0

我正在使用带有hibernate的struts1.3动作层。我正在通过 HeperFactory 模式访问以创建帮助程序实例来访问 DAO 层。助手工厂似乎是单例但线程安全。当我进行多次更新时，它需要很长时间。我想要实现的是有任何设计模式或机制来实现多线程助手访问。每个线程（请求）都应该有每个请求访问 dao 的单个帮助程序实例。

I have two approaches
1. Using the singleton pattern (creating a single instance of each class and sharing them among threads)...
2. creating instances of the classes in each thread as and when they are needed.

如何达到第二点？是否有任何 API 或者我应该使用池机制？第二点（数据丢失）有什么问题吗？

这是我现有的代码：

任务动作.java

公共类TaskAction{

public void udpateRecord(){
    ......
    TaskHelper taskHelper = (TaskHelper) HelperFactory
            .getHelperInstance(TaskHelper.class);
    taskHelper.updateRecord(daoObj);
    ......
}

}

HelperFactory.java

public final class HelperFactory{
 public static Object getHelperInstance(Class<?> helperClass) {
        try {
            return LookUpFactory.getLookUpFactory().lookUpClass(helperClass);
        } catch (InstantiationException e) {
            throw new RuntimeException(e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
     }
}

LookUpFactory.java

public Object lookUpClass(String lookupClass)
        throws InstantiationException, IllegalAccessException,
        ClassNotFoundException {
    if (lookupClass == null) {
        throw new IllegalArgumentException(
                "supplied lookupClass to lookup was null");
    }
    Object obj = this.objects.get(lookupClass);
    if (obj == null) {
        obj = Class.forName(lookupClass).newInstance();
        this.objects.put(lookupClass, obj);
    }
    return obj;
}
4

0 回答 0