Awesome
Elixir Publish/Subscribe
A Publish/Subscribe utility module that frees your business logic processes from the burden of communication.
Getting Started
Add :pubsub as a dependency to your mix.exs file:
defp deps do
[
{:pubsub, "~> 1.0"}
]
end
Then run mix deps.get in your shell to fetch the dependencies.
Examples
Assuming your client process looks like this:
defmodule Client do
def start(client_name) do
spawn(fn -> loop(client_name) end)
end
def loop(name) do
receive do
message ->
IO.puts "#{name} received `#{message}`"
loop(name)
end
end
end
With PubSub you can do this:
iex(1)> {topic1, topic2} = {:erlang, :elixir}
{:erlang, :elixir}
iex(2)> {:ok, pid} = PubSub.start_link()
{:ok, #PID<0.99.0>}
iex(3)> {pid1, pid2, pid3} =
...(3)> {
...(3)> Client.start("John"),
...(3)> Client.start("Nick"),
...(3)> Client.start("Tim")
...(3)> }
{#PID<0.106.0>, #PID<0.107.0>, #PID<0.108.0>}
iex(4)> PubSub.subscribe(pid1, topic1)
:ok
iex(5)> PubSub.subscribe(pid2, topic1)
:ok
iex(6)> PubSub.subscribe(pid3, topic2)
:ok
iex(7)> PubSub.publish(topic1, "#{topic1} is great!")
"Nick received `erlang is great!`"
"John received `erlang is great!`"
:ok
iex(8)> PubSub.publish(topic2, "#{topic2} is so cool, dude")
"Tim received `elixir is so cool, dude`"
:ok