roundrobinstrategy.java

主要考察的是资源池的设计和实现

package ServerImpl;
import java.util.*;
public class roundRobinStrategy implements Strategy {  
    Hashtable unused=null;
    ArrayList list=new ArrayList();
    public Object getObject(String id, ResourcePool pool) throws Exception{        
        Resource rs;
        Object obj;
	unused=pool.getUnused();
        Enumeration e=unused.keys();
        list.clear();
        while( e.hasMoreElements() ){
            obj = e.nextElement();   
            rs=(Resource)unused.get(obj);
            if(rs.getObjectID().equals(id)) list.add(obj);
        }
        if(list.size()==0)
            return null;
        else{
            obj=list.get(0);
            return obj;
        }
    }
}