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eventstore
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Event store using PostgreSQL for persistence.
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Files
lib/event_store/subscriptions/supervisor.ex
defmodule EventStore.Subscriptions.Supervisor do
@moduledoc """
Supervise zero, one or more subscriptions to an event stream.
"""
use Supervisor
alias EventStore.Subscriptions.Subscription
def start_link(_) do
Supervisor.start_link(__MODULE__, nil, name: __MODULE__)
end
def subscribe_to_stream(stream_uuid, subscription_name, subscriber, subscription_opts) do
name = {:via, Registry, registry_name(stream_uuid, subscription_name)}
Supervisor.start_child(__MODULE__, [stream_uuid, subscription_name, subscriber, subscription_opts, [name: name]])
end
def unsubscribe_from_stream(stream_uuid, subscription_name) do
name = registry_name(stream_uuid, subscription_name)
case Registry.whereis_name(name) do
:undefined -> :ok
subscription ->
:ok = Subscription.unsubscribe(subscription)
:ok = Supervisor.terminate_child(__MODULE__, subscription)
end
end
def init(_) do
children = [
worker(Subscription, [], restart: :temporary),
]
supervise(children, strategy: :simple_one_for_one)
end
defp registry_name(stream_uuid, subscription_name) do
{Subscription, {stream_uuid, subscription_name}}
end
end