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This is the documentation for an older version of Qube. The latest version of the documentation can be found here: Qube

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Note
titleSupervisor_language_flags

supervisor_language_flags must contain "python" or all python callbacks will be ignored.

 

Sometimes the best way to perform complex behavior in a callback is to put that behavior into an external script which can take the job ID or the job ID and agenda item name (the frame number) as arguments.

...

Code Block
linenumberstrue
languagepython
#!/bin/env python

import sys,os,subprocess

sys.path.append('%s/api/python' % os.environ['QBDIR'])
import qb

scriptPathOnSupervisor = '/Users/jburk/test/testCbScript.py'

########################################
# build the job
########################################
job = {
    'prototype': 'cmdrange',
    'name': 'supervisor-side script execution callback test',
    'package': {'cmdline': 'hostname'},
    'agenda': [],
    'callbacks': [ ]
}
########################################
# iterate over the frame range to build the job's agenda and callbacks
########################################
for i in range(5):

    # an agenda item can simply be a frame number
    work = {'name': i}
    job['agenda'].append(work)

    # build a callback for each item in the agenda (each frame)
    cb = {
        'language': 'python',
        'triggers': 'done-job-self', 
        'code': '''
import os

jobId = qb.jobid()
workName = %s

script = '%s'
if os.path.exists(script):
    pid = os subprocess.spawnl(os.P_NOWAITPopen(["python", script, os.path.basename(script), str(jobId), str(workName)]).pid
''' % (i, scriptPathOnSupervisor)
    }

    # append the frame's callback to the job's callback list
    job['callbacks'].append(cb)

########################################
# submit the job
########################################
submitted = qb.submit(job)
for job in submitted:
    print 'submitted %(id)s: %(name)s' % job

...

Note
titlePython

In line 41 of the above script, using "python" assumes that python is in the supervisor user's PATH environment. If not, use the full path to python. If the python script can be invoked on its own (without calling it as an argument to the python executable itself), then you can leave out "python" all together.