Adding a SQLite Trigger to a Lattice#
This example illustrates how to use a covalent.trigger.SQLiteTrigger to trigger workflow dispatches automatically at a specified interval.
Prerequisites#
Import Covalent and the trigger.
[10]:
import covalent as ct
from covalent.triggers import SQLiteTrigger
Procedure#
Create a
SQLiteTrigger
object that performs a trigger.
[12]:
sqlite_trigger = SQLiteTrigger(db_path='path/to/your/database.sqlite',table_name='table name')
Create a workflow:
[13]:
@ct.lattice
@ct.electron
def my_workflow():
return 42
Dispatch
my_workflow
, disabling its first execution using thedisable_run
parameter inct.dispatch
.
[14]:
dispatch_id = ct.dispatch(my_workflow)()
print(dispatch_id)
5041f1fc-8943-4b96-9f26-a3c7f35cabef
Attach the trigger to the
dispatch_id
and register it with the trigger server.
[15]:
sqlite_trigger.lattice_dispatch_id = dispatch_id
sqlite_trigger.register()
Monitor the Covalent UI. Watch the Dashboard for new dispatches of
my_workflow
.In the Covalent UI, observe that a new
my_workflow
is dispatched every five seconds.To disable triggers on the dispatch, use the
ct.stop_triggers
function.
[16]:
ct.stop_triggers(dispatch_id)
[2023-09-22 07:37:27,218] [DEBUG] local.py: Line 334 in stop_triggers: Triggers for following dispatch_ids have stopped observing:
[2023-09-22 07:37:27,220] [DEBUG] local.py: Line 336 in stop_triggers: 5041f1fc-8943-4b96-9f26-a3c7f35cabef
Note that the stop_triggers
function disables all triggers attached to the specified dispatch.
See Also#
Adding a Directory Trigger to a Lattice