51 lines
963 B
Elixir
51 lines
963 B
Elixir
defmodule Todo.Database do
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use Supervisor
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@db_folder "./persist"
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@pool_size 3
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def start_link do
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Supervisor.start_link(__MODULE__, nil)
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end
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@impl Supervisor
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def init(_) do
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IO.puts("Starting #{__MODULE__}.")
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File.mkdir_p!(@db_folder)
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children = Enum.map(1..@pool_size, &worker_spec/1)
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Supervisor.init(children, strategy: :one_for_one)
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end
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defp worker_spec(worker_id) do
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default_worker_spec = {Todo.DatabaseWorker, {@db_folder, worker_id}}
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Supervisor.child_spec(default_worker_spec, id: worker_id)
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end
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def child_spec(_) do
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%{
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id: __MODULE__,
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start: {__MODULE__, :start_link, []},
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type: :supervisor
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}
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end
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def store(key, data) do
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key
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|> choose_worker()
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|> Todo.DatabaseWorker.store(key, data)
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end
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def get(key) do
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key
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|> choose_worker()
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|> Todo.DatabaseWorker.get(key)
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end
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defp choose_worker(key) do
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:erlang.phash2(key, @pool_size)
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end
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end
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