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nexedi
ZODB
Commits
3828451c
Commit
3828451c
authored
Oct 12, 2008
by
Christophe Combelles
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Fix rest formatting (this was unreadable in the apidoc)
parent
d114a74c
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119 deletions
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-119
src/persistent/wref.py
src/persistent/wref.py
+119
-119
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src/persistent/wref.py
View file @
3828451c
...
@@ -28,7 +28,7 @@ class WeakRef(object):
...
@@ -28,7 +28,7 @@ class WeakRef(object):
object to be called when the object is removed from the database.
object to be called when the object is removed from the database.
Here's an example. We'll start by creating a persistent object and
Here's an example. We'll start by creating a persistent object and
a refer
nce to it
:
a refer
ence to it:
:
>>> import persistent, ZODB.tests.MinPO
>>> import persistent, ZODB.tests.MinPO
>>> import ZODB.tests.util
>>> import ZODB.tests.util
...
@@ -37,12 +37,12 @@ class WeakRef(object):
...
@@ -37,12 +37,12 @@ class WeakRef(object):
>>> ref() is ob
>>> ref() is ob
True
True
The hash of the ref if the same as the hash of the referenced object:
The hash of the ref if the same as the hash of the referenced object:
:
>>> hash(ref) == hash(ob)
>>> hash(ref) == hash(ob)
True
True
Two refs to the same object are equal:
Two refs to the same object are equal:
:
>>> WeakRef(ob) == ref
>>> WeakRef(ob) == ref
True
True
...
@@ -51,7 +51,7 @@ class WeakRef(object):
...
@@ -51,7 +51,7 @@ class WeakRef(object):
>>> WeakRef(ob2) == ref
>>> WeakRef(ob2) == ref
False
False
Lets save the reference and the referenced object in a database:
Lets save the reference and the referenced object in a database:
:
>>> db = ZODB.tests.util.DB()
>>> db = ZODB.tests.util.DB()
...
@@ -60,7 +60,7 @@ class WeakRef(object):
...
@@ -60,7 +60,7 @@ class WeakRef(object):
>>> conn1.root()['ref'] = ref
>>> conn1.root()['ref'] = ref
>>> ZODB.tests.util.commit()
>>> ZODB.tests.util.commit()
If we open a new connection, we can use the reference:
If we open a new connection, we can use the reference:
:
>>> conn2 = db.open()
>>> conn2 = db.open()
>>> conn2.root()['ref']() is conn2.root()['ob']
>>> conn2.root()['ref']() is conn2.root()['ob']
...
@@ -68,13 +68,13 @@ class WeakRef(object):
...
@@ -68,13 +68,13 @@ class WeakRef(object):
>>> hash(conn2.root()['ref']) == hash(conn2.root()['ob'])
>>> hash(conn2.root()['ref']) == hash(conn2.root()['ob'])
True
True
But if we delete the referenced object and pack:
But if we delete the referenced object and pack:
:
>>> del conn2.root()['ob']
>>> del conn2.root()['ob']
>>> ZODB.tests.util.commit()
>>> ZODB.tests.util.commit()
>>> ZODB.tests.util.pack(db)
>>> ZODB.tests.util.pack(db)
And then look in a new connection:
And then look in a new connection:
:
>>> conn3 = db.open()
>>> conn3 = db.open()
>>> conn3.root()['ob']
>>> conn3.root()['ob']
...
@@ -82,18 +82,18 @@ class WeakRef(object):
...
@@ -82,18 +82,18 @@ class WeakRef(object):
...
...
KeyError: 'ob'
KeyError: 'ob'
Trying to dereference the reference returns None:
Trying to dereference the reference returns None:
:
>>> conn3.root()['ref']()
>>> conn3.root()['ref']()
Trying to get a hash, raises a type error:
Trying to get a hash, raises a type error:
:
>>> hash(conn3.root()['ref'])
>>> hash(conn3.root()['ref'])
Traceback (most recent call last):
Traceback (most recent call last):
...
...
TypeError: Weakly-referenced object has gone away
TypeError: Weakly-referenced object has gone away
Always explicitly close databases
: :)
Always explicitly close databases
:) ::
>>> db.close()
>>> db.close()
...
@@ -142,7 +142,7 @@ class PersistentWeakKeyDictionary(Persistent):
...
@@ -142,7 +142,7 @@ class PersistentWeakKeyDictionary(Persistent):
of items is extremely lazy. See below.
of items is extremely lazy. See below.
We'll start by creating a PersistentWeakKeyDictionary and adding
We'll start by creating a PersistentWeakKeyDictionary and adding
some persistent objects to it
.
some persistent objects to it
::
>>> d = PersistentWeakKeyDictionary()
>>> d = PersistentWeakKeyDictionary()
>>> import ZODB.tests.util
>>> import ZODB.tests.util
...
@@ -153,23 +153,23 @@ class PersistentWeakKeyDictionary(Persistent):
...
@@ -153,23 +153,23 @@ class PersistentWeakKeyDictionary(Persistent):
>>> d[p2] = 2
>>> d[p2] = 2
>>> d[p3] = 3
>>> d[p3] = 3
We'll create an extra persistent object that's not in the dict:
We'll create an extra persistent object that's not in the dict:
:
>>> p4 = ZODB.tests.util.P('p4')
>>> p4 = ZODB.tests.util.P('p4')
Now we'll excercise iteration and item access:
Now we'll excercise iteration and item access:
:
>>> l = [(str(k), d[k], d.get(k)) for k in d]
>>> l = [(str(k), d[k], d.get(k)) for k in d]
>>> l.sort()
>>> l.sort()
>>> l
>>> l
[('P(p1)', 1, 1), ('P(p2)', 2, 2), ('P(p3)', 3, 3)]
[('P(p1)', 1, 1), ('P(p2)', 2, 2), ('P(p3)', 3, 3)]
And the containment operator:
And the containment operator:
:
>>> [p in d for p in [p1, p2, p3, p4]]
>>> [p in d for p in [p1, p2, p3, p4]]
[True, True, True, False]
[True, True, True, False]
We can add the dict and the referenced objects to a database:
We can add the dict and the referenced objects to a database:
:
>>> db = ZODB.tests.util.DB()
>>> db = ZODB.tests.util.DB()
...
@@ -180,7 +180,7 @@ class PersistentWeakKeyDictionary(Persistent):
...
@@ -180,7 +180,7 @@ class PersistentWeakKeyDictionary(Persistent):
>>> conn1.root()['p3'] = p3
>>> conn1.root()['p3'] = p3
>>> ZODB.tests.util.commit()
>>> ZODB.tests.util.commit()
And things still work, as before:
And things still work, as before:
:
>>> l = [(str(k), d[k], d.get(k)) for k in d]
>>> l = [(str(k), d[k], d.get(k)) for k in d]
>>> l.sort()
>>> l.sort()
...
@@ -190,7 +190,7 @@ class PersistentWeakKeyDictionary(Persistent):
...
@@ -190,7 +190,7 @@ class PersistentWeakKeyDictionary(Persistent):
[True, True, True, False]
[True, True, True, False]
Likewise, we can read the objects from another connection and
Likewise, we can read the objects from another connection and
things still work
.
things still work
::
>>> conn2 = db.open()
>>> conn2 = db.open()
>>> d = conn2.root()['d']
>>> d = conn2.root()['d']
...
@@ -205,18 +205,18 @@ class PersistentWeakKeyDictionary(Persistent):
...
@@ -205,18 +205,18 @@ class PersistentWeakKeyDictionary(Persistent):
[True, True, True, False]
[True, True, True, False]
Now, we'll delete one of the objects from the database, but *not*
Now, we'll delete one of the objects from the database, but *not*
from the dictionary:
from the dictionary:
:
>>> del conn2.root()['p2']
>>> del conn2.root()['p2']
>>> ZODB.tests.util.commit()
>>> ZODB.tests.util.commit()
And pack the database, so that the no-longer referenced p2 is
And pack the database, so that the no-longer referenced p2 is
actually removed from the database
.
actually removed from the database
::
>>> ZODB.tests.util.pack(db)
>>> ZODB.tests.util.pack(db)
Now if we access the dictionary in a new connection, it no longer
Now if we access the dictionary in a new connection, it no longer
has p2:
has p2:
:
>>> conn3 = db.open()
>>> conn3 = db.open()
>>> d = conn3.root()['d']
>>> d = conn3.root()['d']
...
@@ -229,7 +229,7 @@ class PersistentWeakKeyDictionary(Persistent):
...
@@ -229,7 +229,7 @@ class PersistentWeakKeyDictionary(Persistent):
conn1 and conn2 still have p2, because p2 is still in the caches
conn1 and conn2 still have p2, because p2 is still in the caches
for those connections.
for those connections.
Always explicitly close databases
: :)
Always explicitly close databases
:) ::
>>> db.close()
>>> db.close()
...
@@ -269,7 +269,7 @@ class PersistentWeakKeyDictionary(Persistent):
...
@@ -269,7 +269,7 @@ class PersistentWeakKeyDictionary(Persistent):
del
self
.
data
[
WeakRef
(
key
)]
del
self
.
data
[
WeakRef
(
key
)]
def
get
(
self
,
key
,
default
=
None
):
def
get
(
self
,
key
,
default
=
None
):
"""D.get(k[, d]) -> D[k] if k in D, else d.
"""D.get(k[, d]) -> D[k] if k in D, else d.
::
>>> import ZODB.tests.util
>>> import ZODB.tests.util
>>> key = ZODB.tests.util.P("key")
>>> key = ZODB.tests.util.P("key")
...
...
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