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eventstore
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Event store using PostgreSQL for persistence.
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Files
lib/event_store/subscriptions.ex
defmodule EventStore.Subscriptions do
@moduledoc false
alias EventStore.{Storage, Subscriptions}
alias EventStore.Subscriptions.Subscription
@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 delete_subscription(conn, stream_uuid, subscription_name, opts \\ []) do
:ok = Subscriptions.Supervisor.shutdown_subscription(stream_uuid, subscription_name)
Storage.delete_subscription(conn, stream_uuid, subscription_name, opts)
end
defp do_subscribe_to_stream(stream_uuid, subscription_name, subscriber, opts) do
case Subscriptions.Supervisor.start_subscription(stream_uuid, subscription_name, opts) do
{:ok, subscription} ->
Subscription.connect(subscription, subscriber, opts)
{:error, {:already_started, subscription}} ->
case Keyword.get(opts, :concurrency_limit) do
nil ->
{:error, :subscription_already_exists}
concurrency_limit when is_number(concurrency_limit) ->
Subscription.connect(subscription, subscriber, opts)
end
end
end
defp do_unsubscribe_from_stream(stream_uuid, subscription_name) do
Subscriptions.Supervisor.unsubscribe_from_stream(stream_uuid, subscription_name)
end
end