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Achievements

Achievement: YOLOAchievement: Pull Sharkx2Achievement: Pair Extraordinairex2Achievement: StarstruckAchievement: Quickdraw

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DavidHLP/README.md

DavidHLP — Engineering Archive. Java backend, caching and distributed systems.

ARCHIVE TERMINAL   /   SOURCE CODE   /   FIELD NOTES

00 / Profile

Java backend developer working on caching and distributed systems.

I maintain ResiCache and UltiCode. My work focuses on cache consistency, reliable asynchronous execution, and clear service boundaries. I write about the implementation details, trade-offs, and checks behind those systems.

Correctness, clear boundaries, and reproducible results.

01 / Project index

P–001   ResiCache

Composable cache protection for Spring Cache and Redis.

Annotation-driven protection combines null-value caching, TTL jitter, distributed locking, and early refresh through a configurable handler chain. The engineering focus is explicit behavior around expiration, concurrent loading, and safe serialization.

JAVA   /   SPRING CACHE   /   REDIS   /   REDISSON

P–002   UltiCode

An online judge platform with sandboxed code evaluation.

Problem libraries, contests, and community features backed by application services and independent judge workers. A practical setting for service ownership, recoverable task delivery, and consistent API contracts.

JAVA   /   SPRING BOOT   /   REDIS   /   DOCKER   /   VUE

02 / Field notes

Selected implementation records. Article text is in Chinese.

Record Subject
N–001 Cache stampedes: futures, distributed locks, and double-checking
N–002 Recoverable judge delivery with an outbox and Redis Streams

Explore the archive →

DAVIDHLP   /   ENGINEERING ARCHIVE   /   PUBLIC INDEX

Pinned Loading

  1. ResiCache ResiCache Public

    Cache protection for Spring Cache + Redis: penetration, breakdown, avalanche, hot-key refresh via @RedisCacheable.

    Shell 1

  2. UltiCode UltiCode Public

    UltiCode — an open-source full-stack online judge platform for developers: problem library, algorithm contests, sandboxed judging, editorials, community, and admin console — ready out of the box.

    Java 1 2

  3. DavidHLP.github.io DavidHLP.github.io Public

    TypeScript

  4. DeusData/codebase-memory-mcp DeusData/codebase-memory-mcp Public

    High-performance code intelligence MCP server. Indexes codebases into a persistent knowledge graph — average repo in milliseconds. 158 languages, sub-ms queries, 99% fewer tokens. Single static bin…

    C 43.5k 3.5k

  5. ZiZIGY/vue-dnd-kit ZiZIGY/vue-dnd-kit Public

    🎯 Modern drag & drop solution for Vue 3 applications. Simple API, powerful features, zero dependencies.

    TypeScript 252 12