text: import os
  from typing import Any, Dict, Optional, Union
  
  from . import load_tool
  from .context import LoadingContext, RuntimeContext
  from .errors import WorkflowException
  from .executors import JobExecutor, SingleJobExecutor
  from .process import Process
  from .utils import CWLObjectType
  
  
  class WorkflowStatus(Exception):
      def __init__(self, out: Optional[CWLObjectType], status: str) -> None:
          """Signaling exception for the status of a Workflow."""
          super(WorkflowStatus, self).__init__("Completed %s" % status)
          self.out = out
          self.status = status
  
  
  class Callable(object):
      def __init__(self, t: Process, factory: "Factory") -> None:
          """Initialize."""
          self.t = t
          self.factory = factory
  
      def __call__(self, **kwargs):
          # type: (**Any) -> Union[str, Optional[CWLObjectType]]
          runtime_context = self.factory.runtime_context.copy()
          runtime_context.basedir = os.getcwd()
          out, status = self.factory.executor(self.t, kwargs, runtime_context)
          if status != "success":
              raise WorkflowStatus(out, status)
          else:
              return out
  
  
  class Factory(object):
      def __init__(
          self,
          executor: Optional[JobExecutor] = None,
          loading_context: Optional[LoadingContext] = None,
          runtime_context: Optional[RuntimeContext] = None,
      ) -> None:
          """Easy way to load a CWL document for execution."""
          if executor is None:
              executor = SingleJobExecutor()
          self.executor = executor
          self.loading_context = loading_context
          if loading_context is None:
              self.loading_context = LoadingContext()
          if runtime_context is None:
              self.runtime_context = RuntimeContext()
          else:
              self.runtime_context = runtime_context
  
      def make(self, cwl: Union[str, Dict[str, Any]]) -> Callable:
          """Instantiate a CWL object from a CWl document."""
          load = load_tool.load_tool(cwl, self.loading_context)
          if isinstance(load, int):
              raise WorkflowException("Error loading tool")
          return Callable(load, self)
  