Add caching capability
Add caching capability

prasadph/howdoi,prasadph/howdoi,allengaller/howdoi,nju520/howdoi,gleitz/howdoi,gleitz/howdoi,Xuefeng-Zhu/howdoi,zhengzhihust/howdoi,JackNokia/howdoi,nju520/howdoi,stallman-cui/howdoi,stallman-cui/howdoi,godfreyy/howdoi,chrisspen/howdou,allengaller/howdoi,kv9699/howdoi,chrisspen/howdou,wujinbin/howdoi,godfreyy/howdoi,JackNokia/howdoi,jasonfellows/howdoi,jasonfellows/howdoi,q1ang/howdoi,zhengzhihust/howdoi,wujinbin/howdoi,q1ang/howdoi,kv9699/howdoi,Xuefeng-Zhu/howdoi