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Viewing changes to caffeine/applicationinstance.py

  • Committer: Isaiah Heyer
  • Date: 2009-08-21 04:52:41 UTC
  • Revision ID: freshapplepy@gmail.com-20090821045241-jezoc4ifq6xeuezp
Added command line options.

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caffeine/applicationinstance.py
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#class used to handle one application instance mechanism
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class ApplicationInstance:
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        #specify the file used to save the application instance pid
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        def __init__( self, pid_file ):
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                self.pid_file = pid_file
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                self.check()
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                self.startApplication()
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        #check if the current application is already running
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        def check( self ):
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                #check if the pidfile exists
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                if not os.path.isfile( self.pid_file ):
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                        return
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                #read the pid from the file
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                pid = 0
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                try:
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                        file = open( self.pid_file, 'rt' )
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                        data = file.read()
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                        file.close()
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                        pid = int( data )
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                except:
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                        pass
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                #check if the process with specified by pid exists
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                if 0 == pid:
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                        return
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                try:
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                        os.kill( pid, 0 )       #this will raise an exception if the pid is not valid
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                except:
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                        return
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                #exit the application
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                print "The application is already running !"
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                exit(0) #exit raise an exception so don't put it in a try/except block
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        #called when the single instance starts to save it's pid
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        def startApplication( self ):
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                file = open( self.pid_file, 'wt' )
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                file.write( str( os.getpid() ) )
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                file.close()
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        #called when the single instance exit ( remove pid file )
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        def exitApplication( self ):
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                try:
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                        os.remove( self.pid_file )
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                except:
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                        pass
 
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class ApplicationInstance(object):
 
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    #specify the file used to save the application instance pid
 
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    def __init__(self, pid_file):
 
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        self.pid_file = pid_file
 
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    #check if the current application is already running
 
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    def isAnother(self):
 
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        #check if the pidfile exists
 
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        if not os.path.isfile( self.pid_file ):
 
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            return False
 
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        #read the pid from the file
 
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        pid = 0
 
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        try:
 
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            file = open(self.pid_file, 'rt')
 
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            data = file.read()
 
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            file.close()
 
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            pid = int( data )
 
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            self.pid = pid
 
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        except:
 
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            pass
 
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        #check if the process with specified by pid exists
 
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        if 0 == pid:
 
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            return False
 
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        #this will raise an exception if the pid is not valid
 
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        try:
 
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            os.kill(pid, 0)
 
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        except:
 
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            return False
 
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        return True
 
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    def killOther(self):
 
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        os.kill(self.pid, 9)
 
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    #called when the single instance starts to save it's pid
 
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    def startApplication(self):
 
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        file = open(self.pid_file, 'wt')
 
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        file.write(str(os.getpid()))
 
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        file.close()
 
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    #called when the single instance exit ( remove pid file )
 
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    def exitApplication(self):
 
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        try:
 
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            os.remove(self.pid_file)
 
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        except:
 
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            pass