Class: Ruote::Exp::RefExpression

Inherits:
FlowExpression show all
Defined in:
lib/ruote/exp/fe_ref.rb

Overview

Sometimes you don't know at 'design time', if you want to trigger a participant or subprocess.

Ruote.process_definition do
  sequence do
    participant 'alice'
    ref '${solver}'
    participant 'charlie'
  end
end

In this process, solver's name could be a participant name or a subprocess name.

Subprocesses have the priority over participants.

Note: this expression is used by the worker when substituting unknown expression names with participant or subprocess refs.

Constant Summary

Constant Summary

Constants inherited from FlowExpression

FlowExpression::COMMON_ATT_KEYS

Instance Attribute Summary

Attributes inherited from FlowExpression

#context, #error

Instance Method Summary collapse

Methods inherited from FlowExpression

#ancestor?, #applied_workitem, #att, #att_text, #attribute, #attribute_text, #attributes, #await, #cancel, #cancel_flanks, #cfei_at, #child_id, #child_ids, #compile_atts, #compile_variables, #debug_id, #deflate, #do, do_action, #do_apply, #do_cancel, #do_fail, #do_pause, #do_persist, #do_reply, #do_reply_to_parent, #do_resume, #do_unpersist, dummy, #fei, fetch, from_h, #handle_on_error, #has_attribute, #initial_persist, #initialize, #is_concurrent?, #iterative_var_lookup, #launch_sub, #lookup_val, #lookup_val_prefix, #lookup_variable, #name, names, #parent, #parent_id, #pause_on_apply, #persist_or_raise, #reply, #reply_to_parent, #root, #root_id, #set_variable, #tree, #tree_children, #try_persist, #try_unpersist, #unpersist_or_raise, #unset_variable, #update_tree, #variables, #wfid

Methods included from WithMeta

#class_def, included

Methods included from WithH

#h, #h=, included, #to_h

Constructor Details

This class inherits a constructor from Ruote::Exp::FlowExpression

Instance Method Details

#applyObject



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# File 'lib/ruote/exp/fe_ref.rb', line 52

def apply

  key = (attribute(:ref) || attribute_text).to_s

  if name != 'ref'
    key = name
    tree[1]['ref'] = key
  end

  key = dsub(key)
    # see test/functional/ft_62_

  key2, value = iterative_var_lookup(key)

  tree[1]['ref'] = key2 if key2
  tree[1]['original_ref'] = key if key2 != key

  unless value
    #
    # seems like it's a participant

    @h['participant'] =
      @context.plist.lookup_info(tree[1]['ref'], h.applied_workitem)

    value = key2 if ( ! @h['participant']) && (key2 != key)
  end

  new_exp_name, new_exp_class = nil

  # warning: abusing on 'then' in order to have [somehow] more readability

  if
    value.is_a?(String)
  then

    if
      @context['participant_in_variable_enabled'] &&
      value.match(/\bdef consume\(/) &&
      (Rufus::TreeChecker.parse(value) rescue false)
    then
      #
      # participant code passed

      @h['participant'] = [ 'Ruote::CodeParticipant', { 'code' => value } ]
      tree[1]['ref'] = key

    elsif klass = @context.expmap.expression_class(tree[1]['ref'])
      #
      # aliased expression

      new_exp_name = value
      new_exp_class = klass
    end

  elsif
    @context['participant_in_variable_enabled'] &&
    value.is_a?(Hash) &&
    value['on_workitem']
  then
    #
    # participant 'defined' in var

    @h['participant'] = [ 'Ruote::BlockParticipant', value ]

  elsif
    value.is_a?(Array) &&
    value.size == 2 && value.last.is_a?(Hash)
  then
    #
    # participant 'registered' in var

    @h['participant'] = value
  end

  if value == nil && @h['participant'] == nil
    #
    # unknown participant or subprocess

    @h['state'] = 'failed'
    persist_or_raise

    raise("unknown participant or subprocess '#{tree[1]['ref']}'")
  end

  new_exp_name, new_exp_class = if new_exp_name
    [ new_exp_name, new_exp_class ]
  elsif @h['participant']
    [ 'participant', Ruote::Exp::ParticipantExpression ]
  else
    [ 'subprocess', Ruote::Exp::SubprocessExpression ]
  end

  tree[0] = new_exp_name
  @h['name'] = new_exp_name

  new_exp = new_exp_class.new(@context, @h)

  #new_exp.initial_persist
    # not necessary

  new_exp.apply
end