public interface CachedLoadService { Map loadHomeData(); } public class CachedUtils { private static Date lastSearchTime=null; private static Map mapMediaList=null; static Object lock = new Object(); public static Map getMediaList() { synchronized (lock) { CachedLoadService cachedLoadService=(CachedLoadService) SpringContextUtil.getBean("cachedLoadService"); //或者其它业务类 try { if(lastSearchTime==null) { mapMediaList=cachedLoadService.loadHomeData(); lastSearchTime=new Date(); } else { if(mapMediaList==null) { mapMediaList=cachedLoadService.loadHomeData(); lastSearchTime=new Date(); } else { mapMediaList=cachedLoadService.loadHomeData(); lastSearchTime=new Date(); } } return mapMediaList; } catch (Exception e) { return mapMediaList; } } }

}

cachedLoadService.loadHomeData() 就是一个 final static Map ,还有必要去特意弄一个接口吗?这种做法的作用是什么?