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# -*- coding: utf-8 -*-
# checkerthread.py
# Copyright (C) 2013 LEAP
#
# 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, see <http://www.gnu.org/licenses/>.
"""
Checker thread
"""
import logging
from PySide import QtCore
from leap.util.check import leap_assert_type
logger = logging.getLogger(__name__)
class CheckerThread(QtCore.QThread):
"""
Generic checker thread that can perform any type of operation as
long as it returns a boolean value that identifies how the
execution went.
"""
IDLE_SLEEP_INTERVAL = 1
def __init__(self):
QtCore.QThread.__init__(self)
self._checks = []
self._checks_lock = QtCore.QMutex()
self._should_quit = False
self._should_quit_lock = QtCore.QMutex()
def get_should_quit(self):
"""
Returns wether this thread should quit
@rtype: bool
@return: True if the thread should terminate itself, Flase otherwise
"""
QtCore.QMutexLocker(self._should_quit_lock)
return self._should_quit
def set_should_quit(self):
"""
Sets the should_quit flag to True so that this thread
terminates the first chance it gets
"""
QtCore.QMutexLocker(self._should_quit_lock)
self._should_quit = True
def start(self):
"""
Starts the thread and resets the should_quit flag
"""
with QtCore.QMutexLocker(self._should_quit_lock):
self._should_quit = False
QtCore.QThread.start(self)
def add_checks(self, checks):
"""
Adds a list of checks to the ones being executed
@param checks: check functions to perform
@type checkes: list
"""
with QtCore.QMutexLocker(self._checks_lock):
self._checks += checks
def run(self):
"""
Main run loop for this thread. Executes the checks.
"""
shouldContinue = False
while True:
if self.get_should_quit():
logger.debug("Quitting checker thread")
return
checkSomething = False
with QtCore.QMutexLocker(self._checks_lock):
if len(self._checks) > 0:
check = self._checks.pop(0)
shouldContinue = check()
leap_assert_type(shouldContinue, bool)
checkSomething = True
if not shouldContinue:
logger.debug("Something went wrong with the checks, "
"clearing...")
self._checks = []
checkSomething = False
if not checkSomething:
self.sleep(self.IDLE_SLEEP_INTERVAL)
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