从域对象中访问Spring单例的好方法？ [英] Good way to access Spring singleton from within domain objects?

问题描述

我有一个域模型，它由相当大的对象图组成，其中域对象正在创建其他域对象，依此类推。为了各种目的，每个域对象都需要访问少量单例类型的辅助对象。

I have a domain model that consists of fairly large object graphs, where domain objects are creating other domain objects and so forth. Each of these domain objects needs access to a small handful of singleton-type helper objects for various purposes.

当我记得我已经在使用Spring时，我正准备使用Java单例模式实现它们，我可以使用Spring在应用程序中实例化这些助手中的每一个启动。

I was about to implement them using the Java singleton pattern when I remembered that I am already using Spring and I can use Spring to instantiate one of each of these helpers at application startup.

我的问题是如何从我的域对象中找到它们？这些都是通过new运算符创建的对象，不受Spring控制。

My question is how to I find them from within my domain objects? These are all objects that are created via the "new" operator and are not under the control of Spring.

我想我可以使用getBean方法我掌握了Spring应用程序上下文（我没有） - 但是这个好的表现是什么？我需要这些东西快速...以及如何快速获取应用程序上下文？

I'm thinking I could use the "getBean" method if I had my hands on the Spring application context (which I don't) -- but is the performance of this good? I need this stuff to be fast... And how to quickly get the application context?

推荐答案

public class SpringApplicationContextProvider implements ApplicationContextAware {
  public void setApplicationContext(ApplicationContext ctx)
        throws BeansException {
      // Wiring the ApplicationContext into a static method
      SpringApplicationContext.setApplicationContext(ctx);
  }
}

并将SpringApplicationContext定义为，​​

And define SpringApplicationContext as,

public class SpringApplicationContext {
   private static ApplicationContext ctx;

   public static void setApplicationContext(
        ApplicationContext applicationContext) {
      ctx = applicationContext;
   }


   public static ApplicationContext getApplicationContext() {
      return ctx;
   }

   private SpringApplicationContext(){

   }
}

在配置文件中将SpringApplicationContextProvider定义为spring bean。现在可以使用此提供程序访问应用程序上下文。

Define SpringApplicationContextProvider as a spring bean in your config file. Now the application context can be accessed using this provider.

这篇关于从域对象中访问Spring单例的好方法？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！