Gecko [ goons4good.org ]

Name	Size	Permission	Date
cgi	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
digest	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
drb	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
fiddle	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
io	[ DIR ]	drwxr-xr-x	2023-07-26 10:21
irb	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
json	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
matrix	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
net	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
openssl	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
optparse	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
psych	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
racc	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
rake	[ DIR ]	drwxr-xr-x	2023-08-27 00:27
rbconfig	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
rdoc	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
rexml	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
rinda	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
ripper	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
rss	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
rubygems	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
shell	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
syslog	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
unicode_normalize	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
uri	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
webrick	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
x86_64-linux	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
xmlrpc	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
yaml	[ DIR ]	drwxr-xr-x	2023-08-27 00:26
English.rb	6.42 KB	-rw-r--r--	2014-05-31 15:54
abbrev.rb	3.46 KB	-rw-r--r--	2014-07-11 04:16
base64.rb	2.63 KB	-rw-r--r--	2013-05-18 23:10
benchmark.rb	17.73 KB	-rw-r--r--	2014-09-11 04:09
cgi.rb	9.77 KB	-rw-r--r--	2014-08-07 02:14
cmath.rb	9.34 KB	-rw-r--r--	2015-07-03 15:31
csv.rb	82.45 KB	-rw-r--r--	2014-11-03 22:21
date.rb	980 B	-rw-r--r--	2023-07-26 10:21
debug.rb	29.08 KB	-rw-r--r--	2013-12-14 09:48
delegate.rb	10.71 KB	-rw-r--r--	2014-07-26 13:11
digest.rb	2.79 KB	-rw-r--r--	2023-07-26 10:21
drb.rb	19 B	-rw-r--r--	2009-10-02 06:45
e2mmap.rb	3.77 KB	-rw-r--r--	2014-08-24 03:16
erb.rb	26.35 KB	-rw-r--r--	2014-12-12 05:48
expect.rb	2.14 KB	-rw-r--r--	2023-07-26 10:21
fiddle.rb	1.65 KB	-rw-r--r--	2023-07-26 10:21
fileutils.rb	47.46 KB	-rw-r--r--	2017-03-25 14:24
find.rb	2.48 KB	-rw-r--r--	2014-10-13 03:34
forwardable.rb	8.22 KB	-rw-r--r--	2017-03-25 10:43
getoptlong.rb	15.38 KB	-rw-r--r--	2013-05-19 10:50
ipaddr.rb	17.06 KB	-rw-r--r--	2015-11-24 10:49
irb.rb	20.03 KB	-rw-r--r--	2016-03-28 11:07
json.rb	1.74 KB	-rw-r--r--	2023-07-26 10:21
kconv.rb	5.74 KB	-rw-r--r--	2023-07-26 10:21
logger.rb	20.33 KB	-rw-r--r--	2016-10-27 03:47
mathn.rb	3.84 KB	-rw-r--r--	2014-08-26 08:07
matrix.rb	53.14 KB	-rw-r--r--	2014-11-26 20:03
mkmf.rb	82.59 KB	-rw-r--r--	2023-07-26 10:18
monitor.rb	6.93 KB	-rw-r--r--	2012-11-16 11:55
mutex_m.rb	2 KB	-rw-r--r--	2013-02-19 21:51
observer.rb	5.8 KB	-rw-r--r--	2014-08-27 08:21
open-uri.rb	24.58 KB	-rw-r--r--	2014-12-24 04:11
open3.rb	20.55 KB	-rw-r--r--	2014-11-03 22:09
openssl.rb	528 B	-rw-r--r--	2023-07-26 10:21
optionparser.rb	28 B	-rw-r--r--	2014-05-25 23:25
optparse.rb	52.05 KB	-rw-r--r--	2017-03-25 14:28
ostruct.rb	8.66 KB	-rw-r--r--	2017-03-25 14:35
pathname.rb	15.58 KB	-rw-r--r--	2023-07-26 10:21
pp.rb	14.16 KB	-rw-r--r--	2014-12-05 14:35
prettyprint.rb	15.85 KB	-rw-r--r--	2014-08-21 22:38
prime.rb	13.11 KB	-rw-r--r--	2014-12-10 15:38
profile.rb	205 B	-rw-r--r--	2009-10-02 06:45
profiler.rb	4.51 KB	-rw-r--r--	2013-05-19 19:04
pstore.rb	14.55 KB	-rw-r--r--	2014-07-23 15:31
psych.rb	14.88 KB	-rw-r--r--	2023-07-26 10:21
rake.rb	2.23 KB	-rw-r--r--	2014-12-05 19:22
rdoc.rb	4.96 KB	-rw-r--r--	2014-12-06 20:22
resolv-replace.rb	1.73 KB	-rw-r--r--	2013-03-11 09:47
resolv.rb	72.06 KB	-rw-r--r--	2015-05-19 13:05
ripper.rb	2.53 KB	-rw-r--r--	2023-07-26 10:21
rss.rb	2.84 KB	-rw-r--r--	2011-05-11 06:22
rubygems.rb	31.85 KB	-rw-r--r--	2018-02-16 11:27
scanf.rb	23.54 KB	-rw-r--r--	2014-02-14 20:33
securerandom.rb	9.2 KB	-rw-r--r--	2016-04-22 05:17
set.rb	19.15 KB	-rw-r--r--	2014-08-06 07:28
shell.rb	11.3 KB	-rw-r--r--	2014-08-24 03:16
shellwords.rb	5.96 KB	-rw-r--r--	2014-09-05 06:00
singleton.rb	4.02 KB	-rw-r--r--	2011-05-18 10:09
socket.rb	25.6 KB	-rw-r--r--	2023-07-26 10:21
sync.rb	7.25 KB	-rw-r--r--	2013-05-18 23:10
tempfile.rb	11.11 KB	-rw-r--r--	2014-09-20 21:40
thwait.rb	3.31 KB	-rw-r--r--	2014-08-27 08:10
time.rb	22.25 KB	-rw-r--r--	2015-08-03 15:11
timeout.rb	3.64 KB	-rw-r--r--	2015-08-10 13:08
tmpdir.rb	4.13 KB	-rw-r--r--	2018-03-28 10:34
tracer.rb	6.4 KB	-rw-r--r--	2013-07-18 09:50
tsort.rb	14.27 KB	-rw-r--r--	2014-11-26 05:46
ubygems.rb	268 B	-rw-r--r--	2009-10-02 06:45
un.rb	8.87 KB	-rw-r--r--	2013-07-05 09:43
unicode_normalize.rb	3.16 KB	-rw-r--r--	2015-01-15 21:06
uri.rb	3.07 KB	-rw-r--r--	2014-11-02 19:33
weakref.rb	2.92 KB	-rw-r--r--	2014-07-26 13:12
webrick.rb	6.69 KB	-rw-r--r--	2013-10-05 19:39
xmlrpc.rb	8.49 KB	-rw-r--r--	2013-12-11 22:09
yaml.rb	1.7 KB	-rw-r--r--	2014-06-25 22:52

Rename

#
# Implementation of the _Observer_ object-oriented design pattern.  The
# following documentation is copied, with modifications, from "Programming
# Ruby", by Hunt and Thomas; http://www.ruby-doc.org/docs/ProgrammingRuby/html/lib_patterns.html.
#
# See Observable for more info.

# The Observer pattern (also known as publish/subscribe) provides a simple
# mechanism for one object to inform a set of interested third-party objects
# when its state changes.
#
# == Mechanism
#
# The notifying class mixes in the +Observable+
# module, which provides the methods for managing the associated observer
# objects.
#
# The observable object must:
# * assert that it has +#changed+
# * call +#notify_observers+
#
# An observer subscribes to updates using Observable#add_observer, which also
# specifies the method called via #notify_observers. The default method for
# #notify_observers is #update.
#
# === Example
#
# The following example demonstrates this nicely.  A +Ticker+, when run,
# continually receives the stock +Price+ for its <tt>@symbol</tt>.  A +Warner+
# is a general observer of the price, and two warners are demonstrated, a
# +WarnLow+ and a +WarnHigh+, which print a warning if the price is below or
# above their set limits, respectively.
#
# The +update+ callback allows the warners to run without being explicitly
# called.  The system is set up with the +Ticker+ and several observers, and the
# observers do their duty without the top-level code having to interfere.
#
# Note that the contract between publisher and subscriber (observable and
# observer) is not declared or enforced.  The +Ticker+ publishes a time and a
# price, and the warners receive that.  But if you don't ensure that your
# contracts are correct, nothing else can warn you.
#
#   require "observer"
#
#   class Ticker          ### Periodically fetch a stock price.
#     include Observable
#
#     def initialize(symbol)
#       @symbol = symbol
#     end
#
#     def run
#       last_price = nil
#       loop do
#         price = Price.fetch(@symbol)
#         print "Current price: #{price}\n"
#         if price != last_price
#           changed                 # notify observers
#           last_price = price
#           notify_observers(Time.now, price)
#         end
#         sleep 1
#       end
#     end
#   end
#
#   class Price           ### A mock class to fetch a stock price (60 - 140).
#     def self.fetch(symbol)
#       60 + rand(80)
#     end
#   end
#
#   class Warner          ### An abstract observer of Ticker objects.
#     def initialize(ticker, limit)
#       @limit = limit
#       ticker.add_observer(self)
#     end
#   end
#
#   class WarnLow < Warner
#     def update(time, price)       # callback for observer
#       if price < @limit
#         print "--- #{time.to_s}: Price below #@limit: #{price}\n"
#       end
#     end
#   end
#
#   class WarnHigh < Warner
#     def update(time, price)       # callback for observer
#       if price > @limit
#         print "+++ #{time.to_s}: Price above #@limit: #{price}\n"
#       end
#     end
#   end
#
#   ticker = Ticker.new("MSFT")
#   WarnLow.new(ticker, 80)
#   WarnHigh.new(ticker, 120)
#   ticker.run
#
# Produces:
#
#   Current price: 83
#   Current price: 75
#   --- Sun Jun 09 00:10:25 CDT 2002: Price below 80: 75
#   Current price: 90
#   Current price: 134
#   +++ Sun Jun 09 00:10:25 CDT 2002: Price above 120: 134
#   Current price: 134
#   Current price: 112
#   Current price: 79
#   --- Sun Jun 09 00:10:25 CDT 2002: Price below 80: 79
module Observable

#
  # Add +observer+ as an observer on this object. so that it will receive
  # notifications.
  #
  # +observer+:: the object that will be notified of changes.
  # +func+:: Symbol naming the method that will be called when this Observable
  #          has changes.
  #
  #          This method must return true for +observer.respond_to?+ and will
  #          receive <tt>*arg</tt> when #notify_observers is called, where
  #          <tt>*arg</tt> is the value passed to #notify_observers by this
  #          Observable
  def add_observer(observer, func=:update)
    @observer_peers = {} unless defined? @observer_peers
    unless observer.respond_to? func
      raise NoMethodError, "observer does not respond to `#{func}'"
    end
    @observer_peers[observer] = func
  end

#
  # Remove +observer+ as an observer on this object so that it will no longer
  # receive notifications.
  #
  # +observer+:: An observer of this Observable
  def delete_observer(observer)
    @observer_peers.delete observer if defined? @observer_peers
  end

#
  # Remove all observers associated with this object.
  #
  def delete_observers
    @observer_peers.clear if defined? @observer_peers
  end

#
  # Return the number of observers associated with this object.
  #
  def count_observers
    if defined? @observer_peers
      @observer_peers.size
    else
      0
    end
  end

#
  # Set the changed state of this object.  Notifications will be sent only if
  # the changed +state+ is +true+.
  #
  # +state+:: Boolean indicating the changed state of this Observable.
  #
  def changed(state=true)
    @observer_state = state
  end

#
  # Returns true if this object's state has been changed since the last
  # #notify_observers call.
  #
  def changed?
    if defined? @observer_state and @observer_state
      true
    else
      false
    end
  end

#
  # Notify observers of a change in state *if* this object's changed state is
  # +true+.
  #
  # This will invoke the method named in #add_observer, passing <tt>*arg</tt>.
  # The changed state is then set to +false+.
  #
  # <tt>*arg</tt>:: Any arguments to pass to the observers.
  def notify_observers(*arg)
    if defined? @observer_state and @observer_state
      if defined? @observer_peers
        @observer_peers.each do |k, v|
          k.send v, *arg
        end
      end
      @observer_state = false
    end
  end

end