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// TODO: it isn't actually multithreaded at all sclass CalculateEachElementOnce { Map calculating = syncMap(); Map> calculated = syncMap(); synchronized B get(A a, IF1 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 = okOrError(() -> f.get(a)); calculated.put(a, b); calculating.remove(a); flag.raise(); ret b!; } } }