假设我定义了以下服务接口（以及实现）：

interface Service1 { /* Methods omitted for brevity */ }
interface Service2 { /* Methods omitted for brevity */ }

我还有一个无法修改的接口（我无法控制）：

interface YouAreNotAllowedToModifyMe {
  Object createSomething();
}

进一步假设我有一个实现 YouAreNotAllowedToModifyMe 接口并接受这些服务的实现以及当前 HttpServletRequest . 请注意，请求是一个实现细节，而不是接口的一部分。

class Demo implements YouAreNotAllowedToModifyMe {

  private final HttpServletRequest request;
  private final Service1 service1;
  private final Service2 service2;

  @Inject
  public Demo(HttpServletRequest request, Service1 service1, Service2 service2) {
    this.request = request;
    this.service1 = service1;
    this.service2 = service2;
  }

  public Object createSomething() {
    // Use the request, service1, and service2 in order to create the object.
  }
}
``` `Demo` 在运行时之前无法示例化，因为它需要当前 `HttpServletRequest` ，但是我希望cdi injection负责注入其他参数。我该怎么做？
基本上，我希望这是可能的（不是）：

class Foo {

@Inject
private final Instance demoInstance;

public void doSomething(HttpServletRequest request) {

// This is pretend. This won't really work, though I wish it would.
// Essentially, I pass in the request and CDI takes care of everything else.
Demo demo = demoInstance.get(request);

}
}