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Event store using PostgreSQL for persistence.
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Files
lib/event_store/config/store.ex
defmodule EventStore.Config.Store do
@moduledoc false
# Store and read runtime configuration associated with an event store.
use GenServer
def start_link(init_arg) do
GenServer.start_link(__MODULE__, init_arg, name: __MODULE__)
end
def associate(event_store, pid, config) when is_atom(event_store) and is_pid(pid) do
GenServer.call(__MODULE__, {:associate, event_store, pid, config})
end
@doc """
Get the configuration associated with the given event store.
"""
def get(event_store) when is_atom(event_store), do: lookup(event_store)
@doc """
Get the value of the config setting for the given event store.
"""
def get(event_store, setting) when is_atom(event_store) and is_atom(setting) do
event_store |> lookup() |> Keyword.get(setting)
end
@impl GenServer
def init(_init_arg) do
table = :ets.new(__MODULE__, [:named_table, read_concurrency: true])
{:ok, table}
end
@impl GenServer
def handle_call({:associate, event_store, pid, config}, _from, table) do
ref = Process.monitor(pid)
true = :ets.insert(table, {event_store, pid, ref, config})
{:reply, :ok, table}
end
@impl GenServer
def handle_info({:DOWN, ref, _type, pid, _reason}, table) do
[[event_store]] = :ets.match(table, {:"$1", pid, ref, :_})
:ets.delete(table, event_store)
{:noreply, table}
end
defp lookup(event_store) do
:ets.lookup_element(__MODULE__, event_store, 4)
rescue
ArgumentError ->
raise "could not lookup #{inspect(event_store)} because it was not started or it does not exist"
end
end