7-3

golang.org/x/sync/singleflightを利用したコード例

実行方法

$ go run main.go

リスト4 実行結果

2022/02/05 18:58:50 call HeavyGet 2
2022/02/05 18:58:50 call HeavyGet 1
2022/02/05 18:58:50 call HeavyGet 7
2022/02/05 18:58:50 call HeavyGet 3
2022/02/05 18:58:50 call HeavyGet 9
2022/02/05 18:58:50 call HeavyGet 0
2022/02/05 18:58:50 call HeavyGet 8
2022/02/05 18:58:50 call HeavyGet 5
2022/02/05 18:58:50 call HeavyGet 4
2022/02/05 18:58:50 call HeavyGet 6
2022/02/05 18:58:52 0
2022/02/05 18:58:52 2
2022/02/05 18:58:52 4
2022/02/05 18:58:52 6
2022/02/05 18:58:52 8
2022/02/05 18:58:52 10
2022/02/05 18:58:52 12
2022/02/05 18:58:52 14
2022/02/05 18:58:52 16
2022/02/05 18:58:52 18