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defmodule Ejabberd.Config.Store do
@moduledoc """
Module used for storing the modules parsed from
the configuration file.
Example:
- Store.put(:modules, mod1)
- Store.put(:modules, mod2)
- Store.get(:modules) :: [mod1, mod2]
Be carefoul: when retrieving data you get them
in the order inserted into the store, which normally
is the reversed order of how the modules are specified
inside the configuration file. To resolve this just use
a Enum.reverse/1.
"""
@name __MODULE__
def start_link do
Agent.start_link(fn -> %{} end, name: @name)
end
@doc """
Stores a value based on the key. If the key already exists,
then it inserts the new element, maintaining all the others.
It uses a list for this.
"""
@spec put(atom, any) :: :ok
def put(key, val) do
Agent.update @name, &Map.update(&1, key, [val], fn coll ->
[val | coll]
end)
end
@doc """
Gets a value based on the key passed.
Returns always a list.
"""
@spec get(atom) :: [any]
def get(key) do
Agent.get @name, &Map.get(&1, key, [])
end
@doc """
Stops the store.
It uses Agent.stop underneath, so be aware that exit
could be called.
"""
@spec stop() :: :ok
def stop do
Agent.stop @name
end
end
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