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SQS Asynchronous implementation with a Synchronous wait  RSS feed

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I've just made an implementation using queues and I need to get some feedback to see if the solution I've taken is reliable...

I created a sqs implementation to replace a rest call, in this way, i won't loose any rest request, so, i insert requests in a queue, all that happens next is totally asynchronous, so the application send a message to a queue and imediately needs to wait a response which is inserted in another queue, but i need that wait to be synchronous, as the user need to wait an answer...

So to achieve that, after the app send the request message to the queue, it gets into a while true which continuosly reads the response queue, the wait is for 30 secs max, now it works, but i need to know what do you guys think of this approach.
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