Return CompletableFuture or CompletableFuture<?>?
I want to write an asynchronous method that returns a CompletableFuture. The only purpose of the future is to track when the method is complete, not its result. Would it be bett
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Looking at the
CompletableFutureAPI you will find thatCompletableFutureis used with side effects kind of methods where the result can't be obtained (because it doesn't exist), ex:CompletableFuture.runAsync(Runnable runnable);returning a
CompletableFuturehere would be confusing because there no result really, we only care about the completion. Methods that takeConsumersandRunnablesreturnCompletableFuture, ex :thenAccept,thenAcceptAsync.ConsumerandRunnableare used for side effects in general.Another use case for
Voidis when you really don't know the result. For example:CompletableFuture.allOf, the passed list might be a CompletableFuture originated from a Runnable, so we can't get the result.Having said all of that,
CompletableFutureis only good if you don't have another option, if you can return the result then please go for it, the caller might choose to discard if they are not interested. You said that you are only interested in the completion, then yes,CompletableFuturewould do the job, but your API users would hate you if they know thatCompletableFuturewas an option and you just decided on their behalf that they will never need the result.
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