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Commit 803364dd authored by Jim Fulton's avatar Jim Fulton
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src/ZODB/Persistence.py
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...@@ -3,7 +3,7 @@ ...@@ -3,7 +3,7 @@
__doc__='''Python implementation of a persistent base types __doc__='''Python implementation of a persistent base types
$Id: Persistence.py,v 1.14 1998/07/02 16:17:44 jim Exp $''' $Id: Persistence.py,v 1.15 1998/10/23 21:36:59 jim Exp $'''
# Copyright # Copyright
# #
# Copyright 1996 Digital Creations, L.C., 910 Princess Anne # Copyright 1996 Digital Creations, L.C., 910 Princess Anne
...@@ -58,198 +58,146 @@ $Id: Persistence.py,v 1.14 1998/07/02 16:17:44 jim Exp $''' ...@@ -58,198 +58,146 @@ $Id: Persistence.py,v 1.14 1998/07/02 16:17:44 jim Exp $'''
# #
# (540) 371-6909 # (540) 371-6909
# #
__version__='$Revision: 1.14 $'[11:-2] __version__='$Revision: 1.15 $'[11:-2]
try: try:
from cPersistence import Persistent from cPersistence import Persistent
except: except:
class Persistent: class Persistent:
"""\ """\
Persistent object support mix-in class Persistent object support mix-in class
When a persistent object is loaded from a database, the object's When a persistent object is loaded from a database, the object's
data is not immediately loaded. Loading of the objects data is data is not immediately loaded. Loading of the objects data is
defered until an attempt is made to access an attribute of the defered until an attempt is made to access an attribute of the
object. object.
The object also tries to keep track of whether it has changed. It The object also tries to keep track of whether it has changed. It
is easy for this to be done incorrectly. For this reason, methods is easy for this to be done incorrectly. For this reason, methods
of subclasses that change state other than by setting attributes of subclasses that change state other than by setting attributes
should: 'self.__changed__(1)' to flag instances as changed. should: 'self.__changed__(1)' to flag instances as changed.
You must not override the object's '__getattr__' and '__setattr__' You must not override the object's '__getattr__' and '__setattr__'
methods. If you override the objects '__getstate__' method, then methods. If you override the objects '__getstate__' method, then
you must be careful not to include any attributes with names you must be careful not to include any attributes with names
starting with '_p_' or '_v_' in the state. starting with '_p_' or '_v_' in the state.
""" """
_p_oid=None # A Persistent object-id, unique within a jar _p_oid=None # A Persistent object-id, unique within a jar
_p_changed=0 # The object state: None=ghost, 0=normal, 1=changed _p_changed=0 # The object state: None=ghost, 0=normal, 1=changed
_p_jar=None # The last jar that this object was stored in. _p_jar=None # The last jar that this object was stored in.
def _p___init__(self,oid,jar): def _p___init__(self,oid,jar):
"""Post creation initialization """Post creation initialization
This is *only* used if we have __getinitargs__! This is *only* used if we have __getinitargs__!
""" """
d=self.__dict__ d=self.__dict__
if d: if d:
newstate={} newstate={}
for key in d.keys(): for key in d.keys():
if key[:3] != '_p_': if key[:3] != '_p_':
newstate[key]=d[key] newstate[key]=d[key]
del d[key] del d[key]
if newstate: d['_p_newstate']=newstate if newstate: d['_p_newstate']=newstate
d['_p_oid']=oid d['_p_oid']=oid
d['_p_jar']=jar d['_p_jar']=jar
d['_p_changed']=None d['_p_changed']=None
def _p_deactivate(self,copy=None): def _p_deactivate(self,copy=None):
if copy is None: newstate=None if copy is None: newstate=None
else: newstate=copy.__dict__ else: newstate=copy.__dict__
d=self.__dict__ d=self.__dict__
oid=self._p_oid oid=self._p_oid
jar=self._p_jar jar=self._p_jar
d.clear() d.clear()
if newstate: d['_p_newstate']=newstate if newstate: d['_p_newstate']=newstate
d['_p_oid']=oid d['_p_oid']=oid
d['_p_jar']=jar d['_p_jar']=jar
d['_p_changed']=None d['_p_changed']=None
_p___reinit=_p_deactivate # Back. Comp. _p___reinit=_p_deactivate # Back. Comp.
def __getattr__(self,key): def __getattr__(self,key):
'Get an item' 'Get an item'
if self._p_changed is None and key[:3] != '_p_': if self._p_changed is None and key[:3] != '_p_':
self._p_jar.setstate(self) self._p_jar.setstate(self)
if self.__dict__.has_key(key): return self.__dict__[key] if self.__dict__.has_key(key): return self.__dict__[key]
raise AttributeError, key raise AttributeError, key
def __setattr__(self,key,value): def __setattr__(self,key,value):
' ' ' '
changed=self._p_changed changed=self._p_changed
if changed: if changed:
self.__dict__[key]=value self.__dict__[key]=value
return return
k=key[:3] k=key[:3]
if k=='_p_' or k=='_v_': if k=='_p_' or k=='_v_':
self.__dict__[key]=value self.__dict__[key]=value
return return
jar=self._p_jar jar=self._p_jar
if jar is None: if jar is None:
self.__dict__[key]=value self.__dict__[key]=value
return return
d=self.__dict__ d=self.__dict__
if changed is None: if changed is None:
d['_p_changed']=1 d['_p_changed']=1
jar.setstate(self) jar.setstate(self)
d[key]=value d[key]=value
try: try:
get_transaction().register(self) get_transaction().register(self)
d['_p_changed']=1 d['_p_changed']=1
except: pass except: pass
def __changed__(self,v=-1): def __changed__(self,v=-1):
old=self._p_changed old=self._p_changed
if v != -1: if v != -1:
if v and not old and self._p_jar is not None: if v and not old and self._p_jar is not None:
try: get_transaction().register(self) try: get_transaction().register(self)
except: pass except: pass
self._p_changed = not not v self._p_changed = not not v
return old return old
def __getstate__(self): def __getstate__(self):
# First, update my state, if necessary: # First, update my state, if necessary:
if self._p_changed is None: self._p_jar.setstate(self) if self._p_changed is None: self._p_jar.setstate(self)
state={} state={}
d=self.__dict__ d=self.__dict__
for k,v in d.items(): for k,v in d.items():
if k[:3] != '_p_' and k[:3] != '_v_': state[k]=v if k[:3] != '_p_' and k[:3] != '_v_': state[k]=v
return state return state
def __setstate__(self,state): def __setstate__(self,state):
d=self.__dict__ d=self.__dict__
for k,v in state.items(): d[k]=v for k,v in state.items(): d[k]=v
return state return state
def __save__(self): def __save__(self):
'''\ '''\
Update the object in a persistent database. Update the object in a persistent database.
''' '''
jar=self._p_jar jar=self._p_jar
if jar and self._p_changed: jar.store(self) if jar and self._p_changed: jar.store(self)
def __repr__(self): def __repr__(self):
' ' ' '
return '<%s instance at %s>' % (self.__class__.__name__, return '<%s instance at %s>' % (self.__class__.__name__,
hex(id(self))) hex(id(self)))
def __inform_commit__(self,T,start_time): def __inform_commit__(self,T,start_time):
jar=self._p_jar jar=self._p_jar
if jar and self._p_changed: jar.store(self,T) if jar and self._p_changed: jar.store(self,T)
def __inform_abort__(self,T,start_time): def __inform_abort__(self,T,start_time):
try: self._p_jar.abort(self,start_time) try: self._p_jar.abort(self,start_time)
except: pass except: pass
############################################################################
# $Log: Persistence.py,v $
# Revision 1.14 1998/07/02 16:17:44 jim
# Fixed bug that caused bogus registrations when custom __setstate__
# methods did setattrs.
#
# Revision 1.13 1998/06/05 22:07:05 jim
# Fixed bug in Persistent.__setattr__ that caused changes to
# "volatile" attributes (starting with _v_) to cause database writes.
#
# Revision 1.12 1998/03/12 15:38:51 jim
# Fixed bug in __changed__.
#
# Revision 1.11 1997/12/15 23:01:17 jim
# *** empty log message ***
#
# Revision 1.10 1997/10/30 18:49:22 jim
# Changed abort to use jar's abort method.
#
# Revision 1.9 1997/04/22 00:16:50 jim
# Changed to use new cPersistent header.
#
# Revision 1.8 1997/04/04 13:52:27 jim
# Fixed bug in persistent mapping that caused extraneous records to be
# written.
#
# Revision 1.7 1997/04/03 17:33:32 jim
# Changed to pass transaction to jar store method.
#
# Revision 1.6 1997/03/28 23:04:48 jim
# Changed reinit to tolerate being called with no arguments.
#
# Revision 1.5 1997/03/25 20:42:42 jim
# Changed to make all persistent objects transactional.
#
# Revision 1.4 1997/03/14 16:19:55 jim
# Changed so no longer save on del.
# Added check in __save__ so that we don't save if we have decided that
# we haven't changed.
#
# Revision 1.3 1997/03/08 22:03:54 jfulton
# Paul made change to clear method to see if keys exist.
#
# Revision 1.2 1997/03/05 22:59:48 jim
# Added clear method.
#
# Revision 1.1 1997/02/11 13:14:06 jim
# *** empty log message ***
#
#
#
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