⚡ Bolt: Optimize HistoryGrouper date formatting #121
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Caches month boundaries and formatted strings in HistoryGrouper to avoid redundant Calendar operations and SimpleDateFormat calls for consecutive items in the same month. This reduces the computational overhead when grouping large history lists, especially for older items. Optimization: - Tracks cachedMonthStart and cachedMonthEnd to skip Calendar updates. - Reuses cachedMonthString for items falling within the same month window.
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💡 What: Optimized
HistoryGrouper.ktto cache month boundaries and formatted strings.🎯 Why: Iterating through a long history list (sorted by date) was causing redundant
Calendarcalculations andSimpleDateFormatformatting for every single item, even if they belonged to the same month.📊 Impact: Reduces
CalendarandDateFormatoperations from O(N) to O(M) where M is the number of unique months in the history list. For users with long history, this significantly reduces the CPU time required to group items.🔬 Measurement: Verified with
HistoryGrouperTestwhich includes scenarios for mixed items and boundary conditions. Although direct benchmarks are hard to capture in unit tests, the algorithmic improvement (removing inner loop allocations/calculations) is standard practice for date grouping.PR created automatically by Jules for task 11717478779778066669 started by @menny