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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, MonitoredServer}
alias EventStore.Notifications.{
Listener,
PostgrexNotifications,
Reader,
StreamBroadcaster
}
@doc """
Starts a globally named supervisor process.
This is to ensure only a single instance of the supervisor, and its
supervised children, is kept running on a cluster of nodes.
"""
def start_link(config) do
case Supervisor.start_link(__MODULE__, config, name: {:global, __MODULE__}) do
{:ok, pid} ->
{:ok, pid}
{:error, {:already_started, pid}} ->
Process.link(pid)
{:ok, pid}
:ignore ->
:ignore
end
end
def init(config) do
postgrex_config = Config.sync_connect_postgrex_opts(config)
Supervisor.init(
[
Supervisor.child_spec(
{MonitoredServer,
[
{PostgrexNotifications, :start_link, [postgrex_config]},
[
after_restart: &Listener.reconnect/0,
after_exit: &Listener.disconnect/0,
name: Listener.Postgrex
]
]},
id: Listener.Postgrex
),
Supervisor.child_spec(
{MonitoredServer,
[
{Postgrex, :start_link, [postgrex_config]},
[name: Reader.Postgrex]
]},
id: Reader.Postgrex
),
{Listener, []},
{Reader, Config.serializer()},
{StreamBroadcaster, []}
],
strategy: :one_for_all
)
end
end