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# coding: UTF-8
# Copyright 2009, 2010 Thomas Jourdan
#
# This program 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 3 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import sys
import traceback
import threading
import gobject
import ka_debug
import ka_status
class GeneratorTask(object):
"""Decoupling rendering and GUI.
inv: GeneratorTask._internal_task_count >= 0
"""
_internal_task_list_lock = threading.Lock()
_internal_serialize_lock = threading.Lock()
_internal_leave_condition = threading.Condition()
_internal_task_count = 0
_internal_task_list = {}
@staticmethod
def _enter(task):
"""Used for counting of running tasks.
pre: GeneratorTask._internal_task_count >= 0
#pre: not GeneratorTask._internal_task_list.has_key(task.work_for)
post: GeneratorTask. _internal_task_count >= 1
#post: __old__.GeneratorTask._internal_task_count-1 == GeneratorTask._internal_task_count
"""
GeneratorTask._internal_task_list_lock.acquire()
# GeneratorTask._wait(task.work_for)
GeneratorTask._internal_task_count += 1
GeneratorTask._internal_task_list[task.work_for] = task
# ka_debug.info('enter task: [%s], count aprox.= %u' % \
# (task.work_for, GeneratorTask._internal_task_count))
GeneratorTask._internal_task_list_lock.release()
ka_status.Status.instance(). \
set(ka_status.TOPIC_TASK, ka_status.SUB_UNFINISHED,
str(GeneratorTask._internal_task_count))
@staticmethod
def _leave(work_for):
"""Used for counting of running tasks.
pre: GeneratorTask._internal_task_count >= 1
#pre: GeneratorTask._internal_task_list.has_key(work_for)
post: GeneratorTask._internal_task_count >= 0
#post: __old__.GeneratorTask._internal_task_count+1 == GeneratorTask._internal_task_count
"""
GeneratorTask._internal_task_list_lock.acquire()
GeneratorTask._internal_task_count -= 1
GeneratorTask._internal_leave_condition.acquire()
if GeneratorTask._internal_task_list.has_key(work_for):
del GeneratorTask._internal_task_list[work_for]
GeneratorTask._internal_leave_condition.notifyAll()
GeneratorTask._internal_leave_condition.release()
# ka_debug.info('leave task: [%s], count aprox.= %u' % \
# (work_for, GeneratorTask._internal_task_count))
GeneratorTask._internal_task_list_lock.release()
ka_status.Status.instance(). \
set(ka_status.TOPIC_TASK, ka_status.SUB_UNFINISHED,
str(GeneratorTask._internal_task_count))
@staticmethod
def _wait(work_for):
GeneratorTask._internal_task_list_lock.acquire()
if GeneratorTask._internal_task_list.has_key(work_for):
GeneratorTask._internal_task_list[work_for].quit = True
ka_debug.info('set quit task: [%s], count aprox.= %u' % \
(work_for, GeneratorTask._internal_task_count))
ka_debug.print_call_stack()
GeneratorTask._internal_task_list_lock.release()
GeneratorTask._internal_leave_condition.acquire()
while GeneratorTask._internal_task_list.has_key(work_for):
# ka_debug.info('wait task: [%s], count aprox.= %u' % \
# (work_for, GeneratorTask._internal_task_count))
GeneratorTask._internal_leave_condition.wait()
GeneratorTask._internal_leave_condition.release()
@staticmethod
def is_completed():
"""Check that all tasks are terminated.
pre: GeneratorTask._internal_task_count >= 0
"""
return GeneratorTask._internal_task_count < 1
def __init__(self, task_function, on_task_completed, work_for):
"""
pre: task_function is not None and callable(task_function)
pre: on_task_completed is not None and callable(on_task_completed)
"""
self.quit = False
self._on_task_completed = on_task_completed
self._task_function = task_function
self.work_for = work_for
def _start(self, *args, **dummy):
try:
GeneratorTask._internal_serialize_lock.acquire()
GeneratorTask._wait(self.work_for)
GeneratorTask._enter(self)
GeneratorTask._internal_serialize_lock.release()
result = self._task_function(self, *args)
if not self.quit:
# GTK will start this 'completed task' whenever there are no higher
# priority events pending to the default main loop.
gobject.idle_add(self._on_task_completed, result)
else:
ka_debug.info('quitting task: [%s], count aprox.= %u' % \
(self.work_for, GeneratorTask._internal_task_count))
except:
ka_debug.err('failed calculating [%s] [%s] [%s]' % \
(self._task_function, sys.exc_info()[0], sys.exc_info()[1]))
traceback.print_exc(file=sys.__stderr__)
finally:
GeneratorTask._leave(self.work_for)
def start(self, *args, **kwargs):
threading.Thread(target=self._start, args=args, kwargs=kwargs).start()
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