and manually fire the message like:


sock.send(['kitty cats', 'meow!']);

...

nodejs中的发布者订阅模式没有使用setinterval

1 个答案: