Java高性能缓存框架之Caffeine详解

<dependency>
            <groupId>com.github.ben-manes.caffeine</groupId>
            <artifactId>caffeine</artifactId>
            <version>2.6.2</version>
        </dependency>

/**
 * @Author ZhuZiKai
 * @Description
 * @date 2022/3/7 10:44
 */
public abstract class AbstractCaffeineCache<T> {
    protected LoadingCache<String, T> loadingCache;
    abstract LoadingCache<String, T> createLoadingCache();
    public boolean put(String key, T value) {
        if (loadingCache == null) {
            loadingCache = createLoadingCache();
        }
        loadingCache.put(key, value);
        return Boolean.TRUE;
    }
    public T get(String key) {
        if (loadingCache == null) {
            loadingCache = createLoadingCache();
        }
        try {
            return loadingCache.get(key);
        } catch (Exception e) {
            return null;
        }
    }
    public boolean clear(String key) {
        if (loadingCache == null) {
            loadingCache = createLoadingCache();
        }
        loadingCache.invalidate(key);
        return Boolean.TRUE;
    }
}

/**
 * @Author ZhuZiKai
 * @Description
 * @date 2022/3/7 10:44
 */
public class MyCaffeineCache extends AbstractCaffeineCache {
    /**
     * Caffeine配置说明：
     * initialCapacity=[integer]: 初始的缓存空间大小
     * maximumSize=[long]: 缓存的最大条数
     * maximumWeight=[long]: 缓存的最大权重
     * expireAfterAccess=[duration]: 最后一次写入或访问后经过固定时间过期
     * expireAfterWrite=[duration]: 最后一次写入后经过固定时间过期
     * refreshAfterWrite=[duration]: 创建缓存或者最近一次更新缓存后经过固定的时间间隔，刷新缓存
     * recordStats：开发统计功能
     *
     * @return
     */
    @Override
    LoadingCache createLoadingCache() {
        loadingCache = Caffeine.newBuilder()
                .expireAfterWrite(1000L, TimeUnit.MILLISECONDS)
                .initialCapacity(10)
                .maximumSize(100)
                .recordStats()
                .build((CacheLoader<String, String>) key -> null);
        return loadingCache;
    }
}

/**
 * @Author ZhuZiKai
 * @Description
 * @date 2022/3/7 10:45
 */
@Configuration
public class CaffeineCacheConfig {
    @Bean
    public MyCaffeineCache MyCaffeineCache(){
        return new MyCaffeineCache();
    }
}

/**
 * @Author ZhuZiKai
 * @Description
 * @date 2022/1/6 9:45
 */
@Aspect
@Component
@Slf4j
public class IdempotentAspect extends BaseController {
    @Resource
    private MyCaffeineCache cache;
    private static final ThreadLocalUtil threadLocalUtil = new ThreadLocalUtil();
    @Around(value = "@annotation(idempotent)")
    public Object around(ProceedingJoinPoint joinPoint, Idempotent idempotent) throws Throwable {
        UserBO user = getUserBO(request);
        Integer userId = user.getUserId();
        String userRequest = userId + request.getRequestURI();
        threadLocalUtil.setLocalUserRequest(userRequest);
        Object uuid = cache.get(userRequest);
        VerifyUtils.throwWhen(uuid != null, idempotent.value());
        return joinPoint.proceed();
    }
    @AfterReturning(value = "@annotation(idempotent)")
    public void afterReturning(JoinPoint point, Idempotent idempotent) {
        try {
            cache.put(threadLocalUtil.getLocalUserRequest(), UUIDUtil.simpleUUID());
        } finally {
            threadLocalUtil.clearLocalUserRequest();
        }
    }
}