qqwy

vor 12 Monatendiscuss

We are happy to announce the open-source release of opsqueue, our opinionated queueing system. Opsqueue is a lightweight batch processing queue, optimized for high-throughput situations. It is very operationally simple and flexible to use, with a novel prioritization approach where decisions can be made in the middle of ongoing work.

qqwy

vor 6 Jahrendiscuss

They are not equivalent, as Erlang/Elixir uses structural typing whereas Haskell/ML uses nominal typing.

In Erlang you can define the following:

  equal(X, X) -> true;
  equal(_, _) -> false.

In Haskell, the following does not compile:

  equal x x = True
  equal _ _ = False

instead, we need to write something like

  equal x y | x == y    = True
            | otherwise = False

A subtle difference, but in some cases the structural semantics really do make patterns a lot cleaner (shorter without sacrificing readability). I think that this style of pattern-matching semantics is a consequence of Erlang's roots in Prolog, which works similarly (and not only checks for structural equivalence but even does unification when necessary).

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Opsqueue: Lightweight batch processing queue for heavy loads – now open-source

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