/usr/lib/ruby/1.8/needle/lifecycle/threaded.rb is in libneedle-ruby1.8 1.3.0-1.
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# =============================================================================
# Copyright (c) 2004, Jamis Buck (jamis@37signals.com)
# All rights reserved.
#
# This source file is distributed as part of the Needle dependency injection
# library for Ruby. This file (and the library as a whole) may be used only as
# allowed by either the BSD license, or the Ruby license (or, by association
# with the Ruby license, the GPL). See the "doc" subdirectory of the Needle
# distribution for the texts of these licenses.
# -----------------------------------------------------------------------------
# needle website : http://needle.rubyforge.org
# project website: http://rubyforge.org/projects/needle
# =============================================================================
#++
require 'needle/pipeline/element'
module Needle
module Lifecycle
# The instantiation pipeline element that enforces the singleton
# multiplicity, on a per-thread basis.
class Threaded < Needle::Pipeline::Element
set_default_priority 100
# Returns a Hash of threaded services that are cached by the current
# thread.
def service_cache
Thread.current[ :threaded_services ] ||= Hash.new
end
# Returns the cached reference, if it has been previously cached for
# the current thread. Otherwise, invokes the next element in the pipeline
# and caches the result. The cached reference is returned.
def call( container, point )
cache = service_cache
name = service_point.fullname
unless cache.has_key?( name )
service = succ.call( container, point )
cache[ name ] = service
end
cache[ name ]
end
# Resets the cached singleton instance, so that the next time it is
# requested it is re-constructed. Only the cache for the current thread
# and service point is reset.
def reset!
cache = service_cache
cache.delete service_point.fullname
end
end
end
end
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