private bool TryGetFromSnapshot(string aggregateRootId, Type aggregateRootType, out IAggregateRoot aggregateRoot)
{
aggregateRoot = _aggregateSnapshotter.RestoreFromSnapshot(aggregateRootType, aggregateRootId);
if (aggregateRoot == null)
{
return(false);
}
if (aggregateRoot.GetType() != aggregateRootType || aggregateRoot.UniqueId != aggregateRootId)
{
throw new Exception(string.Format("AggregateRoot recovery from snapshot is invalid as the aggregateRootType or aggregateRootId is not matched. Snapshot: [aggregateRootType:{0},aggregateRootId:{1}], expected: [aggregateRootType:{2},aggregateRootId:{3}]",
aggregateRoot.GetType(),
aggregateRoot.UniqueId,
aggregateRootType,
aggregateRootId));
}
var aggregateRootTypeName = _typeNameProvider.GetTypeName(aggregateRootType);
var eventStreamsAfterSnapshot = _eventStore.QueryAggregateEvents(aggregateRootId, aggregateRootTypeName, aggregateRoot.Version + 1, int.MaxValue);
aggregateRoot.ReplayEvents(eventStreamsAfterSnapshot);
return(true);
}
private bool TryGetFromSnapshot(string aggregateRootId, Type aggregateRootType, out IAggregateRoot aggregateRoot)
{
aggregateRoot = null;
var snapshot = _snapshotStore.GetLastestSnapshot(aggregateRootId, aggregateRootType);
if (snapshot == null)
{
return(false);
}
aggregateRoot = _snapshotter.RestoreFromSnapshot(snapshot);
if (aggregateRoot == null)
{
return(false);
}
if (aggregateRoot.UniqueId != aggregateRootId)
{
throw new Exception(string.Format("Aggregate root restored from snapshot not valid as the aggregate root id not matched. Snapshot aggregate root id:{0}, expected aggregate root id:{1}", aggregateRoot.UniqueId, aggregateRootId));
}
var aggregateRootTypeCode = _aggregateRootTypeCodeProvider.GetTypeCode(aggregateRootType);
var eventStreamsAfterSnapshot = _eventStore.QueryAggregateEvents(aggregateRootId, aggregateRootTypeCode, snapshot.Version + 1, int.MaxValue);
aggregateRoot.ReplayEvents(eventStreamsAfterSnapshot);
return(true);
}
private bool TryGetFromSnapshot(string aggregateRootId, Type aggregateRootType, out IAggregateRoot aggregateRoot)
{
aggregateRoot = _aggregateSnapshotter.RestoreFromSnapshot(aggregateRootType, aggregateRootId);
if (aggregateRoot == null) return false;
if (aggregateRoot.GetType() != aggregateRootType || aggregateRoot.UniqueId != aggregateRootId)
{
throw new Exception(string.Format("AggregateRoot recovery from snapshot is invalid as the aggregateRootType or aggregateRootId is not matched. Snapshot: [aggregateRootType:{0},aggregateRootId:{1}], expected: [aggregateRootType:{2},aggregateRootId:{3}]",
aggregateRoot.GetType(),
aggregateRoot.UniqueId,
aggregateRootType,
aggregateRootId));
}
var aggregateRootTypeName = _typeNameProvider.GetTypeName(aggregateRootType);
var eventStreamsAfterSnapshot = _eventStore.QueryAggregateEvents(aggregateRootId, aggregateRootTypeName, aggregateRoot.Version + 1, int.MaxValue);
aggregateRoot.ReplayEvents(eventStreamsAfterSnapshot);
return true;
}
private bool TryGetFromSnapshot(string aggregateRootId, Type aggregateRootType, out IAggregateRoot aggregateRoot)
{
aggregateRoot = null;
var snapshot = _snapshotStore.GetLastestSnapshot(aggregateRootId, aggregateRootType);
if (snapshot == null) return false;
aggregateRoot = _snapshotter.RestoreFromSnapshot(snapshot);
if (aggregateRoot == null) return false;
if (aggregateRoot.UniqueId != aggregateRootId)
{
throw new Exception(string.Format("Aggregate root restored from snapshot not valid as the aggregate root id not matched. Snapshot aggregate root id:{0}, expected aggregate root id:{1}", aggregateRoot.UniqueId, aggregateRootId));
}
var aggregateRootTypeCode = _aggregateRootTypeCodeProvider.GetTypeCode(aggregateRootType);
var eventStreamsAfterSnapshot = _eventStore.QueryAggregateEvents(aggregateRootId, aggregateRootTypeCode, snapshot.Version + 1, int.MaxValue);
aggregateRoot.ReplayEvents(eventStreamsAfterSnapshot);
return true;
}
/// <summary>
/// Save
/// </summary>
/// <param name="snapshotHeaders"></param>
/// <returns></returns>
public async Task SaveAsync(IEnumerable <AggregateSnapshotHeader> snapshotHeaders)
{
var queue = new ConcurrentQueue <AggregateSnapshotData>();
foreach (var snapshotHeader in snapshotHeaders)
{
try
{
var aggregateRootType = _typeNameProvider.GetType(snapshotHeader.AggregateRootTypeName);
IAggregateRoot aggregateRoot = null;
IEnumerable <DomainEventStream> eventStreams = null;
var lastSnapshotData = await _snapshotStore.FindLatestAsync(snapshotHeader.AggregateRootId, snapshotHeader.AggregateRootTypeName);
if (lastSnapshotData != null)
{
try
{
using (var ms = new MemoryStream())
{
await ms.WriteAsync(lastSnapshotData.Data, 0, lastSnapshotData.Data.Length);
await ms.FlushAsync();
ms.Position = 0;
aggregateRoot = _binaryFormatter.Deserialize(ms) as IAggregateRoot;
}
}
catch
{
aggregateRoot = null;
}
}
if (aggregateRoot == null)
{
// 无快照
aggregateRoot = _aggregateRootFactory.CreateAggregateRoot(aggregateRootType);
eventStreams = await _eventStore.QueryAggregateEventsAsync(snapshotHeader.AggregateRootId, snapshotHeader.AggregateRootTypeName, 1, snapshotHeader.Version);
}
else
{
eventStreams = await _eventStore.QueryAggregateEventsAsync(snapshotHeader.AggregateRootId, snapshotHeader.AggregateRootTypeName, lastSnapshotData.Version + 1, snapshotHeader.Version);
}
if (eventStreams != null && eventStreams.Any())
{
aggregateRoot.ReplayEvents(eventStreams);
using (var ms = new MemoryStream())
{
_binaryFormatter.Serialize(ms, aggregateRoot);
await ms.FlushAsync();
ms.Position = 0;
byte[] buffer = new byte[ms.Length];
await ms.ReadAsync(buffer, 0, buffer.Length);
queue.Enqueue(new AggregateSnapshotData(snapshotHeader.AggregateRootId, snapshotHeader.AggregateRootTypeName, aggregateRoot.Version, buffer));
}
}
}
catch (Exception ex)
{
_logger.Error($"Save snapshot fail:{ex.Message}. AggregateRootId={snapshotHeader.AggregateRootId},AggregateRootTypeName={snapshotHeader.AggregateRootTypeName}", ex);
}
}
var snapshotDataList = new List <AggregateSnapshotData>();
while (queue.TryDequeue(out AggregateSnapshotData snapshotData))
{
snapshotDataList.Add(snapshotData);
if (snapshotDataList.Count == _batchSaveSize)
{
try
{
await _snapshotStore.BatchSaveAsync(snapshotDataList);
}
catch (Exception ex)
{
_logger.Error($"Save snapshot fail:{ex.Message}.", ex);
}
finally
{
snapshotDataList.Clear();
}
}
}
}
private bool TryGetFromCompatibleAggregateStore(string aggregateRootId, Type aggregateRootType,
ICompatibleStoreHandler aggregateInitHandler, CompatibleStyle compatibleStyle, out IAggregateRoot aggregateRoot)
{
aggregateRoot = null;
var aggregateRootTypeCode = _aggregateRootTypeCodeProvider.GetTypeCode(aggregateRootType);
if (compatibleStyle == CompatibleStyle.RepositoryOnly)
{
// Replay Repository Aggregate Init Event
DomainEventStream aggregateInitEvent = aggregateInitHandler.GetAggregateRestoreEventStream(aggregateRootId);
if (aggregateInitEvent != null)
{
if (aggregateInitEvent.AggregateRootId != aggregateRootId)
{
throw new Exception(string.Format("DomainEventStream.AggregateRootId error: {0}, expected aggregate root id:{1}", aggregateInitEvent.AggregateRootId, aggregateRootId));
}
aggregateRoot = _aggregateRootFactory.CreateAggregateRoot(aggregateRootType);
aggregateRoot.RestoreFromEvents(aggregateInitEvent);
return(true);
}
return(false);
}
else if (compatibleStyle == CompatibleStyle.RepositoryThenEventSourcing)
{
var versionStart = minVersion;
// Replay Repository Aggregate Init Event
//IDomainEvent aggregateInitEvent = _compatibleAggregateStore.GetAggregateInitEvent(aggregateRootType, aggregateRootId);
DomainEventStream aggregateInitEvent = aggregateInitHandler.GetAggregateRestoreEventStream(aggregateRootId);
if (aggregateInitEvent != null)
{
if (aggregateInitEvent.AggregateRootId != aggregateRootId)
{
throw new Exception(string.Format("DomainEventStream.AggregateRootId error: {0}, expected aggregate root id:{1}", aggregateInitEvent.AggregateRootId, aggregateRootId));
}
aggregateRoot = _aggregateRootFactory.CreateAggregateRoot(aggregateRootType);
aggregateRoot.RestoreFromEvents(aggregateInitEvent);
versionStart = aggregateInitEvent.Version + 1;
}
// Replay Event Sourcing Events
var eventStreams = _eventStore.QueryAggregateEvents(aggregateRootId, aggregateRootTypeCode, versionStart, maxVersion);
if (eventStreams == null || !eventStreams.Any())
{
if (aggregateRoot != null)
{
return(true);
}
else
{
return(false);
}
}
aggregateRoot.ReplayEvents(eventStreams);
return(true);
}
else //if(compatibleStyle == CompatibleAggregateInitStyle.EventSourcingOnly)
{
// Replay Event Sourcing Events
var versionStart = minVersion;
var eventStreams = _eventStore.QueryAggregateEvents(aggregateRootId, aggregateRootTypeCode, versionStart, maxVersion);
if (eventStreams == null || !eventStreams.Any())
{
return(false);
}
aggregateRoot = _aggregateRootFactory.CreateAggregateRoot(aggregateRootType);
aggregateRoot.ReplayEvents(eventStreams);
return(true);
}
}
