summaryrefslogtreecommitdiff
path: root/u1db/vectorclock.py
diff options
context:
space:
mode:
authordrebs <drebs@leap.se>2012-11-29 10:56:49 -0200
committerdrebs <drebs@leap.se>2012-11-29 10:56:49 -0200
commite23d579d8bc849408745c196a2794e145743f7d1 (patch)
tree360a55446373fbe2f4c86c746a7f4f92582efd14 /u1db/vectorclock.py
parenta1ca18c131d37235f0bc125c55ca0dfb271f16a7 (diff)
add u1db code (not as submodule)
Diffstat (limited to 'u1db/vectorclock.py')
-rw-r--r--u1db/vectorclock.py89
1 files changed, 89 insertions, 0 deletions
diff --git a/u1db/vectorclock.py b/u1db/vectorclock.py
new file mode 100644
index 00000000..42bceaa8
--- /dev/null
+++ b/u1db/vectorclock.py
@@ -0,0 +1,89 @@
+# Copyright 2011 Canonical Ltd.
+#
+# This file is part of u1db.
+#
+# u1db is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License version 3
+# as published by the Free Software Foundation.
+#
+# u1db is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with u1db. If not, see <http://www.gnu.org/licenses/>.
+
+"""VectorClockRev helper class."""
+
+
+class VectorClockRev(object):
+ """Track vector clocks for multiple replica ids.
+
+ This allows simple comparison to determine if one VectorClockRev is
+ newer/older/in-conflict-with another VectorClockRev without having to
+ examine history. Every replica has a strictly increasing revision. When
+ creating a new revision, they include all revisions for all other replicas
+ which the new revision dominates, and increment their own revision to
+ something greater than the current value.
+ """
+
+ def __init__(self, value):
+ self._values = self._expand(value)
+
+ def __repr__(self):
+ s = self.as_str()
+ return '%s(%s)' % (self.__class__.__name__, s)
+
+ def as_str(self):
+ s = '|'.join(['%s:%d' % (m, r) for m, r
+ in sorted(self._values.items())])
+ return s
+
+ def _expand(self, value):
+ result = {}
+ if value is None:
+ return result
+ for replica_info in value.split('|'):
+ replica_uid, counter = replica_info.split(':')
+ counter = int(counter)
+ result[replica_uid] = counter
+ return result
+
+ def is_newer(self, other):
+ """Is this VectorClockRev strictly newer than other.
+ """
+ if not self._values:
+ return False
+ if not other._values:
+ return True
+ this_is_newer = False
+ other_expand = dict(other._values)
+ for key, value in self._values.iteritems():
+ if key in other_expand:
+ other_value = other_expand.pop(key)
+ if other_value > value:
+ return False
+ elif other_value < value:
+ this_is_newer = True
+ else:
+ this_is_newer = True
+ if other_expand:
+ return False
+ return this_is_newer
+
+ def increment(self, replica_uid):
+ """Increase the 'replica_uid' section of this vector clock.
+
+ :return: A string representing the new vector clock value
+ """
+ self._values[replica_uid] = self._values.get(replica_uid, 0) + 1
+
+ def maximize(self, other_vcr):
+ for replica_uid, counter in other_vcr._values.iteritems():
+ if replica_uid not in self._values:
+ self._values[replica_uid] = counter
+ else:
+ this_counter = self._values[replica_uid]
+ if this_counter < counter:
+ self._values[replica_uid] = counter