APIEventLogger.java

package no.niths.aop;

import java.util.GregorianCalendar;

import no.niths.common.helpers.ValidationHelper;
import no.niths.domain.APIEvent;
import no.niths.services.interfaces.APIEventService;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
/**
 * Persists API events.
 * 
 * To persist an event,  annotate any public method with @ApiEvent(title = "title).
 * The method must be public and take one parameter.
 * 
 * Will persist an APIEvent like this:
 * Title = the title from the annotation 
 * Description = the objects toString()
 * 
 * How to use:
 * @ApiEvent(title="Something happened")
 * public void anyMethod(Object obj){}
 */
@Aspect
@Component
public class APIEventLogger {
    private static final Logger logger = LoggerFactory
            .getLogger(APIEventLogger.class);
    
    @Autowired
    private APIEventService service;
 
    /**
     * Executes after all public methods annotated with @ApiEvent
     * and persists the api event
     * 
     * @param pjp The method parameter
     * @param apiEvent The annotation
     * @throws Throwable
     */
    @After("execution(public * *(..)) && @annotation(apiEvent)")
    public void saveAPIEvent(JoinPoint pjp, ApiEvent apiEvent) throws Throwable {
        logger.debug("onAPICreateEvent() intercepted call");
        //Get the title of the apiEvent
        String title = apiEvent.title();
        if(pjp.getArgs().length >= 1){
            loggAPIEvent(title, pjp.getArgs()[0]);
        }else{
            logger.debug("Parameter list longer then 1 or is 0");
            for ( Object object : pjp.getArgs()) {
                logger.debug(object.toString());
            }    
        }
    }
    
    //Persists an api event to DB
    private void loggAPIEvent(String title, Object obj){
        logger.debug("Saving api event to db: " + title + ":" + obj.toString());

        APIEvent event = new APIEvent(title, obj + "", new GregorianCalendar());
        if(ValidationHelper.hasObjectValidAttributes(event)){
            service.create(event);            
        }else{
            logger.debug("Object did not pass validation!");
        }
    }
}