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13.9.2. Bind an Interceptor to a JAX-RS Method

Summary

All registered interceptors are invoked for every request by default. The AcceptedByMethod interface can be implemented to fine tune this behavior.

Example 13.7. Binding Interceptors Example

RESTEasy will call the accept() method for interceptors that implement the AcceptedByMethod interface. If the method returns true, the interceptor will be added to the JAX-RS method's call chain; otherwise it will be ignored for that method.
In the example below, accept() determines if the @GET annotation is present on the JAX-RS method. If it is, the interceptor will be applied to the method's call chain. 
@Provider
@ServerInterceptor
public class MyHeaderDecorator implements MessageBodyWriterInterceptor, AcceptedByMethod {

    public boolean accept(Class declaring, Method method) {
       return method.isAnnotationPresent(GET.class);
    }

   public void write(MessageBodyWriterContext context) throws IOException, WebApplicationException
   {
      context.getHeaders().add("My-Header", "custom");
      context.proceed();
   }
}
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