private static bool TryReceiveCore(ServiceBrokerMessageHandler handler, SqlCommand cmd) {
SqlDataReader reader = null;
var result = false;
var conversationQueries = new List<Tuple<string, Action<SqlParameterCollection>>>();
try {
cmd.Connection.Open();
cmd.Transaction = cmd.Connection.BeginTransaction();
reader = cmd.ExecuteReader(CommandBehavior.SingleRow | CommandBehavior.SequentialAccess);
if (reader.Read()) {
var conversation =
new ServiceBrokerConversation((query, setup) => conversationQueries.Add(Tuple.Create(query, setup)),
reader.GetGuid(0));
handler(conversation, new ServiceBrokerMessageType(reader.GetString(1)), reader.GetStream(2));
result = true;
}
reader.Close();
foreach (var item in conversationQueries) {
cmd.Parameters.Clear();
cmd.CommandText = item.Item1;
item.Item2(cmd.Parameters);
cmd.ExecuteNonQuery();
}
cmd.Transaction?.Commit();
return result;
} catch {
reader?.Close();
cmd.Transaction?.Rollback();
throw;
} finally {
reader?.Dispose();
cmd.Transaction?.Dispose();
cmd.Connection.Dispose();
cmd.Dispose();
}
}
public bool TryReceive(ServiceBrokerConversation sourceConversation, ServiceBrokerMessageHandler handler, TimeSpan timeout) {
var cmd = db.NewCommand(receive);
cmd.Parameters.AddWithValue("@timeout", (int)timeout.TotalMilliseconds);
cmd.Parameters.AddWithValue("@conversation", sourceConversation.Handle);
return TryReceiveCore(handler, cmd);
}
