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nexedi
ZODB
Commits
df0ebdb6
Commit
df0ebdb6
authored
Oct 26, 2004
by
Fred Drake
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document _p_invalidate()
parent
8ff1520f
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src/persistent/interfaces.py
src/persistent/interfaces.py
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src/persistent/interfaces.py
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df0ebdb6
...
@@ -140,7 +140,8 @@ class IPersistent(Interface):
...
@@ -140,7 +140,8 @@ class IPersistent(Interface):
- call _p_deactivate()
- call _p_deactivate()
- set _p_changed to None
- set _p_changed to None
There is one way to invalidate an object: delete its _p_changed
There are two ways to invalidate an object: call the
_p_invalidate() method (preferred) or delete its _p_changed
attribute. This cannot be ignored, and is used when semantics
attribute. This cannot be ignored, and is used when semantics
require invalidation. Normally, an invalidated object transitions
require invalidation. Normally, an invalidated object transitions
to the ghost state. However, some objects cannot be ghosts. When
to the ghost state. However, some objects cannot be ghosts. When
...
@@ -226,6 +227,15 @@ class IPersistent(Interface):
...
@@ -226,6 +227,15 @@ class IPersistent(Interface):
may choose to keep an object in the saved state.
may choose to keep an object in the saved state.
"""
"""
def
_p_invalidate
():
"""Invalidate the object.
Invalidate the object. This causes any data to be thrown
away, even if the object is inthe changed state. The object
is moved to the ghost state; further accesses will cause
object data to be reloaded.
"""
class
IPersistentNoReadConflicts
(
IPersistent
):
class
IPersistentNoReadConflicts
(
IPersistent
):
def
_p_independent
():
def
_p_independent
():
"""Hook for subclasses to prevent read conflict errors.
"""Hook for subclasses to prevent read conflict errors.
...
...
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