Mastering Functional Programming

Blocking example

First, let's take a look at the API behind creating an asynchronous IO action:

So, you can supply an arbitrary task into an apply method of IO, and this will construct the description of this task.

We can model blocking of a computation by using the Thread.sleep Java API under the IO apply method as follows:

IO { Thread.sleep(1000) }

Notice that the preceding example will block its thread. IO may be just a description of a computation. However, the computations are supposed to get executed at some point. In the JVM world, any computation runs on a thread. In the preceding example, we are using the Java Thread.sleep API to ...