将Guice组件集成到Spring应用程序中 [英] Integrate Guice component into Spring application

问题描述

我们有一个基于Spring框架的应用程序，需要集成使用Google Guice构建的组件.

We have a Spring framework based application and need to integrate a component that is built using Google Guice.

有人可以给我们一些建议吗?

Can anybody give us some advice on how this can be done?

我们遇到了以下链接，这些链接显示了如何将Spring集成到Guice中，但反之则需要它:

We came across the following links that show how integrate Spring into Guice, but we need it the other way around:

http://google-guice.googlecode.com/git/javadoc/com/google/inject/spring/SpringIntegration.html

http://www.jroller.com/mindcrime/entry/an_example_of_integrating_guice

感谢您的帮助

推荐答案

无需特殊框架或依赖项即可将guice组件集成到spring-boot.

No Special framework or dependency is required to integrate guice component into spring-boot.

标准启动应用

    @SpringBootApplication
    public class App {
       SpringApplication.run(App.class, appArgs);
    }

指导模块配置

  @Configuration
  public class GuiceBeanConfig {

    private final Injector injector;

    // guice modules are initialized before the spring context completes 
    {
        injector = Guice.createInjector(
                new MyModuleA(),
                new MyModuleB()
        );
    }

    /**
     * Option1: can expose injector as a Spring Bean.
     */
    @Bean
    public Injector injector() {
        return injector;
    }


    /**
     * Option2: expose specific component as a Spring Bean.
     */
    @Bean
    public MyServiceA serviceA() {
        return injector.getInstance(ServiceA.class);
    }
}

作为常规spring bean自动连接到服务组件中.

• 选项1:自动连接guice注入器并从中访问任何

• Option1: autowire guice injector and access any bean from it

 @Service
 public class MySpringService {

    private final ServiceA serviceA;  

    MySpringService (Injector i){
       serviceA = injector.getInstance(ServiceA.class)
    }

    public void callServiceA() {
        serviceA.doSomething();
    }

  }

选项2:自动连线特定的豆子

Option2: autowire specific bean

@Service
public class MySpringService {

  private final ServiceA serviceA; 

  MySpringService (ServiceA s){
      serviceA = s;
  }

  public void callServiceA() {
      serviceA.doSomething();
  }

}

注意1: 默认情况下，Spring使用范围: Singleton 和guice: Prototype . 如果您的guice组件未注释为 @Singleton :
每次创建MySpringService的新实例时， Option1 都会创建ServiceA的实例.
相反， Option2 将ServiceA公开为具有作用域Singleton的bean.

NOTE 1: By default Spring uses scope: Singleton and guice: Prototype. In case your guice component is not annotated as @Singleton :
Option1 creates an instance of ServiceA each time you create a new instance of MySpringService.
Option2 instead exposes ServiceA as a bean with scope Singleton.

Singleton与原型:如果组件/服务是线程安全的，则不保持状态，因此更好的选择是Singleton.更好的性能，更少的GC工作.

Singleton vs Prototype: if you component/service is threadsafe, does not keep state the better option would be Singleton. Much better performance, less work for GC.

注意2: 如果进行构造函数注入，Spring-boot不需要使用@Autowire注释.

NOTE 2: Spring-boot does not require to use @Autowire annotation in case you do constructor injection.

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