dispatch_test.rb

require "benchmark"

@callbacks = %w(
  TimerFired
  ConnectionData
  ConnectionUnbound
  ConnectionAccepted
  ConnectionCompleted
  LoopbreakSignalled
  ConnectionNotifyReadable
  ConnectionNotifyWritable
  SslHandshakeCompleted
)

@callbacks.each_with_index { |cb, i| Object.const_set(cb, i + 100) }

def make_class(name)
  Class.new { eval "def call; #{name.inspect}; end" }
end

@callbacks.map! { |c| make_class(c.to_sym).new }

def elif(n)
  if n == TimerFired
    :TimerFired
  elsif n == ConnectionData
    :ConnectionData
  elsif n == ConnectionUnbound
    :ConnectionUnbound
  elsif n == ConnectionAccepted
    :ConnectionAccepted
  elsif n == ConnectionCompleted
    :ConnectionCompleted
  elsif n == LoopbreakSignalled
    :LoopbreakSignalled
  elsif n == ConnectionNotifyReadable
    :ConnectionNotifyReadable
  elsif n == ConnectionNotifyWritable
    :ConnectionNotifyWritable
  elsif n == SslHandshakeCompleted
    :SslHandshakeCompleted
  end
end

def idex(n)
  n = n - 100
  @callbacks[n].call
end

TESTS = 100_000
Benchmark.bmbm do |results|
  results.report("elif:") { TESTS.times { |n| elif( (n % 8) + 100 ) } }
  results.report("idex:") { TESTS.times { |n| idex( (n % 8) + 100 ) } }
end