Class: Processing::Watcher

Inherits:
Object
  • Object
show all
Defined in:
lib/ruby-processing/runners/watch.rb

Overview

A sketch loader, observer, and reloader, to tighten the feedback between code and effect.

Constant Summary collapse

SLEEP_TIME = 
0.2

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Watcher

Returns a new instance of Watcher.



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# File 'lib/ruby-processing/runners/watch.rb', line 18

def initialize
  reload_files_to_watch
  @time = Time.now
  start_watching
end

Instance Method Details

#reload_files_to_watch ⇒ Object 



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# File 'lib/ruby-processing/runners/watch.rb', line 61

def reload_files_to_watch
  @files = Dir.glob(File.join(SKETCH_ROOT, '**/*.{rb,glsl}'))
  count = @files.length
  max_watch = RP_CONFIG.fetch('MAX_WATCH', 20)
  return unless count > max_watch
  warn format(WATCH_MESSAGE, max_watch, count)
  abort
end

#report_errors ⇒ Object

Convenience function to report errors when loading and running a sketch, instead of having them eaten by the thread they are loaded in.



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# File 'lib/ruby-processing/runners/watch.rb', line 43

def report_errors
  yield
rescue Exception => e
  wformat = 'Exception occured while running sketch %s...'
  tformat = "Backtrace:\n\t%s"
  warn format(wformat, File.basename(SKETCH_PATH))
  puts format(tformat, e.backtrace.join("\n\t"))
end

#start_runner ⇒ Object 



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# File 'lib/ruby-processing/runners/watch.rb', line 52

def start_runner
  @runner.kill if @runner && @runner.alive?
  @runner = Thread.start do
    report_errors do
      Processing.load_and_run_sketch
    end
  end
end

#start_watching ⇒ Object

Kicks off a thread to watch the sketch, reloading Ruby-Processing and restarting the sketch whenever it changes.



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# File 'lib/ruby-processing/runners/watch.rb', line 26

def start_watching
  start_runner
  Kernel.loop do
    if @files.find { |file| FileTest.exist?(file) && File.stat(file).mtime > @time }
      puts 'reloading sketch...'
      $app && $app.close
      @time = Time.now
      java.lang.System.gc
      start_runner
      reload_files_to_watch
    end
    sleep SLEEP_TIME
  end
end