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| author | version | line-number | content |
|---|---|---|---|
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2.1 | 1 | get命令本质是调用了lookupKeyRead这个底层方法， |
| 2 | lookupKeyRead方法如下： | ||
| 3 | |||
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1.1 | 4 | {{plantuml}} |
| 5 | @startuml | ||
| 6 | start | ||
| 7 | |||
| 8 | |||
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2.1 | 9 | : lookupKeyReadWithFlags; |
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1.1 | 10 | |
| 11 | |||
| 12 | end | ||
| 13 | @enduml | ||
| 14 | {{/plantuml}} | ||
| 15 | |||
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2.1 | 16 | |
| 17 | lookupKeyReadWithFlags方法如下： | ||
| 18 | |||
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1.1 | 19 | {{plantuml}} |
| 20 | @startuml | ||
| 21 | start | ||
| 22 | |||
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8.1 | 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) | ||
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2.1 | 25 | :返回null； |
| 26 | stop | ||
| 27 | endif | ||
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1.1 | 28 | |
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8.1 | 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) |
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2.1 | 30 | :返回null; |
| 31 | stop | ||
| 32 | endif | ||
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1.1 | 33 | |
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3.1 | 34 | :调用lookupKey方法，查询value的值； |
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7.1 | 35 | if (返回值为空) then(yes) |
| 36 | :缓存命中+1; | ||
| 37 | else(no) | ||
| 38 | :缓存非命中+1; | ||
| 39 | endif | ||
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5.1 | 40 | |
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2.1 | 41 | :返回查询的结果; |
| 42 | |||
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1.1 | 43 | end |
| 44 | @enduml | ||
| 45 | {{/plantuml}} |