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# mailbox.rb - mailbox class supporting actor implementation
#
# Copyright 2007 MenTaLguY <mental@rydia.net>
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# thi slist of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice
# this list of conditions and the following disclaimer in the documentatio
# and/or other materials provided with the distribution.
# * Neither the name of the Evan Phoenix nor the names of its contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
class Mailbox
def initialize
@channel = Rubinius::Channel.new
@skipped = []
end
def send(value)
@channel.send value
self
end
alias_method :<<, :send
def receive
if block_given?
filter = Filter.new
yield filter
value = nil
action = nil
found_at = nil
@skipped.each_with_index do |obj, index|
action = filter.action_for obj
if action
value = obj
found_at = index
break
end
end
@skipped.delete_at found_at if found_at
until action
value = @channel.receive
action = filter.action_for value
@skipped.push value unless action
end
action.call value
else
unless @skipped.empty?
@skipped.shift
else
@channel.receive
end
end
end
class Filter
def initialize
@pairs = []
end
def when(pattern, &action)
raise ArgumentError, "no block given" unless action
@pairs.push [pattern, action]
end
def action_for(value)
pair = @pairs.find { |pattern, action| pattern === value }
pair ? pair[1] : nil
end
end
end
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