isabella232 / flow-5

Computational parallel flows on top of GenStage

Flow

Flow allows developers to express computations on collections, similar to the Enum and Stream modules, although computations will be executed in parallel using multiple GenStages.

Here is a quick example on how to count words in a document in parallel with Flow:

File.stream!("path/to/some/file")
|> Flow.from_enumerable()
|> Flow.flat_map(&String.split(&1, " "))
|> Flow.partition()
|> Flow.reduce(fn -> %{} end, fn word, acc ->
  Map.update(acc, word, 1, & &1 + 1)
end)
|> Enum.to_list()

See documentation for Flow or José Valim's keynote at ElixirConf 2016 introducing the main concepts behind GenStage and Flow.

Installation

Flow requires Elixir v1.3. Add :flow to your list of dependencies in mix.exs:

def deps do
  [{:flow, "~> 0.14"}]
end

License

See license for Elixir.