Mastering Concurrency Programming with Java 9 - Second Edition

The CompletableFuture class

This is a synchronization mechanism introduced in the Java 8 concurrency API that has new methods in Java 9. It extends the Future mechanism, giving it more power and flexibility. It allows you to implement an event-driven model, linking tasks that will only be executed when others have finished. As with the Future interface, CompletableFuture must be parameterized with the type of the result that will be returned by the operation. As with a Future object, the CompletableFuture class represents a result of an asynchronous computation, but the result of CompletableFuture can be established by any thread. It has the complete() method to establish the result when the computation ends normally and the method completeExceptionally() ...