@Override
    public void putCache(String key, CacheObj value) {
        if(cache == null){
            return;
        }

        cache.put(key, value);
    }
Reason:
Date: 2018/9/10
Company: www.dtstack.com
@author xuchao
core/src/main/java/com/dtstack/flink/sql/side/cache/LRUSideCache.java