def request_workflow_status(self, status):
# Record current workflow status.
current_status = self.get_workflow_status()
# Create an event for the request.
wf_ex_event = events.WorkflowExecutionEvent(status)
# Push the event to all the active tasks. The event may trigger status changes to the task.
for task_state in self.workflow_state.get_tasks_by_status(statuses.ACTIVE_STATUSES):
machines.TaskStateMachine.process_event(self.workflow_state, task_state, wf_ex_event)
# Process the workflow status change event.
machines.WorkflowStateMachine.process_event(self.workflow_state, wf_ex_event)
# Get workflow status after event is processed.
updated_status = self.get_workflow_status()
# Ignore if workflow hasn't changed from paused to pausing.
if (status == statuses.PAUSED and
current_status == statuses.PAUSING and
updated_status == statuses.PAUSING):
return
# Ignore if workflow hasn't changed from canceled to canceling.
if (status == statuses.CANCELED and
current_status == statuses.CANCELING and
updated_status == statuses.CANCELING):
return
# Otherwise, if status has not changed as expected, then raise exception.
if status != current_status and current_status == updated_status:
raise exc.InvalidWorkflowStatusTransition(current_status, wf_ex_event.name)
def request_workflow_state(self, state):
# Record current workflow state.
current_state = self.get_workflow_state()
# Create an event for the request.
wf_ex_event = events.WorkflowExecutionEvent(state)
# Push the event to all the active tasks. The event may trigger state changes to the task.
for task in self.flow.get_tasks_by_state(states.ACTIVE_STATES):
machines.TaskStateMachine.process_event(self, task, wf_ex_event)
# Process the workflow state change event.
machines.WorkflowStateMachine.process_event(self, wf_ex_event)
# Get workflow state after event is processed.
updated_state = self.get_workflow_state()
# If state has not changed as expected, then raise exception.
if state != current_state and current_state == updated_state:
raise exc.InvalidWorkflowStateTransition(current_state, wf_ex_event.name)