Programming Concurrency on the JVM

From Sequential to Concurrent

We can’t run a single-threaded application on a multicore processor and expect better results. We have to divide it and run multiple tasks concurrently. But, programs don’t divide the same way and benefit from the same number of threads.

I have worked on scientific applications that are computation intensive and also on business applications that are IO intensive because they involve file, database, and web service calls. The nature of these two types of applications is different and so are the ways to make them concurrent.

We’ll work with two types of applications in this chapter. The first one is an IO-intensive application that will compute the net asset value for a wealthy user. The second one will compute ...