private async Task <EventStoreTransaction> StartTransaction(string stream, long expectedVersion)
{
var transaction = await _eventStore.StartTransactionAsync(stream, expectedVersion);
_transactionDictionary.Add(stream, transaction.TransactionId);
return(transaction);
}
public async Task <StreamWriteResult> SaveEvents(StreamId streamId, long streamVersion, List <IDomainEvent> events)
{
if (events.Any() == false)
{
return(new StreamWriteResult(-1));
}
var commitId = Guid.NewGuid();
var expectedVersion = streamVersion == 0 ? ExpectedVersion.NoStream : streamVersion - 1;
var eventsToSave = events.Select(domainEvent => ToEventData(commitId, domainEvent)).ToList();
if (eventsToSave.Count < WriteBatchSize)
{
var result = await _connection.AppendToStreamAsync(streamId.ToString(), expectedVersion, eventsToSave);
return(new StreamWriteResult(result.NextExpectedVersion));
}
using (var transaction = await _connection.StartTransactionAsync(streamId.ToString(), expectedVersion))
{
var position = 0;
while (position < eventsToSave.Count)
{
var pageEvents = eventsToSave.Skip(position).Take(WriteBatchSize);
await transaction.WriteAsync(pageEvents);
position += WriteBatchSize;
}
var result = await transaction.CommitAsync();
return(new StreamWriteResult(result.NextExpectedVersion));
}
}
private async Task AppendEventsInternalAsync(string streamName, long expectedVersion, ICollection <EventData> events)
{
using (Profiler.TraceMethod <GetEventStore>(nameof(AppendAsync)))
{
Guard.NotNullOrEmpty(streamName, nameof(streamName));
Guard.NotNull(events, nameof(events));
if (events.Count == 0)
{
return;
}
var eventsToSave = events.Select(Formatter.Write).ToList();
if (eventsToSave.Count < WritePageSize)
{
await connection.AppendToStreamAsync(GetStreamName(streamName), expectedVersion, eventsToSave);
}
else
{
using (var transaction = await connection.StartTransactionAsync(GetStreamName(streamName), expectedVersion))
{
for (var p = 0; p < eventsToSave.Count; p += WritePageSize)
{
await transaction.WriteAsync(eventsToSave.Skip(p).Take(WritePageSize));
}
await transaction.CommitAsync();
}
}
}
}
public static EventStoreTransaction StartTransaction(this IEventStoreConnection con, string stream, int expectedVersion, UserCredentials userCredentials = null)
{
var task = con.StartTransactionAsync(stream, expectedVersion, userCredentials);
task.Wait();
return(task.Result);
}
protected override async Task <IReadOnlyCollection <ICommittedDomainEvent> > CommitEventsAsync <TAggregate, TIdentity>(
TIdentity id,
IReadOnlyCollection <SerializedEvent> serializedEvents,
CancellationToken cancellationToken)
{
var aggregateName = typeof(TAggregate).Name;
var committedDomainEvents = serializedEvents
.Select(e => new EventStoreEvent
{
AggregateSequenceNumber = e.AggregateSequenceNumber,
Metadata = e.SerializedMetadata,
AggregateId = id.Value,
AggregateName = aggregateName,
Data = e.SerializedData
})
.ToList();
var expectedVersion = Math.Max(serializedEvents.Min(e => e.AggregateSequenceNumber) - 1, 0);
var eventDatas = serializedEvents
.Select(e =>
{
var guid = Guid.Parse(e.Metadata["guid"]);
var eventType = string.Format("{0}.{1}.{2}", aggregateName, e.Metadata.EventName, e.Metadata.EventVersion);
var data = Encoding.UTF8.GetBytes(e.SerializedData);
var meta = Encoding.UTF8.GetBytes(e.SerializedMetadata);
return(new EventData(guid, eventType, true, data, meta));
})
.ToList();
try
{
using (var transaction = await _connection.StartTransactionAsync(
id.Value,
expectedVersion == 0 ? ExpectedVersion.NoStream : expectedVersion)
.ConfigureAwait(false))
{
await transaction.WriteAsync(eventDatas).ConfigureAwait(false);
var writeResult = await transaction.CommitAsync().ConfigureAwait(false);
Log.Verbose(
"Wrote aggregate {0} with version {1} ({2},{3})",
aggregateName,
writeResult.NextExpectedVersion - 1,
writeResult.LogPosition.CommitPosition,
writeResult.LogPosition.PreparePosition);
}
}
catch (WrongExpectedVersionException e)
{
throw new OptimisticConcurrencyException(e.Message, e);
}
return(committedDomainEvents);
}
private EventStoreTransaction GetTransaction(string streamId, int expectedVersion)
{
EventStoreTransaction transaction;
if (!_transactions.TryGetValue(streamId, out transaction))
{
_logger.Debug(this, $"Starting new transaction for stream {streamId} at expected version {expectedVersion}");
transaction = _eventStoreConnection.StartTransactionAsync(streamId, expectedVersion).Result;
_transactions.Add(streamId, transaction);
}
return(transaction);
}
public async void Save(IAggregate aggregate, Guid commitId, IDictionary <string, object> updateHeaders = null)
{
// standard data for metadata portion of persisted event
var commitHeaders = new Dictionary <string, object>
{
// handy tracking id
{ CommitIdHeader, commitId },
// type of aggregate being persisted
{ AggregateClrTypeHeader, aggregate.GetType().AssemblyQualifiedName }
};
// add extra data to metadata portion of presisted event
commitHeaders = (updateHeaders ?? new Dictionary <string, object>())
.Concat(commitHeaders)
.GroupBy(d => d.Key)
.ToDictionary(d => d.Key, d => d.First().Value);
// streamname is created by func, by default agg type concat to agg id
var streamName = _aggregateIdToStreamName(aggregate.GetType(), aggregate.Id);
// get all uncommitted events
var newEvents = aggregate.GetUncommittedEvents().Cast <object>().ToList();
// process events so they fit the expectations of GES
var eventsToSave = newEvents.Select(e => ToEventData(Guid.NewGuid(), e, commitHeaders)).ToList();
// calculate the expected version of the agg root in event store to detirmine if concurrency conflict
var originalVersion = aggregate.Version - newEvents.Count;
var expectedVersion = originalVersion == 0 ? ExpectedVersion.NoStream : originalVersion - 1;
// if numberr of events to save is small enough it can happen in one call
if (eventsToSave.Count < WritePageSize)
{
await _eventStoreConnection.AppendToStreamAsync(streamName, expectedVersion, eventsToSave);
}
// otherwise batch events and start transaction
else
{
var transaction = await _eventStoreConnection.StartTransactionAsync(streamName, expectedVersion);
var position = 0;
while (position < eventsToSave.Count)
{
var pageEvents = eventsToSave.Skip(position).Take(WritePageSize);
await transaction.WriteAsync(pageEvents);
position += WritePageSize;
}
await transaction.CommitAsync();
}
aggregate.ClearUncommittedEvents();
}
public async Task SaveAsync(T eventSourced, string correlationId, bool ignoreVersionCheck)
{
// Guarantee incremental versions
var expectedVersion = ignoreVersionCheck ? ExpectedVersion.Any : eventSourced.Version - eventSourced.Events.Count();
var events = eventSourced.Events.Select(e => Serialize(e, correlationId));
using (var transaction = await _eventStore.StartTransactionAsync(GetEventStoreStream(eventSourced.Id), expectedVersion))
{
await transaction.WriteAsync(events);
await transaction.CommitAsync();
}
}
private async Task SaveAggregatesEvents()
{
foreach (var aggregate in _trackedAggregates)
{
using (var transaction = await _context.StartTransactionAsync(StreamNameGenerator.Generate(aggregate), aggregate.CurrentVersion))
{
await transaction.WriteAsync(aggregate.GetUnCommittedChanges().ToEventData());
await transaction.CommitAsync();
await _snapshotter.TakeSnapshotIfNeed(aggregate);
}
}
}
private async Task WriteEventsInPages(string streamName, int expectedStreamVersion, List <EventData> eventsToSave)
{
var transaction = await connection.StartTransactionAsync(streamName, expectedStreamVersion);
var position = 0;
while (position < eventsToSave.Count)
{
var pageEvents = eventsToSave.Skip(position).Take(WritePageSize);
await transaction.WriteAsync(pageEvents);
position += WritePageSize;
}
await transaction.CommitAsync();
}
public void Save(IAggregate aggregate, Guid commitId, Action <IDictionary <string, object> > updateHeaders)
{
var commitHeaders = new Dictionary <string, object>
{
{ CommitIdHeader, commitId },
{ AggregateClrTypeHeader, aggregate.GetType().AssemblyQualifiedName }
};
updateHeaders(commitHeaders);
var streamName = _aggregateIdToStreamName(aggregate.GetType(), aggregate.Id);
var newEvents = aggregate.GetUncommittedEvents().Cast <object>().ToList();
var originalVersion = aggregate.Version - newEvents.Count;
var expectedVersion = originalVersion == 0 ? ExpectedVersion.NoStream : originalVersion - 1;
var eventsToSave = newEvents.Select(e => ToEventData(Guid.NewGuid(), e, commitHeaders)).ToList();
if (eventsToSave.Count < WritePageSize)
{
_eventStoreConnection.AppendToStreamAsync(streamName, expectedVersion, eventsToSave).Wait();
}
else
{
var transaction = _eventStoreConnection.StartTransactionAsync(streamName, expectedVersion).Result;
var position = 0;
while (position < eventsToSave.Count)
{
var pageEvents = eventsToSave.Skip(position).Take(WritePageSize);
transaction.WriteAsync(pageEvents).Wait();
position += WritePageSize;
}
transaction.CommitAsync().Wait();
}
if (_outBus != null)
{
foreach (var evt in newEvents)
{
try
{
_outBus.Publish((Message)evt);
}
catch { }//TODO: see if we need to do something here
}
}
aggregate.ClearUncommittedEvents();
}
public async Task SaveAsync <TAggregate>(TAggregate aggregate) where TAggregate : Aggregate
{
var commitHeaders = new Dictionary <string, object>
{
{ CommitIdHeader, aggregate.Id },
{ AggregateClrTypeHeader, aggregate.GetType().AssemblyQualifiedName }
};
var streamName = AggregateIdToStreamName(aggregate.GetType(), aggregate.Id);
var eventsToPublish = aggregate.GetUncommittedEvents();
var newEvents = eventsToPublish.Cast <object>().ToList();
var originalVersion = aggregate.Version - newEvents.Count;
var expectedVersion = originalVersion == -1 ? ExpectedVersion.NoStream : originalVersion;
var eventsToSave = newEvents.Select(e => ToEventData(Guid.NewGuid(), e, commitHeaders)).ToList();
if (eventsToSave.Count < WritePageSize)
{
await eventStoreConnection.AppendToStreamAsync(streamName, expectedVersion, eventsToSave);
}
else
{
var transaction = await eventStoreConnection.StartTransactionAsync(streamName, expectedVersion);
var position = 0;
while (position < eventsToSave.Count)
{
var pageEvents = eventsToSave.Skip(position).Take(WritePageSize);
await transaction.WriteAsync(pageEvents);
position += WritePageSize;
}
await transaction.CommitAsync();
}
if (bus != null)
{
foreach (var e in eventsToPublish)
{
bus.Publish(e);
}
}
aggregate.MarkEventsAsCommitted();
}
public async Task <long> SaveAsync(AggregateBase aggregate, params KeyValuePair <string, string>[] extraHeaders)
{
var streamName = aggregate.Identifier.ToString();
var pendingEvents = aggregate.GetPendingEvents();
var originalVersion = aggregate.Version - pendingEvents.Count;
try
{
WriteResult result;
var commitHeaders = CreateCommitHeaders(aggregate, extraHeaders);
var eventsToSave = pendingEvents.Select(x => ToEventData(Guid.NewGuid(), x, commitHeaders));
var eventBatches = GetEventBatches(eventsToSave);
if (eventBatches.Count == 1)
{
result = await _eventStoreConnection.AppendToStreamAsync(streamName, originalVersion, eventBatches[0]);
}
else
{
// If we have more events to save than can be done in one batch according to the WritePageSize, then we need to save them in a transaction to ensure atomicity
using (var transaction = await _eventStoreConnection.StartTransactionAsync(streamName, originalVersion))
{
foreach (var batch in eventBatches)
{
await transaction.WriteAsync(batch);
}
result = await transaction.CommitAsync();
}
}
aggregate.ClearPendingEvents();
return(result.NextExpectedVersion);
}
catch (Exception ex)
{
_logger.LogError($"Failed to write events for stream: {streamName}.", ex);
ExceptionDispatchInfo.Capture(ex).Throw();
}
return(originalVersion + 1);
}
public void SetUp()
{
_firstEvent = TestEvent.NewTestEvent();
_connection = BuildConnection();
_connection.ConnectAsync().Wait();
_stream = TestContext.CurrentContext.Test.FullName;
Assert.AreEqual(2, _connection.AppendToStreamAsync(_stream,
ExpectedVersion.NoStream,
_firstEvent,
TestEvent.NewTestEvent(),
TestEvent.NewTestEvent()).Result.NextExpectedVersion);
using (var transaction = _connection.StartTransactionAsync(_stream, 2).Result)
{
Assert.AreEqual(2, transaction.CommitAsync().Result.NextExpectedVersion);
}
}
public void SaveEvents(AggregateKey key, int expectedRevision, IEnumerable <DomainEvent> uncommittedEvents)
{
var commitHeaders = new Dictionary <string, object>
{
{ CommitIdHeader, Guid.NewGuid() },
{ AggregateClrTypeHeader, key.AggregateType.AssemblyQualifiedName }
};
var streamName = _aggregateIdToStreamName(key.AggregateType, key.AggregateId);
var newEvents = uncommittedEvents.Cast <object>().ToList();
var expectedVersion = expectedRevision <= 0 ? ExpectedVersion.NoStream : expectedRevision - 1;
expectedVersion = ExpectedVersion.Any;
var preparedEvents = PrepareEvents(newEvents, commitHeaders).ToList();
if (preparedEvents.Count < WritePageSize)
{
_eventStoreConnection
.AppendToStreamAsync(streamName, expectedVersion, preparedEvents)
.Wait();
}
else
{
var transaction = _eventStoreConnection
.StartTransactionAsync(streamName, expectedVersion)
.Result;
var position = 0;
while (position < preparedEvents.Count)
{
var pageEvents = preparedEvents.Skip(position).Take(WritePageSize);
transaction.WriteAsync(pageEvents).Wait();
position += WritePageSize;
}
transaction.CommitAsync().Wait();
}
foreach (var @event in uncommittedEvents)
{
_publisher.Publish(@event);
}
}
protected override void SaveAggregate(Aggregate aggregate, Guid transactionId)
{
//Taken from https://github.com/pgermishuys/getting-started-with-event-store/blob/master/src/GetEventStoreRepository/GetEventStoreRepository.cs
var commitHeaders = new Dictionary <string, object>
{
{ CommitIdHeader, transactionId },
{ AggregateClrTypeHeader, aggregate.GetType().AssemblyQualifiedName }
};
IList <Event> newEvents = aggregate.GetUncommittedEvents();
int originalVersion = aggregate.Version - newEvents.Count;
int expectedVersion = originalVersion; //http://stackoverflow.com/a/20204729
if (originalVersion == 0)
{
expectedVersion = ExpectedVersion.NoStream;
}
IEnumerable <EventData> eventsToSave = newEvents.Select(e => ToEventData(Guid.NewGuid(), e, commitHeaders));
string streamName = GetStreamName(aggregate.GetType(), aggregate.Id);
if (eventsToSave.Count() < WritePageSize)
{
connection.AppendToStreamAsync(streamName, ExpectedVersion.Any, eventsToSave).Wait();
}
else
{
var transaction = connection.StartTransactionAsync(streamName, expectedVersion).Result;
var position = 0;
while (position < eventsToSave.Count())
{
var pageEvents = eventsToSave.Skip(position).Take(WritePageSize);
transaction.WriteAsync(pageEvents).Wait();
position += WritePageSize;
}
transaction.CommitAsync().Wait();
}
aggregate.ClearUncommittedEvents();
}
public async Task <long> SaveAsync(Aggregate aggregate, params KeyValuePair <string, string>[] extraHeaders)
{
var streamName = aggregate.Identifier.ToString();
var uncommittedEvents = aggregate.GetUncommittedEvents();
var originalVersion = aggregate.Version - uncommittedEvents.Count;
try
{
WriteResult result;
var commitHeaders = CreateCommitHeaders(aggregate, extraHeaders);
var eventsToCommit = uncommittedEvents.Select(x => ToEventData(Guid.NewGuid(), x, commitHeaders));
var eventBatches = GetEventBatches(eventsToCommit);
if (eventBatches.Count == 1)
{
result = await _eventStoreConnection.AppendToStreamAsync(streamName, originalVersion, eventBatches[0]);
}
else
{
using (var transaction = await _eventStoreConnection.StartTransactionAsync(streamName, originalVersion))
{
foreach (var batch in eventBatches)
{
await transaction.WriteAsync(batch);
}
result = await transaction.CommitAsync();
}
}
aggregate.ClearUncommittedEvents();
return(result.NextExpectedVersion);
}
catch (Exception ex)
{
ExceptionDispatchInfo.Capture(ex).Throw();
}
return(originalVersion + 1);
}
public override void SetUp()
{
base.SetUp();
_node = new MiniNode(PathName);
_node.Start();
_firstEvent = TestEvent.NewTestEvent();
_connection = BuildConnection(_node);
_connection.ConnectAsync().Wait();
Assert.AreEqual(2, _connection.AppendToStreamAsync("test-stream",
ExpectedVersion.NoStream,
_firstEvent,
TestEvent.NewTestEvent(),
TestEvent.NewTestEvent()).Result.NextExpectedVersion);
using (var transaction = _connection.StartTransactionAsync("test-stream", 2).Result) {
Assert.AreEqual(2, transaction.CommitAsync().Result.NextExpectedVersion);
}
}
public override void SetUp()
{
base.SetUp();
_node = new MiniNode(PathName);
_node.Start();
_firstEvent = TestEvent.NewTestEvent();
_connection = TestConnection.Create(_node.TcpEndPoint);
_connection.ConnectAsync().Wait();
Assert.AreEqual(2, _connection.AppendToStreamAsync("test-stream",
ExpectedVersion.NoStream,
_firstEvent,
TestEvent.NewTestEvent(),
TestEvent.NewTestEvent()).Result.NextExpectedVersion);
using (var transaction = _connection.StartTransactionAsync("test-stream", 2).Result)
{
Assert.AreEqual(2, transaction.Commit().NextExpectedVersion);
}
}
protected async Task SaveEventBatch(string?streamId, long expectedVersion, IEnumerable <EventData> eventsToSave)
{
WriteResult writeResult;
var eventBatches = GetEventBatches(eventsToSave);
foreach (var batch in eventBatches)
{
if (batch.Length == 1)
{
writeResult = await _eventStoreConnection.AppendToStreamAsync(streamId, expectedVersion, batch.Single());
}
else
{
using var transaction = await _eventStoreConnection.StartTransactionAsync(streamId, expectedVersion);
await transaction.WriteAsync(batch);
writeResult = await transaction.CommitAsync();
}
}
}
private async Task AppendEventsInternalAsync(string streamName, long expectedVersion, ICollection <EventData> events)
{
Guard.NotNullOrEmpty(streamName);
Guard.NotNull(events);
using (Profiler.TraceMethod <GetEventStore>(nameof(AppendAsync)))
{
if (events.Count == 0)
{
return;
}
try
{
var eventsToSave = events.Select(x => Formatter.Write(x, serializer)).ToList();
if (eventsToSave.Count < WritePageSize)
{
await connection.AppendToStreamAsync(GetStreamName(streamName), expectedVersion, eventsToSave);
}
else
{
using (var transaction = await connection.StartTransactionAsync(GetStreamName(streamName), expectedVersion))
{
for (var p = 0; p < eventsToSave.Count; p += WritePageSize)
{
await transaction.WriteAsync(eventsToSave.Skip(p).Take(WritePageSize));
}
await transaction.CommitAsync();
}
}
}
catch (WrongExpectedVersionException ex)
{
throw new WrongEventVersionException(ParseVersion(ex.Message), expectedVersion);
}
}
}
public async Task Save(IAggregate aggregate, Guid commitId, Action <IDictionary <string, object> > updateHeaders)
{
var commitHeaders = new Dictionary <string, object>
{
{ CommitIdHeader, commitId },
{ CommitDateHeader, DateTime.UtcNow },
{ AggregateClrTypeHeader, aggregate.GetType().AssemblyQualifiedName }
};
updateHeaders(commitHeaders);
var streamName = aggregateIdToStreamName(aggregate.GetType(), aggregate.Id.Value);
var newEvents = aggregate.GetUncommittedEvents().Cast <object>().ToList();
var originalVersion = aggregate.Version - newEvents.Count;
var expectedVersion = originalVersion == 0 ? ExpectedVersion.NoStream : originalVersion - 1;
var eventsToSave = newEvents.Select(e => ToEventData(Guid.NewGuid(), e, commitHeaders)).ToList();
if (eventsToSave.Count < WritePageSize)
{
eventStoreConnection.AppendToStreamAsync(streamName, expectedVersion, eventsToSave).Wait();
}
else
{
var transaction = eventStoreConnection.StartTransactionAsync(streamName, expectedVersion).Result;
var position = 0;
while (position < eventsToSave.Count)
{
var pageEvents = eventsToSave.Skip(position).Take(WritePageSize);
await transaction.WriteAsync(pageEvents);
position += WritePageSize;
}
await transaction.CommitAsync();
transaction.Dispose();
}
aggregate.ClearUncommittedEvents();
}
public override async Task SetUp()
{
await base.SetUp();
_node = new MiniNode <TLogFormat, TStreamId>(PathName);
await _node.Start();
_firstEvent = TestEvent.NewTestEvent();
_connection = BuildConnection(_node);
await _connection.ConnectAsync();
Assert.AreEqual(2, (await _connection.AppendToStreamAsync("test-stream",
ExpectedVersion.NoStream,
_firstEvent,
TestEvent.NewTestEvent(),
TestEvent.NewTestEvent())).NextExpectedVersion);
using (var transaction = await _connection.StartTransactionAsync("test-stream", 2)) {
Assert.AreEqual(2, (await transaction.CommitAsync()).NextExpectedVersion);
}
}
public async Task <int> Save(IAggregate aggregate, bool concurrencyCheck = true)
{
var streamName = StreamName($"{aggregate.GetType().Name }-{aggregate.Id}");
var pendingEvents = aggregate.GetPendingEvents();
var originalVersion = concurrencyCheck ? aggregate.Version - pendingEvents.Count : ExpectedVersion.Any;
WriteResult result;
var commitHeaders = CreateCommitHeaders(aggregate);
var eventsToSave = pendingEvents.Select(x => ToEventData(Guid.NewGuid(), x, commitHeaders));
var eventBatches = GetEventBatches(eventsToSave);
if (eventBatches.Count == 1)
{
// If just one batch write them straight to the Event Store
result = await _eventStoreConnection.AppendToStreamAsync(streamName, originalVersion, eventBatches[0]);
}
else
{
// If we have more events to save than can be done in one batch according to the WritePageSize, then we need to save them in a transaction to ensure atomicity
using (var transaction = await _eventStoreConnection.StartTransactionAsync(streamName, originalVersion))
{
foreach (var batch in eventBatches)
{
await transaction.WriteAsync(batch);
}
result = await transaction.CommitAsync();
}
}
aggregate.ClearPendingEvents();
return((int)result.NextExpectedVersion);
}
private async Task SaveAndNotify(CancellationToken cancellationToken, IEvent @event)
{
var currentVersion = @event.Version - 2;
var expectedVersion = @event.Version - 1;
var t = await _connection.StartTransactionAsync(@event.Id.ToString(), expectedVersion);
try
{
await _connection.AppendToStreamAsync(@event.Id.ToString(), currentVersion,
CreateEventData(@event));
await _publisher.Publish(@event, cancellationToken);
await t.CommitAsync();
}
catch (Exception)
{
t.Rollback();
}
finally
{
t.Dispose();
}
}
public async Task Save(T aggregate)
{
var commitHeaders = new Dictionary <string, object>
{
//{CommitIdHeader, aggregate.Id},
{ AggregateClrTypeHeader, aggregate.GetType().AssemblyQualifiedName }
};
var streamName = AggregateIdToStreamName(aggregate.GetType(), aggregate.Id);
var newEvents = aggregate.GetUncommittedChanges().Cast <object>().ToList();
var originalVersion = aggregate.Version - newEvents.Count;
var expectedVersion = originalVersion < 0 ? ExpectedVersion.NoStream : originalVersion;
var preparedEvents = newEvents.Select(e => EventSerializer.Create(Guid.NewGuid(), e, commitHeaders)).ToList();
if (preparedEvents.Count < WritePageSize)
{
await _eventStoreConnection.AppendToStreamAsync(streamName, expectedVersion, preparedEvents);
}
else
{
var transaction = await _eventStoreConnection.StartTransactionAsync(streamName, expectedVersion);
var position = 0;
while (position < preparedEvents.Count)
{
var pageEvents = preparedEvents.Skip(position).Take(WritePageSize);
await transaction.WriteAsync(pageEvents);
position += WritePageSize;
}
await transaction.CommitAsync();
}
aggregate.MarkChangesAsCommitted();
}
public OngoingTransaction StartTransaction(int expectedVersion)
{
return(new OngoingTransaction(_store.StartTransactionAsync(_stream, expectedVersion).Result));
}
protected EventStoreTransaction TransStart(string streamId, string login, string password)
{
return(Connection.StartTransactionAsync(streamId, ExpectedVersion.Any,
login == null && password == null ? null : new UserCredentials(login, password))
.Result);
}
public async Task <OngoingTransaction> StartTransaction(long expectedVersion)
{
return(new OngoingTransaction(await _store.StartTransactionAsync(_stream, expectedVersion)));
}
public async Task <int> SaveAsync(AggregateBase aggregate, params KeyValuePair <string, string>[] extraHeaders)
{
var streamName = aggregate.Identifier.ToString();
if (Log.IsEnabled(LogEventLevel.Information))
{
Log.Information("Saving aggregate {streamName}", streamName);
}
var pendingEvents = aggregate.GetPendingEvents();
var originalVersion = aggregate.Version - pendingEvents.Count;
try
{
WriteResult result;
var commitHeaders = CreateCommitHeaders(aggregate, extraHeaders);
var eventsToSave = pendingEvents.Select(x => ToEventData(Guid.NewGuid(), x, commitHeaders));
if (Log.IsEnabled(LogEventLevel.Information))
{
Log.Information("{pendingEventsCount} events to write to stream {streamName}...", pendingEvents.Count, streamName);
}
if (Log.IsEnabled(LogEventLevel.Debug))
{
foreach (var evt in pendingEvents)
{
// Take the hit of serializing twice here as debug logging should only be on in exceptional circumstances
Log.Debug("Event Type: {eventType}. Payload: {payload}", evt.GetType().Name, JsonConvert.SerializeObject(evt));
}
}
var eventBatches = GetEventBatches(eventsToSave);
Debug.Assert(eventBatches.Count > 0);
if (eventBatches.Count == 1)
{
// If just one batch write them straight to the Event Store
result = await _eventStoreConnection.AppendToStreamAsync(streamName, originalVersion, eventBatches[0]);
}
else
{
// If we have more events to save than can be done in one batch according to the WritePageSize, then we need to save them in a transaction to ensure atomicity
using (var transaction = await _eventStoreConnection.StartTransactionAsync(streamName, originalVersion))
{
if (Log.IsEnabled(LogEventLevel.Information))
{
Log.Information("Started transaction {transactionId} for stream {streamName}", transaction.TransactionId, streamName);
}
foreach (var batch in eventBatches)
{
await transaction.WriteAsync(batch);
}
result = await transaction.CommitAsync();
if (Log.IsEnabled(LogEventLevel.Information))
{
Log.Information("Transaction {transactionId} committed", transaction.TransactionId);
}
}
}
aggregate.ClearPendingEvents();
if (Log.IsEnabled(LogEventLevel.Information))
{
Log.Information("Aggregate {streamName} pending events cleaned up", streamName);
}
return(result.NextExpectedVersion);
}
catch (Exception ex)
{
Log.Error($"Failed to write events for stream: {streamName}.", ex);
ExceptionDispatchInfo.Capture(ex).Throw();
}
return(originalVersion + 1);
}
private static async Task <IWrappedTransaction> CreateTransaction(IEventStoreConnection connection, string identifier, long expectedVersion)
{
var transaction = await connection.StartTransactionAsync(identifier, expectedVersion).ConfigureAwait(false);
return(new WrappedTransaction(transaction));
}