解讀asp.net中的觀察者模式(3)_.Net教程

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出于安全考慮，幾乎每個動態(tài)網(wǎng)站都具備IP地址屏蔽功能，而網(wǎng)上流傳的很多關于該功能的教程大都采用字符串保存和驗證IP地址，我認為這是不太科學的，我試圖找到最佳的設計方案。 “I

經(jīng)過一番思考后我還是回到我自己的Solution上，不過我又有了新的看法了。不是要將數(shù)據(jù)先緩存么？看看這個緩存，實際上她也是個觀察者，至于她執(zhí)行怎樣的緩存策略是她的事情，如是我又有了一個新類：

以下為引用的內(nèi)容：

//這里的代碼接上篇Post
using System;
using System.Collections.Generic;
using System.Text;
namespace ForyourSoft.NetTraffic.Framework
{
public sealed class DataBase
{
private IList<string> _buffer = new List<string>();
private static DataBase _instance = null;
public static void Subscribe()
{
if (_instance == null)
_instance = new DataBase(Monitor.Current);
}
public DataBase(Monitor monitor)
{
monitor.OnMessage = new EventHandler<Monitor.MessageEventArgs>(monitor_OnMessage);
}
void monitor_OnMessage(object sender, Monitor.MessageEventArgs e)
{
_buffer.Add(e.Message);
if (_buffer.Count >= Config.BufferSize)
{
//將數(shù)據(jù)添加到數(shù)據(jù)庫
}
}
}
}

PS:由于系統(tǒng)中我們只需要這樣唯一一個訂閱者，所以我將其實現(xiàn)為一個單件，在Application_Start的時候調用DataBase.Subscribe()。

現(xiàn)在系統(tǒng)是這樣的結構：

以下為引用的內(nèi)容：
[img]http://images.cnblogs.com/cnblogs_com/yuyijq/aspnetpattrern2.jpg[/img]

可以設想以后還會有更多的訂閱者。果然，昨天客戶要求在下一個版本中管理員分角色，各個角色看到的數(shù)據(jù)不同的，只有超級管理員才可以監(jiān)視所有數(shù)據(jù)，OMG，呵呵，不過還好，我只需要添加幾個訂閱者就可以輕松搞定。

后記：也許是我的文章標題沒有起好，也許很多人得到模式恐懼癥，提到模式總是要來考察一下你的case，不是那種Enterprise級別的用了pattern就是過火了。其實這篇文章的內(nèi)容里沒有一點模式的氣息，只是用.net的Event實現(xiàn)觀察者模式的思想，我想如果合適，今天模式的投資，明天你會有收獲的。

在.net里面我們有事件(event)，那就無需使用傳統(tǒng)的觀察者模式的模型了

那么我首先實現(xiàn)一個Monitor類，這個類用來接收客戶端傳遞來的數(shù)據(jù)并將數(shù)據(jù)廣播出去

以下為引用的內(nèi)容：
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
public class DataEventArgs : EventArgs
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif[/img]
[img]http://www.cnblogs.com/Images/dot.gif[/img]{
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
public string Message
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img]
[img]http://www.cnblogs.com/Images/dot.gif[/img]{get;set;}
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
public DataEventArgs(string message)
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img]
[img]http://www.cnblogs.com/Images/dot.gif[/img]{
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
this.Message = message;
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
}
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif[/img]
}
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
public class Monitor
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif[/img]
[img]http://www.cnblogs.com/Images/dot.gif[/img]{
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
public event EventHandler<DataEventArgs> DataIn;
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
private void SendData(string message)
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img]
[img]http://www.cnblogs.com/Images/dot.gif[/img]{
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
if (DataIn != null)
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img]
[img]http://www.cnblogs.com/Images/dot.gif[/img]{
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
DataEventArgs e = new DataEventArgs(message);
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
DataIn(this, e);
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
}
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
}
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img]
/**//// <summary>
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
/// 這個方法被一個HttpHandler調用，客戶端向這個Handler發(fā)送數(shù)據(jù)
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
/// 數(shù)據(jù)處理后作為字符串傳遞給該方法，該方法然后將數(shù)據(jù)廣播出去
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
/// </summary>
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
/// <param name="message">處理后的數(shù)據(jù)</param>
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
public void ReciveData(string message)
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img]
[img]http://www.cnblogs.com/Images/dot.gif[/img]{
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
SendData(message);
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
}
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif[/img]}
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]

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