How do we get the first completed Async Activity?

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1

I couldn’t find an example online but it seems like when we call multiple async activities there is no elegant way of knowing which one has completed first.In a normal case I would use Java CompletionService which gives the first Future that completed. But in the case of Temporal I only see running a simply for loop and doing a synchronous wait on the promise.get()

2

You can use

Promise.anyOf(promiseList);

where promiseList is a List<Promise> which can contain your Async.function calls, for example:

promiseList.add(Async.function(myActivities::doSomething, inputA, inputB));
…

Hope this helps.

3

this returns the first completed ones right？

4

Yes - Promise - temporal-sdk 1.0.9 javadoc

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