#
#--
# Copyright (c) 2006, 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 'rexml/document'

require 'workitem'
require 'ru/rudefinitions'
require 'ru/service'
require 'ru/expressionmap'
require 'ru/expressionpool'
require 'ru/expressionstorage'
require 'ru/participantmap'
require 'ru/schedulers'


module OpenWFEru

    class Engine < Service

        #attr_accessor \
        #    :application_context

        def initialize()

            super('engine', {})

            @application_context[@service_name] = self

            @application_context[S_EXPRESSION_MAP] = build_expression_map()
            @application_context[S_EXPRESSION_POOL] = build_expression_pool()
            @application_context[S_EXPRESSION_STORAGE] = build_expression_storage()
            @application_context[S_PARTICIPANT_MAP] = build_participant_map()

            @application_context[S_SCHEDULER] = \
                SchedulerService.new(S_SCHEDULER, @application_context)

            init_default_logging('engine.log')
        end

        def launch(object)

            launchitem = nil

            #ldebug { "launch() param is #{object.class}" }

            if object.kind_of? OpenWFE::LaunchItem
                launchitem = object
            #elsif object.kind_of? REXML::Element
                #nada
            elsif object.kind_of? String
                launchitem = OpenWFE::LaunchItem.new
                if object[0] == '<'
                    launchitem.workflowDefinitionUrl = "field:__definition"
                    launchitem['definition'] = object
                else
                    launchitem.workflowDefinitionUrl = object
                end
            end

            return @application_context[S_EXPRESSION_POOL].launch(launchitem)
        end

        #
        # registers a participant in this [embedded] engine
        #
        def register_participant (regex, participant)

            @application_context[S_PARTICIPANT_MAP]\
                .register_participant(regex, participant)
        end

        protected

            def build_expression_map ()
                ExpressionMap.new(S_EXPRESSION_MAP, @application_context)
            end

            def build_expression_pool ()
                ExpressionPool.new(S_EXPRESSION_POOL, @application_context)
            end

            def build_expression_storage ()
                InMemoryExpressionStorage \
                    .new(S_EXPRESSION_STORAGE, @application_context)
            end

            def build_participant_map ()
                ParticipantMap.new(S_PARTICIPANT_MAP, @application_context)
            end

    end

end