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Name	Size	Permission	Date
cgi	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
date	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
digest	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
dl	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
drb	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
fiddle	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
irb	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
json	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
matrix	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
net	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
openssl	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
optparse	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
psych	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
racc	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
rake	[ DIR ]	drwxr-xr-x	2024-03-03 22:53
rbconfig	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
rdoc	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
rexml	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
rinda	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
ripper	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
rss	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
rubygems	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
shell	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
syslog	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
test	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
uri	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
webrick	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
x86_64-linux	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
xmlrpc	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
yaml	[ DIR ]	drwxr-xr-x	2024-03-03 22:43
English.rb	6.44 KB	-rw-r--r--	2013-02-04 02:50
abbrev.rb	3.31 KB	-rw-r--r--	2013-02-24 05:06
base64.rb	2.63 KB	-rw-r--r--	2009-10-02 10:45
benchmark.rb	17.94 KB	-rw-r--r--	2012-07-18 03:56
cgi.rb	9.39 KB	-rw-r--r--	2012-11-30 05:06
cmath.rb	7.22 KB	-rw-r--r--	2011-07-23 12:14
complex.rb	380 B	-rw-r--r--	2009-08-16 15:34
csv.rb	81.32 KB	-rw-r--r--	2014-09-17 05:56
date.rb	946 B	-rw-r--r--	2023-07-26 14:09
debug.rb	28.9 KB	-rw-r--r--	2013-02-02 05:04
delegate.rb	9.78 KB	-rw-r--r--	2014-04-30 07:45
digest.rb	2.24 KB	-rw-r--r--	2023-07-26 14:09
dl.rb	280 B	-rw-r--r--	2023-07-26 14:09
drb.rb	19 B	-rw-r--r--	2009-10-02 10:45
e2mmap.rb	3.8 KB	-rw-r--r--	2011-05-19 00:07
erb.rb	26.08 KB	-rw-r--r--	2014-09-03 04:42
expect.rb	2.14 KB	-rw-r--r--	2023-07-26 14:09
fiddle.rb	1.25 KB	-rw-r--r--	2023-07-26 14:09
fileutils.rb	46.35 KB	-rw-r--r--	2014-10-16 07:23
find.rb	2.08 KB	-rw-r--r--	2012-09-20 07:14
forwardable.rb	7.56 KB	-rw-r--r--	2013-01-04 02:52
getoptlong.rb	15.38 KB	-rw-r--r--	2013-12-24 15:46
gserver.rb	8.86 KB	-rw-r--r--	2014-07-07 03:55
ipaddr.rb	26.17 KB	-rw-r--r--	2013-02-23 04:03
irb.rb	20.03 KB	-rw-r--r--	2013-02-05 15:57
json.rb	1.74 KB	-rw-r--r--	2023-07-26 14:09
kconv.rb	5.74 KB	-rw-r--r--	2023-07-26 14:09
logger.rb	20.96 KB	-rw-r--r--	2013-07-13 15:16
mathn.rb	6.52 KB	-rw-r--r--	2011-08-26 22:22
matrix.rb	45.02 KB	-rw-r--r--	2013-02-05 05:43
mkmf.rb	78.19 KB	-rw-r--r--	2023-07-26 14:06
monitor.rb	6.93 KB	-rw-r--r--	2012-11-16 16:55
mutex_m.rb	2 KB	-rw-r--r--	2013-02-24 04:49
observer.rb	5.71 KB	-rw-r--r--	2012-08-21 13:03
open-uri.rb	23.66 KB	-rw-r--r--	2014-02-16 17:02
open3.rb	21.17 KB	-rw-r--r--	2013-01-13 04:40
openssl.rb	528 B	-rw-r--r--	2023-07-26 14:09
optparse.rb	51.27 KB	-rw-r--r--	2014-02-19 16:38
ostruct.rb	7.64 KB	-rw-r--r--	2012-10-28 21:20
pathname.rb	15.3 KB	-rw-r--r--	2023-07-26 14:09
pp.rb	13.14 KB	-rw-r--r--	2012-08-15 11:50
prettyprint.rb	9.63 KB	-rw-r--r--	2011-08-02 15:25
prime.rb	13.98 KB	-rw-r--r--	2013-01-13 05:07
profile.rb	205 B	-rw-r--r--	2009-10-02 10:45
profiler.rb	4.29 KB	-rw-r--r--	2013-02-03 00:38
pstore.rb	14.85 KB	-rw-r--r--	2012-11-11 04:23
psych.rb	9.9 KB	-rw-r--r--	2023-07-26 14:09
rake.rb	2.07 KB	-rw-r--r--	2012-11-29 19:16
rational.rb	308 B	-rw-r--r--	2009-09-24 00:42
rdoc.rb	4.88 KB	-rw-r--r--	2013-02-19 05:06
resolv-replace.rb	1.73 KB	-rw-r--r--	2013-04-03 17:27
resolv.rb	61.45 KB	-rw-r--r--	2015-06-01 15:13
ripper.rb	2.53 KB	-rw-r--r--	2023-07-26 14:09
rss.rb	2.84 KB	-rw-r--r--	2011-05-11 10:22
rubygems.rb	27.53 KB	-rw-r--r--	2023-07-26 14:06
scanf.rb	23.52 KB	-rw-r--r--	2011-11-05 07:37
securerandom.rb	8.56 KB	-rw-r--r--	2012-09-13 13:01
set.rb	17.32 KB	-rw-r--r--	2012-11-24 18:51
shell.rb	10.3 KB	-rw-r--r--	2012-12-05 02:55
shellwords.rb	5.94 KB	-rw-r--r--	2012-11-09 06:28
singleton.rb	4.02 KB	-rw-r--r--	2011-05-18 14:09
socket.rb	25.76 KB	-rw-r--r--	2023-07-26 14:09
sync.rb	7.26 KB	-rw-r--r--	2012-12-23 10:18
tempfile.rb	10.15 KB	-rw-r--r--	2013-10-09 16:11
thread.rb	6.94 KB	-rw-r--r--	2014-02-09 16:07
thwait.rb	3.38 KB	-rw-r--r--	2011-06-29 03:09
time.rb	21.09 KB	-rw-r--r--	2013-10-09 15:07
timeout.rb	3.16 KB	-rw-r--r--	2013-04-14 15:20
tmpdir.rb	4.15 KB	-rw-r--r--	2012-12-12 12:40
tracer.rb	6.54 KB	-rw-r--r--	2013-02-04 17:59
tsort.rb	6.79 KB	-rw-r--r--	2009-03-06 04:23
ubygems.rb	268 B	-rw-r--r--	2009-10-02 10:45
un.rb	8.34 KB	-rw-r--r--	2012-08-03 08:23
uri.rb	3.07 KB	-rw-r--r--	2011-05-13 20:03
weakref.rb	3.23 KB	-rw-r--r--	2012-12-02 07:57
webrick.rb	6.7 KB	-rw-r--r--	2012-11-07 06:49
xmlrpc.rb	8.49 KB	-rw-r--r--	2012-09-13 02:24
yaml.rb	2.3 KB	-rw-r--r--	2013-05-19 19:01

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 observers must implement a method called +update+ to receive
# notifications.
#
# The observable object must:
# * assert that it has +#changed+
# * call +#notify_observers+
#
# === 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
#       lastPrice = nil
#       loop do
#         price = Price.fetch(@symbol)
#         print "Current price: #{price}\n"
#         if price != lastPrice
#           changed                 # notify observers
#           lastPrice = 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 Price.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.to_s}'"
    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