Suppose I have several futures and need to wait until either any of them fails or all of them succeed.

For example: Let there are 3 futures: f1, f2, f3.

  • If f1 succeeds and f2 fails I do not wait for f3 (and return failure to the client).

  • If f2 fails while f1 and f3 are still running I do not wait for them (and return failure)

  • If f1 succeeds and then f2 succeeds I continue waiting for f3.

How would you implement it?

scala concurrency future
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