class MIDIOps::Handler

Public Class Methods

new() click to toggle source
# File lib/midiops/handler.rb, line 16
def initialize
  @handlers     = {}
  @events       = [] # pool for events not processed
  @handler_args = [] # args to pass to handler method
end

Public Instance Methods

add(event, handler) click to toggle source
# File lib/midiops/handler.rb, line 22
def add event, handler
  @handlers.set_by_keys event, handler
end
clear_state() click to toggle source
# File lib/midiops/handler.rb, line 46
def clear_state
  @events.clear
  @handler_args.clear
end
defer(handler, args=[]) click to toggle source
# File lib/midiops/handler.rb, line 42
def defer handler, args=[]
  EM.defer(Proc.new { handler.call(*args) }) unless handler.nil?
end
handle(event) click to toggle source
# File lib/midiops/handler.rb, line 51
def handle event
  @events << event

  case status
  when Status::HAS_HANDLER
    defer @handlers.get_by_keys(*@events), @handler_args.dup
    clear_state
  when Status::HAS_HANDLER_WITH_ARG
    @handler_args << event
    @events.pop
    @events << :ARG
    defer(
      @handlers.get_by_keys(*@events),
      @handler_args.dup
    )
    clear_state
  when Status::WAITING_ARG
    @handler_args << event
    @events.pop
    @events << :ARG
  when Status::NO_HANDLERS
    clear_state
  when Status::HANDLER_INDEFINITE
  end
end
status() click to toggle source
# File lib/midiops/handler.rb, line 26
def status
  if @handlers.get_by_keys(*@events).is_a? Proc
    Status::HAS_HANDLER
  elsif @handlers.get_by_keys(*(@events.take(@events.size - 1)), :ARG).is_a? Proc
    Status::HAS_HANDLER_WITH_ARG
  elsif @handlers.get_by_keys(*(@events.take(@events.size - 1)), :ARG).is_a? Hash
    Status::WAITING_ARG
  elsif @handlers.get_by_keys(*@events).is_a? Hash
    Status::HANDLER_INDEFINITE
  elsif @handlers.get_by_keys(*@events).nil?
    Status::NO_HANDLERS
  else
    raise RuntimeError, "Invalid handler status: #{self.inspect}"
  end
end