EventMachine is a software system designed for writing highly scalable applications for Ruby. It provides event-driven I/O using the reactor pattern. EventMachine is the most popular library for concurrent computing in the Ruby programming language.
EventMachine has been used to build a number of different libraries and frameworks in which concurrency is a performance concern. Some examples include:
- critical networked applications
- web servers and proxies
- email and IM production systems
- authentication/authorization processors