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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 and broadcast
# all events appended to storage.
#
# Erlang's global module is used to ensure only a single instance of this
# supervisor process, and its children including the PostgreSQL listener
# process, runs on a cluster of nodes. This minimises connections to the event
# store database. There will be at most one `LISTEN` connection per cluster.
use Supervisor
alias EventStore.Config
alias EventStore.MonitoredServer
alias EventStore.Notifications.{Listener, Reader, Broadcaster}
def start_link(arg) do
Supervisor.start_link(__MODULE__, arg)
end
@impl Supervisor
def init({event_store, registry, serializer, config}) do
postgrex_config = Config.sync_connect_postgrex_opts(config)
listener_name = Module.concat([event_store, Listener])
reader_name = Module.concat([event_store, Reader])
broadcaster_name = Module.concat([event_store, Broadcaster])
postgrex_listener_name = Module.concat([listener_name, Postgrex])
postgrex_reader_name = Module.concat([reader_name, Postgrex])
Supervisor.init(
[
Supervisor.child_spec(
{MonitoredServer,
mfa: {Postgrex.Notifications, :start_link, [postgrex_config]},
name: postgrex_listener_name},
id: Module.concat([postgrex_listener_name, MonitoredServer])
),
Supervisor.child_spec(
{MonitoredServer,
mfa: {Postgrex, :start_link, [postgrex_config]}, name: postgrex_reader_name},
id: Module.concat([postgrex_reader_name, MonitoredServer])
),
{Listener, listen_to: postgrex_listener_name, name: listener_name},
{Reader,
conn: postgrex_reader_name,
serializer: serializer,
subscribe_to: listener_name,
name: reader_name},
{Broadcaster,
event_store: event_store,
registry: registry,
subscribe_to: reader_name,
name: broadcaster_name}
],
strategy: :one_for_all
)
end
end