Tag Archives: polling

Polling VS Websockets – 1 Thing to consider

In a meeting today, A Co-Worker mentioned that Basecamp uses polling vs websockets because of stability. I mentioned that I might be converting one of my websockets to polling because it goes down sometimes.

Here is what I learned:

If your server fails for whatever reason the websocket will die and you will have to restart the connection. Now, this isn’t that bad as long as your program never crashes but if there is an intermittent db connection problem or some other unhandled error, the socket will fail and you will need a client side watcher to get it going again.

Polling works in this situation because what is down now may be up in 30 seconds and it will just keep polling even if the last one failed.

Here is a polling example:

 

self.poll = function() {
setTimeout(function() {
$.ajax({
url: "MY_URL",
success: function(data) {
self.alerts = data;
},
dataType: "json",
complete: function (){ self.poll(); }
});
}, 15000);
}

BTW: Using an angular service vs writing this code in multiple controllers made the conversion take less than 5 minutes.

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