Ruote::Exp::RefExpression

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.

Public Instance Methods

apply() click to toggle source

# 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

  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 participant

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

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

  if value.is_a?(Array) && value.size == 2 && value.last.is_a?(Hash)
    #
    # participant 'defined' in var

    @h['participant'] = value
  end

  unless value || @h['participant']
    #
    # unknown participant or subprocess

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

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

  new_exp = if @h['participant']

    @h['participant'] = nil if @h['participant'].respond_to?(:consume)
      # instantiated participant

    tree[0] = 'participant'
    @h['name'] = 'participant'
    Ruote::Exp::ParticipantExpression.new(@context, @h)
  else

    tree[0] = 'subprocess'
    @h['name'] = 'subprocess'
    Ruote::Exp::SubprocessExpression.new(@context, @h)
  end

  #new_exp.initial_persist
    # not necessary

  new_exp.apply
end

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Ruote::Exp::RefExpression

Public Instance Methods