ParallelStream

Parallelized stream implementation for elixir

What does it do?

Parallelize some stream operations in Elixir whilst keeping your stream in order.
Operates with a worker pool.

How do I get it?

Add

elixirCopy
{:parallel_stream, "~> 1.1.0"}

to your deps in mix.exs like so:

elixirCopy
defp deps do
  [
    {:parallel_stream, "~> 1.1.0"}
  ]
end

Note: Elixir 1.5.0 is required

How to use

Do this to parallelize a map:

elixirCopy
stream = 1..10 |> ParallelStream.map(fn i -> i * 2 end)
stream |> Enum.into([])
[2,4,6,8,10,12,14,16,18,20]

The generated stream is sorted the same as the input stream.

More supported functions are each (to produce side-effects):

elixirCopy
1..100 |> ParallelStream.each(&IO.inspect/1)

filter:

elixirCopy
stream = 1..20 |> ParallelStream.filter(fn i -> i |> rem(2) == 0 end)
stream |> Enum.into([])
[2,4,6,8,10,12,14,16,18,20]

and filter's counterpart, reject:

elixirCopy
stream = 1..20 |> ParallelStream.reject(fn i -> i |> rem(2) == 0 end)
stream |> Enum.into([])
[1,3,5,7,9,11,13,15,17,19]

License

MIT

Contributions & Bugfixes are most welcome!