ruby-processing: Perform action on exit?

jaymcgavr..

ruby-processing: Perform action on exit?

in Processing with Other Languages • 3 years ago

I'm working on a DRb-based, Internet-enabled ruby-processing server, intended to be run with "rp5 live" (so you can live code with others). My current problem is that I can't seem to execute code to disconnect from the server when the Processing::App subclass quits. I've tried overriding stop() and close(); neither seems to get called. I've even tried key_pressed(event) and disconnecting if event.key_code == 27 (Escape), but that then seems to prevent Escape from closing the window (as it normally does).

Is there a recommended way to run code on exit? A kludge I can use?

Here's my current code:

require File.expand_path(File.join(File.dirname(__FILE__), '..', 'lib', 'drb-processing', 'client'))
require 'logger'
class Sketch < Processing::App
def setup
$client = DRbProcessing::Client.new(self)
$client.logger = Logger.new(STDOUT)
$client.connect ARGV[0]
end
def draw
end
def key_pressed(key)
$client.disconnect if key.key_code == 27 #Escape
end
end
sketch = Sketch.new(:width => 640, :height => 480, :title => '', :full_screen => false)

Many thanks for any help anyone can offer!

Replies(3)

monkstone

Re: ruby-processing: Perform action on exit?

3 years ago

I would have thought you needed to create a multi-threaded solution?

jashkenas

Re: ruby-processing: Perform action on exit?

3 years ago

Ruby has a neat `at_exit` callback you can take advantage of, to run code that should be executed at shutdown. Unfortunately -- I tried it, and it doesn't seem to work correctly in JRuby ... getting called too early.

jaymcgavr..

Re: Re: ruby-processing: Perform action on exit?

3 years ago

I got the same result with at_exit, and END {} as well. Not sure why.

I wound up intercepting clicks of the Close button, the Escape key on the enclosing JFrame (for when you haven't clicked inside the window), and *again* on the JApplet (for when you *have* clicked inside the window). And that *still* doesn't cover choosing Quit from the menu, so I'll have to look into that later. :P If anyone knows of a single callback that will handle all of this, I'd like to hear about it.

require File.expand_path(File.join(File.dirname(__FILE__), '..', 'lib', 'drb-processing', 'client'))
java_import 'java.awt.event.WindowEvent'
java_import 'java.awt.event.KeyEvent'
require 'logger'
class Sketch < Processing::App
def setup
$client = DRbProcessing::Client.new(self)
$client.logger = Logger.new(STDOUT)
$client.connect ARGV[0]
end
def draw
end
def close
$client.disconnect
super
end
def determine_how_to_display(*args)
super
if @frame
@frame.add_window_listener do |event|
if event.id == WindowEvent::WINDOW_CLOSING
close
end
end
@frame.add_key_listener do |event|
if event.key_code == KeyEvent::VK_ESCAPE
close
end
end
end
end
def handleKeyEvent(event) #Not snake_case, we need to override an existing Java method!
if event.key_code == KeyEvent::VK_ESCAPE
close
end
super
end
end
sketch = Sketch.new(:width => 640, :height => 480, :title => '', :full_screen => false)

This is tested only on Snow Leopard, I'll try Windows and Xfce (Linux) soon. Should work in both full-screen and windowed modes.

Side note - the server is about ready for alpha testing. Project is available on Github. E-mail me (jay at mylastname.com) if you'd like to help with an Internet-based test.

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