elixir-todo-list/lib/todo/cache.ex

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defmodule Todo.Cache do
use GenServer
@impl GenServer
def init(_init_args) do
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IO.puts("Starting #{__MODULE__}")
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{:ok, %{}}
end
@impl GenServer
def handle_call({:server_process, name}, _from, state) do
case Map.fetch(state, name) do
{:ok, process} ->
{:reply, process, state}
:error ->
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{:ok, new_process} = Todo.Server.start_link(name)
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new_state = Map.put(state, name, new_process)
{:reply, new_process, new_state}
end
end
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def start_link(_) do
GenServer.start_link(__MODULE__, nil, name: __MODULE__)
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end
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def server_process(name) do
GenServer.call(__MODULE__, {:server_process, name})
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end
end