Creating a BasicExecutionEngine schedule

Ignition
1

I’m trying to use the BasicExecutionEngine to create a tasks schedule, but I’m having issues (doesn’t help my Java knowledge is lacking).
@pturmel (Does Ignition have schedule events?)

from java.lang import Runnable
from com.inductiveautomation.ignition.common.execution.impl import BasicExecutionEngine

class Task(Runnable):
	def run(self):
		print 'Hellooo'

s = BasicExecutionEngine()
s.schedule("task", Task, "0-59 * * * *")

I’m receiving the error:

Traceback (most recent call last):
  File "<buffer>", line 9, in <module>
TypeError: schedule(): 2nd arg can't be coerced to java.lang.Runnable
2

Python usage error. You are providing your Task class when you need to provide a Task instance. Your last line should look like this:

s.schedule("task", Task(), "0-59 * * * *")

By the way, you can put an asterisk in the minute column, too.....

3

Cheers, I thought it was going to be something silly like that :slight_smile:

Looks like it’s working now, thanks!

If I put this code in the gateway startup script, I assume that it will run on the gateway?

Also, how would I get a reference to my BasicExecutionEngine object from another script? (I setup the schedule in my Script Console and not sure how to stop it… Also would be useful to know!)

4

So, object persistence is the kind of thing that can eat your lunch. I would use system.util.getGlobals() to maintain a true single instance, with code to shutdown any prior instance upon script restart. Something like this:

MyBEE = BasicExecutionEngine()
_g = system.util.getGlobals()
_oldBEE = _g.get('some_unique_key_for_BEE')
_g['some_unique_key_for_BEE'] = MyBEE
if _oldBEE:
    _oldBEE.shutdown()

Elsewhere, you can use project.someScript.MyBEE to access the engine. I think you keep the string returned from .schedule() to use with .unSchedule().

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