|
2890.2.3
by Robert Collins
* New module ``bzrlib.bisect_multi`` with generic multiple-bisection-at-once |
1 |
# Copyright (C) 2007 Canonical Ltd
|
2 |
#
|
|
3 |
# This program is free software; you can redistribute it and/or modify
|
|
4 |
# it under the terms of the GNU General Public License as published by
|
|
5 |
# the Free Software Foundation; either version 2 of the License, or
|
|
6 |
# (at your option) any later version.
|
|
7 |
#
|
|
8 |
# This program is distributed in the hope that it will be useful,
|
|
9 |
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
10 |
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
11 |
# GNU General Public License for more details.
|
|
12 |
#
|
|
13 |
# You should have received a copy of the GNU General Public License
|
|
14 |
# along with this program; if not, write to the Free Software
|
|
15 |
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
16 |
||
17 |
"""Tests for bisect_multi."""
|
|
18 |
||
19 |
from bzrlib import errors |
|
20 |
from bzrlib.bisect_multi import bisect_multi_bytes |
|
21 |
from bzrlib.tests import TestCase |
|
22 |
||
23 |
||
24 |
class TestBisectMultiBytes(TestCase): |
|
25 |
||
26 |
def test_lookup_no_keys_no_calls(self): |
|
27 |
calls = [] |
|
28 |
def missing_content(location_keys): |
|
29 |
calls.append(location_keys) |
|
30 |
return ((location_key, False) for location_key in location_keys) |
|
31 |
self.assertEqual([], |
|
32 |
list(bisect_multi_bytes(missing_content, 100, []))) |
|
33 |
self.assertEqual([], calls) |
|
34 |
||
35 |
def test_lookup_missing_key_no_content(self): |
|
36 |
"""Doing a lookup in a zero-length file still does a single request.
|
|
|
3943.8.1
by Marius Kruger
remove all trailing whitespace from bzr source |
37 |
|
|
2890.2.3
by Robert Collins
* New module ``bzrlib.bisect_multi`` with generic multiple-bisection-at-once |
38 |
This makes sense because the bisector cannot tell how long content is
|
39 |
and its more flexible to only stop when the content object says 'False'
|
|
40 |
for a given location, key pair.
|
|
41 |
"""
|
|
42 |
calls = [] |
|
43 |
def missing_content(location_keys): |
|
44 |
calls.append(location_keys) |
|
45 |
return ((location_key, False) for location_key in location_keys) |
|
46 |
self.assertEqual([], |
|
47 |
list(bisect_multi_bytes(missing_content, 0, ['foo', 'bar']))) |
|
48 |
self.assertEqual([[(0, 'foo'), (0, 'bar')]], calls) |
|
49 |
||
50 |
def test_lookup_missing_key_before_all_others(self): |
|
51 |
calls = [] |
|
52 |
def missing_first_content(location_keys): |
|
53 |
# returns -1 for all keys unless the byte offset is 0 when it
|
|
54 |
# returns False
|
|
55 |
calls.append(location_keys) |
|
56 |
result = [] |
|
57 |
for location_key in location_keys: |
|
58 |
if location_key[0] == 0: |
|
59 |
result.append((location_key, False)) |
|
60 |
else: |
|
61 |
result.append((location_key, -1)) |
|
62 |
return result |
|
63 |
# given a 0 length file, this should terminate with one call.
|
|
64 |
self.assertEqual([], |
|
65 |
list(bisect_multi_bytes(missing_first_content, 0, ['foo', 'bar']))) |
|
66 |
self.assertEqual([[(0, 'foo'), (0, 'bar')]], calls) |
|
67 |
del calls[:] |
|
68 |
# given a 2 length file, this should make two calls - 1, 0.
|
|
69 |
self.assertEqual([], |
|
70 |
list(bisect_multi_bytes(missing_first_content, 2, ['foo', 'bar']))) |
|
71 |
self.assertEqual([ |
|
72 |
[(1, 'foo'), (1, 'bar')], |
|
73 |
[(0, 'foo'), (0, 'bar')], |
|
74 |
], calls) |
|
75 |
del calls[:] |
|
76 |
# given a really long file - 200MB, this should make a series of calls with the
|
|
77 |
# gap between adjactent calls dropping by 50% each time. We choose a
|
|
78 |
# length which just under a power of two to generate a corner case in
|
|
79 |
# bisection - naively using power of two reduction in size can lead to
|
|
80 |
# a very long tail in the bisection process. The current users of
|
|
81 |
# the bisect_multi_bytes api are not expected to be concerned by this,
|
|
82 |
# as the delta gets down to 4K (the minimum we expect to read and
|
|
83 |
# parse) within 16 steps even on a 200MB index (which at 4 keys/K is
|
|
84 |
# 800 thousand keys, and log2 of 800000 is 19 - so we're doing log2
|
|
85 |
# steps in the worst case there.
|
|
86 |
self.assertEqual([], |
|
87 |
list(bisect_multi_bytes( |
|
88 |
missing_first_content,268435456 - 1 , ['foo', 'bar']))) |
|
89 |
self.assertEqual([ |
|
90 |
[(134217727, 'foo'), (134217727, 'bar')], |
|
91 |
[(67108864, 'foo'), (67108864, 'bar')], |
|
92 |
[(33554433, 'foo'), (33554433, 'bar')], |
|
93 |
[(16777218, 'foo'), (16777218, 'bar')], |
|
94 |
[(8388611, 'foo'), (8388611, 'bar')], |
|
95 |
[(4194308, 'foo'), (4194308, 'bar')], |
|
96 |
[(2097157, 'foo'), (2097157, 'bar')], |
|
97 |
[(1048582, 'foo'), (1048582, 'bar')], |
|
98 |
[(524295, 'foo'), (524295, 'bar')], |
|
99 |
[(262152, 'foo'), (262152, 'bar')], |
|
100 |
[(131081, 'foo'), (131081, 'bar')], |
|
101 |
[(65546, 'foo'), (65546, 'bar')], |
|
102 |
[(32779, 'foo'), (32779, 'bar')], |
|
103 |
[(16396, 'foo'), (16396, 'bar')], |
|
104 |
[(8205, 'foo'), (8205, 'bar')], |
|
105 |
[(4110, 'foo'), (4110, 'bar')], |
|
106 |
[(2063, 'foo'), (2063, 'bar')], |
|
107 |
[(1040, 'foo'), (1040, 'bar')], |
|
108 |
[(529, 'foo'), (529, 'bar')], |
|
109 |
[(274, 'foo'), (274, 'bar')], |
|
110 |
[(147, 'foo'), (147, 'bar')], |
|
111 |
[(84, 'foo'), (84, 'bar')], |
|
112 |
[(53, 'foo'), (53, 'bar')], |
|
113 |
[(38, 'foo'), (38, 'bar')], |
|
114 |
[(31, 'foo'), (31, 'bar')], |
|
115 |
[(28, 'foo'), (28, 'bar')], |
|
116 |
[(27, 'foo'), (27, 'bar')], |
|
117 |
[(26, 'foo'), (26, 'bar')], |
|
118 |
[(25, 'foo'), (25, 'bar')], |
|
119 |
[(24, 'foo'), (24, 'bar')], |
|
120 |
[(23, 'foo'), (23, 'bar')], |
|
121 |
[(22, 'foo'), (22, 'bar')], |
|
122 |
[(21, 'foo'), (21, 'bar')], |
|
123 |
[(20, 'foo'), (20, 'bar')], |
|
124 |
[(19, 'foo'), (19, 'bar')], |
|
125 |
[(18, 'foo'), (18, 'bar')], |
|
126 |
[(17, 'foo'), (17, 'bar')], |
|
127 |
[(16, 'foo'), (16, 'bar')], |
|
128 |
[(15, 'foo'), (15, 'bar')], |
|
129 |
[(14, 'foo'), (14, 'bar')], |
|
130 |
[(13, 'foo'), (13, 'bar')], |
|
131 |
[(12, 'foo'), (12, 'bar')], |
|
132 |
[(11, 'foo'), (11, 'bar')], |
|
133 |
[(10, 'foo'), (10, 'bar')], |
|
134 |
[(9, 'foo'), (9, 'bar')], |
|
135 |
[(8, 'foo'), (8, 'bar')], |
|
136 |
[(7, 'foo'), (7, 'bar')], |
|
137 |
[(6, 'foo'), (6, 'bar')], |
|
138 |
[(5, 'foo'), (5, 'bar')], |
|
139 |
[(4, 'foo'), (4, 'bar')], |
|
140 |
[(3, 'foo'), (3, 'bar')], |
|
141 |
[(2, 'foo'), (2, 'bar')], |
|
142 |
[(1, 'foo'), (1, 'bar')], |
|
143 |
[(0, 'foo'), (0, 'bar')], |
|
144 |
], calls) |
|
145 |
||
146 |
def test_lookup_missing_key_after_all_others(self): |
|
147 |
calls = [] |
|
148 |
end = None |
|
149 |
def missing_last_content(location_keys): |
|
150 |
# returns +1 for all keys unless the byte offset is 'end' when it
|
|
151 |
# returns False
|
|
152 |
calls.append(location_keys) |
|
153 |
result = [] |
|
154 |
for location_key in location_keys: |
|
155 |
if location_key[0] == end: |
|
156 |
result.append((location_key, False)) |
|
157 |
else: |
|
158 |
result.append((location_key, +1)) |
|
159 |
return result |
|
160 |
# given a 0 length file, this should terminate with one call.
|
|
161 |
end = 0 |
|
162 |
self.assertEqual([], |
|
163 |
list(bisect_multi_bytes(missing_last_content, 0, ['foo', 'bar']))) |
|
164 |
self.assertEqual([[(0, 'foo'), (0, 'bar')]], calls) |
|
165 |
del calls[:] |
|
166 |
end = 2 |
|
167 |
# given a 3 length file, this should make two calls - 1, 2.
|
|
168 |
self.assertEqual([], |
|
169 |
list(bisect_multi_bytes(missing_last_content, 3, ['foo', 'bar']))) |
|
170 |
self.assertEqual([ |
|
171 |
[(1, 'foo'), (1, 'bar')], |
|
172 |
[(2, 'foo'), (2, 'bar')], |
|
173 |
], calls) |
|
174 |
del calls[:] |
|
175 |
end = 268435456 - 2 |
|
176 |
# see the really-big lookup series in
|
|
177 |
# test_lookup_missing_key_before_all_others for details about this
|
|
178 |
# assertion.
|
|
179 |
self.assertEqual([], |
|
180 |
list(bisect_multi_bytes( |
|
181 |
missing_last_content,268435456 - 1 , ['foo', 'bar']))) |
|
182 |
self.assertEqual([ |
|
183 |
[(134217727, 'foo'), (134217727, 'bar')], |
|
184 |
[(201326590, 'foo'), (201326590, 'bar')], |
|
185 |
[(234881021, 'foo'), (234881021, 'bar')], |
|
186 |
[(251658236, 'foo'), (251658236, 'bar')], |
|
187 |
[(260046843, 'foo'), (260046843, 'bar')], |
|
188 |
[(264241146, 'foo'), (264241146, 'bar')], |
|
189 |
[(266338297, 'foo'), (266338297, 'bar')], |
|
190 |
[(267386872, 'foo'), (267386872, 'bar')], |
|
191 |
[(267911159, 'foo'), (267911159, 'bar')], |
|
192 |
[(268173302, 'foo'), (268173302, 'bar')], |
|
193 |
[(268304373, 'foo'), (268304373, 'bar')], |
|
194 |
[(268369908, 'foo'), (268369908, 'bar')], |
|
195 |
[(268402675, 'foo'), (268402675, 'bar')], |
|
196 |
[(268419058, 'foo'), (268419058, 'bar')], |
|
197 |
[(268427249, 'foo'), (268427249, 'bar')], |
|
198 |
[(268431344, 'foo'), (268431344, 'bar')], |
|
199 |
[(268433391, 'foo'), (268433391, 'bar')], |
|
200 |
[(268434414, 'foo'), (268434414, 'bar')], |
|
201 |
[(268434925, 'foo'), (268434925, 'bar')], |
|
202 |
[(268435180, 'foo'), (268435180, 'bar')], |
|
203 |
[(268435307, 'foo'), (268435307, 'bar')], |
|
204 |
[(268435370, 'foo'), (268435370, 'bar')], |
|
205 |
[(268435401, 'foo'), (268435401, 'bar')], |
|
206 |
[(268435416, 'foo'), (268435416, 'bar')], |
|
207 |
[(268435423, 'foo'), (268435423, 'bar')], |
|
208 |
[(268435426, 'foo'), (268435426, 'bar')], |
|
209 |
[(268435427, 'foo'), (268435427, 'bar')], |
|
210 |
[(268435428, 'foo'), (268435428, 'bar')], |
|
211 |
[(268435429, 'foo'), (268435429, 'bar')], |
|
212 |
[(268435430, 'foo'), (268435430, 'bar')], |
|
213 |
[(268435431, 'foo'), (268435431, 'bar')], |
|
214 |
[(268435432, 'foo'), (268435432, 'bar')], |
|
215 |
[(268435433, 'foo'), (268435433, 'bar')], |
|
216 |
[(268435434, 'foo'), (268435434, 'bar')], |
|
217 |
[(268435435, 'foo'), (268435435, 'bar')], |
|
218 |
[(268435436, 'foo'), (268435436, 'bar')], |
|
219 |
[(268435437, 'foo'), (268435437, 'bar')], |
|
220 |
[(268435438, 'foo'), (268435438, 'bar')], |
|
221 |
[(268435439, 'foo'), (268435439, 'bar')], |
|
222 |
[(268435440, 'foo'), (268435440, 'bar')], |
|
223 |
[(268435441, 'foo'), (268435441, 'bar')], |
|
224 |
[(268435442, 'foo'), (268435442, 'bar')], |
|
225 |
[(268435443, 'foo'), (268435443, 'bar')], |
|
226 |
[(268435444, 'foo'), (268435444, 'bar')], |
|
227 |
[(268435445, 'foo'), (268435445, 'bar')], |
|
228 |
[(268435446, 'foo'), (268435446, 'bar')], |
|
229 |
[(268435447, 'foo'), (268435447, 'bar')], |
|
230 |
[(268435448, 'foo'), (268435448, 'bar')], |
|
231 |
[(268435449, 'foo'), (268435449, 'bar')], |
|
232 |
[(268435450, 'foo'), (268435450, 'bar')], |
|
233 |
[(268435451, 'foo'), (268435451, 'bar')], |
|
234 |
[(268435452, 'foo'), (268435452, 'bar')], |
|
235 |
[(268435453, 'foo'), (268435453, 'bar')], |
|
236 |
[(268435454, 'foo'), (268435454, 'bar')] |
|
237 |
], calls) |
|
238 |
||
239 |
def test_lookup_when_a_key_is_missing_continues(self): |
|
240 |
calls = [] |
|
241 |
def missing_foo_otherwise_missing_first_content(location_keys): |
|
242 |
# returns -1 for all keys unless the byte offset is 0 when it
|
|
243 |
# returns False
|
|
244 |
calls.append(location_keys) |
|
245 |
result = [] |
|
246 |
for location_key in location_keys: |
|
247 |
if location_key[1] == 'foo' or location_key[0] == 0: |
|
248 |
result.append((location_key, False)) |
|
249 |
else: |
|
250 |
result.append((location_key, -1)) |
|
251 |
return result |
|
252 |
# given a 2 length file, this should terminate with two calls, one for
|
|
253 |
# both keys, and one for bar only.
|
|
254 |
self.assertEqual([], |
|
255 |
list(bisect_multi_bytes( |
|
256 |
missing_foo_otherwise_missing_first_content, 2, |
|
257 |
['foo', 'bar']))) |
|
258 |
self.assertEqual([ |
|
259 |
[(1, 'foo'), (1, 'bar')], |
|
260 |
[(0, 'bar')], |
|
261 |
], calls) |
|
262 |
||
263 |
def test_found_keys_returned_other_searches_continue(self): |
|
264 |
calls = [] |
|
265 |
def find_bar_at_1_foo_missing_at_0(location_keys): |
|
266 |
calls.append(location_keys) |
|
267 |
result = [] |
|
268 |
for location_key in location_keys: |
|
269 |
if location_key == (1, 'bar'): |
|
270 |
result.append((location_key, 'bar-result')) |
|
271 |
elif location_key[0] == 0: |
|
272 |
result.append((location_key, False)) |
|
273 |
else: |
|
274 |
result.append((location_key, -1)) |
|
275 |
return result |
|
276 |
# given a 4 length file, this should terminate with three calls, two for
|
|
277 |
# both keys, and one for foo only.
|
|
278 |
self.assertEqual([('bar', 'bar-result')], |
|
279 |
list(bisect_multi_bytes( |
|
280 |
find_bar_at_1_foo_missing_at_0, 4, |
|
281 |
['foo', 'bar']))) |
|
282 |
self.assertEqual([ |
|
283 |
[(2, 'foo'), (2, 'bar')], |
|
284 |
[(1, 'foo'), (1, 'bar')], |
|
285 |
[(0, 'foo')], |
|
286 |
], calls) |
|
287 |
||
288 |
def test_searches_different_keys_in_different_directions(self): |
|
289 |
calls = [] |
|
290 |
def missing_bar_at_1_foo_at_3(location_keys): |
|
291 |
calls.append(location_keys) |
|
292 |
result = [] |
|
293 |
for location_key in location_keys: |
|
294 |
if location_key[1] == 'bar': |
|
295 |
if location_key[0] == 1: |
|
296 |
result.append((location_key, False)) |
|
297 |
else: |
|
298 |
# search down
|
|
299 |
result.append((location_key, -1)) |
|
300 |
elif location_key[1] == 'foo': |
|
301 |
if location_key[0] == 3: |
|
302 |
result.append((location_key, False)) |
|
303 |
else: |
|
304 |
# search up
|
|
305 |
result.append((location_key, +1)) |
|
306 |
return result |
|
307 |
# given a 4 length file, this should terminate with two calls.
|
|
308 |
self.assertEqual([], |
|
309 |
list(bisect_multi_bytes( |
|
310 |
missing_bar_at_1_foo_at_3, 4, |
|
311 |
['foo', 'bar']))) |
|
312 |
self.assertEqual([ |
|
313 |
[(2, 'foo'), (2, 'bar')], |
|
314 |
[(3, 'foo'), (1, 'bar')], |
|
315 |
], calls) |
|
316 |
||
317 |
def test_change_direction_in_single_key_search(self): |
|
|
3943.8.1
by Marius Kruger
remove all trailing whitespace from bzr source |
318 |
# check that we can search down, up, down again -
|
|
2890.2.3
by Robert Collins
* New module ``bzrlib.bisect_multi`` with generic multiple-bisection-at-once |
319 |
# so length 8, goes 4, 6, 5
|
320 |
calls = [] |
|
321 |
def missing_at_5(location_keys): |
|
322 |
calls.append(location_keys) |
|
323 |
result = [] |
|
324 |
for location_key in location_keys: |
|
325 |
if location_key[0] == 5: |
|
326 |
result.append((location_key, False)) |
|
327 |
elif location_key[0] > 5: |
|
328 |
# search down
|
|
329 |
result.append((location_key, -1)) |
|
330 |
else: |
|
331 |
# search up
|
|
332 |
result.append((location_key, +1)) |
|
333 |
return result |
|
334 |
# given a 8 length file, this should terminate with three calls.
|
|
335 |
self.assertEqual([], |
|
336 |
list(bisect_multi_bytes( |
|
337 |
missing_at_5, 8, |
|
338 |
['foo', 'bar']))) |
|
339 |
self.assertEqual([ |
|
340 |
[(4, 'foo'), (4, 'bar')], |
|
341 |
[(6, 'foo'), (6, 'bar')], |
|
342 |
[(5, 'foo'), (5, 'bar')], |
|
343 |
], calls) |
|
344 |