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A composable, real time, market data and trade execution toolkit
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lib/tai/pub_sub.ex
defmodule Tai.PubSub do
def child_spec(opts) do
%{
id: __MODULE__,
start: {__MODULE__, :start_link, [opts]},
type: :supervisor,
restart: :permanent,
shutdown: 500
}
end
def start_link(_) do
Registry.start_link(
keys: :duplicate,
name: __MODULE__,
partitions: System.schedulers_online()
)
end
def subscribe([]), do: :ok
def subscribe([topic | tail]) do
Registry.register(__MODULE__, topic, [])
subscribe(tail)
end
def subscribe(topic) do
topic
|> List.wrap()
|> subscribe
end
def unsubscribe([]), do: :ok
def unsubscribe([topic | tail]) do
Registry.unregister(__MODULE__, topic)
unsubscribe(tail)
end
def unsubscribe(topic) do
topic
|> List.wrap()
|> unsubscribe
end
def broadcast(topic, message) do
Registry.dispatch(__MODULE__, topic, fn entries ->
for {pid, _} <- entries, do: send(pid, message)
end)
end
end