def create_device(self, workflow_context, device_id):
workflow_exec_id = workflow_context['workflow_execution_id']
logger.info('Creating app instance for workflow {}, device {}'.format(workflow_exec_id, device_id))
redis_key = ActionExecution.format_app_instance_key(workflow_exec_id, device_id)
app_class = get_app(app_name)
if not redis_cache.cache.sismember(app_instance_set_name, redis_key):
# If workflows become parallelized, this will need to be locked
logger.info('Creating new app instance')
app_instance = app_class(app_name, device_id, workflow_context)
redis_cache.cache.sadd(app_instance_set_name, redis_key)
return app_instance
else:
logger.debug('Using existing app instance')
return App.from_cache(app_name, device_id, workflow_context)
