我可以使用EJB 3.0制作自己的Singleton Stateless Bean吗? [英] Can i make my own Singleton Stateless Bean with EJB 3.0?

问题描述

现在，在EJB 3.1中，我们可以找到javax.ejb.Singleton注释，它可以确保此bean将成为单例.

Now, with EJB 3.1, we can find the javax.ejb.Singleton annocation that can ensure that this bean is going to be singleton.

有没有一种方法可以确保我在EJB 3.0中使用无状态bean并在我的代码中进行一些修改(使用关键字static或其他方式实现此目的...)

Is there a way that i can ensure singleton using stateless beans in EJB 3.0 with some modifications in my code (use of the keyword static, or other way to do that....)

推荐答案

如果您可以将@Stateless bean池的大小限制为正好1，那么您可以非常接近@Singleton.

If you're able to limit your @Stateless bean pool size to exactly 1, then you can get pretty close to an @Singleton.

效果就像有一个@Singleton，它使用@Lock(WRITE)进行所有调用(即不并发)，并且不急于通过@Startup启动(它将首先启动访问).

The effect would be like having an @Singleton that uses @Lock(WRITE) for all calls (i.e. no concurrency) and does not eagerly startup via @Startup (it will start on first access).

如果您的平台可以选择紧急填充@Stateless豆池，那么您仍然可以得到@Startup的效果.

You might still be able to get the effect of @Startup if your platform has the option to eagerly fill @Stateless bean pools.

这篇关于我可以使用EJB 3.0制作自己的Singleton Stateless Bean吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！