A high-performance, thread-safe ring buffer wheel for scheduling delayed tasks. It uses a power-of-2 sized circular buffer, bitwise modulo for indexing, and supports task cancellation. The implementation is self-contained (only depends on standard Java and Lombok) and can be extracted as a standalone delay-task scheduler. It demonstrates non-obvious skill in lock-free design and efficient cycle calculation.

A dynamic proxy-based HTTP RPC client that converts interface method calls into RESTful HTTP requests using OkHttp. It handles serialization, deserialization of generic types (including nested generics like BaseResponse<Set<CIMUserInfo>>), and supports both GET and POST methods via annotations. While it imports several internal utility classes, the pattern of using Java Proxy and annotations for RPC is highly reusable and demonstrates advanced reflection and proxy techniques.

An abstract implementation of consistent hashing with MD5-based hash computation and virtual node support. It provides a template method pattern for adding nodes, sorting, and selecting the first node. Concrete implementations (TreeMapConsistentHash and SortArrayMapConsistentHash) demonstrate different data structure choices. This component is self-contained within cim-common and can be reused in any distributed system requiring consistent hashing for load balancing.

A clean interface for backoff strategies with a default method for executing the backoff. The accompanying RandomBackoff implementation provides a simple random backoff between 3-10 seconds. This is a minimal, isolated pattern that can be extracted and reused in any retry logic across different projects.