Created
May 2, 2018 07:27
-
-
Save enpedasi/25fef9cc6d366da37850b59fb4f53bd5 to your computer and use it in GitHub Desktop.
Elixir GenStage PartitionDispatcher Example
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
# | |
# GenStage PartitionDispatcher Example | |
# | |
# reference: http://www.elixirfbp.org/2016/08/genstage-example-no-3-dispatching.html | |
defmodule Comsumer do | |
use GenStage | |
def start_link(state) do | |
GenStage.start_link(__MODULE__, state) | |
end | |
def init(sleeping_time) do | |
{:consumer, sleeping_time} | |
end | |
def handle_events(events, _from, sleeping_time) do | |
IO.inspect(Comsumer: {self(), events |> Enum.map( &Integer.to_string/1 ), sleeping_time}) | |
Process.sleep(elem(sleeping_time,0)) | |
{:noreply, [], sleeping_time} | |
end | |
end | |
defmodule Splitter do | |
use GenStage | |
def start_link(_) do | |
GenStage.start_link(__MODULE__, :ok) | |
end | |
def init(:ok) do | |
hash_fun = fn event -> | |
{event, case rem(event, 3) do | |
0 -> :第一 | |
1 -> :第二 | |
2 -> :第三 | |
end | |
} end | |
{:producer_consumer, %{}, | |
dispatcher: {GenStage.PartitionDispatcher, | |
partitions: [:第一, :第二, :第三], | |
hash: hash_fun} | |
} | |
end | |
def handle_events(events, _from, state) do | |
# IO.inspect Splitter: state | |
{:noreply, events, state} | |
end | |
end | |
defmodule PartitionTest do | |
def run do | |
{:ok, import} = GenStage.from_enumerable(1..10) | |
{:ok, splitter} = Splitter.start_link([]) | |
{:ok, c_first} = Comsumer.start_link({2_000, :第一}) | |
{:ok, c_second} = Comsumer.start_link({2_000, :第二}) | |
{:ok, c_third} = Comsumer.start_link({2_000, :第三}) | |
GenStage.sync_subscribe(c_first, to: splitter, partition: :第一, max_demand: 1) | |
GenStage.sync_subscribe(c_second, to: splitter, partition: :第二, max_demand: 1) | |
GenStage.sync_subscribe(c_third, to: splitter, partition: :第三, max_demand: 1) | |
GenStage.sync_subscribe(splitter, to: import, max_demand: 1) | |
end | |
end |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment