通过缓存Cache记录命中率

 import org.apache.juli.logging.Log;

 /**
    *   通过此Cache记录命中率
  * @author Administrator
  *
  */
 public class LogCache implements Cache{
     /**记录请求次数*/
     private int requests;
     /**记录命中次数*/
     private int hits;
     private Cache cache;
     public LogCache(Cache cache) {
         this.cache=cache;
     }
     @Override
     public void putObject(Object key, Object value) {
         cache.putObject(key, value);
     }
     @Override
     public Object getObject(Object key) {
         requests++;
         Object obj=cache.getObject(key);
         if(obj!=null) {
             hits++;
         }
         System.out.println("hits:"+hits*1.0/requests);
         return obj;
     }
     @Override
     public Object removeObject(Object key) {
         return cache.removeObject(key);
     }
     @Override
     public void clear() {
         cache.clear();
     }
     @Override
     public int size() {
         // TODO Auto-generated method stub
         return cache.size();
     }
     @Override
     public String toString() {
         // TODO Auto-generated method stub
         return cache.toString();
     }
     public static void main(String[] args) {
         LogCache logCache=
         new LogCache(new PertetualCache());
         logCache.putObject("A", 100);
         logCache.putObject("B", 200);
         logCache.putObject("C", 300);
         logCache.putObject("", 300);
         logCache.getObject("D");
         logCache.getObject("A");
         logCache.getObject("B");
         System.out.println(logCache);
     }

 }