EventMachine

EventMachine is a Ruby library for building event-driven and scalable network applications. Its main points are:

Overall, EventMachine is a powerful and flexible library for building event-driven and scalable network applications in Ruby. Its focus on non-blocking I/O and event-driven architecture allows for high-performance and efficient use of system resources, making it a popular choice for building real-time applications.

Key features

• Event-driven architecture: EventMachine uses an event loop to manage the processing of network events, such as socket connections and data transfers. This allows for efficient use of system resources and supports a high number of concurrent connections.
• Non-blocking I/O: EventMachine uses non-blocking I/O to enable efficient and scalable network communication. This means that multiple network requests can be processed concurrently without blocking the execution of other code.
• High-performance and scalability: EventMachine is designed to support high-performance and scalable network applications, such as web servers, chat servers, and other real-time applications. Its event-driven architecture and non-blocking I/O allow it to handle a large number of connections and data transfers.
• Support for multiple protocols: EventMachine supports a variety of network protocols, including TCP, UDP, SSL, and HTTP. This makes it a versatile choice for building a wide range of network applications.
• Ruby-based API: EventMachine provides a Ruby-based API that is easy to use and familiar to Ruby developers. It also integrates with a variety of Ruby frameworks and libraries, such as Ruby on Rails and Sinatra, allowing for easy integration with existing codebases.

Async Programming

In Ruby, async programming is often implemented using the concept of “async/await” or “coroutines”. This allows code to be written in a synchronous-looking style while still executing asynchronously.

These libraries provide tools for performing non-blocking I/O and other tasks, as well as for managing and coordinating multiple tasks in an async environment:

• EventMachine
• Celluloid
• Async gem

Example

require 'async'

def fetch_data(url)
  Async do |task|
    response = task.async do
      Net::HTTP.get_response(URI(url))
    end

    body = task.async do
      response.body
    end

    [response, body]
  end
end

response, body = fetch_data('https://www.example.com').wait

puts "Response code: #{response.code}"
puts "Body length: #{body.length}"