Tryton provides a way to run asynchronously some tasks. You must activate the worker in the queue section of the configuration and run the worker manager otherwise the tasks will be run at the end of the transaction.
A task is the parameters that defines how to call a method from a
trytond.model.Model. This include the
trytond.transaction.Transaction.user and the arguments.
The first argument of the method must be an instance or a list of instances of
trytond.model.Model. This other arguments must be JSON-ifiable.
A task is pushed into the queue by calling the desired method on the
trytond.model.Model.__queue__. This stores in the queue all the current
parameters of the call and it will be execute by a worker or at the end of the
transaction if no worker is configured.
trytond.transaction.Transaction.context keys are used as
parameters for the queue:
- queue_name: The name of the queue. Default value is default.
- queue_scheduled_at: A datetime.timedelta to add to current time to define when the task should be started. Default value is None which means directly.
- queue_expected_at: A datetime.timedelta to add to current time to define when the task should be finished. Default value is None which means as soon as possible.
There is no access right verification during the execution of the task.
from trytond.model import Model class MyModel(Model): "My Model" __name__ = 'my_model' @classmethod def launch(cls, records): for record in records: cls.__queue__.process(record, 42) def process(self, value): self.value = value