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nexedi
ZEO
Commits
803364dd
Commit
803364dd
authored
Oct 23, 1998
by
Jim Fulton
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src/ZODB/Persistence.py
src/ZODB/Persistence.py
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src/ZODB/Persistence.py
View file @
803364dd
...
@@ -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 1.1
4 1998/07/02 16:17:44
jim Exp $'''
$Id: Persistence.py,v 1.1
5 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: 1.1
4
$'
[
11
:
-
2
]
__version__
=
'$Revision: 1.1
5
$'
[
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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