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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 @@
__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 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 $'''
#
# (540) 371-6909
#
__version__='$Revision: 1.14 $'[11:-2]
__version__='$Revision: 1.15 $'[11:-2]
try:
from cPersistence import Persistent
except:
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
data is not immediately loaded. Loading of the objects data is
defered until an attempt is made to access an attribute of the
object.
When a persistent object is loaded from a database, the object's
data is not immediately loaded. Loading of the objects data is
defered until an attempt is made to access an attribute of the
object.
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
of subclasses that change state other than by setting attributes
should: 'self.__changed__(1)' to flag instances as changed.
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
of subclasses that change state other than by setting attributes
should: 'self.__changed__(1)' to flag instances as changed.
You must not override the object's '__getattr__' and '__setattr__'
methods. If you override the objects '__getstate__' method, then
you must be careful not to include any attributes with names
starting with '_p_' or '_v_' in the state.
You must not override the object's '__getattr__' and '__setattr__'
methods. If you override the objects '__getstate__' method, then
you must be careful not to include any attributes with names
starting with '_p_' or '_v_' in the state.
"""
_p_oid=None # A Persistent object-id, unique within a jar
_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_oid=None # A Persistent object-id, unique within a jar
_p_changed=0 # The object state: None=ghost, 0=normal, 1=changed
_p_jar=None # The last jar that this object was stored in.
def _p___init__(self,oid,jar):
"""Post creation initialization
def _p___init__(self,oid,jar):
"""Post creation initialization
This is *only* used if we have __getinitargs__!
"""
d=self.__dict__
if d:
newstate={}
for key in d.keys():
if key[:3] != '_p_':
newstate[key]=d[key]
del d[key]
if newstate: d['_p_newstate']=newstate
d['_p_oid']=oid
d['_p_jar']=jar
d['_p_changed']=None
This is *only* used if we have __getinitargs__!
"""
d=self.__dict__
if d:
newstate={}
for key in d.keys():
if key[:3] != '_p_':
newstate[key]=d[key]
del d[key]
if newstate: d['_p_newstate']=newstate
d['_p_oid']=oid
d['_p_jar']=jar
d['_p_changed']=None
def _p_deactivate(self,copy=None):
if copy is None: newstate=None
else: newstate=copy.__dict__
d=self.__dict__
oid=self._p_oid
jar=self._p_jar
d.clear()
if newstate: d['_p_newstate']=newstate
d['_p_oid']=oid
d['_p_jar']=jar
d['_p_changed']=None
def _p_deactivate(self,copy=None):
if copy is None: newstate=None
else: newstate=copy.__dict__
d=self.__dict__
oid=self._p_oid
jar=self._p_jar
d.clear()
if newstate: d['_p_newstate']=newstate
d['_p_oid']=oid
d['_p_jar']=jar
d['_p_changed']=None
_p___reinit=_p_deactivate # Back. Comp.
def __getattr__(self,key):
'Get an item'
if self._p_changed is None and key[:3] != '_p_':
self._p_jar.setstate(self)
if self.__dict__.has_key(key): return self.__dict__[key]
_p___reinit=_p_deactivate # Back. Comp.
def __getattr__(self,key):
'Get an item'
if self._p_changed is None and key[:3] != '_p_':
self._p_jar.setstate(self)
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
if changed:
self.__dict__[key]=value
return
k=key[:3]
if k=='_p_' or k=='_v_':
self.__dict__[key]=value
return
if k=='_p_' or k=='_v_':
self.__dict__[key]=value
return
jar=self._p_jar
jar=self._p_jar
if jar is None:
self.__dict__[key]=value
return
self.__dict__[key]=value
return
d=self.__dict__
if changed is None:
if changed is None:
d['_p_changed']=1
jar.setstate(self)
d[key]=value
d[key]=value
try:
get_transaction().register(self)
d['_p_changed']=1
except: pass
def __changed__(self,v=-1):
old=self._p_changed
if v != -1:
if v and not old and self._p_jar is not None:
try: get_transaction().register(self)
except: pass
self._p_changed = not not v
def __changed__(self,v=-1):
old=self._p_changed
if v != -1:
if v and not old and self._p_jar is not None:
try: get_transaction().register(self)
except: pass
self._p_changed = not not v
return old
def __getstate__(self):
# First, update my state, if necessary:
if self._p_changed is None: self._p_jar.setstate(self)
return old
def __getstate__(self):
# First, update my state, if necessary:
if self._p_changed is None: self._p_jar.setstate(self)
state={}
d=self.__dict__
for k,v in d.items():
if k[:3] != '_p_' and k[:3] != '_v_': state[k]=v
return state
state={}
d=self.__dict__
for k,v in d.items():
if k[:3] != '_p_' and k[:3] != '_v_': state[k]=v
return state
def __setstate__(self,state):
d=self.__dict__
for k,v in state.items(): d[k]=v
return state
def __setstate__(self,state):
d=self.__dict__
for k,v in state.items(): d[k]=v
return state
def __save__(self):
'''\
Update the object in a persistent database.
'''
jar=self._p_jar
if jar and self._p_changed: jar.store(self)
def __save__(self):
'''\
Update the object in a persistent database.
'''
jar=self._p_jar
if jar and self._p_changed: jar.store(self)
def __repr__(self):
' '
return '<%s instance at %s>' % (self.__class__.__name__,
hex(id(self)))
def __repr__(self):
' '
return '<%s instance at %s>' % (self.__class__.__name__,
hex(id(self)))
def __inform_commit__(self,T,start_time):
jar=self._p_jar
if jar and self._p_changed: jar.store(self,T)
def __inform_commit__(self,T,start_time):
jar=self._p_jar
if jar and self._p_changed: jar.store(self,T)
def __inform_abort__(self,T,start_time):
try: self._p_jar.abort(self,start_time)
except: pass
def __inform_abort__(self,T,start_time):
try: self._p_jar.abort(self,start_time)
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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