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require "delegate"

# Weak Reference class that allows a referenced object to be
# garbage-collected.
#
# A WeakRef may be used exactly like the object it references.
#
# Usage:
#
#   foo = Object.new            # create a new object instance
#   p foo.to_s                  # original's class
#   foo = WeakRef.new(foo)      # reassign foo with WeakRef instance
#   p foo.to_s                  # should be same class
#   GC.start                    # start the garbage collector
#   p foo.to_s                  # should raise exception (recycled)
#
# == Example
#
# With help from WeakRef, we can implement our own redimentary WeakHash class.
#
# We will call it WeakHash, since it's really just a Hash except all of it's
# keys and values can be garbage collected.
#
#     require 'weakref'
#
#     class WeakHash < Hash
#       def []= key, obj
#         super WeakRef.new(key), WeakRef.new(obj)
#       end
#     end
#
# This is just a simple implementation, we've opened the Hash class and changed
# Hash#store to create a new WeakRef object with +key+ and +obj+ parameters
# before passing them as our key-value pair to the hash.
#
# With this you will have to limit your self to String key's, otherwise you
# will get an ArgumentError because WeakRef cannot create a finalizer for a
# Symbol. Symbols are immutable and cannot be garbage collected.
#
# Let's see it in action:
#
#   omg = "lol"
#   c = WeakHash.new
#   c['foo'] = "bar"
#   c['baz'] = Object.new
#   c['qux'] = omg
#   puts c.inspect
#   #=> {"foo"=>"bar", "baz"=>#<Object:0x007f4ddfc6cb48>, "qux"=>"lol"}
#
#   # Now run the garbage collector
#   GC.start
#   c['foo'] #=> nil
#   c['baz'] #=> nil
#   c['qux'] #=> nil
#   omg      #=> "lol"
#
#   puts c.inspect
#   #=> WeakRef::RefError: Invalid Reference - probably recycled
#
# You can see the local variable +omg+ stayed, although it's reference in our
# hash object was garbage collected, along with the rest of the keys and
# values. Also, when we tried to inspect our hash, we got a WeakRef::RefError,
# this is because these objects were also garbage collected.

class WeakRef < Delegator

  ##
  # RefError is raised when a referenced object has been recycled by the
  # garbage collector

  class RefError < StandardError
  end

  @@__map = ::ObjectSpace::WeakMap.new

  ##
  # Creates a weak reference to +orig+
  #
  # Raises an ArgumentError if the given +orig+ is immutable, such as Symbol,
  # Fixnum, or Float.

  def initialize(orig)
    case orig
    when true, false, nil
      @delegate_sd_obj = orig
    else
      @@__map[self] = orig
    end
    super
  end

  def __getobj__ # :nodoc:
    @@__map[self] or defined?(@delegate_sd_obj) ? @delegate_sd_obj :
      Kernel::raise(RefError, "Invalid Reference - probably recycled", Kernel::caller(2))
  end

  def __setobj__(obj) # :nodoc:
  end

  ##
  # Returns true if the referenced object is still alive.

  def weakref_alive?
    !!(@@__map[self] or defined?(@delegate_sd_obj))
  end
end

if __FILE__ == $0
#  require 'thread'
  foo = Object.new
  p foo.to_s                    # original's class
  foo = WeakRef.new(foo)
  p foo.to_s                    # should be same class
  ObjectSpace.garbage_collect
  ObjectSpace.garbage_collect
  p foo.to_s                    # should raise exception (recycled)
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