protected async ValueTask Tell(IFullyEvent <PrimaryKey> @event)
{
if (Logger.IsEnabled(LogLevel.Trace))
{
Logger.LogTrace(LogEventIds.FollowEventProcessing, "Start event handling, grain Id = {0} and state version = {1},event type = {2} ,event = {3}", GrainId.ToString(), Snapshot.Version, @event.GetType().FullName, Serializer.SerializeToString(@event));
}
try
{
if (@event.Base.Version == Snapshot.Version + 1)
{
var onEventDeliveredTask = OnEventDelivered(@event);
if (!onEventDeliveredTask.IsCompletedSuccessfully)
{
await onEventDeliveredTask;
}
Snapshot.FullUpdateVersion(@event.Base, GrainType);//更新处理完成的Version
}
else if (@event.Base.Version > Snapshot.Version)
{
var eventList = await EventStorage.GetList(GrainId, Snapshot.StartTimestamp, Snapshot.Version + 1, @event.Base.Version - 1);
foreach (var evt in eventList)
{
var onEventDeliveredTask = OnEventDelivered(evt);
if (!onEventDeliveredTask.IsCompletedSuccessfully)
{
await onEventDeliveredTask;
}
Snapshot.FullUpdateVersion(evt.Base, GrainType);//更新处理完成的Version
}
}
if (@event.Base.Version == Snapshot.Version + 1)
{
var onEventDeliveredTask = OnEventDelivered(@event);
if (!onEventDeliveredTask.IsCompletedSuccessfully)
{
await onEventDeliveredTask;
}
Snapshot.FullUpdateVersion(@event.Base, GrainType);//更新处理完成的Version
}
if (@event.Base.Version > Snapshot.Version)
{
throw new EventVersionNotMatchStateException(GrainId.ToString(), GrainType, @event.Base.Version, Snapshot.Version);
}
await SaveSnapshotAsync();
if (Logger.IsEnabled(LogLevel.Trace))
{
Logger.LogTrace(LogEventIds.FollowEventProcessing, "Event Handling Completion, grain Id ={0} and state version = {1},event type = {2}", GrainId.ToString(), Snapshot.Version, @event.GetType().FullName);
}
}
catch (Exception ex)
{
if (Logger.IsEnabled(LogLevel.Critical))
{
Logger.LogCritical(LogEventIds.FollowEventProcessing, ex, "FollowGrain Event handling failed with Id = {0},event = {1}", GrainId.ToString(), Serializer.SerializeToString(@event));
}
throw;
}
}
protected virtual ValueTask OnEventDelivered(IFullyEvent <PrimaryKey> @event)
{
try
{
SnapshotHandler.Apply(Snapshot, @event);
}
catch (Exception ex)
{
Logger.LogCritical(ex, "Delivered failed: {0}->{1}->{2}", GrainType.FullName, GrainId.ToString(), Serializer.Serialize(@event, @event.GetType()));
}
return(Consts.ValueTaskDone);
}