Class: WorkflowRb::WorkflowExecutor

Inherits:
Object
  • Object
show all
Defined in:
lib/workflow_rb/services/workflow_executor.rb

Instance Method Summary collapse

Constructor Details

#initialize(registry, persistence, host, logger) ⇒ WorkflowExecutor

Returns a new instance of WorkflowExecutor.



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# File 'lib/workflow_rb/services/workflow_executor.rb', line 14

def initialize(registry, persistence, host, logger)
  @registry = registry
  @persistence = persistence
  @host = host
  @logger = logger
end

Instance Method Details

#execute(workflow) ⇒ Object 



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# File 'lib/workflow_rb/services/workflow_executor.rb', line 21

def execute(workflow)
  @logger.debug("Executing workflow #{workflow.id}")
  exe_pointers = workflow.execution_pointers.select { |x| x.active }
  definition = @registry.get_definition(workflow.definition_id, workflow.version)
  if not definition
    raise Exception "Workflow definition #{workflow.definition_id}"
  end

  exe_pointers.each do |pointer|
    step = definition.steps.select { |x| x.id == pointer.step_id }.first
    if not step
      raise Exception "Step #{pointer.step_id} not found in definition"
    end

    if (step.kind_of?(SubscriptionStep)) and (not pointer.event_published)
      pointer.event_name = step.event_name
      pointer.event_key = step.event_key
      pointer.active = false
      @host.subscribe_event(workflow.id, step.id, step.event_name, step.event_key)
      next
    end


    if not pointer.start_time
      pointer.start_time = Time.new
    end

    execution_context = StepExecutionContext.new
    execution_context.persistence_data = pointer.persistence_data
    execution_context.workflow = workflow
    execution_context.step = step


    if step.body.kind_of?(Proc)
      body_class = Class.new(StepBody) do
        def initialize(body)
          @body = body
        end
        def run(context)
          @body.call(context)
        end
      end
      body_obj = body_class.new(step.body)
    else
      if step.body <= StepBody
        body_obj = step.body.new
      end
    end

    if not body_obj
      raise "Cannot construct step body #{step.body}"
    end

    step.inputs.each do |input|
      io_value = input.value.call(workflow.data)
      body_obj.send("#{input.property}=", io_value)
    end

    if (body_obj.kind_of?(SubscriptionStepBody)) and (pointer.event_published)
      body_obj.event_data = pointer.event_data
    end

    result = body_obj.run(execution_context)

    if (result.proceed)

      step.outputs.each do |output|
        io_value = output.value.call(body_obj)
        workflow.data.send("#{output.property}=", io_value)
      end

      pointer.active = false
      pointer.end_time = Time.new
      fork_counter = 1
      pointer.path_terminator = true

      step.outcomes.select {|x| x.value == result.outcome_value}.each do |outcome|
        new_pointer = ExecutionPointer.new
        new_pointer.active = true
        new_pointer.step_id = outcome.next_step
        new_pointer.concurrent_fork = fork_counter * pointer.concurrent_fork
        workflow.execution_pointers << new_pointer
        pointer.path_terminator = false
        fork_counter += 1
      end
    else
      pointer.persistence_data = result.persistence_data
      pointer.sleep_until = result.sleep_until
    end

  end
  determine_next_execution(workflow)
  @persistence.persist_workflow(workflow)
end