ВЕРСИИ (8)

## Added - Transactional file migration using a temporary staging directory to ensure all-or-nothing data transfer - Non-blocking retry mechanism using `ScheduledExecutorService` with configurable delay between attempts - Automatic rollback of backup files when the final atomic move operation fails - Staging directory cleanup on transfer failure to prevent leftover temporary files - `FilePair` helper class to encapsulate source, temporary destination, final destination, and critical/optional flag for each migrated file ## Fixed - Thread pool blocking caused by recursive `copyWithRetry` consuming worker threads during retry waits - Data inconsistency when some files succeed and others fail during a single transfer operation (partial transfer no longer possible) - Backup file not being created before the main data copy, risking loss of the target player's original data ## Changed - `copyWithRetry` now uses `ScheduledExecutorService` for delayed retries instead of recursive calls on the main executor pool - `copyFile` now performs a single copy attempt and returns immediately, with retry logic handled externally - `transferPlayerData` and related methods replaced by `transferAllFiles`, `copyAllToTemp`, and `moveTempToTarget` to support transactional migration - Backup creation and optional file transfers (stats, advancements) integrated into the unified transactional pipeline - `ExecutorService` renamed to `executor` for clarity; new `scheduler` field added for delayed retry scheduling ## Removed - Recursive retry logic (`copyWithRetry` calling itself with `thenCompose`) that blocked worker threads - Separate `backupIfNeeded`, `transferMainData`, `transferExtraData`, and `transferFile` methods, consolidated into `transferAllFiles` and supporting methods - Direct file overwrite approach that allowed partial transfer states

### Added - Added `MAX_CACHE_SIZE` (1000) limit to prevent memory overflow when loading usercache.json - Added automatic cleanup task to remove stale player locks and access records every hour - Added performance monitoring with loading time statistics in debug logs - Added detailed debug logging for file operations, lock acquisition, and error conditions - Added disk space check before backup operations ### Changed - **Refactored data loading**: Merged `loadUserCache()` and `loadNameToUUIDs()` into single `loadPlayerData()` method for better performance - **Improved lock management**: Locks now track last access time and are automatically cleaned up - **Enhanced error handling**: All exceptions now include detailed debug messages instead of being ignored - **Optimized file copying**: Implemented atomic temp file operations with proper cleanup - **Restructured command handling**: Unified `transfer` and `transferuuid` logic into single method - **Improved backup system**: Added proper file existence checks and atomic operations - **Enhanced tab completion**: Added offline player name suggestions with limits - **Better executor shutdown**: Added timeout handling and forced termination if needed ### Fixed - **Critical**: Fixed recursive scheduling in `startCleanupTask()` that could cause stack overflow - **Critical**: Removed dangerous offline UUID fallback that could match wrong players (`UUID.nameUUIDFromBytes`) - Fixed scheduler parameter bug where `null` could be passed instead of plugin instance - Fixed potential memory leak by properly removing locks on player quit - Fixed file copy failure when parent directories don't exist - Fixed race condition in task tracking set during concurrent operations - Fixed incorrect stats file extension for older server versions (<1.13) - Fixed potential deadlock by implementing consistent lock ordering - Fixed missing message placeholders in several command responses ### Removed - Removed dangerous offline UUID generation (`UUID.nameUUIDFromBytes`) - Removed redundant `async` parameter from Bukkit scheduler calls - Removed duplicate data loading methods in favor of unified approach - Removed empty catch blocks that silently ignored exceptions - Removed unnecessary thread pool for simple operations

### Added - Folia server support with global region scheduler - Async file copy operations with buffered streams - User cache loading from usercache.json - Name-to-UUID mapping system for offline player lookup - Backup file creation with configurable suffix - Disk space checking before file operations (50MB reserve) - File copy retry mechanism (3 retries with 1 second delay) - Atomic file operations using temporary files - Memory leak prevention with automatic lock cleanup system - Periodic cache cleanup task (runs every hour) - Player quit event listener to remove unused locks - Last access time tracking for lock management - Version detection fallback for unknown server versions - Multi-language support with message placeholders - Stats and advancements transfer with version detection - List command for player data with pagination - Tab completion with online and offline player support - Player kick option for online target players ### Changed - Migrated to CompletableFuture for reliable async operations - Optimized concurrent map operations with atomic replacements - Improved UUID parsing with better error handling and formatting - Enhanced scheduler with automatic Folia/Bukkit detection - Simplified logging system while keeping debug functionality - Better resource cleanup in onDisable() with timeout handling - Streamlined configuration loading with auto-fix - More efficient name-to-UUID mapping updates - Optimized file copy with proper buffer sizing (8KB) - Improved lock acquisition with timeout and deadlock prevention ### Fixed - Potential memory leak from unclosed player locks - Thread safety issues in cache loading (added synchronization) - Disk space exhaustion crashes during file transfer - Server version detection crashes with unusual formats - Concurrent modification issues in map operations - File copy failures due to cross-filesystem moves - Backup file corruption from incomplete writes - Tab completion NPE with null permissions - UUID format inconsistencies in user input - Player kick timing issues with async operations - Configuration loading errors with missing keys - Resource leaks in file streams (try-with-resources) - Shutdown hangs from unfinished tasks ### Removed - Redundant constant classes (merged into simple constants) - Excessive logging methods (consolidated into core ones) - Overly detailed debug outputs (kept essential only) - Unnecessary map clearing operations - Duplicate code blocks in transfer handling - Deprecated Bukkit API usages - Legacy version color formatting (simplified version display) - Redundant permission checks in tab completion Nah, this is a big work, honestly. Not gonna give up of it.

### Changed - More stable and safe action! - The code is shorter than the old one. - The plugin runs faster.

### Added - Folia supported! ### Changed - Optimized the size of JAR.

### Added - Supports 1.8.x ~ 1.12.x now!

### Added - **Full configuration system** - Now with proper config.yml support - **Auto-config fixing** - Missing config entries are automatically restored - **Beautiful console logo** - ASCII art on startup (can be disabled in config) - **Colored version display** - Alpha (red), Beta (gold), Release (green) - **Multi-language support** - Messages fully customizable in config - **Player name tab completion** - Tab completes online players and players with data files - **Kick online players option** - Prevents data overwrite (configurable) - **Asynchronous file operations** - No more server lag during transfers - **Backup system** - Automatically creates .old files before overwriting - **/xtransfer reload command** - Reload configuration without restart ### Changed - **Version display format** - Now matches XGamemode style (XTransfer V1.1-alpha) - **Command output** - All messages now from config file - **UUID detection** - Better handling of premium/offline players - **File copying** - Using NIO for better performance ### Fixed - **NullPointerException in loadMessages()** - Messages map now properly initialized - **Null version in onDisable()** - Added DISPLAY_VERSION for reliable shutdown - **Config corruption** - Auto-fixes missing config values - **Online player data overwrite** - Kicks player before transfer (optional)

Plugin done! This is just a demo so it doesn't have multi language, config file and other extra features yet. I will do it when I'm free and I want to code.