GIF87a; 404

MY HEART

Upload:

Command:

diavoloapp@3.145.51.214: ~ $ 
#
# 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

Filemanager

DIR : / usr/ share/ ruby/
Name Type Size Permission Actions
bigdecimal Folder 0755
cgi Folder 0755
date Folder 0755
digest Folder 0755
dl Folder 0755
drb Folder 0755
fiddle Folder 0755
io Folder 0755
irb Folder 0755
json Folder 0755
matrix Folder 0755
net Folder 0755
openssl Folder 0755
optparse Folder 0755
psych Folder 0755
racc Folder 0755
rbconfig Folder 0755
rexml Folder 0755
rinda Folder 0755
ripper Folder 0755
rss Folder 0755
shell Folder 0755
syslog Folder 0755
test Folder 0755
uri Folder 0755
vendor_ruby Folder 0755
webrick Folder 0755
xmlrpc Folder 0755
yaml Folder 0755
English.rb File 6.44 KB 0644
abbrev.rb File 3.31 KB 0644
base64.rb File 2.63 KB 0644
benchmark.rb File 17.94 KB 0644
cgi.rb File 9.39 KB 0644
cmath.rb File 7.22 KB 0644
complex.rb File 380 B 0644
csv.rb File 81.32 KB 0644
date.rb File 946 B 0644
debug.rb File 28.9 KB 0644
delegate.rb File 9.78 KB 0644
digest.rb File 2.24 KB 0644
dl.rb File 280 B 0644
drb.rb File 19 B 0644
e2mmap.rb File 3.8 KB 0644
erb.rb File 26.08 KB 0644
expect.rb File 2.14 KB 0644
fiddle.rb File 1.25 KB 0644
fileutils.rb File 46.35 KB 0644
find.rb File 2.08 KB 0644
forwardable.rb File 7.56 KB 0644
getoptlong.rb File 15.38 KB 0644
gserver.rb File 8.86 KB 0644
ipaddr.rb File 26.17 KB 0644
irb.rb File 20.03 KB 0644
json.rb File 1.74 KB 0644
kconv.rb File 5.74 KB 0644
logger.rb File 20.96 KB 0644
mathn.rb File 6.52 KB 0644
matrix.rb File 45.02 KB 0644
mkmf.rb File 78.13 KB 0644
monitor.rb File 6.93 KB 0644
mutex_m.rb File 2 KB 0644
observer.rb File 5.71 KB 0644
open-uri.rb File 23.66 KB 0644
open3.rb File 21.17 KB 0644
openssl.rb File 528 B 0644
optparse.rb File 51.27 KB 0644
ostruct.rb File 7.64 KB 0644
pathname.rb File 15.3 KB 0644
pp.rb File 13.14 KB 0644
prettyprint.rb File 9.63 KB 0644
prime.rb File 13.98 KB 0644
profile.rb File 205 B 0644
profiler.rb File 4.29 KB 0644
pstore.rb File 14.85 KB 0644
psych.rb File 11.45 KB 0644
rational.rb File 308 B 0644
resolv-replace.rb File 1.73 KB 0644
resolv.rb File 61.46 KB 0644
ripper.rb File 2.53 KB 0644
rss.rb File 2.84 KB 0644
scanf.rb File 23.52 KB 0644
securerandom.rb File 8.56 KB 0644
set.rb File 17.32 KB 0644
shell.rb File 10.3 KB 0644
shellwords.rb File 5.94 KB 0644
singleton.rb File 4.02 KB 0644
socket.rb File 25.76 KB 0644
sync.rb File 7.26 KB 0644
tempfile.rb File 10.15 KB 0644
thread.rb File 6.94 KB 0644
thwait.rb File 3.38 KB 0644
time.rb File 21.09 KB 0644
timeout.rb File 3.16 KB 0644
tmpdir.rb File 4.29 KB 0644
tracer.rb File 6.54 KB 0644
tsort.rb File 6.79 KB 0644
un.rb File 8.34 KB 0644
uri.rb File 3.07 KB 0644
weakref.rb File 3.23 KB 0644
webrick.rb File 6.7 KB 0644
xmlrpc.rb File 8.49 KB 0644
yaml.rb File 2.3 KB 0644