Java Parallel Streams example for challenge 1 is not really non-blocking

[TexasFred]

Hello again,

I'm studying

https://github.com/ReactiveMeetupLucerne/AsyncNonBlockingExamplesJVM/blob/master/src/main/java/challenge1/java8/Java8StreamsExample.java

This doesn't look non-blocking... There is some concurrency... but the main thread is blocked until average() returns.

Is it possible at all to write non-blocking stuff using java 8 streams?

And why do you do I/O (call price service) using the common thread pool (parallelStream() uses that per default)? Isn't the common thread pool thought for CPU bound work? You are wasting threads of th common thread pool like this...

Hmmm... what do you think?

Best regards,
Fred

[TexasFred]

Using a custom thread pool for parallel streams looks ugly :-(

http://stackoverflow.com/questions/21163108/custom-thread-pool-in-java-8-parallel-stream

[TexasFred]

Here some more infos regarding the common pool... https://zeroturnaround.com/rebellabs/java-parallel-streams-are-bad-for-your-health/

I hope this helps!

[Petikoch]

@McPringle what do you think?