java - 使用 @RequestScoped bean 将 header 值从 Web 层传递到 EJB？

Question

我应该将来自请求的 HTTP header 附带的一些信息传递给 EJB，但我不想添加参数并将它们传递到我需要的任何地方。所以我使用 RequestScoped bean 来保存我的 header 值。这个实现可以吗，还是我误解了 @RecuestScoped beans 的概念？

首先，我使用拦截器 (Resteasy) 获取 header ，并将它们保存到我的请求范围 bean 中:

@Provider
@ServerInterceptor
public class SomeInterceptor implements PreProcessInterceptor {

    @Inject
    ApplicationRequestContext appContext;

    @Override
    public ServerResponse preProcess(HttpRequest request, ResourceMethod resourceMethod)
            throws Failure, WebApplicationException {
        List<String> values = request.getHttpHeaders().getRequestHeader("Some-Header");
        if(values != null && values.size() > 0) {
            appContext.setSomeHeader(values.get(0));
        }
        return null;
    }
}

这是 bean :

@RequestScoped
public class ApplicationRequestContext implements Serializable {
    private String someHeader;

    public void setSomeHeader(String someHeader) {
        this.someHeader = someHeader;
    }

    public String getSomeHeader() {
        return someHeader;
    }
}

然后我可以从我的 EJB 访问该值(每个请求都不同):

@Stateless
public class CheckInWorkflow {

    @Inject
    ApplicationRequestContext appContext;

    public void someEjbMethod() {
        doSomethingWithThisHeaderValue(appContext.getSomeHeader());
    }
}

基于@RequestScoped的描述这应该按预期工作:

The request scope is active:

• during the service() method of any servlet in the web application, during the doFilter() method of any servlet filter and when the container calls any ServletRequestListener or AsyncListener,
• during any Java EE web service invocation,
• during any remote method invocation of any EJB, during any asynchronous method invocation of any EJB, during any call to an EJB timeout method and
• during message delivery to any EJB message-driven bean, and during any message delivery to a MessageListener for a JMS topic or queue obtained from the Java EE component environment.

Answer 1

实现是正确的，但似乎是使用副作用进行了不必要的优化。