Class: OpenWFE::ProcessDefinition

Inherits:
Object
  • Object
show all
Defined in:
lib/openwfe/expressions/rprocdef.rb

Overview

Extend this class to create a programmatic process definition.

A short example :

class MyProcessDefinition < OpenWFE::ProcessDefinition
    def make
        process_definition :name => "test1", :revision => "0" do
            sequence do
                set :variable => "toto", :value => "nada"
                print "toto:${toto}"
            end
        end
    end
end

li = OpenWFE::LaunchItem.new(MyProcessDefinition)
engine.launch(li)

Defined Under Namespace

Classes: Context

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ProcessDefinition

Returns a new instance of ProcessDefinition.



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# File 'lib/openwfe/expressions/rprocdef.rb', line 74

def initialize

    super()
    @context = Context.new
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(m, *args, &block) ⇒ Object 



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# File 'lib/openwfe/expressions/rprocdef.rb', line 80

def method_missing (m, *args, &block)

    #puts "__i_method_missing >>>#{m}<<<<"

    ProcessDefinition.make_expression(
        @context, 
        OpenWFE::to_expression_name(m),
        ProcessDefinition.pack_args(args), 
        &block)
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the value of attribute context.



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# File 'lib/openwfe/expressions/rprocdef.rb', line 72

def context
  @context
end

Class Method Details

.do_make(instance = nil) ⇒ Object

A class method for actually “making” the process segment raw representation



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# File 'lib/openwfe/expressions/rprocdef.rb', line 172

def self.do_make (instance=nil)

    context = if @ccontext

        @ccontext.discard
            # preventing further additions in case of reevaluation
        @ccontext

    elsif instance

        instance.make
        instance.context
    else    

        pdef = self.new
        pdef.make
        pdef.context
    end

    return context.top_expression if context.top_expression

    name, revision = 
        extract_name_and_revision(self.metaclass.to_s[8..-2])

    top_expression = [ 
        "process-definition", 
        { "name" => name, "revision" => revision }, 
        context.top_expressions 
    ]

    top_expression
end

.eval_ruby_process_definition(code, safety_level = 2) ⇒ Object

Turns a String containing a ProcessDefinition …



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# File 'lib/openwfe/expressions/rprocdef.rb', line 224

def self.eval_ruby_process_definition (code, safety_level=2)

    #puts "\nin:\n#{code}\n"

    code, is_wrapped = wrap_code code

    o = Rufus::eval_safely code, safety_level, binding()

    o = extract_class(code) \
        if (o == nil) or o.is_a?(Array)
        #if (o == nil) or o.is_a?(SimpleExpRepresentation)
            #
            # grab the first process definition class found
            # in the given code

    #return o.do_make \
    #    if o.is_a?(ProcessDefinition) or o.is_a?(Class)
    #o

    result = o.do_make

    #return result.first_child if is_wrapped
    return result.last.first if is_wrapped

    result
end

.extract_class(ruby_proc_def_string) ⇒ Object

Parses the string to find the class name of the process definition and returns that class (instance).



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# File 'lib/openwfe/expressions/rprocdef.rb', line 209

def self.extract_class (ruby_proc_def_string)

    ruby_proc_def_string.each_line do |l|

        m = ClassNameRex.match l

        return eval(m[1]) if m
    end

    nil
end

.make_expression(context, exp_name, params, &block) ⇒ Object

builds an actual expression representation (a node in the process definition tree).



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# File 'lib/openwfe/expressions/rprocdef.rb', line 107

def self.make_expression (context, exp_name, params, &block)

    string_child = nil
    #attributes = OpenWFE::SymbolHash.new
    attributes = Hash.new

    #puts " ... params.class is #{params.class}"

    if params.kind_of?(Hash)

        params.each do |k, v|

            if k == '0'
                string_child = v.to_s
            else
                #attributes[OpenWFE::symbol_to_name(k.to_s)] = v.to_s
                attributes[OpenWFE::symbol_to_name(k.to_s)] = v
            end
        end

    elsif params

        string_child = params.to_s
    end

    exp = [ exp_name, attributes, [] ]

    exp.last << string_child \
        if string_child

    if context.parent_expression
        #
        # adding this new expression to its parent
        #
        context.parent_expression.last << exp
    else
        #
        # an orphan, a top expression
        #
        context.top_expressions << exp
    end

    return exp unless block

    context.push_parent_expression exp

    result = block.call

    exp.last << result \
        if result and result.kind_of?(String)

    context.pop_parent_expression

    exp
end

.metaclass ⇒ Object 



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# File 'lib/openwfe/expressions/rprocdef.rb', line 70

def self.metaclass; class << self; self; end; end

.method_missing(m, *args, &block) ⇒ Object 



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# File 'lib/openwfe/expressions/rprocdef.rb', line 91

def self.method_missing (m, *args, &block)

    @ccontext = Context.new \
        if (not @ccontext) or @ccontext.discarded?

    ProcessDefinition.make_expression(
        @ccontext, 
        OpenWFE::to_expression_name(m),
        ProcessDefinition.pack_args(args), 
        &block)
end

Instance Method Details

#do_make ⇒ Object 



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# File 'lib/openwfe/expressions/rprocdef.rb', line 163

def do_make

    ProcessDefinition.do_make self
end