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-get命令本质是调用了lookupKeyRead这个底层方法， |
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-lookupKeyRead方法如下： |
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- |
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{{plantuml}} |
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@startuml |
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start |
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+:GET Command; |
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-: lookupKeyReadWithFlags; |
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+: lookupKeyRead(); |
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end |
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@@ -13,37 +13,15 @@ |
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@enduml |
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{{/plantuml}} |
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- |
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-lookupKeyReadWithFlags方法如下： |
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- |
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{{plantuml}} |
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@startuml |
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start |
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-if(调用expireIfNeeded方法判断key是否过期)then(1) |
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-note left |
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-返回1代表已经过期 |
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-endnote |
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-if(当前环境为主节点)then(yes) |
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-:返回null; |
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-stop |
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-endif |
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+:lookupKeyRead(); |
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-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) |
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-:返回null; |
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-stop |
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-endif |
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-endif |
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+: lookupKeyReadWithFlags(); |
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-:调用lookupKey方法，查询value的值; |
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-if(返回值为空)then(yes) |
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-:缓存命中+1; |
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-else(no) |
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-:缓存非命中+1; |
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-endif |
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-:返回查询的结果; |
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- |
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end |
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@enduml |
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{{/plantuml}} |