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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 false
# Supervise zero, one or more subscriptions to an event stream.
use DynamicSupervisor
alias EventStore.Subscriptions
alias EventStore.Subscriptions.Subscription
def start_link(opts) do
DynamicSupervisor.start_link(__MODULE__, [], opts)
end
def start_subscription(opts) do
event_store = Keyword.fetch!(opts, :event_store)
stream_uuid = Keyword.fetch!(opts, :stream_uuid)
subscription_name = Keyword.fetch!(opts, :subscription_name)
supervisor = Module.concat(event_store, __MODULE__)
via_name = {:via, Registry, registry_name(event_store, stream_uuid, subscription_name)}
opts = Keyword.put(opts, :name, via_name)
DynamicSupervisor.start_child(supervisor, {Subscription, opts})
end
def unsubscribe_from_stream(event_store, stream_uuid, subscription_name) do
name = registry_name(event_store, stream_uuid, subscription_name)
case Registry.whereis_name(name) do
:undefined ->
:ok
subscription ->
Subscription.unsubscribe(subscription)
end
end
def stop_subscription(event_store, stream_uuid, subscription_name) do
name = registry_name(event_store, stream_uuid, subscription_name)
case Registry.whereis_name(name) do
:undefined ->
:ok
subscription ->
supervisor = Module.concat(event_store, __MODULE__)
DynamicSupervisor.terminate_child(supervisor, subscription)
end
end
@impl DynamicSupervisor
def init(_init_arg) do
DynamicSupervisor.init(strategy: :one_for_one)
end
defp registry_name(event_store, stream_uuid, subscription_name) do
registry = Module.concat([event_store, Subscriptions.Registry])
{registry, {stream_uuid, subscription_name}}
end
end