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Seq.cache repro
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| open System.Collections.Generic | |
| let someDataSource = seq{ 1 .. 100 } | |
| let ordersForTask = Dictionary<int, seq<int>>() | |
| let getOrdersForTask task = | |
| match ordersForTask.TryGetValue task with | |
| | true, orders -> orders | |
| | false, _ -> | |
| let orders = | |
| someDataSource | |
| |> Seq.filter (fun n -> printfn "filtering..."; n % 2 = 0) | |
| |> Seq.cache | |
| ordersForTask.Add(task, orders) | |
| orders | |
| (* trying it out | |
| > getOrdersForTask 3 ;; | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| val it : seq<int> = seq [2; 4; 6; 8; ...] | |
| > getOrdersForTask 5 ;; | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| val it : seq<int> = seq [2; 4; 6; 8; ...] | |
| > getOrdersForTask 3 ;; | |
| val it : seq<int> = seq [2; 4; 6; 8; ...] | |
| > getOrdersForTask 3 ;; | |
| val it : seq<int> = seq [2; 4; 6; 8; ...] | |
| > getOrdersForTask 3 ;; | |
| val it : seq<int> = seq [2; 4; 6; 8; ...] | |
| > getOrdersForTask 7 ;; | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
| val it : seq<int> = seq [2; 4; 6; 8; ...] | |
| > getOrdersForTask 7 ;; | |
| val it : seq<int> = seq [2; 4; 6; 8; ...] | |
| > getOrdersForTask 7 |> Seq.length ;; | |
| filtering... | |
| filtering... | |
| filtering... | |
| filtering... | |
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| val it : int = 50 | |
| > getOrdersForTask 7 |> Seq.length ;; | |
| val it : int = 50 | |
| > getOrdersForTask 7 |> Seq.length ;; | |
| val it : int = 50 | |
| > getOrdersForTask 7 |> Seq.length ;; | |
| val it : int = 50 | |
| *) |
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