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RDoc documentation from Eric Hodel <drbrain@segment7.net> added.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@9459 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
seki
parent
141666b1e2
commit
def653cd80
4 changed files with 449 additions and 93 deletions
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@ -1,3 +1,8 @@
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Tue Oct 25 00:35:33 2005 Masatoshi SEKI <m_seki@mva.biglobe.ne.jp>
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* lib/rinda/*: RDoc documentation from Eric Hodel
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<drbrain@segment7.net> added.
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Mon Oct 24 21:14:29 2005 Nobuyoshi Nakada <nobu@ruby-lang.org>
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* configure.in, io.c: use sys/syscall.h if syscall.h is not available.
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@ -1,100 +1,150 @@
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#
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# rinda.rb: A Ruby implementation of the Linda distributed computing paradigm.
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#
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# <i>Introduction to Linda/rinda?</i>
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#
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# <i>Why is this library separate from <tt>drb</tt>?</i>
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#
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# <i>Example(s)</i>
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#
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# (See the samples directory in the Ruby distribution, from 1.8.2 onwards.)
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#
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require 'drb/drb'
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require 'thread'
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##
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# A module to implement the Linda distributed computing paradigm in Ruby.
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#
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# A module to implement the Linda programming paradigm in Ruby.
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# This is part of +drb+ (dRuby).
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# Rinda is part of DRb (dRuby).
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#
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# == Example(s)
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#
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# See the sample/drb/ directory in the Ruby distribution, from 1.8.2 onwards.
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#
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#--
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# TODO
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# == Introduction to Linda/rinda?
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#
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# == Why is this library separate from DRb?
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module Rinda
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##
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# Rinda error base class
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class RindaError < RuntimeError; end
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##
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# Raised when a hash-based tuple has an invalid key.
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class InvalidHashTupleKey < RindaError; end
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##
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# Raised when trying to use a canceled tuple.
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class RequestCanceledError < ThreadError; end
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##
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# Raised when trying to use an expired tuple.
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class RequestExpiredError < ThreadError; end
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#
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##
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# A tuple is the elementary object in Rinda programming.
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# Tuples may be matched against templates if the tuple and
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# the template are the same size.
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#
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class Tuple
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# Initialize a tuple with an Array or a Hash.
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##
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# Creates a new Tuple from +ary_or_hash+ which must be an Array or Hash.
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def initialize(ary_or_hash)
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if hash?(ary_or_hash)
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init_with_hash(ary_or_hash)
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init_with_hash(ary_or_hash)
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else
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init_with_ary(ary_or_hash)
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init_with_ary(ary_or_hash)
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end
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end
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##
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# The number of elements in the tuple.
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def size
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@tuple.size
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end
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##
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# Accessor method for elements of the tuple.
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def [](k)
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@tuple[k]
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end
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##
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# Fetches item +k+ from the tuple.
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def fetch(k)
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@tuple.fetch(k)
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end
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##
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# Iterate through the tuple, yielding the index or key, and the
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# value, thus ensuring arrays are iterated similarly to hashes.
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def each # FIXME
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if Hash === @tuple
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@tuple.each { |k, v| yield(k, v) }
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@tuple.each { |k, v| yield(k, v) }
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else
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@tuple.each_with_index { |v, k| yield(k, v) }
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@tuple.each_with_index { |v, k| yield(k, v) }
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end
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end
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# Return the tuple itself -- i.e the Array or hash.
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##
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# Return the tuple itself
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def value
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@tuple
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end
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private
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def hash?(ary_or_hash)
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ary_or_hash.respond_to?(:keys)
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end
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##
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# Munges +ary+ into a valid Tuple.
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def init_with_ary(ary)
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@tuple = Array.new(ary.size)
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@tuple.size.times do |i|
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@tuple[i] = ary[i]
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@tuple[i] = ary[i]
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end
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end
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##
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# Ensures +hash+ is a valid Tuple.
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def init_with_hash(hash)
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@tuple = Hash.new
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hash.each do |k, v|
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raise InvalidHashTupleKey unless String === k
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@tuple[k] = v
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@tuple[k] = v
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end
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end
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end
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#
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##
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# Templates are used to match tuples in Rinda.
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#
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class Template < Tuple
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# Perform the matching of a tuple against a template. An
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# element with a +nil+ value in a template acts as a wildcard,
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# matching any value in the corresponding position in the tuple.
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##
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# Matches this template against +tuple+. The +tuple+ must be the same
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# size as the template. An element with a +nil+ value in a template acts
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# as a wildcard, matching any value in the corresponding position in the
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# tuple. Elements of the template match the +tuple+ if the are #== or
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# #===.
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#
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# Template.new([:foo, 5]).match Tuple.new([:foo, 5]) # => true
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# Template.new([:foo, nil]).match Tuple.new([:foo, 5]) # => true
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# Template.new([String]).match Tuple.new(['hello']) # => true
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#
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# Template.new([:foo]).match Tuple.new([:foo, 5]) # => false
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# Template.new([:foo, 6]).match Tuple.new([:foo, 5]) # => false
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# Template.new([:foo, nil]).match Tuple.new([:foo]) # => false
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# Template.new([:foo, 6]).match Tuple.new([:foo]) # => false
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def match(tuple)
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return false unless tuple.respond_to?(:size)
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return false unless tuple.respond_to?(:fetch)
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@ -105,84 +155,129 @@ module Rinda
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rescue
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return false
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end
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next if v.nil?
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next if v.nil?
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next if v == it
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next if v === it
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return false
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return false
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end
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return true
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end
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##
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# Alias for #match.
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def ===(tuple)
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match(tuple)
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end
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end
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#
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##
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# <i>Documentation?</i>
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#
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class DRbObjectTemplate
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##
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# Creates a new DRbObjectTemplate that will match against +uri+ and +ref+.
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def initialize(uri=nil, ref=nil)
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@drb_uri = uri
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@drb_ref = ref
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end
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##
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# This DRbObjectTemplate matches +ro+ if the remote object's drburi and
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# drbref are the same. +nil+ is used as a wildcard.
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def ===(ro)
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return true if super(ro)
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unless @drb_uri.nil?
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return false unless (@drb_uri === ro.__drburi rescue false)
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return false unless (@drb_uri === ro.__drburi rescue false)
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end
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unless @drb_ref.nil?
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return false unless (@drb_ref === ro.__drbref rescue false)
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return false unless (@drb_ref === ro.__drbref rescue false)
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end
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true
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end
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end
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#
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##
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# TupleSpaceProxy allows a remote Tuplespace to appear as local.
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#
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class TupleSpaceProxy
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##
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# Creates a new TupleSpaceProxy to wrap +ts+.
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def initialize(ts)
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@ts = ts
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end
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##
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# Adds +tuple+ to the proxied TupleSpace. See TupleSpace#write.
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def write(tuple, sec=nil)
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@ts.write(tuple, sec)
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end
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##
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# Takes +tuple+ from the proxied TupleSpace. See TupleSpace#take.
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def take(tuple, sec=nil, &block)
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port = []
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@ts.move(DRbObject.new(port), tuple, sec, &block)
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port[0]
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end
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##
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# Reads +tuple+ from the proxied TupleSpace. See TupleSpace#read.
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def read(tuple, sec=nil, &block)
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@ts.read(tuple, sec, &block)
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end
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##
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# Reads all tuples matching +tuple+ from the proxied TupleSpace. See
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# TupleSpace#read_all.
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def read_all(tuple)
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@ts.read_all(tuple)
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end
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##
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# Registers for notifications of event +ev+ on the proxied TupleSpace.
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# See TupleSpace#notify
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def notify(ev, tuple, sec=nil)
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@ts.notify(ev, tuple, sec)
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end
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end
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#
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# <i>Documentation?</i>
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#
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##
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# An SimpleRenewer allows a TupleSpace to check if a TupleEntry is still
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# alive.
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class SimpleRenewer
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include DRbUndumped
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##
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# Creates a new SimpleRenewer that keeps an object alive for another +sec+
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# seconds.
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def initialize(sec=180)
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@sec = sec
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end
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##
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# Called by the TupleSpace to check if the object is still alive.
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def renew
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@sec
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end
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end
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end
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|
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@ -6,10 +6,29 @@ require 'rinda/rinda'
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require 'thread'
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module Rinda
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##
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# The default port Ring discovery will use.
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Ring_PORT = 7647
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##
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# A RingServer allows a Rinda::TupleSpace to be located via UDP broadcasts.
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# Service location uses the following steps:
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#
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# 1. A RingServer begins listening on the broadcast UDP address.
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# 2. A RingFinger sends a UDP packet containing the DRb URI where it will
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# listen for a reply.
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# 3. The RingServer recieves the UDP packet and connects back to the
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# provided DRb URI with the DRb service.
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class RingServer
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include DRbUndumped
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##
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# Advertises +ts+ on the UDP broadcast address at +port+.
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def initialize(ts, port=Ring_PORT)
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@ts = ts
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@soc = UDPSocket.open
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@ -18,6 +37,10 @@ module Rinda
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@r_service = reply_service
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end
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##
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# Creates a thread that picks up UDP packets and passes them to do_write
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# for decoding.
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def write_service
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Thread.new do
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loop do
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|
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@ -27,6 +50,10 @@ module Rinda
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end
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end
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##
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# Extracts the response URI from +msg+ and adds it to TupleSpace where it
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# will be picked up by +reply_service+ for notification.
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def do_write(msg)
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Thread.new do
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begin
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|
|
@ -37,6 +64,9 @@ module Rinda
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end
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end
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##
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# Creates a thread that notifies waiting clients from the TupleSpace.
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def reply_service
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Thread.new do
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loop do
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|
|
@ -45,15 +75,34 @@ module Rinda
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|||
end
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||||
end
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##
|
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# Pulls lookup tuples out of the TupleSpace and sends their DRb object the
|
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# address of the local TupleSpace.
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|
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def do_reply
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tuple = @ts.take([:lookup_ring, DRbObject])
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Thread.new { tuple[1].call(@ts) rescue nil}
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rescue
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end
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||||
end
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##
|
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# RingFinger is used by RingServer clients to discover the RingServer's
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# TupleSpace. Typically, all a client needs to do is call
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# RingFinger.primary to retrieve the remote TupleSpace, which it can then
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# begin using.
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class RingFinger
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@@broadcast_list = ['<broadcast>', 'localhost']
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@@finger = nil
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##
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# Creates a singleton RingFinger and looks for a RingServer. Returns the
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# created RingFinger.
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||||
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def self.finger
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unless @@finger
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@@finger = self.new
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|
@ -62,27 +111,56 @@ module Rinda
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@@finger
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end
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##
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# Returns the first advertised TupleSpace.
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def self.primary
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finger.primary
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end
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##
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# Contains all discoverd TupleSpaces except for the primary.
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||||
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def self.to_a
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finger.to_a
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end
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@@broadcast_list = ['<broadcast>', 'localhost']
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##
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# The list of addresses where RingFinger will send query packets.
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attr_accessor :broadcast_list
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||||
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||||
##
|
||||
# The port that RingFinger will send query packets to.
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attr_accessor :port
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||||
##
|
||||
# Contain the first advertised TupleSpace after lookup_ring_any is called.
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||||
attr_accessor :primary
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||||
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||||
##
|
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# Creates a new RingFinger that will look for RingServers at +port+ on
|
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# the addresses in +broadcast_list+.
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||||
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||||
def initialize(broadcast_list=@@broadcast_list, port=Ring_PORT)
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@broadcast_list = broadcast_list || ['localhost']
|
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@port = port
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@primary = nil
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@rings = []
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||||
end
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||||
attr_accessor :broadcast_list, :port, :primary
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||||
|
||||
##
|
||||
# Contains all discovered TupleSpaces except for the primary.
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||||
|
||||
def to_a
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@rings
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||||
end
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||||
|
||||
##
|
||||
# Iterates over all discovered TupleSpaces starting with the primary.
|
||||
|
||||
def each
|
||||
lookup_ring_any unless @primary
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||||
return unless @primary
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||||
|
|
@ -90,6 +168,11 @@ module Rinda
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|||
@rings.each { |x| yield(x) }
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||||
end
|
||||
|
||||
##
|
||||
# Looks up RingServers waiting +timeout+ seconds. RingServers will be
|
||||
# given +block+ as a callback, which will be called with the remote
|
||||
# TupleSpace.
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||||
|
||||
def lookup_ring(timeout=5, &block)
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||||
return lookup_ring_any(timeout) unless block_given?
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||||
|
||||
|
|
@ -108,6 +191,10 @@ module Rinda
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|||
sleep(timeout)
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||||
end
|
||||
|
||||
##
|
||||
# Returns the first found remote TupleSpace. Any further recovered
|
||||
# TupleSpaces can be found by calling +to_a+.
|
||||
|
||||
def lookup_ring_any(timeout=5)
|
||||
queue = Queue.new
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||||
|
||||
|
|
@ -125,19 +212,38 @@ module Rinda
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|||
raise('RingNotFound') if @primary.nil?
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||||
@primary
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||||
end
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||||
|
||||
end
|
||||
|
||||
##
|
||||
# RingProvider uses a RingServer advertised TupleSpace as a name service.
|
||||
# TupleSpace clients can register themselves with the remote TupleSpace and
|
||||
# look up other provided services via the remote TupleSpace.
|
||||
#
|
||||
# Services are registered with a tuple of the format [:name, klass,
|
||||
# DRbObject, description].
|
||||
|
||||
class RingProvider
|
||||
|
||||
##
|
||||
# Creates a RingProvider that will provide a +klass+ service running on
|
||||
# +front+, with a +description+. +renewer+ is optional.
|
||||
|
||||
def initialize(klass, front, desc, renewer = nil)
|
||||
@tuple = [:name, klass, front, desc]
|
||||
@renewer = renewer || Rinda::SimpleRenewer.new
|
||||
end
|
||||
|
||||
##
|
||||
# Advertises this service on the primary remote TupleSpace.
|
||||
|
||||
def provide
|
||||
ts = Rinda::RingFinger.primary
|
||||
ts.write(@tuple, @renewer)
|
||||
end
|
||||
|
||||
end
|
||||
|
||||
end
|
||||
|
||||
if __FILE__ == $0
|
||||
|
|
@ -162,3 +268,4 @@ if __FILE__ == $0
|
|||
end
|
||||
end
|
||||
end
|
||||
|
||||
|
|
|
|||
|
|
@ -1,47 +1,66 @@
|
|||
#
|
||||
# = tuplespace: <i>???</i>
|
||||
#
|
||||
# <i>Overview of rinda/tuplespace.rb</i>
|
||||
#
|
||||
# <i>Example(s)</i>
|
||||
#
|
||||
|
||||
require 'monitor'
|
||||
require 'thread'
|
||||
require 'drb/drb'
|
||||
require 'rinda/rinda'
|
||||
|
||||
module Rinda
|
||||
#
|
||||
|
||||
##
|
||||
# A TupleEntry is a Tuple (i.e. a possible entry in some Tuplespace)
|
||||
# together with expiry and cancellation data.
|
||||
#
|
||||
|
||||
class TupleEntry
|
||||
|
||||
include DRbUndumped
|
||||
|
||||
attr_accessor :expires
|
||||
|
||||
##
|
||||
# Creates a TupleEntry based on +ary+ with an optional renewer or expiry
|
||||
# time +sec+.
|
||||
#
|
||||
# A renewer must implement the +renew+ method which returns a Numeric,
|
||||
# nil, or true to indicate when the tuple has expired.
|
||||
|
||||
def initialize(ary, sec=nil)
|
||||
@cancel = false
|
||||
@expires = nil
|
||||
@tuple = make_tuple(ary)
|
||||
@renewer = nil
|
||||
renew(sec)
|
||||
end
|
||||
attr_accessor :expires
|
||||
|
||||
##
|
||||
# Marks this TupleEntry as canceled.
|
||||
|
||||
def cancel
|
||||
@cancel = true
|
||||
end
|
||||
|
||||
##
|
||||
# A TupleEntry is dead when it is canceled or expired.
|
||||
|
||||
def alive?
|
||||
!canceled? && !expired?
|
||||
end
|
||||
|
||||
##
|
||||
# Return the object which makes up the tuple itself: the Array
|
||||
# or Hash.
|
||||
|
||||
def value; @tuple.value; end
|
||||
|
||||
##
|
||||
# Returns the canceled status.
|
||||
|
||||
def canceled?; @cancel; end
|
||||
|
||||
##
|
||||
# Has this tuple expired? (true/false).
|
||||
#
|
||||
# A tuple has expired when its expiry timer based on the +sec+ argument to
|
||||
# #initialize runs out.
|
||||
|
||||
def expired?
|
||||
return true unless @expires
|
||||
return false if @expires > Time.now
|
||||
|
|
@ -51,8 +70,8 @@ module Rinda
|
|||
return @expires < Time.now
|
||||
end
|
||||
|
||||
# Reset the expiry data according to the supplied argument. If
|
||||
# the argument is:
|
||||
##
|
||||
# Reset the expiry time according to +sec_or_renewer+.
|
||||
#
|
||||
# +nil+:: it is set to expire in the far future.
|
||||
# +false+:: it has expired.
|
||||
|
|
@ -60,19 +79,19 @@ module Rinda
|
|||
#
|
||||
# Otherwise the argument refers to some kind of renewer object
|
||||
# which will reset its expiry time.
|
||||
|
||||
def renew(sec_or_renewer)
|
||||
sec, @renewer = get_renewer(sec_or_renewer)
|
||||
@expires = make_expires(sec)
|
||||
end
|
||||
|
||||
# Create an expiry time. Called with:
|
||||
#
|
||||
# +true+:: the expiry time is the start of 1970 (i.e. expired).
|
||||
# +nil+:: it is Tue Jan 19 03:14:07 GMT Standard Time 2038 (i.e. when
|
||||
# UNIX clocks will die)
|
||||
#
|
||||
# otherwise it is +sec+ seconds into the
|
||||
# future.
|
||||
##
|
||||
# Returns an expiry Time based on +sec+ which can be one of:
|
||||
# Numeric:: +sec+ seconds into the future
|
||||
# +true+:: the expiry time is the start of 1970 (i.e. expired)
|
||||
# +nil+:: it is Tue Jan 19 03:14:07 GMT Standard Time 2038 (i.e. when
|
||||
# UNIX clocks will die)
|
||||
|
||||
def make_expires(sec=nil)
|
||||
case sec
|
||||
when Numeric
|
||||
|
|
@ -84,29 +103,43 @@ module Rinda
|
|||
end
|
||||
end
|
||||
|
||||
# Accessor method for the tuple.
|
||||
##
|
||||
# Retrieves +key+ from the tuple.
|
||||
|
||||
def [](key)
|
||||
@tuple[key]
|
||||
end
|
||||
|
||||
##
|
||||
# Fetches +key+ from the tuple.
|
||||
|
||||
def fetch(key)
|
||||
@tuple.fetch(key)
|
||||
end
|
||||
|
||||
##
|
||||
# The size of the tuple.
|
||||
|
||||
def size
|
||||
@tuple.size
|
||||
end
|
||||
|
||||
# Create a new tuple from the supplied object (array-like).
|
||||
##
|
||||
# Creates a Rinda::Tuple for +ary+.
|
||||
|
||||
def make_tuple(ary)
|
||||
Rinda::Tuple.new(ary)
|
||||
end
|
||||
|
||||
private
|
||||
# Given +true+, +nil+, or +Numeric+, returns that (suitable input to
|
||||
# make_expires) and +nil+ (no actual +renewer+), else it return the
|
||||
# time data from the supplied +renewer+.
|
||||
|
||||
##
|
||||
# Returns a valid argument to make_expires and the renewer or nil.
|
||||
#
|
||||
# Given +true+, +nil+, or Numeric, returns that value and +nil+ (no actual
|
||||
# renewer). Otherwise it returns an expiry value from calling +it.renew+
|
||||
# and the renewer.
|
||||
|
||||
def get_renewer(it)
|
||||
case it
|
||||
when Numeric, true, nil
|
||||
|
|
@ -119,35 +152,42 @@ module Rinda
|
|||
end
|
||||
end
|
||||
end
|
||||
|
||||
end
|
||||
|
||||
#
|
||||
# The same as a TupleEntry but with methods to do matching.
|
||||
#
|
||||
##
|
||||
# A TemplateEntry is a Template together with expiry and cancellation data.
|
||||
|
||||
class TemplateEntry < TupleEntry
|
||||
##
|
||||
# Matches this TemplateEntry against +tuple+. See Template#match for
|
||||
# details on how a Template matches a Tuple.
|
||||
|
||||
def match(tuple)
|
||||
@tuple.match(tuple)
|
||||
end
|
||||
|
||||
alias === match
|
||||
|
||||
# Create a new Template from the supplied object.
|
||||
def make_tuple(ary)
|
||||
def make_tuple(ary) # :nodoc:
|
||||
Rinda::Template.new(ary)
|
||||
end
|
||||
|
||||
end
|
||||
|
||||
#
|
||||
##
|
||||
# <i>Documentation?</i>
|
||||
#
|
||||
|
||||
class WaitTemplateEntry < TemplateEntry
|
||||
|
||||
attr_reader :found
|
||||
|
||||
def initialize(place, ary, expires=nil)
|
||||
super(ary, expires)
|
||||
@place = place
|
||||
@cond = place.new_cond
|
||||
@found = nil
|
||||
end
|
||||
attr_reader :found
|
||||
|
||||
def cancel
|
||||
super
|
||||
|
|
@ -168,12 +208,39 @@ module Rinda
|
|||
@cond.signal
|
||||
end
|
||||
end
|
||||
|
||||
end
|
||||
|
||||
##
|
||||
# A NotifyTemplateEntry is returned by TupleSpace#notify and is notified of
|
||||
# TupleSpace changes. You may receive either your subscribed event or the
|
||||
# 'close' event when iterating over notifications.
|
||||
#
|
||||
# <i>Documentation?</i>
|
||||
# See TupleSpace#notify_event for valid notification types.
|
||||
#
|
||||
# == Example
|
||||
#
|
||||
# ts = Rinda::TupleSpace.new
|
||||
# observer = ts.notify 'write', [nil]
|
||||
#
|
||||
# Thread.start do
|
||||
# observer.each { |t| p t }
|
||||
# end
|
||||
#
|
||||
# 3.times { |i| ts.write [i] }
|
||||
#
|
||||
# Outputs:
|
||||
#
|
||||
# ['write', [0]]
|
||||
# ['write', [1]]
|
||||
# ['write', [2]]
|
||||
|
||||
class NotifyTemplateEntry < TemplateEntry
|
||||
|
||||
##
|
||||
# Creates a new NotifyTemplateEntry that watches +place+ for +event+s that
|
||||
# match +tuple+.
|
||||
|
||||
def initialize(place, event, tuple, expires=nil)
|
||||
ary = [event, Rinda::Template.new(tuple)]
|
||||
super(ary, expires)
|
||||
|
|
@ -181,10 +248,17 @@ module Rinda
|
|||
@done = false
|
||||
end
|
||||
|
||||
##
|
||||
# Called by TupleSpace to notify this NotifyTemplateEntry of a new event.
|
||||
|
||||
def notify(ev)
|
||||
@queue.push(ev)
|
||||
end
|
||||
|
||||
##
|
||||
# Retrieves a notification. Raises RequestExpiredError when this
|
||||
# NotifyTemplateEntry expires.
|
||||
|
||||
def pop
|
||||
raise RequestExpiredError if @done
|
||||
it = @queue.pop
|
||||
|
|
@ -192,7 +266,10 @@ module Rinda
|
|||
return it
|
||||
end
|
||||
|
||||
def each
|
||||
##
|
||||
# Yields event/tuple pairs until this NotifyTemplateEntry expires.
|
||||
|
||||
def each # :yields: event, tuple
|
||||
while !@done
|
||||
it = pop
|
||||
yield(it)
|
||||
|
|
@ -201,17 +278,22 @@ module Rinda
|
|||
ensure
|
||||
cancel
|
||||
end
|
||||
|
||||
end
|
||||
|
||||
#
|
||||
##
|
||||
# TupleBag is an unordered collection of tuples. It is the basis
|
||||
# of Tuplespace.
|
||||
#
|
||||
|
||||
class TupleBag
|
||||
def initialize
|
||||
|
||||
def initialize # :nodoc:
|
||||
@hash = {}
|
||||
end
|
||||
|
||||
##
|
||||
# +true+ if the TupleBag to see if it has any expired entries.
|
||||
|
||||
def has_expires?
|
||||
@hash.each do |k, v|
|
||||
v.each do |tuple|
|
||||
|
|
@ -221,43 +303,55 @@ module Rinda
|
|||
false
|
||||
end
|
||||
|
||||
# Add the object to the TupleBag.
|
||||
##
|
||||
# Add +ary+ to the TupleBag.
|
||||
|
||||
def push(ary)
|
||||
size = ary.size
|
||||
@hash[size] ||= []
|
||||
@hash[size].push(ary)
|
||||
end
|
||||
|
||||
# Remove the object from the TupleBag.
|
||||
##
|
||||
# Removes +ary+ from the TupleBag.
|
||||
|
||||
def delete(ary)
|
||||
size = ary.size
|
||||
@hash.fetch(size, []).delete(ary)
|
||||
end
|
||||
|
||||
# Finds all tuples that match the template and are alive.
|
||||
##
|
||||
# Finds all live tuples that match +template+.
|
||||
|
||||
def find_all(template)
|
||||
@hash.fetch(template.size, []).find_all do |tuple|
|
||||
tuple.alive? && template.match(tuple)
|
||||
end
|
||||
end
|
||||
|
||||
# Finds a template that matches and is alive.
|
||||
##
|
||||
# Finds a live tuple that matches +template+.
|
||||
|
||||
def find(template)
|
||||
@hash.fetch(template.size, []).find do |tuple|
|
||||
tuple.alive? && template.match(tuple)
|
||||
end
|
||||
end
|
||||
|
||||
# Finds all tuples in the TupleBag which when treated as
|
||||
# templates, match the supplied tuple and are alive.
|
||||
##
|
||||
# Finds all tuples in the TupleBag which when treated as templates, match
|
||||
# +tuple+ and are alive.
|
||||
|
||||
def find_all_template(tuple)
|
||||
@hash.fetch(tuple.size, []).find_all do |template|
|
||||
template.alive? && template.match(tuple)
|
||||
end
|
||||
end
|
||||
|
||||
# Delete tuples which are not alive from the TupleBag. Returns
|
||||
# the list of tuples so deleted.
|
||||
##
|
||||
# Delete tuples which dead tuples from the TupleBag, returning the deleted
|
||||
# tuples.
|
||||
|
||||
def delete_unless_alive
|
||||
deleted = []
|
||||
@hash.keys.each do |size|
|
||||
|
|
@ -273,15 +367,28 @@ module Rinda
|
|||
end
|
||||
deleted
|
||||
end
|
||||
|
||||
end
|
||||
|
||||
#
|
||||
##
|
||||
# The Tuplespace manages access to the tuples it contains,
|
||||
# ensuring mutual exclusion requirements are met.
|
||||
#
|
||||
# The +sec+ option for the write, take, move, read and notify methods may
|
||||
# either be a number of seconds or a Renewer object.
|
||||
|
||||
class TupleSpace
|
||||
|
||||
include DRbUndumped
|
||||
include MonitorMixin
|
||||
|
||||
##
|
||||
# Creates a new TupleSpace. +period+ is used to control how often to look
|
||||
# for dead tuples after modifications to the TupleSpace.
|
||||
#
|
||||
# If no dead tuples are found +period+ seconds after the last
|
||||
# modification, the TupleSpace will stop looking for dead tuples.
|
||||
|
||||
def initialize(period=60)
|
||||
super()
|
||||
@bag = TupleBag.new
|
||||
|
|
@ -292,7 +399,9 @@ module Rinda
|
|||
@keeper = nil
|
||||
end
|
||||
|
||||
# Put a tuple into the tuplespace.
|
||||
##
|
||||
# Adds +tuple+
|
||||
|
||||
def write(tuple, sec=nil)
|
||||
entry = TupleEntry.new(tuple, sec)
|
||||
start_keeper
|
||||
|
|
@ -317,11 +426,16 @@ module Rinda
|
|||
entry
|
||||
end
|
||||
|
||||
# Remove an entry from the Tuplespace.
|
||||
##
|
||||
# Removes +tuple+
|
||||
|
||||
def take(tuple, sec=nil, &block)
|
||||
move(nil, tuple, sec, &block)
|
||||
end
|
||||
|
||||
##
|
||||
# Moves +tuple+ to +port+.
|
||||
|
||||
def move(port, tuple, sec=nil)
|
||||
template = WaitTemplateEntry.new(self, tuple, sec)
|
||||
yield(template) if block_given?
|
||||
|
|
@ -356,6 +470,9 @@ module Rinda
|
|||
end
|
||||
end
|
||||
|
||||
##
|
||||
# Reads +tuple+, but does not remove it.
|
||||
|
||||
def read(tuple, sec=nil)
|
||||
template = WaitTemplateEntry.new(self, tuple, sec)
|
||||
yield(template) if block_given?
|
||||
|
|
@ -377,6 +494,9 @@ module Rinda
|
|||
end
|
||||
end
|
||||
|
||||
##
|
||||
# Returns all tuples matching +tuple+. Does not remove the found tuples.
|
||||
|
||||
def read_all(tuple)
|
||||
template = WaitTemplateEntry.new(self, tuple, nil)
|
||||
synchronize do
|
||||
|
|
@ -387,6 +507,18 @@ module Rinda
|
|||
end
|
||||
end
|
||||
|
||||
##
|
||||
# Registers for notifications of +event+. Returns a NotifyTemplateEntry.
|
||||
# See NotifyTemplateEntry for examples of how to listen for notifications.
|
||||
#
|
||||
# +event+ can be:
|
||||
# 'write':: A tuple was added
|
||||
# 'take':: A tuple was taken or moved
|
||||
# 'delete':: A tuple was lost after being overwritten or expiring
|
||||
#
|
||||
# The TupleSpace will also notify you of the 'close' event when the
|
||||
# NotifyTemplateEntry has expired.
|
||||
|
||||
def notify(event, tuple, sec=nil)
|
||||
template = NotifyTemplateEntry.new(self, event, tuple, sec)
|
||||
synchronize do
|
||||
|
|
@ -396,6 +528,10 @@ module Rinda
|
|||
end
|
||||
|
||||
private
|
||||
|
||||
##
|
||||
# Removes dead tuples.
|
||||
|
||||
def keep_clean
|
||||
synchronize do
|
||||
@read_waiter.delete_unless_alive.each do |e|
|
||||
|
|
@ -413,6 +549,10 @@ module Rinda
|
|||
end
|
||||
end
|
||||
|
||||
##
|
||||
# Notifies all registered listeners for +event+ of a status change of
|
||||
# +tuple+.
|
||||
|
||||
def notify_event(event, tuple)
|
||||
ev = [event, tuple]
|
||||
@notify_waiter.find_all_template(ev).each do |template|
|
||||
|
|
@ -420,6 +560,9 @@ module Rinda
|
|||
end
|
||||
end
|
||||
|
||||
##
|
||||
# Creates a thread that scans the tuplespace for expired tuples.
|
||||
|
||||
def start_keeper
|
||||
return if @keeper && @keeper.alive?
|
||||
@keeper = Thread.new do
|
||||
|
|
@ -430,11 +573,17 @@ module Rinda
|
|||
end
|
||||
end
|
||||
|
||||
##
|
||||
# Checks the tuplespace to see if it needs cleaning.
|
||||
|
||||
def need_keeper?
|
||||
return true if @bag.has_expires?
|
||||
return true if @read_waiter.has_expires?
|
||||
return true if @take_waiter.has_expires?
|
||||
return true if @notify_waiter.has_expires?
|
||||
end
|
||||
|
||||
end
|
||||
|
||||
end
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue