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tryton/doc/topics/task_queue.rst
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.. _topics-task-queue:
==========
Task Queue
==========
Tryton provides a way to run asynchronously some tasks. You must activate the
worker in the `queue` section of the :ref:`configuration
<topics-configuration>` and :ref:`run the worker manager
<topics-start-server>` 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
:class:`trytond.model.Model`. This include the
:attr:`trytond.transaction.Transaction.context`, the
:attr:`trytond.transaction.Transaction.user` and the arguments.
The first argument of the method must be an instance or a list of instances of
:class:`trytond.model.Model`. This other arguments must be JSON-ifiable.
A task is pushed into the `queue` by calling the desired method on the
:attr:`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.
The following :attr:`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.
.. warning::
There is no access right verification during the execution of the task.
Example:
.. highlight:: python
::
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