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# Copyright (C) 2005 by Canonical Ltd
# Authors: Robert Collins <robert.collins@canonical.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""Tests for the behaviour of the Transaction concept in bzr."""
# import system imports here
import os
import sys
#import bzrlib specific imports here
import bzrlib.errors as errors
from bzrlib.selftest import TestCase, TestCaseInTempDir
import bzrlib.transactions as transactions
class DummyWeave(object):
"""A class that can be instantiated and compared."""
def __init__(self, message):
self._message = message
def __eq__(self, other):
if other is None:
return False
return self._message == other._message
class TestSymbols(TestCase):
def test_symbols(self):
from bzrlib.transactions import ReadOnlyTransaction
from bzrlib.transactions import PassThroughTransaction
class TestReadOnlyTransaction(TestCase):
def setUp(self):
self.transaction = transactions.ReadOnlyTransaction()
super(TestReadOnlyTransaction, self).setUp()
def test_register_clean(self):
self.transaction.register_clean("anobject")
def test_register_dirty_raises(self):
self.assertRaises(errors.ReadOnlyError,
self.transaction.register_dirty,"anobject")
def test_commit_raises(self):
self.assertRaises(errors.CommitNotPossible, self.transaction.commit)
def test_map(self):
self.assertNotEqual(None, getattr(self.transaction, "map", None))
def test_add_and_get(self):
weave = "a weave"
self.transaction.map.add_weave("id", weave)
self.assertEqual(weave, self.transaction.map.find_weave("id"))
def test_rollback_returns(self):
self.transaction.rollback()
def test_finish_returns(self):
self.transaction.finish()
def test_zero_size_cache(self):
self.transaction.set_cache_size(0)
weave = DummyWeave('a weave')
self.transaction.map.add_weave("id", weave)
self.assertEqual(weave, self.transaction.map.find_weave("id"))
weave = None
# add an object, should fall right out if there are no references
self.transaction.register_clean(self.transaction.map.find_weave("id"))
self.assertEqual(None, self.transaction.map.find_weave("id"))
# but if we have a reference it should stick around
weave = DummyWeave("another weave")
self.transaction.map.add_weave("id", weave)
self.transaction.register_clean(self.transaction.map.find_weave("id"))
self.assertEqual(weave, self.transaction.map.find_weave("id"))
del weave
# its not a weakref system
self.assertEqual(DummyWeave("another weave"),
self.transaction.map.find_weave("id"))
def test_small_cache(self):
self.transaction.set_cache_size(1)
# add an object, should not fall right out if there are no references
#sys.getrefcounts(foo)
self.transaction.map.add_weave("id", DummyWeave("a weave"))
self.transaction.register_clean(self.transaction.map.find_weave("id"))
self.assertEqual(DummyWeave("a weave"),
self.transaction.map.find_weave("id"))
self.transaction.map.add_weave("id2", DummyWeave("a weave also"))
self.transaction.register_clean(self.transaction.map.find_weave("id2"))
# currently a fifo
self.assertEqual(None, self.transaction.map.find_weave("id"))
self.assertEqual(DummyWeave("a weave also"),
self.transaction.map.find_weave("id2"))
def test_small_cache_with_references(self):
# if we have a reference it should stick around
weave = "a weave"
weave2 = "another weave"
self.transaction.map.add_weave("id", weave)
self.transaction.map.add_weave("id2", weave2)
self.assertEqual(weave, self.transaction.map.find_weave("id"))
self.assertEqual(weave2, self.transaction.map.find_weave("id2"))
weave = None
# its not a weakref system
self.assertEqual("a weave", self.transaction.map.find_weave("id"))
def test_precious_with_zero_size_cache(self):
self.transaction.set_cache_size(0)
weave = DummyWeave('a weave')
self.transaction.map.add_weave("id", weave)
self.assertEqual(weave, self.transaction.map.find_weave("id"))
weave = None
# add an object, should not fall out even with no references.
self.transaction.register_clean(self.transaction.map.find_weave("id"),
precious=True)
self.assertEqual(DummyWeave('a weave'),
self.transaction.map.find_weave("id"))
class TestPassThroughTransaction(TestCase):
def test_construct(self):
transactions.PassThroughTransaction()
def test_register_clean(self):
transaction = transactions.PassThroughTransaction()
transaction.register_clean("anobject")
def test_register_dirty(self):
transaction = transactions.PassThroughTransaction()
transaction.register_dirty("anobject")
def test_commit_nothing_returns(self):
transaction = transactions.PassThroughTransaction()
transaction.commit()
def test_map(self):
transaction = transactions.PassThroughTransaction()
self.assertNotEqual(None, getattr(transaction, "map", None))
def test_add_and_get(self):
transaction = transactions.PassThroughTransaction()
weave = "a weave"
transaction.map.add_weave("id", weave)
self.assertEqual(None, transaction.map.find_weave("id"))
def test_rollback_asserts(self):
transaction = transactions.PassThroughTransaction()
self.assertRaises(errors.AlreadyCommitted, transaction.rollback)
def test_finish_returns(self):
transaction = transactions.PassThroughTransaction()
transaction.finish()
def test_cache_is_ignored(self):
transaction = transactions.PassThroughTransaction()
transaction.set_cache_size(100)
weave = "a weave"
transaction.map.add_weave("id", weave)
self.assertEqual(None, transaction.map.find_weave("id"))
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