Use Scala concurrency to improve performance

[cdupuis]

How many threads is this creating? What happens if two archives get unpacked at the same time?

I think what this boils down to: What is the behaviour in a concurrent environment when calling Await.result(). What is the underlying thread pool?

[alankstewart]

According to the Scala docs (http://docs.scala-lang.org/overviews/core/futures.html),

the ExecutionContext.global sets the parallelism level of its underlying fork-join pool to the amount of available processors.

I experimented with varying thread pool sizes but using the default seemed to give the best performance over multiple runs. I am still writing more tests and tweaking the code. I've set up a test which unpacks 3 archives at the same time. No issues

[ddgenome]

Why was the timeout decreased to 15 s? Have you tested with archives having lots of files and large size?

[alankstewart]

There was concern by Christian that four seconds was too long for an archive