sample_tasks.py
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	## This file is part of Invenio.
	## Copyright (C) 2012 CERN.
	##
	## Invenio is free software; you can redistribute it and/or
	## modify it under the terms of the GNU General Public License as
	## published by the Free Software Foundation; either version 2 of the
	## License, or (at your option) any later version.
	##
	## Invenio is distributed in the hope that it will be useful, but
	## WITHOUT ANY WARRANTY; without even the implied warranty of
	## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	## General Public License for more details.
	##
	## You should have received a copy of the GNU General Public License
	## along with Invenio; if not, write to the Free Software Foundation, Inc.,
	## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

	import datetime


	def add_data(a):
	""" Task using closure to allow parameters """
	def _add_data(obj, eng):
	"""Function task_a docstring"""
	obj.data = datetime.datetime.now()
	return _add_data


	def check_data(obj, eng):
	""" Static task with no parameters """
	if obj.data < 5:
	eng.haltProcessing("Value of data is too small.")


	def print_data(obj, eng):
	""" Static task with no parameters """
	print obj.data + datetime.timedelta(days=2)


	def set_data(obj, eng):
	""" Static task with no parameters """
	obj.data = 124