private Func <EventStoreCatchUpSubscription, ResolvedEvent, Task> EventAppeared(
ProjectionHandler projection,
string projectionName
) => async(_, e) =>
{
if (e.OriginalEvent.EventType.StartsWith("$"))
{
return;
}
var @event = this._eventDeserializer.Deserialize(Type.GetType(e.Event.EventType), Encoding.UTF8.GetString(e.Event.Data));
@event.ThrowsIfNull(new ArgumentNullException(nameof(@event)));
await projection.Handle(@event);
await _checkpointStore.SetLastCheckpoint(projectionName, e.OriginalPosition);
var metadata = this._eventDeserializer.Deserialize <EventMetadata>(Encoding.UTF8.GetString(e.Event.Metadata));
ISnapshotter snapshotStore = _snapshotters.FirstOrDefault(
x => x.ShouldTakeSnapshot(Type.GetType(metadata.AggregateAssemblyQualifiedName), e) && !metadata.IsSnapshot);
if (snapshotStore != null)
{
await snapshotStore.TakeSnapshotAsync(e.OriginalStreamId);
}
};
private Action <EventStoreCatchUpSubscription, ResolvedEvent> EventAppeared(
Projector <TConnection> projection,
string projectionName
) => async(_, e) =>
{
// check system event
if (e.OriginalEvent.EventType.StartsWith("$"))
{
return;
}
// get the configured clr type name for deserializing the event
//var eventType = _typeMapper.GetType(e.Event.EventType);
// try to execute the projection
await projection.ProjectAsync(_getConnection(), ComposeEnvelope(_serializer.Deserialize(e), e.OriginalPosition.Value.CommitPosition));
Log.Debug("{projection} projected {eventType}({eventId})", projectionName, e.Event.EventType, e.Event.EventId);
//**** Storing Checkpoint ****/
//1.Way
// await projection.ProjectAsync(_getConnection(), new SetProjectionPosition(e.OriginalPosition));
//2.Way
await _checkpointStore.SetLastCheckpoint(projectionName, e.OriginalPosition);
var metadata = JsonConvert.DeserializeObject <EventMetadata>(Encoding.UTF8.GetString(e.Event.Metadata));
ISnapshotter snapshotter = _snapshotters.FirstOrDefault(
x => x.ShouldTakeSnapshot(Type.GetType(metadata.AggregateAssemblyQualifiedName), e) && !metadata.IsSnapshot);
if (snapshotter != null)
{
await snapshotter.Take(e.OriginalStreamId);
Log.Debug("Snapshot was taken for {aggregate} on event{eventType}{eventId} at number {eventNumber}",
metadata.AggregateType, e.Event.EventType, e.Event.EventId, e.Event.EventNumber);
}
};