private void LoadProjectionListCompleted(
ClientMessage.ReadEventsBackwardsCompleted completed, int requestedFrom)
{
if (completed.Result == RangeReadResult.Success && completed.Events.Length > 0)
{
if (completed.NextEventNumber != -1)
{
BeginLoadProjectionList(@from: completed.NextEventNumber);
}
foreach (var @event in completed.Events.Where(v => v.EventType == "ProjectionCreated"))
{
var projectionName = Encoding.UTF8.GetString(@event.Data);
if (_projections.ContainsKey(projectionName))
{
//TODO: log this event as it should not happen
continue; // ignore older attempts to create a projection
}
var managedProjection = CreateManagedProjectionInstance(projectionName);
managedProjection.InitializeExisting(projectionName);
}
}
else
{
if (requestedFrom == -1)
{
_logger.Info(
"Projection manager is initializing from the empty {0} stream", completed.EventStreamId);
CreatePredefinedProjections();
}
}
}
private void LoadCompleted(ClientMessage.ReadEventsBackwardsCompleted completed)
{
if (completed.Result == RangeReadResult.Success && completed.Events.Length == 1)
{
byte[] state = completed.Events[0].Data;
LoadPersistedState(state.ParseJson <PersistedState>());
//TODO: encapsulate this into managed projection
_state = ManagedProjectionState.Stopped;
StartIfEnabled();
return;
}
_state = ManagedProjectionState.Creating;
_logger.Info(
"Projection manager did not find any projection configuration records in the {0} stream. Projection stays in CREATING state",
completed.EventStreamId);
}
public void Handle(ClientMessage.ReadEventsBackwardsCompleted message)
{
if (!_awaitingListEventsCompleted)
{
throw new InvalidOperationException("ReadEventsBackwards has not been requested");
}
_awaitingListEventsCompleted = false;
if (message.Events.Length == 0)
{
_lastCommittedMetadata = null;
_lastKnownEventNumber = ExpectedVersion.NoStream;
SubmitWriteEvents();
}
else
{
var projectionStateMetadata = message.Events[0].Metadata.ParseJson <CheckpointTag>();
_lastCommittedMetadata = projectionStateMetadata;
_lastKnownEventNumber = message.Events[0].EventNumber;
SubmitWriteEventsInRecovery();
}
}
public void Handle(ClientMessage.ReadEventsBackwardsCompleted message)
{
_readDispatcher.Handle(message);
}
