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breezy/tests/test_transactions.py
1
 
# Copyright (C) 2005, 2006, 2009, 2011 Canonical Ltd
2
 
#   Authors: Robert Collins <robert.collins@canonical.com>
3
 
#
4
 
# This program is free software; you can redistribute it and/or modify
5
 
# it under the terms of the GNU General Public License as published by
6
 
# the Free Software Foundation; either version 2 of the License, or
7
 
# (at your option) any later version.
8
 
#
9
 
# This program is distributed in the hope that it will be useful,
10
 
# but WITHOUT ANY WARRANTY; without even the implied warranty of
11
 
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12
 
# GNU General Public License for more details.
13
 
#
14
 
# You should have received a copy of the GNU General Public License
15
 
# along with this program; if not, write to the Free Software
16
 
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17
 
 
18
 
"""Tests for the behaviour of the Transaction concept in bzr."""
19
 
 
20
 
# import breezy specific imports here
21
 
import breezy.errors as errors
22
 
from breezy.tests import TestCase
23
 
import breezy.transactions as transactions
24
 
 
25
 
 
26
 
class DummyWeave(object):
27
 
    """A class that can be instantiated and compared."""
28
 
 
29
 
    def __init__(self, message):
30
 
        self._message = message
31
 
        self.finished = False
32
 
 
33
 
    def __eq__(self, other):
34
 
        if other is None:
35
 
            return False
36
 
        return self._message == other._message
37
 
 
38
 
    def __hash__(self):
39
 
        return hash((type(self), self._message))
40
 
 
41
 
    def transaction_finished(self):
42
 
        self.finished = True
43
 
 
44
 
 
45
 
class TestSymbols(TestCase):
46
 
 
47
 
    def test_public_symbols(self):
48
 
        from breezy.transactions import ReadOnlyTransaction  # noqa: F401
49
 
        from breezy.transactions import PassThroughTransaction  # noqa: F401
50
 
 
51
 
 
52
 
class TestReadOnlyTransaction(TestCase):
53
 
 
54
 
    def setUp(self):
55
 
        self.transaction = transactions.ReadOnlyTransaction()
56
 
        super(TestReadOnlyTransaction, self).setUp()
57
 
 
58
 
    def test_register_clean(self):
59
 
        self.transaction.register_clean("anobject")
60
 
 
61
 
    def test_register_dirty_raises(self):
62
 
        self.assertRaises(errors.ReadOnlyError,
63
 
                          self.transaction.register_dirty, "anobject")
64
 
 
65
 
    def test_map(self):
66
 
        self.assertNotEqual(None, getattr(self.transaction, "map", None))
67
 
 
68
 
    def test_add_and_get(self):
69
 
        weave = "a weave"
70
 
        self.transaction.map.add_weave("id", weave)
71
 
        self.assertEqual(weave, self.transaction.map.find_weave("id"))
72
 
 
73
 
    def test_finish_returns(self):
74
 
        self.transaction.finish()
75
 
 
76
 
    def test_finish_does_not_tell_versioned_file_finished(self):
77
 
        # read only transactions never write, so theres no
78
 
        # need to inform versioned files about finishing
79
 
        weave = DummyWeave('a weave')
80
 
        self.transaction.finish()
81
 
        self.assertFalse(weave.finished)
82
 
 
83
 
    def test_zero_size_cache(self):
84
 
        self.transaction.set_cache_size(0)
85
 
        weave = DummyWeave('a weave')
86
 
        self.transaction.map.add_weave("id", weave)
87
 
        self.assertEqual(weave, self.transaction.map.find_weave("id"))
88
 
        weave = None
89
 
        # add an object, should fall right out if there are no references
90
 
        self.transaction.register_clean(self.transaction.map.find_weave("id"))
91
 
        self.assertEqual(None, self.transaction.map.find_weave("id"))
92
 
        # but if we have a reference it should stick around
93
 
        weave = DummyWeave("another weave")
94
 
        self.transaction.map.add_weave("id", weave)
95
 
        self.transaction.register_clean(self.transaction.map.find_weave("id"))
96
 
        self.assertEqual(weave, self.transaction.map.find_weave("id"))
97
 
        del weave
98
 
        # its not a weakref system
99
 
        self.assertEqual(DummyWeave("another weave"),
100
 
                         self.transaction.map.find_weave("id"))
101
 
 
102
 
    def test_small_cache(self):
103
 
        self.transaction.set_cache_size(1)
104
 
        # add an object, should not fall right out if there are no references
105
 
        # sys.getrefcounts(foo)
106
 
        self.transaction.map.add_weave("id", DummyWeave("a weave"))
107
 
        self.transaction.register_clean(self.transaction.map.find_weave("id"))
108
 
        self.assertEqual(DummyWeave("a weave"),
109
 
                         self.transaction.map.find_weave("id"))
110
 
        self.transaction.map.add_weave("id2", DummyWeave("a weave also"))
111
 
        self.transaction.register_clean(self.transaction.map.find_weave("id2"))
112
 
        # currently a fifo
113
 
        self.assertEqual(None, self.transaction.map.find_weave("id"))
114
 
        self.assertEqual(DummyWeave("a weave also"),
115
 
                         self.transaction.map.find_weave("id2"))
116
 
 
117
 
    def test_small_cache_with_references(self):
118
 
        # if we have a reference it should stick around
119
 
        weave = "a weave"
120
 
        weave2 = "another weave"
121
 
        self.transaction.map.add_weave("id", weave)
122
 
        self.transaction.map.add_weave("id2", weave2)
123
 
        self.assertEqual(weave, self.transaction.map.find_weave("id"))
124
 
        self.assertEqual(weave2, self.transaction.map.find_weave("id2"))
125
 
        weave = None
126
 
        # its not a weakref system
127
 
        self.assertEqual("a weave", self.transaction.map.find_weave("id"))
128
 
 
129
 
    def test_precious_with_zero_size_cache(self):
130
 
        self.transaction.set_cache_size(0)
131
 
        weave = DummyWeave('a weave')
132
 
        self.transaction.map.add_weave("id", weave)
133
 
        self.assertEqual(weave, self.transaction.map.find_weave("id"))
134
 
        weave = None
135
 
        # add an object, should not fall out even with no references.
136
 
        self.transaction.register_clean(self.transaction.map.find_weave("id"),
137
 
                                        precious=True)
138
 
        self.assertEqual(DummyWeave('a weave'),
139
 
                         self.transaction.map.find_weave("id"))
140
 
 
141
 
    def test_writable(self):
142
 
        self.assertFalse(self.transaction.writeable())
143
 
 
144
 
 
145
 
class TestPassThroughTransaction(TestCase):
146
 
 
147
 
    def test_construct(self):
148
 
        transactions.PassThroughTransaction()
149
 
 
150
 
    def test_register_clean(self):
151
 
        transaction = transactions.PassThroughTransaction()
152
 
        transaction.register_clean("anobject")
153
 
 
154
 
    def test_register_dirty(self):
155
 
        transaction = transactions.PassThroughTransaction()
156
 
        transaction.register_dirty("anobject")
157
 
 
158
 
    def test_map(self):
159
 
        transaction = transactions.PassThroughTransaction()
160
 
        self.assertNotEqual(None, getattr(transaction, "map", None))
161
 
 
162
 
    def test_add_and_get(self):
163
 
        transaction = transactions.PassThroughTransaction()
164
 
        weave = "a weave"
165
 
        transaction.map.add_weave("id", weave)
166
 
        self.assertEqual(None, transaction.map.find_weave("id"))
167
 
 
168
 
    def test_finish_returns(self):
169
 
        transaction = transactions.PassThroughTransaction()
170
 
        transaction.finish()
171
 
 
172
 
    def test_finish_tells_versioned_file_finished(self):
173
 
        # pass through transactions allow writes so they
174
 
        # need to inform versioned files about finishing
175
 
        weave = DummyWeave('a weave')
176
 
        transaction = transactions.PassThroughTransaction()
177
 
        transaction.register_dirty(weave)
178
 
        transaction.finish()
179
 
        self.assertTrue(weave.finished)
180
 
 
181
 
    def test_cache_is_ignored(self):
182
 
        transaction = transactions.PassThroughTransaction()
183
 
        transaction.set_cache_size(100)
184
 
        weave = "a weave"
185
 
        transaction.map.add_weave("id", weave)
186
 
        self.assertEqual(None, transaction.map.find_weave("id"))
187
 
 
188
 
    def test_writable(self):
189
 
        transaction = transactions.PassThroughTransaction()
190
 
        self.assertTrue(transaction.writeable())
191
 
 
192
 
 
193
 
class TestWriteTransaction(TestCase):
194
 
 
195
 
    def setUp(self):
196
 
        self.transaction = transactions.WriteTransaction()
197
 
        super(TestWriteTransaction, self).setUp()
198
 
 
199
 
    def test_register_clean(self):
200
 
        self.transaction.register_clean("anobject")
201
 
 
202
 
    def test_register_dirty(self):
203
 
        self.transaction.register_dirty("anobject")
204
 
 
205
 
    def test_map(self):
206
 
        self.assertNotEqual(None, getattr(self.transaction, "map", None))
207
 
 
208
 
    def test_add_and_get(self):
209
 
        weave = "a weave"
210
 
        self.transaction.map.add_weave("id", weave)
211
 
        self.assertEqual(weave, self.transaction.map.find_weave("id"))
212
 
 
213
 
    def test_finish_returns(self):
214
 
        self.transaction.finish()
215
 
 
216
 
    def test_finish_tells_versioned_file_finished(self):
217
 
        # write transactions allow writes so they
218
 
        # need to inform versioned files about finishing
219
 
        weave = DummyWeave('a weave')
220
 
        self.transaction.register_dirty(weave)
221
 
        self.transaction.finish()
222
 
        self.assertTrue(weave.finished)
223
 
 
224
 
    def test_zero_size_cache(self):
225
 
        self.transaction.set_cache_size(0)
226
 
        # add an object, should fall right out if there are no references
227
 
        weave = DummyWeave('a weave')
228
 
        self.transaction.map.add_weave("id", weave)
229
 
        self.assertEqual(weave, self.transaction.map.find_weave("id"))
230
 
        weave = None
231
 
        self.transaction.register_clean(self.transaction.map.find_weave("id"))
232
 
        self.assertEqual(None, self.transaction.map.find_weave("id"))
233
 
        # but if we have a reference to a clean object it should stick around
234
 
        weave = DummyWeave("another weave")
235
 
        self.transaction.map.add_weave("id", weave)
236
 
        self.transaction.register_clean(self.transaction.map.find_weave("id"))
237
 
        self.assertEqual(weave, self.transaction.map.find_weave("id"))
238
 
        del weave
239
 
        # its not a weakref system
240
 
        self.assertEqual(DummyWeave("another weave"),
241
 
                         self.transaction.map.find_weave("id"))
242
 
 
243
 
    def test_zero_size_cache_dirty_objects(self):
244
 
        self.transaction.set_cache_size(0)
245
 
        # add a dirty object, which should not fall right out.
246
 
        weave = DummyWeave('a weave')
247
 
        self.transaction.map.add_weave("id", weave)
248
 
        self.assertEqual(weave, self.transaction.map.find_weave("id"))
249
 
        weave = None
250
 
        self.transaction.register_dirty(self.transaction.map.find_weave("id"))
251
 
        self.assertNotEqual(None, self.transaction.map.find_weave("id"))
252
 
 
253
 
    def test_clean_to_dirty(self):
254
 
        # a clean object may become dirty.
255
 
        weave = DummyWeave('A weave')
256
 
        self.transaction.map.add_weave("id", weave)
257
 
        self.transaction.register_clean(weave)
258
 
        self.transaction.register_dirty(weave)
259
 
        self.assertTrue(self.transaction.is_dirty(weave))
260
 
        self.assertFalse(self.transaction.is_clean(weave))
261
 
 
262
 
    def test_small_cache(self):
263
 
        self.transaction.set_cache_size(1)
264
 
        # add an object, should not fall right out if there are no references
265
 
        # sys.getrefcounts(foo)
266
 
        self.transaction.map.add_weave("id", DummyWeave("a weave"))
267
 
        self.transaction.register_clean(self.transaction.map.find_weave("id"))
268
 
        self.assertEqual(DummyWeave("a weave"),
269
 
                         self.transaction.map.find_weave("id"))
270
 
        self.transaction.map.add_weave("id2", DummyWeave("a weave also"))
271
 
        self.transaction.register_clean(self.transaction.map.find_weave("id2"))
272
 
        # currently a fifo
273
 
        self.assertEqual(None, self.transaction.map.find_weave("id"))
274
 
        self.assertEqual(DummyWeave("a weave also"),
275
 
                         self.transaction.map.find_weave("id2"))
276
 
 
277
 
    def test_small_cache_with_references(self):
278
 
        # if we have a reference it should stick around
279
 
        weave = "a weave"
280
 
        weave2 = "another weave"
281
 
        self.transaction.map.add_weave("id", weave)
282
 
        self.transaction.map.add_weave("id2", weave2)
283
 
        self.assertEqual(weave, self.transaction.map.find_weave("id"))
284
 
        self.assertEqual(weave2, self.transaction.map.find_weave("id2"))
285
 
        weave = None
286
 
        # its not a weakref system
287
 
        self.assertEqual("a weave", self.transaction.map.find_weave("id"))
288
 
 
289
 
    def test_precious_with_zero_size_cache(self):
290
 
        self.transaction.set_cache_size(0)
291
 
        weave = DummyWeave('a weave')
292
 
        self.transaction.map.add_weave("id", weave)
293
 
        self.assertEqual(weave, self.transaction.map.find_weave("id"))
294
 
        weave = None
295
 
        # add an object, should not fall out even with no references.
296
 
        self.transaction.register_clean(self.transaction.map.find_weave("id"),
297
 
                                        precious=True)
298
 
        self.assertEqual(DummyWeave('a weave'),
299
 
                         self.transaction.map.find_weave("id"))
300
 
 
301
 
    def test_writable(self):
302
 
        self.assertTrue(self.transaction.writeable())