eventmachine/eventmachine

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

4277 stars · 633 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

EventMachine is an event-driven I/O and lightweight concurrency library for Ruby based on the Reactor pattern. It enables building highly scalable network servers, asynchronous clients, and proxies without complex threaded network programming.

Use cases

• build a scalable event-driven server in Ruby
• write asynchronous HTTP clients for REST APIs
• create efficient network proxies with custom logic
• monitor files and networks reactively
• implement custom network protocols in Ruby
• build real-time messaging or chat servers

When to choose

• you need high-performance event-driven I/O in Ruby
• you're building servers, proxies, or async clients on the Reactor pattern
• you need cross-platform support including Windows and JRuby
• you want a mature, battle-tested library

When to avoid

• you're using modern async/await Ruby code with the async gem ecosystem
• your use case is simple synchronous I/O without concurrency needs
• you prefer Fibers or Ractors-based concurrency models

Facets

library · maturity stable

concurrency networking http-server websocket networking developer-tools backend ruby cross-platform windows reactor-pattern event-driven-io async ruby-gem linux macos

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