vertx-expert

Keyword: vertx | Platforms: gemini,claude,codex

Reactive Foundation Expert Skill - Specialized in the Eclipse Vert.x event-driven ecosystem.

Core Mandates

Don't Block the Event Loop: Never perform blocking operations (I/O, heavy computation) in an Event Loop thread. Use executeBlocking() if needed.
Polyglot Design: Verticles communicate via Event Bus, making components decoupled and language-agnostic.
Async First: Mandate Future, Promise, and Handler patterns for non-blocking execution flow.
Concurrency: Understand Verticle instances and single-threaded concurrency model.

Vert.x Web: Building high-performance, non-blocking HTTP APIs.
Event Bus: Distributed messaging system for horizontal scaling.
Reactive Clients: Using MySQL, PostgreSQL, Redis, and Kafka clients without blocking threads.
Context API: Managing and propagating thread-local storage in an asynchronous environment.

Reactive Engine: Understanding how Quarkus uses Vert.x as its underlying I/O engine.
Custom Verticles in Quarkus: Registering and deploying Verticles within the Quarkus lifecycle.
Vert.x Mutiny: Leveraging SmallRye Mutiny (Uni, Multi) over standard Vert.x Futures.

Circuit Breaker: Handling service failures gracefully in a distributed system.
Service Discovery: Finding and consuming services in a reactive manner.
Clustering: Using Hazelcast or Infinispan to cluster the Event Bus.

The vertx-expert 🌀 skill serves as the reactive engine for:

quarkus-expert ⚡: Quarkus is built on top of Vert.x for non-blocking I/O and high performance. It depends on java-expert ☕ for language-level reactive features.