blob: cd064cc1ae4b7b0f79ef7ced5c67932ec76baf12 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
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
@doc """
List the contents of the cache. Useful for debugging purposes.
"""
def list() do
Agent.get(__MODULE__, & &1)
end
@doc """
Invalidate the entire cache.
"""
def clear() do
Agent.update(__MODULE__, fn _ -> %{} end)
end
end
|
