/usr/lib/python2.7/dist-packages/smartcard/Observer.py is in python-pyscard 1.9.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 | """
from Thinking in Python, Bruce Eckel
http://python-3-patterns-idioms-test.readthedocs.org/en/latest/Observer.html
(c) Copyright 2008, Creative Commons Attribution-Share Alike 3.0.
Class support for "observer" pattern.
The observer class is the base class
for all smartcard package observers.
Known subclasses:
smartcard.ReaderObserver
"""
from smartcard.Synchronization import *
class Observer(object):
def update(observable, arg):
'''Called when the observed object is
modified. You call an Observable object's
notifyObservers method to notify all the
object's observers of the change.'''
pass
class Observable(Synchronization):
def __init__(self):
self.obs = []
self.changed = 0
Synchronization.__init__(self)
def addObserver(self, observer):
if observer not in self.obs:
self.obs.append(observer)
def deleteObserver(self, observer):
self.obs.remove(observer)
def notifyObservers(self, arg=None):
'''If 'changed' indicates that this object
has changed, notify all its observers, then
call clearChanged(). Each observer has its
update() called with two arguments: this
observable object and the generic 'arg'.'''
self.mutex.acquire()
try:
if not self.changed:
return
# Make a local copy in case of synchronous
# additions of observers:
localArray = self.obs[:]
self.clearChanged()
finally:
self.mutex.release()
# Update observers
for observer in localArray:
observer.update(self, arg)
def deleteObservers(self):
self.obs = []
def setChanged(self):
self.changed = 1
def clearChanged(self):
self.changed = 0
def hasChanged(self):
return self.changed
def countObservers(self):
return len(self.obs)
synchronize(Observable,
"addObserver deleteObserver deleteObservers " +
"setChanged clearChanged hasChanged " +
"countObservers")
#:~
|