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eventstore
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Event store using PostgreSQL for persistence.
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lib/event_store/subscriptions/stream_subscription_provider.ex
defmodule EventStore.Subscriptions.StreamSubscriptionProvider do
@moduledoc """
Specification to access subscription related event info from a single, or all streams
"""
@type event :: EventStore.RecordedEvent.t
@type subscription :: EventStore.Storage.Subscription.t
@type stream_uuid :: String.t
@type subscription_name :: String.t
@type last_seen :: non_neg_integer()
@type read_batch_size :: non_neg_integer()
@doc """
Get the stream identity from the given event.
"""
@callback event_id(event) :: non_neg_integer()
@doc """
Get the last ack'd event for the given subscription
"""
@callback last_ack(subscription) :: non_neg_integer()
@doc """
Get a stream of events since the last seen, fetched in batches limited to given size
"""
@callback unseen_event_stream(stream_uuid, last_seen, read_batch_size) :: Enumerable.t
@doc """
Acknowledge receipt of the last seen event for the stream and subscription
"""
@callback ack_last_seen_event(stream_uuid, subscription_name, last_seen) :: :ok | {:error, reason :: any()}
end