View Source Commanded.EventStore.Adapter behaviour (Commanded v1.4.3)
Defines the behaviour to be implemented by an event store adapter to be used by Commanded.
Summary
Callbacks
Acknowledge receipt and successful processing of the given event received from a subscription to an event stream.
Append one or more events to a stream atomically.
Return a child spec defining all processes required by the event store.
Delete a previously recorded snapshot for a given source
Delete an existing subscription.
Read a snapshot, if available, for a given source.
Record a snapshot of the data and metadata for a given source
Streams events from the given stream, in the order in which they were originally written.
Create a transient subscription to a single event stream.
Create a persistent subscription to an event stream.
Unsubscribe an existing subscriber from event notifications.
Types
@type adapter_meta() :: map()
@type application() :: Commanded.Application.t()
@type config() :: Keyword.t()
@type error() :: term()
@type expected_version() :: :any_version | :no_stream | :stream_exists | non_neg_integer()
@type source_uuid() :: String.t()
@type start_from() :: :origin | :current | integer()
@type stream_uuid() :: String.t()
@type subscriber() :: pid()
@type subscription() :: any()
@type subscription_name() :: String.t()
Callbacks
@callback ack_event(adapter_meta(), pid(), Commanded.EventStore.RecordedEvent.t()) :: :ok
Acknowledge receipt and successful processing of the given event received from a subscription to an event stream.
append_to_stream(adapter_meta, stream_uuid, expected_version, events, opts)
View Source@callback append_to_stream( adapter_meta(), stream_uuid(), expected_version(), events :: [Commanded.EventStore.EventData.t()], opts :: Keyword.t() ) :: :ok | {:error, :wrong_expected_version} | {:error, error()}
Append one or more events to a stream atomically.
@callback child_spec(application(), config()) :: {:ok, [:supervisor.child_spec() | {module(), term()} | module()], adapter_meta()}
Return a child spec defining all processes required by the event store.
@callback delete_snapshot(adapter_meta(), source_uuid()) :: :ok | {:error, error()}
Delete a previously recorded snapshot for a given source
@callback delete_subscription( adapter_meta(), stream_uuid() | :all, subscription_name() ) :: :ok | {:error, :subscription_not_found} | {:error, error()}
Delete an existing subscription.
@callback read_snapshot(adapter_meta(), source_uuid()) :: {:ok, Commanded.EventStore.SnapshotData.t()} | {:error, :snapshot_not_found}
Read a snapshot, if available, for a given source.
@callback record_snapshot(adapter_meta(), Commanded.EventStore.SnapshotData.t()) :: :ok | {:error, error()}
Record a snapshot of the data and metadata for a given source
stream_forward(adapter_meta, stream_uuid, start_version, read_batch_size)
View Source@callback stream_forward( adapter_meta(), stream_uuid(), start_version :: non_neg_integer(), read_batch_size :: non_neg_integer() ) :: Enumerable.t() | {:error, :stream_not_found} | {:error, error()}
Streams events from the given stream, in the order in which they were originally written.
@callback subscribe(adapter_meta(), stream_uuid() | :all) :: :ok | {:error, error()}
Create a transient subscription to a single event stream.
The event store will publish any events appended to the given stream to the
subscriber process as an {:events, events} message.
The subscriber does not need to acknowledge receipt of the events.
subscribe_to(adapter_meta, arg2, subscription_name, subscriber, start_from, opts)
View Source@callback subscribe_to( adapter_meta(), stream_uuid() | :all, subscription_name(), subscriber(), start_from(), opts :: Keyword.t() ) :: {:ok, subscription()} | {:error, :subscription_already_exists} | {:error, error()}
Create a persistent subscription to an event stream.
@callback unsubscribe(adapter_meta(), subscription()) :: :ok
Unsubscribe an existing subscriber from event notifications.
This should not delete the subscription.