RedisAnnotationHAAspect.java

package com.qconsp.aop;

import static java.lang.System.currentTimeMillis;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
import org.springframework.stereotype.Component;

import redis.clients.jedis.Jedis;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.qconsp.cep.DaoException;

//@Aspect
//@EnableAspectJAutoProxy
//@Component
public class RedisAnnotationHAAspect {

	private Jedis jedis;

	private Gson gson;

	public RedisAnnotationHAAspect() {
		jedis = new Jedis("127.0.0.1", 1200);
		gson = new GsonBuilder().registerTypeAdapter(Class.class, new ClassTypeAdapter()).create();
	}

	@Around("execution(* com.qconsp..*.*(..)) && @annotation(redisCached)")
	private Object around(ProceedingJoinPoint pjp, final RedisCached redisCached) throws Throwable {

		String json = jedis.get(pjp.getArgs()[0].toString());

		Object o = null;
		if (json != null) {
			Envelope envelope = gson.fromJson(json, Envelope.class);

			Class type = ((MethodSignature) pjp.getSignature()).getReturnType();

			o = gson.fromJson(envelope.json, type);
			if (o != null && currentTimeMillis() <= envelope.expire) {
				System.out.println("&&& Recuperado pelo REDIS!");
				return o;
			}

		}

		try {
			o = pjp.proceed();
		} catch (DaoException e) {
			if (o != null) {
				System.out.println("&&& Recuperado pelo REDIS! Fonte não disponível!");
				return o;
			}
			throw e;
		}

		System.out.println("&&& Recuperado pelo BANCO! ");

		Envelope envelope = new Envelope(gson.toJson(o), o.getClass(), currentTimeMillis() + (redisCached.secondsToCache() * 1000));

		jedis.setex(pjp.getArgs()[0].toString(), 60 * 60 * 24 * 7, gson.toJson(envelope));

		return o;
	}

}

class Envelope {

	String json;

	Class typeOfJson;

	long expire;

	public Envelope() {
	}

	public Envelope(String json, @SuppressWarnings("rawtypes") Class typeOfJson, long expire) {
		this.json = json;
		this.typeOfJson = typeOfJson;
		this.expire = expire;
	}

}