public async Task Save(Guid aggregateId, ImmutableList<Event> events, int expectedVersion)
{
using (var session = _writeConnectionFactory.Connect())
{
// TODO: use something different than a integer for the version
var lastVersion = await GetLastVersion(session, aggregateId);
if (expectedVersion != -1 && lastVersion != expectedVersion)
{
throw new ConcurrencyException();
}
var insert =
await session.PrepareAsync("INSERT INTO event (id, version, type, payload) VALUES (?, ?, ?, ?)");
var batch = new BatchStatement();
var increasingVersion = lastVersion;
foreach (var evt in events)
{
batch.Add(insert.Bind(
aggregateId,
++increasingVersion,
evt.GetType().AssemblyQualifiedName,
_serializer.Serialize(evt)));
}
await session.ExecuteAsync(batch);
}
}
public void Up()
{
using (var session = _writeConnectionFactory.Connect())
{
var dropStatement = session.Prepare("DROP TABLE IF EXISTS event");
session.Execute(dropStatement.Bind());
var statement =
session.Prepare(
"CREATE TABLE event (id UUID, version INT, type TEXT, payload TEXT, PRIMARY KEY (id, version)) WITH CLUSTERING ORDER BY (version ASC)");
session.Execute(statement.Bind());
}
}