class Puma::Events

for each event type.
Using ‘Puma::DSL` it is possible to register callback hooks
lifecycle events such as :on_booted, :on_restart, and :on_stopped.
This is an event sink used by `Puma::Server` to handle

def fire(hook, *args)

Fire callbacks for the named hook
def fire(hook, *args)
  @hooks[hook].each { |t| t.call(*args) }
end

def fire_on_booted!

def fire_on_booted!
  fire(:on_booted)
end

def fire_on_restart!

def fire_on_restart!
  fire(:on_restart)
end

def fire_on_stopped!

def fire_on_stopped!
  fire(:on_stopped)
end

def initialize

def initialize
  @hooks = Hash.new { |h,k| h[k] = [] }
end

def on_booted(&block)

def on_booted(&block)
  register(:on_booted, &block)
end

def on_restart(&block)

def on_restart(&block)
  register(:on_restart, &block)
end

def on_stopped(&block)

def on_stopped(&block)
  register(:on_stopped, &block)
end

def register(hook, obj=nil, &blk)

Register a callback for a given hook
def register(hook, obj=nil, &blk)
  if obj and blk
    raise "Specify either an object or a block, not both"
  end
  h = obj || blk
  @hooks[hook] << h
  h
end