最近在做一个轻量级CMS供客户站点使用。
根据客户的需求,需要以静态页方式提供用户浏览的页面,同时还要保留一个本份,支持“双远程”发布,即在一台远程发布服务器上保留存根,最终页面保存在文件服务器上供用户访问。
研究了半天,发现可以用策略模式和职责链模式相结合来实现这个处理逻辑(我估且称此为策略链模式)。
以下是策略链的根接口,其他接口从这上面继承:
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namespace strategyChain
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{
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public interface IStrategy<T>
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{
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T Next{get;}
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}
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}
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处理新闻的接口:
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namespace strategyChain
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{
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public class News
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{}
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public interface INewsStrategy : IStrategy<INewsStrategy>
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{
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void DoSomething(News news);
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}
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}
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然后写一个抽象类来实现该接口:NewsStrategy
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为了满足顾客的要求,写了三个类来继承NewsStrategy: LocalNewsStrategy,RemoteNewsStrategy,SqlNewsStrategy
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namespace strategyChain
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{
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public class LocalNewsStrategy : NewsStrategy
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{
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public LocalNewsStrate(INewsStrategy next) : base(next){}
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public override void Dosomething(News news)
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{
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localDo(news);
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base.DoSomething(news);
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}
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}
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private void localDo(News news)
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{
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//todo:本地操作逻辑
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}
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}
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namespace strategyChain
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{
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public class RemoteNewsStrategy : NewsStrategy
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{
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public RemoteNewsStrategy(INewsStrategy next)
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:base(next){
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}
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public override void DoSomething(News news)
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{
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remoteDo(news)
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base.DoSomething(news);
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}
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private void remoteDo(News news)
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{
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//执行远程逻辑
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}
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}
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}
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namespace strategyChain.SqlClient
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{
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public class SqlNewsStrategy : NewsStrategy
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{
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public SqlNewsStrategy(INewsStrategy next):base(next){}
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public override void DoSomething(News news)
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{
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sqlDo(news);
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base.DoSomething(news);
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}
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private void sqlDo(News news)
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{
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//执行数据库逻辑
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}
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}
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}
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把这个写完了以后,创建一个NewsProvider类,来根据用户定义配置稿件的操作逻辑,配置完以后应用程序利用工厂方法,在运行时得到一个NewsProvider,来执行策略链。工厂方法在这里就不写了,写一个NewsProvider的实现。
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写完了这个抽象类以后,再在最后一个结点处继承该抽象类:
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namespace strategyChain.SqlClient
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{
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public class SqlNewsProvider : NewsProvider
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{
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//这个类只要将sqlNewsStrategy加入到策略链就行了,其他的什么都不用做.
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public SqlNewsProvider()
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{
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strategy = new SqlNewsStrategy(strategy);
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}
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}
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}
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最后只需要在配置文件中指定 NewsProvider = "SqlNewsProvider"即可,真正的运行时代码将是
News news = null;
//实现news
NewsProvider provider = NewsFactory.GetNewsProvider();
provider.DoSomething(news);