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EventMachine (EM) can respond to keyboard events. This gives your event-driven
programs the ability to respond to input from local users.
Programming EM to handle keyboard input in Ruby is simplicity itself. Just use
EventMachine#open_keyboard, and supply the name of a Ruby module or class that
will receive the input:
require 'rubygems'
require 'eventmachine'
module MyKeyboardHandler
def receive_data keystrokes
puts "I received the following data from the keyboard: #{keystrokes}"
end
end
EM.run {
EM.open_keyboard(MyKeyboardHandler)
}
If you want EM to send line-buffered keyboard input to your program, just
include the LineText2 protocol module in your handler class or module:
require 'rubygems'
require 'eventmachine'
module MyKeyboardHandler
include EM::Protocols::LineText2
def receive_line data
puts "I received the following line from the keyboard: #{data}"
end
end
EM.run {
EM.open_keyboard(MyKeyboardHandler)
}
As we said, simplicity itself. You can call EventMachine#open_keyboard at any
time while the EM reactor loop is running. In other words, the method
invocation may appear anywhere in an EventMachine#run block, or in any code
invoked in the #run block.
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