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Sven Franck
erp5
Commits
fe78ac9c
Commit
fe78ac9c
authored
Jan 13, 2012
by
Julien Muchembled
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ConflictFreeLog: fix conflict resolution
parent
5161a9e3
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1
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1 changed file
with
17 additions
and
3 deletions
+17
-3
product/ERP5Type/ConflictFree.py
product/ERP5Type/ConflictFree.py
+17
-3
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product/ERP5Type/ConflictFree.py
View file @
fe78ac9c
...
@@ -2,6 +2,9 @@ from persistent import Persistent
...
@@ -2,6 +2,9 @@ from persistent import Persistent
class
ConflictFreeLog
(
Persistent
):
class
ConflictFreeLog
(
Persistent
):
"""Scalable conflict-free append-only double-linked list
"""Scalable conflict-free append-only double-linked list
Wasted ZODB space due to conflicts is roughly proportional to the number of
clients that continuously add items at the same time.
"""
"""
_prev
=
_next
=
None
_prev
=
_next
=
None
_tail_count
=
0
_tail_count
=
0
...
@@ -70,9 +73,20 @@ class ConflictFreeLog(Persistent):
...
@@ -70,9 +73,20 @@ class ConflictFreeLog(Persistent):
break
break
def
_p_resolveConflict
(
self
,
old_state
,
saved_state
,
new_state
):
def
_p_resolveConflict
(
self
,
old_state
,
saved_state
,
new_state
):
if
old_state
.
get
(
'_tail_count'
,
0
)
==
new_state
.
get
(
'_tail_count'
,
0
):
# May be called for the head and its predecessor.
i
=
len
(
old_state
[
'_log'
])
old_tail_count
=
old_state
.
get
(
'_tail_count'
,
0
)
else
:
d
=
new_state
.
get
(
'_tail_count'
,
0
)
-
old_tail_count
if
d
:
if
old_tail_count
==
saved_state
.
get
(
'_tail_count'
,
0
):
# We are the first one to rotate. Really rotate.
# Only the head conflicts in this case.
return
dict
(
new_state
,
_log
=
saved_state
[
'_log'
][
d
:]
+
new_state
[
'_log'
])
# Another node rotated before us. Revert our rotation.
# Both the head and its predecessor conflict.
i
=
0
i
=
0
else
:
# We didn't rotate. Just add our items to saved head.
# Only the head conflicts.
i
=
len
(
old_state
[
'_log'
])
saved_state
[
'_log'
].
extend
(
new_state
[
'_log'
][
i
:])
saved_state
[
'_log'
].
extend
(
new_state
[
'_log'
][
i
:])
return
saved_state
return
saved_state
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