Packages
eventstore
0.13.0
1.4.8
1.4.7
1.4.6
1.4.4
1.4.3
1.4.2
1.4.1
1.4.0
1.3.2
1.3.1
1.3.0
1.2.3
1.2.2
1.2.1
1.2.0
1.1.0
1.0.3
1.0.2
1.0.1
1.0.0
1.0.0-rc.0
0.17.0
0.16.2
0.16.1
0.16.0
0.15.1
0.15.0
0.14.0
0.14.0-rc.0
0.13.2
0.13.1
0.13.0
0.12.1
0.12.0
0.11.0
0.11.0-rc.0
0.10.1
0.10.0
0.9.0
0.8.1
0.8.0
0.7.4
0.7.3
0.7.2
0.7.1
0.7.0
0.6.2
0.6.1
0.6.0
0.5.2
0.5.1
0.5.0
0.4.3
0.4.2
0.4.1
0.4.0
0.3.0
0.2.1
0.2.0
0.1.0
0.0.5
0.0.4
0.0.3
0.0.2
0.0.1
Event store using PostgreSQL for persistence.
Current section
Files
Jump to
Current section
Files
lib/event_store/subscriptions.ex
defmodule EventStore.Subscriptions do
@moduledoc """
Pub/sub for subscribers interested in events appended to either a single stream or all streams
"""
require Logger
alias EventStore.{RecordedEvent,Subscriptions}
@all_stream "$all"
def subscribe_to_stream(stream_uuid, subscription_name, subscriber, opts \\ [])
def subscribe_to_stream(stream_uuid, subscription_name, subscriber, opts) do
do_subscribe_to_stream(stream_uuid, subscription_name, subscriber, opts)
end
def subscribe_to_all_streams(subscription_name, subscriber, opts \\ [])
def subscribe_to_all_streams(subscription_name, subscriber, opts) do
do_subscribe_to_stream(@all_stream, subscription_name, subscriber, opts)
end
def unsubscribe_from_stream(stream_uuid, subscription_name) do
do_unsubscribe_from_stream(stream_uuid, subscription_name)
end
def unsubscribe_from_all_streams(subscription_name) do
do_unsubscribe_from_stream(@all_stream, subscription_name)
end
def notify_events(stream_uuid, events, serializer) do
events = Enum.map(events, &RecordedEvent.deserialize(&1, serializer))
Enum.each([
Task.async(fn -> notify_subscribers(@all_stream, events) end),
Task.async(fn -> notify_subscribers(stream_uuid, events) end),
], &Task.await(&1))
end
defp do_subscribe_to_stream(stream_uuid, subscription_name, subscriber, opts) do
_ = Logger.debug(fn -> "Creating subscription process on stream #{inspect stream_uuid} named: #{inspect subscription_name}" end)
case EventStore.Subscriptions.Supervisor.subscribe_to_stream(stream_uuid, subscription_name, subscriber, opts) do
{:ok, subscription} -> {:ok, subscription}
{:error, {:already_started, _subscription}} -> {:error, :subscription_already_exists}
end
end
defp do_unsubscribe_from_stream(stream_uuid, subscription_name) do
Subscriptions.Supervisor.unsubscribe_from_stream(stream_uuid, subscription_name)
end
defp notify_subscribers(stream_uuid, events) do
Registry.dispatch(EventStore.Subscriptions.PubSub, stream_uuid, fn subscribers ->
for {subscription, {module, function}} <- subscribers, do: apply(module, function, [subscription, events])
end)
end
end