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Transactions of attributes by inheriting the Transaction class
Basic Usage:
class Test(Transaction):
pass
a = Test()
a.test = "old state"
a.commit()
a.test = "bad state, roll me back"
a.rollback()
assert(a.test == "old state")
See also: http://www.harald-hoyer.de/linux/pythontransactionclass
Copyright (C) 2008 Harald Hoyer <harald@redhat.com>
Copyright (C) 2008 Red Hat, Inc.
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t Transactionc B s2 e Z d Z d „ Z d „ Z d „ Z d „ Z RS( sn
This class allows sub-classes to commit changes to an instance to a
history, and rollback to previous states.
Because the class only stores attributes in self.__dict__ sub-classes
need to use the methods __getstate__ and __setstate__ to provide additional
state information. See the Transactionlist below for an example usage.
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Commit the object state.
If the optional argument "deep" is set to False,
objects of class Transaction stored in this object will
not be committed.
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Rollback the last committed object state.
If the optional argument "deep" is set to False,
objects of class Transaction stored in this object will
not be rolled back.
s Transaction.rollback() %st _rollback_seenNR R t __setstate__( R R
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$ ' t Transactionlistc B sD e Z d Z d „ Z d „ Z d „ Z d „ Z d „ Z d „ Z RS( sÚ
An example subclass of list, which inherits transactions.
Due to the special list implementation, we need the
__getstate__ and __setstate__ methods.
See the code for the implementation.
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Commit the object state.
If the optional argument "deep" is set to False,
objects of class Transaction stored in this object will
not be committed.
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R R t superR4 R R R R R R ( R R R R R! ( ( s: /usr/share/system-config-network/netconfpkg/transaction.pyR Õ s c K sœ t | i d t ƒ ƒ ƒ } t t | ƒ i | t t | ƒ | ƒ o d S| i d t ƒ } | o3 x0 | D]$ } t | t ƒ o | i ƒ ql ql Wn d S( sÙ
Rollback the last committed object state.
If the optional argument "deep" is set to False,
objects of class Transaction stored in this object will
not be rolled back.
R" NR (
R R R5 R4 R( R R R R R ( R R R R R! ( ( s: /usr/share/system-config-network/netconfpkg/transaction.pyR( ì s c C sZ xD | D]< } t | t ƒ o& | i ƒ o t i t d ƒ t Sq q Wt t | ƒ i ƒ S( Ns List val.modified() == True( R R R1 R R
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return a deepcopy of all non Transaction class objects in our list,
and a reference for the committed Transaction objects.
( R R t appendR R ( R R R! ( ( s: /usr/share/system-config-network/netconfpkg/transaction.pyR s c C s | 2| i | ƒ d S( s5 clear the list and restore all objects from the stateN( t extend( R R ( ( s: /usr/share/system-config-network/netconfpkg/transaction.pyR# # s ( R R2 R3 R R( R1 R0 R R# ( ( ( s: /usr/share/system-config-network/netconfpkg/transaction.pyR4 Ì s s Harald Hoyer <harald@redhat.com>(
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