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Keep cache cleanup off Bukkit state - #339
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📝 WalkthroughWalkthrough
ChangesUser-cache cleanup
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant PlayerJoinEvent
participant UserDataManager
participant PlatformScheduler
participant Bukkit
participant StorageWorker
PlayerJoinEvent->>UserDataManager: Mark player online or offline
UserDataManager->>PlatformScheduler: Schedule online UUID capture
PlatformScheduler->>Bukkit: Read online players
Bukkit-->>PlatformScheduler: Return online players
PlatformScheduler->>StorageWorker: Submit captured UUIDs
StorageWorker->>UserDataManager: Check session and cache state
StorageWorker->>StorageWorker: Flush and retire eligible caches
Merge Risk: 🟡 Moderate · up to Confirm that the current implementation protects active player caches, reports cleanup failures, handles the no-server path, and builds successfully before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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| for (UUID uuid : Set.copyOf(userDataCache.keySet())) { | ||
| if (!onlineUUIDs.contains(uuid)) { | ||
| removeCacheNow(uuid); |
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When a player joins after online is captured but before the storage worker drains—particularly while that single worker is delayed by database work—the join can create a cache that appears in this later userDataCache snapshot even though its UUID is absent from the older onlineUUIDs snapshot. The cleanup then retires an actively online player's fresh cache, so capture the candidate cache generation alongside the online set or revalidate/fence joins before eviction.
AGENTS.md reference: AGENTS.md:L35-L35
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Inline comments:
In
`@AdvancedCore/src/main/java/com/bencodez/advancedcore/api/user/usercache/UserDataManager.java`:
- Line 1174: Wrap the eviction work submitted through timer in failure handling
so exceptions from clearNonNeededCachedUsers, including removeCacheNow failures,
are caught and passed to reportDeferredStorageFailure within the task.
- Around line 1187-1188: In UserDataManager, update the handoff between
capturing onlineUUIDs and calling removeCacheNow to track each player's join
generation; skip eviction when that generation changed after the snapshot was
captured, while preserving eviction for players who remained offline.
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| java.util.ArrayList<CacheCleanupCandidate> candidates = new java.util.ArrayList<>(); | ||
| for (Entry<UUID, UserDataCache> entry : userDataCache.entrySet()) { | ||
| if (!online.contains(entry.getKey())) { | ||
| UserDataCache cache = entry.getValue(); | ||
| candidates.add(new CacheCleanupCandidate(entry.getKey(), cache, cache.getSharedSnapshotVersion())); |
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On servers where bulk/offline-user operations have accumulated a large userDataCache, this platform task now traverses the entire unbounded map and enters every cache monitor through getSharedSnapshotVersion(). Because Bukkit/Paper executes this runTask on the server thread, the hourly cleanup can stall ticks; capture only the online UUIDs there, then perform a bounded traversal on the storage worker with join revalidation before eviction.
AGENTS.md reference: AGENTS.md:L57-L58
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Inline comments:
In
`@AdvancedCore/src/main/java/com/bencodez/advancedcore/api/user/usercache/UserDataManager.java`:
- Line 1216: Rename the lambda-local boolean `removed` in the
`retireSharedCache` flow to avoid shadowing the existing `int removed` in scope.
Use the new name consistently in the listener check and the `retired.set` call.
In
`@AdvancedCore/src/test/java/com/bencodez/advancedcore/tests/user/UserDataManagerCacheCleanupThreadingTest.java`:
- Around line 12-14: Add the missing UUID and UserDataCache imports and a static
import for Assertions.assertTrue in UserDataManagerCacheCleanupThreadingTest;
retain the existing Mockito static import.
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| current.cancelRemoval(); | ||
| throw failure; | ||
| } | ||
| boolean removed = retireSharedCache(candidate.uuid(), current); |
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🎯 Functional Correctness | 🔴 Critical | ⚡ Quick win
Rename the lambda-local removed variable.
int removed is already in scope from Line 1199. Java does not allow a lambda-local variable to shadow it, so this file cannot compile. Rename the boolean, and use the new name in the listener check and retired.set call. (docs.oracle.com)
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In
`@AdvancedCore/src/main/java/com/bencodez/advancedcore/api/user/usercache/UserDataManager.java`
at line 1216, Rename the lambda-local boolean `removed` in the
`retireSharedCache` flow to avoid shadowing the existing `int removed` in scope.
Use the new name consistently in the listener check and the `retired.set` call.
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| import com.bencodez.advancedcore.AdvancedCorePlugin; | ||
| import com.bencodez.advancedcore.api.user.usercache.UserDataManager; | ||
| import com.bencodez.simpleapi.scheduler.BukkitScheduler; |
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🎯 Functional Correctness | 🔴 Critical | ⚡ Quick win
Import the symbols used by the tests.
Neither test can compile as written. Add imports for java.util.UUID and UserDataCache, plus a static import for org.junit.jupiter.api.Assertions.assertTrue. The Mockito static import does not provide assertTrue. (docs.oracle.com)
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only still-valid issues, skip the rest with a brief reason, keep changes
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In
`@AdvancedCore/src/test/java/com/bencodez/advancedcore/tests/user/UserDataManagerCacheCleanupThreadingTest.java`
around lines 12 - 14, Add the missing UUID and UserDataCache imports and a
static import for Assertions.assertTrue in
UserDataManagerCacheCleanupThreadingTest; retain the existing Mockito static
import.
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| } | ||
| }; | ||
| if (Bukkit.getServer() == null) capture.run(); | ||
| else plugin.getBukkitScheduler().runTask(plugin, capture); |
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When the platform scheduler transiently rejects this submission while the plugin is still enabled, the exception escapes into the scheduleAtFixedRate callback at lines 635–637; ScheduledExecutorService then suppresses every subsequent hourly invocation, leaving offline-user caches uncollected until restart. Catch the scheduler failure here, report it, and allow the periodic task to run again.
AGENTS.md reference: AGENTS.md:L57-L57
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| public boolean containsKey(UUID fromString) { return userDataCache.containsKey(fromString); } | ||
| /** Return an already-published cache snapshot without creating or populating one. */ | ||
| public UserDataCache getPublishedCache(UUID uuid) { |
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Removing UserDataManager.containsKey(UUID) breaks the library's public compatibility surface: existing tests still invoke it, and already-compiled downstream plugins that use it will fail with NoSuchMethodError when loaded against this JAR. Preserve the method, optionally deprecating it and delegating to the cache map, rather than deleting it as part of the cleanup refactor.
AGENTS.md reference: AGENTS.md:L27-L27
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| return; | ||
| } | ||
|
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| try { plugin.getUserManager().getDataManager().markUserOnline(java.util.UUID.fromString(event.getUuid())); } |
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When a player disconnects after user.getPlayer() returns but before this asynchronous login handler reaches the marker, onPlayerQuit removes the UUID first and this later add restores it after the player is offline. The queued quit cleanup may remove the current cache, but subsequent platform snapshots only add online UUIDs and never reconcile absent ones, so the stale session marker permanently exempts any future cache for this UUID from hourly eviction. Move session admission to the actual Bukkit join event or fence it with the corresponding quit/session generation.
AGENTS.md reference: AGENTS.md:L35-L35
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| UUID storageUuid = onlineStorageUuid(player); | ||
| if (storageUuid != null) { | ||
| online.add(storageUuid); | ||
| onlineUserSessions.add(storageUuid); |
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On Folia, this global/platform snapshot can overlap a region-thread PlayerQuitEvent: if the quit handler removes the UUID and this line subsequently adds it from the still-visible player collection, the marker becomes stale. Because later snapshots only add sessions and never reconcile UUIDs absent from the online set, caches subsequently created for that offline user are permanently exempt from hourly eviction. The fresh evidence after the earlier join-marker change is this independent, unfenced snapshot write; use a session generation or reconcile removals without overwriting newer join/quit events.
AGENTS.md reference: AGENTS.md:L35-L35
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| current.beginRemoval(); | ||
| if (Boolean.TRUE.equals(onlineUserSessions.get(uuid))) { |
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When a player joins after this final session check but while clearCache() is flushing storage, markUserOnline() cannot stop the already-admitted cleanup, which proceeds to retire the now-online player's cache; join handlers or other work using that cache can then fail because beginRemoval() has marked it as retiring. Fresh evidence in this revision is that the new second check is still followed by an unguarded flush-and-retire interval, so the earlier join/eviction race remains; coordinate the session generation and retirement atomically rather than relying on another pre-flush read.
AGENTS.md reference: AGENTS.md:L35-L35
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Inline comments:
In
`@AdvancedCore/src/main/java/com/bencodez/advancedcore/api/user/usercache/UserDataManager.java`:
- Around line 1188-1191: In the capture runnable in UserDataManager, skip the
Bukkit.getOnlinePlayers() lookup when Bukkit.getServer() is null. Guard the
player iteration with a server-presence check while preserving the existing UUID
collection behavior when a server is available.
- Line 1291: Update the sharedSqlRoute retirement path in UserDataManager to
call current.cancelRemoval() if current.retireAfterSharedFlush() fails, then
propagate the failure, matching the rollback behavior in removeCacheExclusively.
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AdvancedCore/src/main/java/com/bencodez/advancedcore/listeners/PlayerJoinEvent.java (1)
72-72: LGTM!Also applies to: 160-161
AdvancedCore/src/test/java/com/bencodez/advancedcore/tests/user/UserDataManagerCacheCleanupThreadingTest.java (1)
1-167: LGTM!AdvancedCore/src/main/java/com/bencodez/advancedcore/api/user/usercache/UserDataManager.java (1)
1228-1238: 🩺 Stability & AvailabilityThe suspected platform-thread storage lookup is not reachable in offline mode.
UuidLookup.getUUIDderives the UUID from the normalized player name and returns before any storage orOfflinePlayerlookup. ThereforeonlineStorageUuiddoes not triggerwithSharedNativeUserStorage, the cited exception, or thenullresult for a normal player name.
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| if (Boolean.TRUE.equals(onlineUserSessions.get(uuid))) { | ||
| current.cancelRemoval(); | ||
| return; |
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When a player joins after beginRemoval() while current.clearCache() is flushing, this branch preserves the same mapped cache even though UserDataCache.clearCache() has already emptied its snapshot; cancelRemoval() only resets the removal flag and does not reload values or invalidate the completed-population marker. Immediate post-join lookups therefore treat an empty cache as populated and can return or write defaults until the delayed login refresh runs. Fresh evidence beyond the earlier retirement-race comment is that this new post-flush cancellation path retains the already-cleared instance; retire and repopulate/replace it instead.
AGENTS.md reference: AGENTS.md:L35-L35
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In
`@AdvancedCore/src/main/java/com/bencodez/advancedcore/listeners/PlayerJoinEvent.java`:
- Line 80: In onPlayerLogin, move the markUserOnline call before the
isLoadUserData() early return, while retaining the null and enabled checks to
prevent access when the plugin is unavailable. Keep user-data loading behind the
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AdvancedCore/src/main/java/com/bencodez/advancedcore/api/user/usercache/UserDataManager.java (2)
1264-1309: LGTM!
1230-1240: 🩺 Stability & AvailabilityThe blocking-I/O concern is refuted.
UuidLookup.getUUIDenters the offline-mode branch inresolveUUID, derives the UUID withUUID.nameUUIDFromBytes, caches it, and returns before any storage orBukkit.getOfflinePlayerlookup. The calls fromonlineStorageUuidtherefore do not reach blocking lookup code in offline mode.AdvancedCore/src/main/java/com/bencodez/advancedcore/listeners/PlayerJoinEvent.java (1)
174-174: LGTM!AdvancedCore/src/test/java/com/bencodez/advancedcore/tests/user/UserDataManagerCacheCleanupThreadingTest.java (1)
1-214: LGTM!
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| if (Boolean.TRUE.equals(state)) online.add(uuid); | ||
| } | ||
| } | ||
| for (UUID uuid : Set.copyOf(onlineUserSessions.keySet())) { |
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On a server with heavy join/quit churn, this platform-scheduler callback copies and traverses every session recorded since the previous successful cleanup, so thousands of disconnected UUID tombstones can stall a Bukkit tick; repeated scheduler or worker rejection lets the map grow even longer. Fresh evidence beyond the earlier cache-map traversal issue is that the new onlineUserSessions map is itself unbounded between successful captures. Keep the Bukkit callback limited to collecting currently online UUIDs, and reconcile/prune the session map on the storage worker.
AGENTS.md reference: AGENTS.md:L53-L57
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| if (Boolean.FALSE.equals(onlineUserSessions.get(uuid)) && !platformOnline.contains(uuid)) { | ||
| onlineUserSessions.remove(uuid, Boolean.FALSE); |
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When two captures queue behind a blocked storage worker—an older snapshot without the player and a newer pre-quit snapshot containing them—a subsequent quit first records FALSE, but processing the older snapshot here removes that tombstone; the newer stale snapshot then sees no fence and writes TRUE, permanently exempting future caches for the offline UUID from cleanup. Fresh evidence beyond the earlier snapshot/quit concern is this new per-snapshot tombstone pruning; retain a session generation or discard superseded snapshots so an older absence cannot erase a newer quit.
AGENTS.md reference: AGENTS.md:L35-L35
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Summary
Split stale-user cache cleanup across the correct thread boundaries.
containsKey(UUID)compatibility methodValidation
mvn -B -f AdvancedCore/pom.xml clean package: 970 tests, 0 failures/errors/skipsgit diff --checkpassed692bcc497f98fc1c2478c2810a746337f084e707422ea78b6739f11474f6f5c2Summary by CodeRabbit