# Back In Time
# Copyright (C) 2008-2022 Oprea Dan, Bart de Koning, Richard Bailey, Germar Reitze
#
# 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 2 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
import os
import logger
from applicationinstance import ApplicationInstance
[docs]
class GUIApplicationInstance(ApplicationInstance):
"""
class used to handle one application instance mechanism
"""
def __init__(self, baseControlFile, raiseCmd = ''):
"""
specify the base for control files
"""
self.raiseFile = baseControlFile + '.raise'
self.raiseCmd = raiseCmd
super(GUIApplicationInstance, self).__init__(baseControlFile + '.pid', False, False)
#remove raiseFile is already exists
if os.path.exists(self.raiseFile):
os.remove(self.raiseFile)
self.check(raiseCmd)
self.startApplication()
[docs]
def check(self, raiseCmd):
"""
check if the current application is already running
"""
ret = super(GUIApplicationInstance, self).check(False)
if not ret:
print("The application is already running! (pid: %s)" % self.pid)
#notify raise
try:
with open(self.raiseFile, 'wt') as f:
f.write(raiseCmd)
except OSError as e:
logger.error('Failed to write raise file %s: [%s] %s' %(e.filename, e.errno, e.strerror))
exit(0) #exit raise an exception so don't put it in a try/except block
else:
return ret
[docs]
def raiseCommand(self):
"""
check if the application must to be raised
return None if no raise needed, or a string command to raise
"""
ret_val = None
try:
if os.path.isfile(self.raiseFile):
with open(self.raiseFile, 'rt') as f:
ret_val = f.read()
os.remove(self.raiseFile)
except:
pass
return ret_val