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// TODO: it isn't actually multithreaded at all sclass CalculateEachElementOnce<A, B> { Map<A, Flag> calculating = syncMap(); Map<A, OKOrError<B>> calculated = syncMap(); synchronized B get(A a, IF1<A, B> f) { Flag flag = calculating.get(a); if (flag != null) { flag.waitUntilUp(); ret unpackOKOrError(calculated.get(a)); } else { flag = new Flag; calculating.put(a, flag); OKOrError<B> b = okOrError(() -> f.get(a)); calculated.put(a, b); calculating.remove(a); flag.raise(); ret b!; } } }
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Snippet ID: | #1032122 |
Snippet name: | CalculateEachElementOnce |
Eternal ID of this version: | #1032122/7 |
Text MD5: | 63af94d1bcb880ad6923f1c1a977bb6c |
Transpilation MD5: | 1696c8636c54a28d9fb2abc5b957a0d1 |
Author: | stefan |
Category: | javax / gazelles |
Type: | JavaX fragment (include) |
Public (visible to everyone): | Yes |
Archived (hidden from active list): | No |
Created/modified: | 2021-08-14 03:10:53 |
Source code size: | 591 bytes / 21 lines |
Pitched / IR pitched: | No / No |
Views / Downloads: | 133 / 265 |
Version history: | 6 change(s) |
Referenced in: | [show references] |