private long getCurrentVersion(Cache cache, String versionKey) {
		Long cachedVersion = (Long) cache.get(versionKey);
		if (LOGGER.isDebugEnabled()) {
			LOGGER.debug("获取Key值为[" + versionKey + "]版本信息,版本号[" + cachedVersion + "]");
		}
		long currentVersion = 0;
		if (cachedVersion != null) {
			currentVersion = cachedVersion;
		}
		return currentVersion;
	}