Task-like thing

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Dimitar Georgiev

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Oct 1, 2017, 10:25:09 AM10/1/17

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Hello,

I'm looking for something roughly with the semantics of scalaz Task.

- It should be lazy, meaning construction of the thing should not lead to its evaluation / submission to a thread pool

- It should be able to handle errors, meaning I can map and bind over the thing, and if upstream has failed, I get the failed thing.

I tried looking at Promise, but either it doesn't cut it or I'm using it wrong. Also I browsed around the archives but couldn't find anything.

For completeness, my usecase here is to interpret DB<A> in a target structure F which evaluates asynchronously, and lazily, so that methods transforming and composing F's are just descriptions of computation and therefore pure. This, of course, breaks with CompletableFuture, ListenableFuture and friends.