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... ... @@ -20,17 +20,16 @@ 20 20 @startuml 21 21 start 22 22 23 -if 24 -if (yes)23 +if(调用expireIfNeeded方法判断key是否过期)then(1) 24 +if(当前环境为主节点)then(yes) 25 25 :返回null; 26 26 stop 27 27 endif 28 28 29 -if 29 +if(当前环境为从节点,并且命令为读的时候,那说明key过期是安全的)then(yes) 30 30 :返回null; 31 31 stop 32 32 endif 33 -endif 34 34 35 35 :调用lookupKey方法,查询value的值; 36 36 if (返回值为空) then(yes)