稳定一致性不易变形

//## Project  : ETMASS——Extensible Multi-Thread Asynchronous Socket Server Framework
//## Author   : Hulihui(ehulh@163.com)
//## Creation Date : 2008-10-13
//## Modified Date : 2008-11-09

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Threading;
using System.Data;
using System.Data.Common;
using System.Data.SqlClient;
using System.Data.OleDb;

namespace CSUST.Net
{

    #region 定义相关枚举变量
    public enum TDisconnectType
    {
        Normal,     // disconnect normally
        Timeout,    // disconnect because of timeout
        Exception   // disconnect because of exception
    }

    public enum TSessionState
    {
        Active,    // state is active
        Inactive,  // session is inactive and will be closed
        Shutdown,  // session is shutdownling
        Closed     // session is closed
    }
    #endregion

    #region 会话类核心成员对象实体
    /// <summary>
    /// 会话类核心成员对象实体
    /// </summary>
    public class TSessionCoreInfo
    {
        
    }
    #endregion

    #region 异常类接口
    public class TExceptionEventArgs : EventArgs
    {
        
    }

    public class TSessionEventArgs : EventArgs
    {
       
    }

    public class TSessionExceptionEventArgs : TSessionEventArgs
    {
       
    }

    /// <summary>
    /// 异常委托接口
    /// </summary>
    public interface ISessionEvent
    {
        event EventHandler<TSessionExceptionEventArgs> SessionReceiveException;
        event EventHandler<TSessionExceptionEventArgs> SessionSendException;
        event EventHandler<TSessionEventArgs> DatagramDelimiterError;
        event EventHandler<TSessionEventArgs> DatagramOversizeError;
        event EventHandler<TSessionEventArgs> DatagramAccepted;
        event EventHandler<TSessionEventArgs> DatagramError;
        event EventHandler<TSessionEventArgs> DatagramHandled;
    }
    #endregion

    #region 会话基类，对外访问的类,继承于TSessionCoreInfo，ISessionEvent
    /// <summary>
    /// 会话基类(抽象类, 必须实现其 AnalyzeDatagram 方法)
    /// </summary>
    public abstract class TSessionBase: TSessionCoreInfo, ISessionEvent
    {
      
    }
    #endregion

    

    #region 数据库操作相关类
    /// <summary>
    /// 定义数据库异常委托
    /// </summary>
    public interface IDatabaseEvent
    {
        event EventHandler<TExceptionEventArgs> DatabaseOpenException;
        event EventHandler<TExceptionEventArgs> DatabaseException;
        event EventHandler<TExceptionEventArgs> DatabaseCloseException;
    }

    /// <summary>
    /// 数据库抽象基类, 只给出了几个抽象方法, 派生后需要增加实现
    /// 1) Open方法, 给出具体的SqlConnection/OleDbConnection
    /// 2) 其它抽象方法, 这些实现要在 TSocketServerBase 中调用
    /// 3) 已经给出了两个派生类：TSqlServerBase/TOleDatabaseBase
    /// </summary>
    public abstract class TDatabaseBase: IDatabaseEvent
    {
       ..........
    }

    /// <summary>
    /// SqlServer数据库类, 可以再派生并增加属性与字段
    /// </summary>
    public class TSqlServerBase : TDatabaseBase
    {
       ...............
    }

    /// <summary>
    /// OldDb数据库类, 可以再派生并增加属性与字段
    /// </summary>
    public class TOleDatabaseBase : TDatabaseBase
    {
       ..........
    }
    #endregion

 //主要说明这里调用比较底层的类型如抽象类，接口，而不调用子类,因为调用抽象类或接口使得这个类比较稳定一致性不易变形,
 //因为不会随着子类的变化而变化,通过抽象或接口来到达统一

    public class TSocketServerBase<TSession, TDatabase> : IDisposable, IDatabaseEvent, ISessionEvent
        where TSession : TSessionBase, new()
        where TDatabase : TDatabaseBase, new()
    {
       ..........
    }
}