自定义注解解耦reids缓存使用
package test.cache; import org.aspectj.lang.JoinPoint; import org.aspectj.lang.ProceedingJoinPoint; import org.aspectj.lang.annotation.Around; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.aspectj.lang.annotation.Pointcut; import org.aspectj.lang.reflect.MethodSignature; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.autoconfigure.session.SessionProperties; import org.springframework.core.DefaultParameterNameDiscoverer; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.stereotype.Component; import redis.RedisUtils; import redis.clients.jedis.Jedis; import java.lang.annotation.Annotation; import java.lang.reflect.Method; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.locks.Lock; @Aspect @Component public class TestCacheAop { ConcurrentHashMap<String,String> lock = new ConcurrentHashMap(); @Autowired RedisTemplate redisTemplate; @Pointcut(value="execution(public * test*.*.*.*(..))&&@annotation(TestCache)") public void cachePointcut() { } @Around("cachePointcut()") public Object around (ProceedingJoinPoint joinPoint) throws NoSuchMethodException { //Annotation annotation = joinPoint.getTarget().getClass().getAnnotation(TestCache.class); TestCache testCache = ((MethodSignature)joinPoint.getSignature()).getMethod().getAnnotation(TestCache.class); if(testCache == null) { return null; } String key = testCache.value(); if(key==null) { return null; } MethodSignature methodSignature =(MethodSignature) joinPoint.getSignature(); Method method = joinPoint.getTarget().getClass().getMethod(methodSignature.getName(),methodSignature.getMethod().getParameterTypes()); //java编译后的方法参数默认是不会显示参数名称的需要转换 DefaultParameterNameDiscoverer discoverer = new DefaultParameterNameDiscoverer(); String[] parameters = discoverer.getParameterNames(method); String cacheKey = key; for(int i=0;i<parameters.length;i++) { if(parameters[i].equals(key)) { cacheKey = String.valueOf(joinPoint.getArgs()[i]); break; } } Object value = redisTemplate.opsForValue().get(cacheKey); if(value!=null) { return value; } //防止缓存雪崩 String cacheFlag = lock.putIfAbsent(cacheKey,"true"); Object obj = null; if(cacheFlag == null) { try { obj = joinPoint.proceed(); redisTemplate.opsForValue().set(cacheKey,obj); } catch(Throwable throwable) { throwable.printStackTrace(); } return obj; }else { return "当前系统忙"; } } }