Java CDI：如何使用具有多个值的限定符在运行时更改生产者？

Question

我需要根据应用程序执行的环境（开发、测试、生产等）改变JDBC连接的注入方式。新环境的添加必须易于处理。因此，考虑到佩莱格里尼对以下问题的解决方案，我试图实施这种行为：

多个CDI配置文件(devel，beta，qa，生产）在一个战争？

注射点是这样的：

@Inject 
private Connection conn;

我有两个连接工厂：

1. ConnectionFactory:用于测试、验收和生产环境；
2. ProxyConnectionFactory:仅适用于开发环境。

public inteface ConnectionFactory {
  public Connection getConnection();
}

@Environment({ "test", "acceptance", "production" })
public CustomConnectionFactory implements ConnectionFactory {
  public Connection getConnection() {
    // Implementation code
  }
}

@Environment({ "development" })
public ProxyCustomConnectionFactory implements ConnectionFactory {
  public Connection getConnection() {
    // Implementation code
  }
}

@Qualifier
@Target({ TYPE, METHOD, PARAMETER, FIELD })
@Retention(RUNTIME)
@Documented
public @interface Environment {
    String[] value() default {"production"};
}

public class ConnectionProducer {

  @Inject
  @Any
  Instance<ConnectionFacotry> connectionFactories;   

  public String getEnvironment(){
    return System.getProperty("deploy-environment");
  }

  @Produces
  public Connection produceConnection(){

    String[] profile = {getEnvironment().toLowerCase()};

    Instance<ConnectionFactory> found = connectionFactories.select(
      new EnvironmentQualifier(profile));
        if (!found.isUnsatisfied() && !found.isAmbiguous()){
          return found.get();
        }
        throw new RuntimeException("Error ...");
    }

    public static class EnvironmentQualifier 
      extends AnnotationLiteral<Environment> 
      implements Environment {      
      private String[] value;      
      public EnvironmentQualifier(String[] value) {
        this.value=value;      
      }             
      public String[] value() { return value; }
    }    

  }

如果有任何建议，我将不胜感激。

Answer 1

我建议看一下deltaspike项目阶段特性。这似乎是一个很好的基础，为您的需要。