Define Cache and convert app to OTP
Define a simple in-memory key-value store for our cache. TL;DR: - Define `Cache` as a simple state-keeping `Agent` - Define `Sup`, which starts our Cache process - Define `App`, which starts our Supervisor process - Whitelist `App` in `mix.exs`, so that it starts after calling `iex -S mix`
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4 changed files with 58 additions and 1 deletions
8
assessments/semiprimes/server/lib/app.ex
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8
assessments/semiprimes/server/lib/app.ex
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defmodule App do
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use Application
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@impl true
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def start(_type, _args) do
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Sup.start_link()
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end
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end
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27
assessments/semiprimes/server/lib/cache.ex
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27
assessments/semiprimes/server/lib/cache.ex
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defmodule Cache do
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@moduledoc """
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Cache is an in-memory key-value store.
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"""
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use Agent
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@doc """
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Inititalize the key-value store.
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"""
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def start_link(_) do
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Agent.start_link(fn -> %{} end, name: __MODULE__)
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end
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@doc """
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Attempt to return the value stored at `key`
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"""
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def get(key) do
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Agent.get(__MODULE__, &Map.get(&1, key))
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end
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@doc """
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Write the `value` under the `key`. Last writer wins.
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"""
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def put(key, value) do
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Agent.update(__MODULE__, &Map.put(&1, key, value))
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end
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end
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21
assessments/semiprimes/server/lib/sup.ex
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assessments/semiprimes/server/lib/sup.ex
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defmodule Sup do
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@moduledoc """
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Top-level supervisor for our OTP application. For now, this supervisor starts
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and monitors our cache.
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"""
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use Supervisor
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def start_link(opts \\ []) do
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Supervisor.start_link(__MODULE__, :ok, opts)
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end
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@impl true
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def init(:ok) do
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children = [
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Cache
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]
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Supervisor.init(children, strategy: :one_for_one)
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end
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end
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@ -14,7 +14,8 @@ defmodule Server.MixProject do
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# Run "mix help compile.app" to learn about applications.
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def application do
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[
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extra_applications: [:logger]
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extra_applications: [:logger],
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mod: {App, []}
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]
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end
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