3:04 a.m.
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:
@Retention(RetentionPolicy.RUNTIME)(a)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 {
@Overridepublic 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"); }
@HTTPMethodpublic 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