ConcurrentHashMap实现本地缓存工具类

public class CacheDemo{

	private static final Map<String, Object> CACHE_MAP = new ConcurrentHashMap<>();

	public static void put(String cacheName, String authorization, long expireIn) {
		CACHE_MAP.put(cacheName, authorization);
		CACHE_MAP.put(cacheName + "_" + Constants.EXPIRES_IN, LocalDateTime.now().plus(expireIn, ChronoUnit.SECONDS));
		log.info("{} :is successfully stored in the cache!expires in:{}", cacheName, expireIn);
	}

	public static Object get(String cacheName) {
		if (checkCacheName(cacheName)) {
			return CACHE_MAP.get(cacheName);
		}
		return null;
	}

	private static boolean checkCacheName(String cacheName) {
		LocalDateTime cacheHoldTime = (LocalDateTime) CACHE_MAP.get(cacheName + "_" + Constants.EXPIRES_IN);
		if (cacheHoldTime == null) {
			return false;
		}
		if (LocalDateTime.now().isAfter(cacheHoldTime)) {
			log.info("cache:{} has been expired!", cacheName);
			remove(cacheName);
			return false;
		}
		return true;
	}

	public Integer size() {
		return CACHE_MAP.size();
	}

	public boolean isExist(String cacheName) {
		if (!checkCacheName(cacheName)) {
			return Boolean.FALSE;
		}
		return CACHE_MAP.containsKey(cacheName);
	}

	public static void remove(String cacheName) {
		CACHE_MAP.remove(cacheName);
		CACHE_MAP.remove(cacheName + "_" + Constants.EXPIRES_IN);
	}
}