Lab 8 Level 1 / CompletableFuture in general

[nowknowing]

Description

How do we catch the IO exception expected from the first task run asynchronously?

Topic:

Asynchronous

Screenshots (if any):

Insert Images here if necessary

[gabrielloye]

I don't think you need to catch the IOException/InterruptedException? The test cases on CodeCrunch seem to pass without handling these 2

[tjoewel]

More generally, CompletableFuture is a functor and a monad (lecture 12 pg 17). What the sendAsync method does is return a HttpResponse wrapped in a CompletableFuture. If you look at the java API for HttpClient, you will see that send throws some exceptions of which IOException is one of them. However, SendAsync only throws IllegalArgumentException. All other exceptions would be handled in CompletableFuture similar to how the Sandbox in lecture 7 handles exceptions. If there is an IOException, it would be thrown when you do CompletableFuture.join(), so simply assigning a variable a HttpResponse wrapped in a CompletableFuture will not throw a IOException. Hope this helps!