问题:

I'm working with an application that is written in Node.js and Express, and I'm trying to use the Stomp.js client to connect to an ActiveMQ server.

I can get the application to connect to ActiveMQ just fine using Stomp, but I am unable to get the system to automatically reconnect upon connection failure. It seems like the failure function is only called if the connection is initially successful and then later severed, though if ActiveMQ is already down when the Node app starts, I do see the error message that proves the failure function was called.

var Stomp = require('stompjs'); var stompClient = Stomp.overTCP('localhost', 61612); var stompStatus = false;  var stompSuccessCallback = function (frame) {     stompStatus = true;     console.log('STOMP: Connection successful'); };  var stompFailureCallback = function (error) {     stompStatus = false;     console.log('STOMP: ' + error);      setTimeout(stompConnect, 10000);     console.log('STOMP: Reconecting in 10 seconds'); };  function stompConnect() {     console.log('STOMP: Attempting connection');     stompClient.connect('login', 'password', stompSuccessCallback, stompFailureCallback);  }  stompConnect();

Does anybody have any idea what's going on here?

回答1:

The WebSocket that is held by the Stomp.client can only be opened once. If there is a network failure, reconnecting with the same StompClient will not work as the web socket will remain closed.

This can definitely be improved by stomp.js but in the mean time, you can workaround this by recreating a Stomp.client when a failure is detected. Something like:

var stompClient;  var stompFailureCallback = function (error) {     console.log('STOMP: ' + error);     setTimeout(stompConnect, 10000);     console.log('STOMP: Reconecting in 10 seconds'); };  function stompConnect() {     console.log('STOMP: Attempting connection');     // recreate the stompClient to use a new WebSocket     stompClient = Stomp.overTCP('localhost', 61612);     stompClient.connect('login', 'password', stompSuccessCallback, stompFailureCallback); }

回答2:

The original sompjs is no longer maintained. Please use https://github.com/stomp-js/stomp-websocket This version has support for automatic re-connection. On each successful connection, the connect callback is called where you can do your subscribes.

If you are using Angular 2, 4, or 5. You should look at https://github.com/stomp-js/ng2-stompjs This package not only support automatic re-connection, but it will also re-subscribe all queues and send any pending messages.

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