EventMachine is a library for Ruby, C++, and Java programs. It
provides event-driven I/O using the Reactor pattern. EventMachine is
designed to simultaneously meet two key needs:

    * Extremely high scalability, performance and stability for the
most demanding production environments; and
    * An API that eliminates the complexities of high-performance
threaded network programming, allowing engineers to concentrate on
their application logic.

This unique combination makes EventMachine a premier choice for
designers of critical networked applications, including web servers
and proxies, email and IM production systems, authentication/
authorization processors, and many more.