If you really have to wait, consider setting a timeout with this overload of CompletableFuture.get and wait in a background thread to avoid blocking your entire application. Ideally, you should chain futures as much as you can (see below), be asynchronous “all the way”, and never wait, especially not in your main thread. I do it to illustrate the behaviour of CompletableFuture more conveniently, but this is something you should avoid as much as possible in your production code. This is the power of asynchronous computations.Ĭode examples in this article include calls to CompletableFuture.get which blocks the main thread and waits for the CompletableFuture to finish. Indeed, if you look again at the tree representing what we are computing here, you immediately realise that x+1 and y can be calculated in parallel, before they are added together to form the final result. the asynchronous version took 5 seconds.the synchronous version took 7 seconds, while.Let’s first consider the below computation, assuming each operation is expensive (and therefore takes a noticeable amount of time):Īnd compare classic, synchronous function calls with asynchronous promises: Example: multi-stages computations and futures’ synchronisation.Example: handle exception and propagate the exception.Example: handle exception and return a transformed future.Example: handle exception and return a default or error value.Example: when a future throws an exception.In this article, I will show, using various examples, how to best use CompletableFuture to leverage the full potential of promises.
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