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defmodule Cache do
@moduledoc """
Cache is an in-memory key-value store.
"""
use Agent
@doc """
Inititalize the key-value store.
"""
def start_link(_) do
Agent.start_link(fn -> %{} end, name: __MODULE__)
end
@doc """
Attempt to return the value stored at `key`
"""
def get(key) do
Agent.get(__MODULE__, &Map.get(&1, key))
end
@doc """
Write the `value` under the `key`. Last writer wins.
"""
def put(key, value) do
Agent.update(__MODULE__, &Map.put(&1, key, value))
end
end
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