CODEWITHSUNDEEP
multithreadingvert.x
KRR16
KRR16

Reputation: 187

How to handle simultaneous updates on a variable in Ver.tx?

I am new to Vert.x. I have one scenario in which I need to make a count for all incoming request into a verticle ‒ which is serving as a REST API.

If I just increment the counter for all request, then for simultaneous requests, the value won't be correct ‒ as it will be updating by all requests at same time. It will be same as multiple threads updating a variable simultaneously.

How to handle such scenario in Vert.x?

Upvotes: 0

Views: 52

Answers (1)

user4695271
user4695271

Reputation:

One solution would be to implement a verticle (and a handler) to do the counting/aggregation. Every time you receive a request, you would publish a message to that address (nothing really) and when the verticle receives it, do the math ‒ just add one. If you need the count value, you would need another handler for that. One thing to keep in mind is that you would need to instantiate only one of these ‒ if you have a cluster the problem complicates a little bit more.

But, why would you do any of that since Vert.x provides something out-of-the-box called Asynchronous counters. This locks though, but that would be one of the easiest ways to accomplish that task in a cluster.

Upvotes: 1

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