Question

我遇到CDI条件问题注入在EJB注入中使用一种策略。

我的实际情况是：

public class someManagedBean {

    @Inject 
    @MyOwnQualifier(condition = someBean.getSomeCondition()) // not work because someBean is not already injected at this point
    private BeanInterface myEJB;

    @Inject
    SomeBean someBean;
}

@Qualifier
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD, ElementType.METHOD})
public @interface MyOwnQualifier {
    SomeCondition condition();
}

public class BeanInterfaceFactory {
    @Produces
    @MyOwnQualifier(condition = RoleCondition.ADMIN) 
    public BeanInterface getBeanInterfaceEJBImpl() {
        return new BeanInterfaceEJBImpl();
    }
}

public enum RoleCondition {
    ADMIN("ADMIN User");
}

好的，情景解释。现在的问题是我需要获得价值来自someBean.getSomeCondition()的{{1}}，我RoleCondition需要@MyOwnQualifier。但此时有些人还没有被CDI注射过。

如何让这条线路起作用？

@Inject 
@MyOwnQualifier(condition = someBean.getSomeCondition()) // not work because some is not already injected at this point
private BeanInterface myEJB;

如何使用基于另一个注入属性值的限定符来动态注入bean？

Answer 1

试试这个......

public class someManagedBean {

    @Inject 
    @MyOwnQualifier
    private BeanInterface myEJB;
}

@Qualifier
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD, ElementType.METHOD})
public @interface MyOwnQualifier {
    SomeCondition condition();
}

public class BeanInterfaceFactory {

    @Inject
    SomeBean someBean

    @Produces
    @MyOwnQualifier
    public BeanInterface getBeanInterfaceEJBImpl() {
        if(someBean.getCondition()) {         
            return new BeanInterfaceEJBImpl();
        } else {
           ....
        }
    }
}

public enum RoleCondition {
    ADMIN("ADMIN User");
}

使用基于@Inject字段CDI的@Qualifier

1 个答案: