I am using socket.io to send some data continuously from server to client. So I was using the setTimeout function to send the data periodically, and the sleep time is not constant so am not using setInterval, but setTimeout is not working. I am using service bus to get some data from my worker role which am forwarding to the client at regular intervals. Here is my code:
var sleepTime;
function requestQueue() {
sleepTime = 0;
console.log("REQUEST QUEUE STARTED");
console.log("SEND to WORKER ROLE");
// send the request to worker role
var broadcastMessage = {}
broadcastMessage.Channel = "World";
broadcastMessage.BufferSize = 10;
sendMessage(socketToWorkerRole, broadcastMessage)
receivePeriodicRecordsQueue(workerRoleToSocket);
}
////
function receivePeriodicRecordsQueue(queue) {
serviceBusService.receiveQueueMessage(queue, function (error, receivedMessage) {
if (!error) {
if (receivedMessage != null) {
var messageBody = receivedMessage.body;
if (messageBody != null) {
// Lots of processing and calculating sleep time
// SET TIMEOUT
if (sleepTime != 0) {
console.log("SLEEP TIME:" + sleepTime);
setTimeout(function () { requestQueue(); }, sleepTime);
}
// sending data to client through socket
io.sockets.emit('broadcast', recordsQueue);
}
}
}
}
else {
console.log(error);
}
})
}
I am basically a C# programmer, very new to JS. Please let me know if my implementation of setTimeout is wrong. Essentially I want the requestQueue method to be called periodically using a variable sleep time
EDIT ANSWER:
In my case it was a silly issue. I was using the sleep time in seconds instead of milliseconds. setTimeout requires milliseconds. I have marked Scott's as the answer because I thought the async module is pretty useful and can be used as a replacement for setTimeout and for a lot of other functionalities if needed.
It looks like you could benefit from some control flow in your app.
Take a look at the async module. It is straight forward and will eliminate the need to use setTimeout.