score:2

Accepted answer

Akka should be able to support that - http://akka.io/ .
You can also check out kestrel - https://github.com/robey/kestrel

score:0

You can also try simple java PubSub system based on Redis with Redisson lib

score:0

You should definitely take a look at Akka Streams. They support bounded buffers in the most elegant way, using the backpressure.


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