Event and response entity

Events receive the response entity as it is produced by the REST API.
Event can use this data as input parameters.

@GET
@Path("/register/{email}")
@RestEvent(description = "Send welcome email",
	processor = SendWelcomeMail.class, 
	response = 200
)
@Produces(MediaType.APPLICATION_JSON)
public Response setStatus(@PathParam("email") String email) {

// do some registration
	return Response.ok(email).status(code).build();
}

NOTE: the entity object must implement the Serializable interface

public class SendWelcomeMail implements RestEventProcessor {

    @Override
    public RestEventResult execute(Serializable entity, RestEventContext context) throws Exception {
	    if (entity instanceof String) { // check entity type
    		String email = (String)entity; // get entity as provided
	    	sendWelcomeMailTo(email); // use entity to perform some action
	    }
	    return RestEventResult.ok();
    }
}