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bst_fibonacci.py
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Fri, Aug 16, 00:22

bst_fibonacci.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2009, 2010, 2011 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.
"""Invenio Bibliographic Tasklet Example.
Demonstrates BibTaskLet <-> BibTask <-> BibSched connectivity
"""
import sys
import time
from invenio.bibtask import write_message, task_set_option, \
task_get_option, task_update_progress, task_has_option, \
task_get_task_param, task_sleep_now_if_required
def fib(n):
"""Returns Fibonacci number for 'n'."""
out = 1
if n >= 2:
out = fib(n-2) + fib(n-1)
return out
def bst_fibonacci(n=30):
"""
Small tasklets that prints the the Fibonacci sequence for n.
@param n: how many Fibonacci numbers to print.
@type n: int
"""
## Since it's tasklet, the parameter might be passed as a string.
## it should then be converted to an int.
n = int(n)
write_message("Printing %d Fibonacci numbers." % n, verbose=9)
for i in range(0, n):
if i > 0 and i % 4 == 0:
write_message("Error: water in the CPU. Ignoring and continuing.", sys.stderr, verbose=3)
elif i > 0 and i % 5 == 0:
write_message("Error: floppy drive dropped on the floor. Ignoring and continuing.", sys.stderr)
write_message("fib(%d)=%d" % (i, fib(i)))
task_update_progress("Done %d out of %d." % (i, n))
task_sleep_now_if_required(can_stop_too=True)
time.sleep(1)
task_update_progress("Done %d out of %d." % (n, n))
return 1

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