A generic, thread-safe LRU cache implementation using LinkedHashMap. Supports eviction listeners, bounded capacity, and concurrent access. Can be extracted and reused in any Java project requiring a bounded cache with least-recently-used eviction policy.

An interface for lock management with multiple implementations (partitioned, one-entry-per-key, simple RW). Provides acquire/release semantics with timeout and exception handling. Demonstrates a clean abstraction for distributed or local lock management that can be reused in other systems needing fine-grained locking.

Abstract base class for compression algorithms using the Template Method pattern. Concrete implementations (GZIP, ZLIB, etc.) define compress/decompress logic. The framework handles buffer management and error handling. Reusable in any Java application requiring pluggable compression.

A generic, configurable factory that registers implementations by name and creates instances based on configuration. Supports default implementations and custom overrides. Useful for plugin systems or strategy selection. Can be extracted and reused in any Java project needing a registry-based factory.