Registering a custom ResourceMethodInvocationHandler in Jersey - jersey

Question

I am attempting to intercept a resource call after it's JSON has been unmarshalled. Reading through some forums and posts I discovered that I may be able to do so by implementing org.glassfish.jersey.server.spi.internal.ResourceMethodInvocationHandlerProvider. Having done so I am now stuck trying to get my CustomResourceMethodInvocationHandler provider registered so that the jersey/hk2 internals call my overridden public InvocationHandler create(Invocable invocable) method. Any help would be much appreciated!

Answer 1

Let's have a look at this approach:
(Tested with Jersey 2.10 and JSON serialization)
==============
1) Implement a custom ResourceMethodInvocationHandlerProvider
package com.example.handler;
import java.lang.reflect.InvocationHandler;
import org.glassfish.jersey.server.model.Invocable;
import org.glassfish.jersey.server.spi.internal.ResourceMethodInvocationHandlerProvider;
public class CustomResourceInvocationHandlerProvider implements
ResourceMethodInvocationHandlerProvider {
#Override
public InvocationHandler create(Invocable resourceMethod) {
return new MyIncovationHandler();
}
}
2) Implement a custom InvocationHandler
package com.example.handler;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
public class MyIncovationHandler implements InvocationHandler {
#Override
public Object invoke(Object obj, Method method, Object[] args)
throws Throwable {
// optionally add some logic here
Object result = method.invoke(obj, args);
return result;
}
}
3) Create a custom Binder class and register your CustomResourceInvocationHandlerProvider
package com.example.handler;
import org.glassfish.hk2.utilities.binding.AbstractBinder;
import org.glassfish.jersey.server.spi.internal.ResourceMethodInvocationHandlerProvider;
public class CustomBinder extends AbstractBinder {
#Override
protected void configure() {
// this is where the magic happens!
bind(CustomResourceInvocationHandlerProvider.class).to(
ResourceMethodInvocationHandlerProvider.class);
}
}
4) Optionally: Set breakpoint in ResourceMethodInvocationHandlerFactory
Just to understand how the selection of ResourceMethodInvocationHandlerProvider in org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory works.
==============
As you can see, the most important thing is to bind your CustomResourceInvocationHandlerProvider.class to the ResourceMethodInvocationHandlerProvider.class. After doing this, HK2 knows about your Provider and also about your Handler!
Hope, I could help.