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Event store using PostgreSQL for persistence.
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lib/event_store/notifications/supervisor.ex
defmodule EventStore.Notifications.Supervisor do
@moduledoc false
# Supervises the individual `GenStage` stages used to listen to, read, and
# publish all events appended to storage.
use Supervisor
alias EventStore.{Config, MonitoredServer, Subscriptions}
alias EventStore.Notifications.{Listener, Publisher}
def child_spec({event_store, _config} = init_arg) do
%{id: Module.concat(event_store, __MODULE__), start: {__MODULE__, :start_link, [init_arg]}}
end
def start_link({_event_store, _config} = init_arg) do
Supervisor.start_link(__MODULE__, init_arg)
end
@impl Supervisor
def init({event_store, config}) do
conn = Keyword.fetch!(config, :conn)
schema = Keyword.fetch!(config, :schema)
serializer = Keyword.fetch!(config, :serializer)
query_timeout = Keyword.fetch!(config, :timeout)
listener_name = Module.concat([event_store, Listener])
publisher_name = Module.concat([event_store, Publisher])
postgrex_notifications_conn = postgrex_notifications_conn(event_store, config)
postgrex_notifications_config =
Config.postgrex_notifications_opts(config, postgrex_notifications_conn)
hibernate_after = Subscriptions.hibernate_after(event_store, config)
Supervisor.init(
[
Supervisor.child_spec(
{MonitoredServer,
mfa: {Postgrex.Notifications, :start_link, [postgrex_notifications_config]},
name: Module.concat([event_store, Postgrex, Notifications, MonitoredServer]),
backoff_min: 0},
id: Module.concat([postgrex_notifications_conn, MonitoredServer])
),
{Listener,
listen_to: postgrex_notifications_conn,
query_timeout: query_timeout,
schema: schema,
name: listener_name,
hibernate_after: hibernate_after},
{Publisher,
conn: conn,
query_timeout: query_timeout,
event_store: event_store,
schema: schema,
serializer: serializer,
subscribe_to: listener_name,
name: publisher_name,
hibernate_after: hibernate_after}
],
strategy: :one_for_all
)
end
defp postgrex_notifications_conn(name, config) do
case Keyword.get(config, :shared_connection_pool) do
nil ->
Module.concat([name, Postgrex, Notifications])
shared_connection_pool when is_atom(shared_connection_pool) ->
Module.concat([shared_connection_pool, Postgrex, Notifications])
invalid ->
raise ArgumentError,
"Invalid `:shared_connection_pool` specified, expected an atom but got: " <>
inspect(invalid)
end
end
end