Guice

Question

我的目的是为我的 Cucumber Guice 单元测试生成 EntityManager 和 Logger SFL4J 实现。

我创建了以下资源生产者

public class MockResourcesWeb {

    private static final Logger logger = LoggerFactory.getLogger(MockResourcesWeb.class);

    private EntityManager entityManager;

    @PostConstruct
    void init() {
        try {
            entityManager = Persistence.createEntityManagerFactory("h2-test").createEntityManager();
        } catch (Exception e) {
            logger.warn("Failed to initialize persistence unit", e);
        }
    }

    @Produces
    public EntityManager getEntityManager(InjectionPoint injectionPoint) {
        return entityManager;
    }

    @Produces
    public Logger produceLog(InjectionPoint injectionPoint) {
        return LoggerFactory.getLogger(injectionPoint.getMember().getDeclaringClass().getName());
    }

}

现在我想我应该使用 AbstractModule 的实现来绑定那些 classes，所以： public class ServiceModule 扩展 AbstractModule { @覆盖受保护的无效配置（）{ 绑定（EntityManager.class）.to（？）； // ...（进一步绑定） } }

我不知道如何实现这一点。我也试过明确它：

bind( EntityManager.class ).to(Persistence.createEntityManagerFactory("h2-test").createEntityManager());

但是还是编译失败

有什么建议吗？

Answer 1

My purpose is to produce EntityManager and Logger SFL4J implementations for my cucumber guice unit tests.

使用 guice 注入获得 EntityManager 和 SFL4J 的实例

你可以使用cucumber-guice如下

  <dependency>
            <groupId>io.cucumber</groupId>
            <artifactId>cucumber-guice</artifactId>
            <version>6.4.0</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.google.inject</groupId>
            <artifactId>guice</artifactId>
            <version>4.2.3</version>
            <scope>test</scope>
        </dependency>

然后在 Global class

import com.google.inject.Singleton;
import io.cucumber.guice.ScenarioScoped;

// Scenario scoped it is used to show Guice
// what will be the shared classes/variables and instantiate them only in here
@ScenarioScoped
//@Singleton
public class Global {
 
   public EntityManager  entityManager = new EntityManager();
}

创建一个BasePage class并在构造函数中传递Global

//import classes   
public class BasePage {

    protected Global global;

    public BasePage(Global global) {
        this.global = global;
    }
}

现在在你的步骤定义中（单元测试或其他黄瓜测试）

  import com.google.inject.Inject;
  //import other classes as necessary

public class StepDefs extends BasePage {
    
         public static EntityManager entityMgr; 
    
        @Inject
        public StepDefs(Global global) {
            super(global);
            StepDefs.entityMgr = global.entityManager
        }
     //use entityMgr as needed

     //note that a new instance of entityMgr will be created for each scenario in feature file`
     // to create an instance that will last for all tests use @singleton in Global class . ex : for sfl4j
  }

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Guice - 来自资源生产者的绑定 类

Guice - Binding classes from resource producer

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Guice - 来自资源生产者的绑定类