public async Task <IEventStream> GetStream <T>(string bucket, string streamId, ISnapshot snapshot = null) where T : class, IEventSource
{
var streamName = _streamGen(typeof(T), bucket, streamId);
Logger.Write(LogLevel.Debug, () => $"Retreiving stream [{streamId}] in bucket [{bucket}]");
if (_shouldCache)
{
var cached = _cache.Retreive(streamName) as EventStream <T>;
if (cached != null && cached.CommitVersion >= (snapshot?.Version + 1))
{
HitMeter.Mark();
Logger.Write(LogLevel.Debug, () => $"Found stream [{streamName}] in cache");
return(new EventStream <T>(cached, Builder, this, snapshot));
}
MissMeter.Mark();
}
while (await CheckFrozen <T>(bucket, streamId).ConfigureAwait(false))
{
Logger.Write(LogLevel.Debug, () => $"Stream [{streamName}] is frozen - waiting");
Thread.Sleep(100);
}
var events = await _store.GetEvents(streamName, start : snapshot?.Version + 1).ConfigureAwait(false);
var eventstream = new EventStream <T>(Builder, this, bucket, streamId, events, snapshot);
if (_shouldCache)
{
await Cache <T>(eventstream).ConfigureAwait(false);
}
return(eventstream);
}
public async Task <T> Get <T>(string bucket, string stream) where T : class
{
var streamName = $"{_streamGen(typeof(T), bucket + ".POCO", stream)}";
Logger.Write(LogLevel.Debug, () => $"Getting stream [{streamName}]");
if (_shouldCache)
{
var cached = _cache.Retreive(streamName) as T;
if (cached != null)
{
HitMeter.Mark();
Logger.Write(LogLevel.Debug, () => $"Found poco [{stream}] bucket [{bucket}] in cache");
// An easy way to make a deep copy
return(JsonConvert.DeserializeObject <T>(JsonConvert.SerializeObject(cached)));
}
MissMeter.Mark();
}
var read = await _store.GetEventsBackwards(streamName, StreamPosition.End, 1).ConfigureAwait(false);
if (read == null || !read.Any())
{
return(null);
}
var @event = read.Single();
if (_shouldCache)
{
_cache.Cache(streamName, @event.Event);
}
return(@event.Event as T);
}
public async Task <IEventStream> GetStream <T>(String bucket, String stream, Int32?start = null) where T : class, IEntity
{
Logger.DebugFormat("Getting stream '{0}' in bucket '{1}'", stream, bucket);
var streamId = String.Format("{0}.{1}", bucket, stream);
var events = new List <ResolvedEvent>();
var readSize = _nsbSettings.Get <Int32>("ReadSize");
if (_shouldCache)
{
var cached = _cache.Retreive(streamId);
if (cached != null)
{
return(cached);
}
}
var settings = new JsonSerializerSettings
{
TypeNameHandling = TypeNameHandling.All,
Binder = new EventSerializationBinder(_mapper),
ContractResolver = new EventContractResolver(_mapper)
};
StreamEventsSlice current;
var sliceStart = start ?? StreamPosition.Start;
do
{
current = await _client.ReadStreamEventsForwardAsync(streamId, sliceStart, readSize, false);
events.AddRange(current.Events);
sliceStart = current.NextEventNumber;
} while (!current.IsEndOfStream);
var translatedEvents = events.Select(e =>
{
var descriptor = e.Event.Metadata.Deserialize(settings);
var data = e.Event.Data.Deserialize(e.Event.EventType, settings);
return(new Internal.WritableEvent
{
Descriptor = descriptor,
Event = data,
EventId = e.Event.EventId
});
});
var eventstream = new Internal.EventStream <T>(_builder, this, _snapshots, bucket, stream, current.LastEventNumber, translatedEvents);
if (_shouldCache)
{
_cache.Cache(streamId, eventstream.Clone());
}
return(eventstream);
}
public async Task <ISnapshot> GetSnapshot <T>(string bucket, string streamId) where T : class, IEventSource
{
var streamName = $"{_streamGen(typeof(T), bucket + ".SNAP", streamId)}";
Logger.Write(LogLevel.Debug, () => $"Getting snapshot for stream [{streamName}]");
if (_shouldCache)
{
var cached = _cache.Retreive(streamName) as ISnapshot;
if (cached != null)
{
HitMeter.Mark();
Logger.Write(LogLevel.Debug, () => $"Found snapshot [{streamName}] in cache");
return(cached);
}
MissMeter.Mark();
}
Logger.Write(LogLevel.Debug, () => $"Reading snapshot for stream [{streamName}] from store");
var read = await _store.GetEventsBackwards(streamName, StreamPosition.End, 1).ConfigureAwait(false);
if (read == null || !read.Any())
{
return(null);
}
var @event = read.Single();
var snapshot = new Snapshot
{
EntityType = @event.Descriptor.EntityType,
Bucket = bucket,
Stream = streamId,
Timestamp = @event.Descriptor.Timestamp,
Version = @event.Descriptor.Version,
Payload = @event.Event
};
if (_shouldCache)
{
_cache.Cache(streamName, snapshot);
}
return(snapshot);
}
