单件模式在报表中的使用
大家可能知道在复杂的并且速度较慢的报表,我们就使用先计算数据,然后再缓存起来,然后在访问报表的时候把直接读缓存就行,所以就可能有"重算" 的功能,来更新这个缓存,所以我们就要限制,在有人重算的时候,保证别人不能重算,在单一的时刻只能一个人在重算,我现在就把我刚学的代码共享出来
using System;
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namespace SigletonPattern.Sigleton
{
/**//// <summary>
/// 功能:在C#用双重锁定实现单件模式
/// 编写:jiekeng
/// 日期:2006年10月20日
/// </summary>
public class DoubLockSigleton
{
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private static volatile DoubLockSigleton instance;
/**//// <summary>
/// 辅助锁对象,本身没有意义
/// </summary>
private static object syncRoot = new Object();
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/**//// <summary>
/// 构造方法改为Private
/// </summary>
private DoubLockSigleton()
{
}
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public static DoubLockSigleton Instance
{
get
{
if (instance == null)
{
lock (syncRoot)
{
if (instance == null)
instance = new DoubLockSigleton();
return instance;
}
}
else
{
return null;
}
}
}
public static void SetInit()
{
instance = null;
}
}
}
这是核心的代码,我们现在使用客户调用,看看有
DoubLockSigleton s1 = DoubLockSigleton.Instance;
if (s1 != null)
{
Response.Write(s1.ToString());
}
else
{
Response.Write("<script language='javascript'>window.alert('已经有人在重算')</script>");
}
然后是进行类的初始化,不然的话老是"有人在重算"那可不行,好了,一个简单的模型就出来了
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然后是进行类的初始化,不然的话老是"有人在重算"那可不行,好了,一个简单的模型就出来了