promotabletransaction.cs

该文件是多层体系结构的数据访问层

#region Copyright & License
//
// $Copyright:$
//
#endregion
#region Document Information
// $Author: Bai.shijun $
// $Rev: $ 
// $Date: 05-10-08 16:13 $
#endregion

using System;
using System.Transactions;
using System.Diagnostics;

namespace Eai.Data.Transaction
{
    /// <summary>
    /// Use promotable transaction in .Net Framework 2.0
    /// </summary>
    public class PromotableTransaction : MixTransactionBase, IDisposable
    {
        private TransactionScope transScope;
        public PromotableTransaction()
        {
        }

        #region IMixTransation Members

        public override void Begin()
        {
            transScope = new TransactionScope();
        }

        public override void Rollback()
        {
            DataAccessors.Close();
            transScope.Dispose();
            transScope = null;
        }

        public override void Commit()
        {
            DataAccessors.Flush();
            DataAccessors.Close();
            try
            {
                transScope.Complete();
            }
            finally
            {
                transScope.Dispose();
            }
            transScope = null;
        }

        public override bool SupportParallelTransactin
        {
            get { return true; }
        }

        public override void AttachDataAccessor(string name, IDataAccessor dataAccessor)
        {
            DataAccessors.Add(name, dataAccessor);
        }

        #endregion

        #region IDisposable Members

        public void Dispose()
        {
            if (TransactionStarted) Rollback();
        }

        #endregion

        private bool TransactionStarted
        {
            get { return transScope != null; }
        }
   }
}