#
#--
# Copyright (c) 2006-2007, John Mettraux, OpenWFE.org
# 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, this
#   list 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 documentation 
#   and/or other materials provided with the distribution.
# 
# . Neither the name of the "OpenWFE" 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.
#++
#
# $Id: definitions.rb 2725 2006-06-02 13:26:32Z jmettraux $
#

#
# "made in Japan"
#
# John Mettraux at openwfe.org
#

require 'openwfe/expressions/flowexpression'
require 'openwfe/expressions/fe_utils'


module OpenWFE

    #
    # Triggers the first (and supposedly unique child of this expression)
    # but never wait for its reply (lose it).
    # A 'lose' expression never replies to its parent expression.
    #
    class LoseExpression < FlowExpression

        names :lose

        def apply (workitem)
            get_expression_pool.apply(children[0], workitem) \
                if (@children and @children.length > 0)
        end

        def reply (workitem)
            get_expression_pool.remove(self)
        end
    end

    #
    # This method triggers its child (in its own thread) and then
    # forgets about it. It immediately replies to its parent expression.
    #
    class ForgetExpression < FlowExpression

        names :forget

        def apply (workitem)

            if (@children and @children.length > 0)

                wi = workitem.dup

                Thread.new do
                    begin
                        #child = get_expression_pool.fetch(@children[0])
                        #child.parent_id = nil
                        get_expression_pool.forget(@children[0])
                        get_expression_pool.apply(@children[0], wi)
                    rescue Exception => e
                        lwarn do
                            "apply() failed to apply child to forget "+
                            OpenWFE::exception_to_s(e)
                        end
                    end
                end
            end

            reply_to_parent(wi)
        end

        def reply (workitem)
            # never gets called
        end
    end

end