On Aug 12, 2014, at 10:55 PM, Pradeep Simha <[email protected]> wrote:
> My situation is like this, I have a server like this and inside I am calling
> another callback function which gets multiple values:
>
> var http = require('http');
> var server = http.createServer(req,resp) {
> var finalVal = "";
>
> consumer.on('message',function(message) {
> finalVal = message;
> console.log(finalVal);
> });
>
> resp.end(finalVal);
> });
>
Well, you can move the resp.end() inside the function(message) { } block. But
if consumer.on() can fire multiple times and you need to accumulate the
messages, how do you know when the data is complete? You will need to add a
check for that.
--ravi
> My finalVal should display all the multiple values it fetches and send it as
> a response, but problem is it's sending only first value where as console.log
> displays all the values. I do understand that by the time consumer.on ends
> response would have committed. Can someone please help me how to handle this
> scenario since I'm very new to Node.js ? Currently due to heavy deadlines I
> don't have time to read full information about callbacks. But defnitely I
> would take time to learn about callbacks.
>
> Here `consumer.on` calls multiple times till it fetches all the data from
> backend, I need to send all those data in a final response. I am using
> `node-kafka` to consume to kafka messages.
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