/// <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();
}
}
}
}
