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$: << 'lib' << '../lib'
require 'eventmachine'
require 'em-http'
require 'fiber'
# Using Fibers in Ruby 1.9 to simulate blocking IO / IO scheduling
# while using the async EventMachine API's
def async_fetch(url)
f = Fiber.current
http = EventMachine::HttpRequest.new(url).get :timeout => 10
http.callback { f.resume(http) }
http.errback { f.resume(http) }
Fiber.yield
if http.error
p [:HTTP_ERROR, http.error]
end
http
end
EventMachine.run do
Fiber.new{
puts "Setting up HTTP request #1"
data = async_fetch('http://0.0.0.0/')
puts "Fetched page #1: #{data.response_header.status}"
puts "Setting up HTTP request #2"
data = async_fetch('http://www.yahoo.com/')
puts "Fetched page #2: #{data.response_header.status}"
puts "Setting up HTTP request #3"
data = async_fetch('http://non-existing.domain/')
puts "Fetched page #3: #{data.response_header.status}"
EventMachine.stop
}.resume
end
puts "Done"
# Setting up HTTP request #1
# Fetched page #1: 302
# Setting up HTTP request #2
# Fetched page #2: 200
# Done
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