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;
var eventsToSave = newEvents.Select(e => ToEventData(Guid.NewGuid(), e, commitHeaders)).ToList();
if (eventsToSave.Count < WritePageSize)
{
_eventStoreConnection.AppendToStream(streamName, expectedVersion, eventsToSave);
}
else
{
var transaction = _eventStoreConnection.StartTransaction(streamName, expectedVersion);
var position = 0;
while (position < eventsToSave.Count)
{
var pageEvents = eventsToSave.Skip(position).Take(WritePageSize);
transaction.Write(pageEvents);
position += WritePageSize;
}
transaction.Commit();
}
aggregate.ClearUncommittedEvents();
}
public void should_commit_when_writing_with_exp_ver_any_even_while_somene_is_writing_in_parallel()
{
const string stream = "should_commit_when_writing_with_exp_ver_any_even_while_somene_is_writing_in_parallel";
var transWritesCompleted = new AutoResetEvent(false);
var writesToSameStreamCompleted = new AutoResetEvent(false);
var totalTranWrites = 500;
var totalPlainWrites = 500;
//excplicitly creating stream
using (var store = new EventStoreConnection(MiniNode.Instance.TcpEndPoint))
store.CreateStream(stream, new byte[0]);
//500 events during transaction
ThreadPool.QueueUserWorkItem(_ =>
{
using (var store = new EventStoreConnection(MiniNode.Instance.TcpEndPoint))
{
var transaction = store.StartTransaction(stream, ExpectedVersion.Any);
var writes = new List <Task>();
for (int i = 0; i < totalTranWrites; i++)
{
if (i % 10 == 0)
{
writes.RemoveAll(write => write.IsCompleted);
}
writes.Add(store.TransactionalWriteAsync(transaction.TransactionId,
transaction.Stream,
new[] { new TestEvent((i + 1).ToString(), "trans write") }));
}
Task.WaitAll(writes.ToArray());
store.CommitTransaction(transaction.TransactionId, transaction.Stream);
transWritesCompleted.Set();
}
});
//500 events to same stream in parallel
ThreadPool.QueueUserWorkItem(_ =>
{
using (var store = new EventStoreConnection(MiniNode.Instance.TcpEndPoint))
{
var writes = new List <Task>();
for (int i = 0; i < totalPlainWrites; i++)
{
if (i % 10 == 0)
{
writes.RemoveAll(write => write.IsCompleted);
}
writes.Add(store.AppendToStreamAsync(stream,
ExpectedVersion.Any,
new[] { new TestEvent((i + 1).ToString(), "plain write") }));
}
Task.WaitAll(writes.ToArray());
writesToSameStreamCompleted.Set();
}
});
transWritesCompleted.WaitOne();
writesToSameStreamCompleted.WaitOne();
//check all written
using (var store = new EventStoreConnection(MiniNode.Instance.TcpEndPoint))
{
var slice = store.ReadEventStreamForward(stream, 0, totalTranWrites + totalPlainWrites + 1);
Assert.That(slice.Events.Length, Is.EqualTo(totalTranWrites + totalPlainWrites + 1));
Assert.That(slice.Events.Count(ent => Encoding.UTF8.GetString(ent.Metadata) == "trans write"), Is.EqualTo(totalTranWrites));
Assert.That(slice.Events.Count(ent => Encoding.UTF8.GetString(ent.Metadata) == "plain write"), Is.EqualTo(totalPlainWrites));
}
}