ModernUO/Projects/UOContent/Engines/Quests/Core
Kamron Batman ee2cd1d18d
feat: Adds new decay system and SkipSerialization (#2311)
## Summary

- Replaces scan-based decay checking during world saves with an event-driven timer wheel scheduler
- Removes virtual property checks from serialization hot path, achieving 6-8x faster world saves

## Changes

### DecayScheduler (new):
- Timer wheel with 12 HashSet buckets (5-min intervals) + PriorityQueue for active processing
- O(1) register/unregister vs O(n) scan of all items
- Auto start/stop when items exist/empty
- Configurable tick interval with jitter to prevent system synchronization

### Item.cs:
- Added ScheduledDecayTime computed property
- Added UpdateDecayRegistration() called from SetLastMoved(), property setters, AddItem()/RemoveItem()
- Hooks in Visible, Movable, Spawner setters and Delete()

### World.cs:
- Removed _decayQueue, EnqueueForDecay(), ProcessDecay()
- ItemPersistence.Serialize() now tight loop without virtual calls

## Performance

| Metric        | Before     | After     | Improvement |
|---------------|------------|-----------|-------------|
| Items (230K)  | 245K ticks | 34K ticks | 8x faster   |
| Mobiles (43K) | 56K ticks  | 6K ticks  | 9x faster   |
| Total         | 302K ticks | 40K ticks | 7.5x faster |

## Configuration

decay.maxItemsPerTick = 250       # Items processed per tick
decay.tickInterval = 256ms        # Base processing interval
decay.bucketInterval = 5min       # Timer wheel bucket size
decay.jitterMaxMs = 25            # ±25ms tick jitter
2026-01-08 11:43:51 -08:00
..
Items feat: Adds new decay system and SkipSerialization (#2311) 2026-01-08 11:43:51 -08:00
BaseQuester.cs fix: Moves ContextMenu out of core, streamlines code, fixes bugs (#1873) 2024-07-20 21:33:23 -07:00
QuestCallbackEntry.cs fix: Moves ContextMenu out of core, streamlines code, fixes bugs (#1873) 2024-07-20 21:33:23 -07:00
QuestConversation.cs fix: Fixes quest messages so they are all clilocs (#1883) 2024-07-22 20:44:32 -07:00
QuestItemInfo.cs Formats UO Content (#201) 2020-08-27 18:30:38 -07:00
QuestObjective.cs feat: Moves gumps out of the core (#1916) 2024-08-09 19:07:32 -07:00
QuestRestartInfo.cs fix(core): Caches DateTime.NowUtc (#548) 2021-03-13 01:32:04 -08:00
QuestSerializer.cs fix: Consolidates Color/Center html (#1762) 2024-05-07 23:56:32 -07:00
QuestSystem.cs feat: Adds size/style support to gump builders, optimizes EscapeHtml (#2257) 2025-11-23 11:35:31 -08:00