3:19 a.m.
Thanks Stuart,
I think that's exactly what I need, since annotation as you say might not
be necessary.
Can you specify which version I would need to include in the pom please?
Since the one I am using (1.0.14.Final) doesn't seem to include it and
maven doesn't seem to know about 1.2.0.Beta1-SNAPSHOT.
Cheers
On Thu, Sep 25, 2014 at 2:00 AM, Stuart Douglas <sdouglas(a)redhat.com> wrote:
Undertow is intended to be a lightweight web server rather than a
container, so it does not really have any annotation processing facilities
built in, however it should be fairly easy to implement something similar
on top of Undertow.
Undertow has a handler called io.undertow.server.RoutingHandler, that
routes requests based on method and path. If you use this handler it should
be possible to build a handler chain based on annotations on the handler
classes.
Note that you don't want to be using reflection in the handleRequest
method, as reflection is relatively slow. Instead the best approach is to
read the annotations and boot time and build up the routing map while the
server is starting.
Stuart
Luke Ambrogio wrote:
> So I've decided to start using Undertow, both as an experiment and due
> to the great results it achieved in benchmark tests. And while I think
> it's fantastic there's a feature which is either missing or I can't
find.
>
> I want to develop a RESTful web service so it's important for me to
> identify which HTTP method is being called. Now I can get this from
> RequestMethod in the HttpServerExchange parameter but if had to that for
> every handler that would become tedious.
>
> My solution, which works but feels wrong, is this:
>
> Created an annotation interface called HTTPMethod:
>
> |(a)Retention(RetentionPolicy.RUNTIME)
> @Target(ElementType.METHOD)
> public @interface HTTPMethod {
>
> public enum Method {
>
> OTHER, GET, PUT, POST, DELETE
> }
>
> Method method() default Method.OTHER;|
>
> an "abstract" class (which is not abstract):
>
> |public abstract class RESTfulHandler implements HttpHandler {
>
> @Override
> public void handleRequest(HttpServerExchange hse) throws Exception
> {
>
> for (Method method: this.getClass().getDeclaredMethods()) {
>
> // if method is annotated with @Test
> if (method.isAnnotationPresent(HTTPMethod.class)) {
>
> Annotation annotation= method.getAnnotation(
> HTTPMethod.class);
> HTTPMethod test= (HTTPMethod) annotation;
>
>
> switch (test.method()) {
> case PUT:
> if (hse.getRequestMethod().toString().equals("PUT"))
> {
> method.invoke(this);
> }
> break;
>
> case POST:
> if
(hse.getRequestMethod().toString().equals("POST"))
> {
> method.invoke(this);
> }
> break;
>
> case GET:
> if (hse.getRequestMethod().toString().equals("GET"))
> {
> method.invoke(this);
> }
> break;
>
> case DELETE:
> if
(hse.getRequestMethod().toString().equals("DELETE"))
> {
> method.invoke(this);
> }
> break;
> case OTHER:
> if
(hse.getRequestMethod().toString().equals("OTHER"))
> {
> method.invoke(this);
> }
> break;
> }
> if (test.method() == HTTPMethod.Method.PUT) {
> method.invoke(this);
> }
> }
> }
> }|
>
> }
>
> and an implementation of both the above:
>
> |public class ItemHandler extends RESTfulHandler{
>
> @HTTPMethod(method=GET)
> public void getAllItems()
> {
> System.out.println("GET");
> }
>
> @HTTPMethod(method=POST)
> public void addItem()
> {
> System.out.println("POST");
> }
>
> @HTTPMethod
> public void doNothing()
> {
> System.out.println("OTHERS");
> }|
>
> }
>
> Now as I said, it works, but I'm sure that the abstract class and it's
> implementation have something missing so that they glue correctly. So my
> question is two fold:
>
> 1) Is there a better / proper way to filter HTTP requests in Undertow?
> 2) What is the correct way of using annotations correctly correctly in
> the above case?
>
> Thanks
>
>
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