~bzr-pqm/bzr/bzr.dev

« back to all changes in this revision

Viewing changes to bzrlib/tests/test_cethread.py

  • Committer: Vincent Ladeuil
  • Date: 2011-12-21 14:25:26 UTC
  • mto: This revision was merged to the branch mainline in revision 6397.
  • Revision ID: v.ladeuil+lp@free.fr-20111221142526-pnwau0xnalimujts
Provides MemoryStack to simplify configuration setup in tests

Show diffs side-by-side

added added

removed removed

Lines of Context:
 
1
# Copyright (C) 2010, 2011 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 
16
 
 
17
import threading
 
18
 
 
19
from bzrlib import (
 
20
    cethread,
 
21
    tests,
 
22
    )
 
23
 
 
24
 
 
25
class TestCatchingExceptionThread(tests.TestCase):
 
26
 
 
27
    def test_start_and_join_smoke_test(self):
 
28
        def do_nothing():
 
29
            pass
 
30
 
 
31
        tt = cethread.CatchingExceptionThread(target=do_nothing)
 
32
        tt.start()
 
33
        tt.join()
 
34
 
 
35
    def test_exception_is_re_raised(self):
 
36
        class MyException(Exception):
 
37
            pass
 
38
 
 
39
        def raise_my_exception():
 
40
            raise MyException()
 
41
 
 
42
        tt = cethread.CatchingExceptionThread(target=raise_my_exception)
 
43
        tt.start()
 
44
        self.assertRaises(MyException, tt.join)
 
45
 
 
46
    def test_join_around_exception(self):
 
47
        resume = threading.Event()
 
48
        class MyException(Exception):
 
49
            pass
 
50
 
 
51
        def raise_my_exception():
 
52
            # Wait for the test to tell us to resume
 
53
            resume.wait()
 
54
            # Now we can raise
 
55
            raise MyException()
 
56
 
 
57
        tt = cethread.CatchingExceptionThread(target=raise_my_exception)
 
58
        tt.start()
 
59
        tt.join(timeout=0)
 
60
        self.assertIs(None, tt.exception)
 
61
        resume.set()
 
62
        self.assertRaises(MyException, tt.join)
 
63
 
 
64
    def test_sync_event(self):
 
65
        control = threading.Event()
 
66
        in_thread = threading.Event()
 
67
        class MyException(Exception):
 
68
            pass
 
69
 
 
70
        def raise_my_exception():
 
71
            # Wait for the test to tell us to resume
 
72
            control.wait()
 
73
            # Now we can raise
 
74
            raise MyException()
 
75
 
 
76
        tt = cethread.CatchingExceptionThread(target=raise_my_exception,
 
77
                                            sync_event=in_thread)
 
78
        tt.start()
 
79
        tt.join(timeout=0)
 
80
        self.assertIs(None, tt.exception)
 
81
        self.assertIs(in_thread, tt.sync_event)
 
82
        control.set()
 
83
        self.assertRaises(MyException, tt.join)
 
84
        self.assertEquals(True, tt.sync_event.isSet())
 
85
 
 
86
    def test_switch_and_set(self):
 
87
        """Caller can precisely control a thread."""
 
88
        control1 = threading.Event()
 
89
        control2 = threading.Event()
 
90
        control3 = threading.Event()
 
91
 
 
92
        class TestThread(cethread.CatchingExceptionThread):
 
93
 
 
94
            def __init__(self):
 
95
                super(TestThread, self).__init__(target=self.step_by_step)
 
96
                self.current_step = 'starting'
 
97
                self.step1 = threading.Event()
 
98
                self.set_sync_event(self.step1)
 
99
                self.step2 = threading.Event()
 
100
                self.final = threading.Event()
 
101
 
 
102
            def step_by_step(self):
 
103
                control1.wait()
 
104
                self.current_step = 'step1'
 
105
                self.switch_and_set(self.step2)
 
106
                control2.wait()
 
107
                self.current_step = 'step2'
 
108
                self.switch_and_set(self.final)
 
109
                control3.wait()
 
110
                self.current_step = 'done'
 
111
 
 
112
        tt = TestThread()
 
113
        tt.start()
 
114
        self.assertEquals('starting', tt.current_step)
 
115
        control1.set()
 
116
        tt.step1.wait()
 
117
        self.assertEquals('step1', tt.current_step)
 
118
        control2.set()
 
119
        tt.step2.wait()
 
120
        self.assertEquals('step2', tt.current_step)
 
121
        control3.set()
 
122
        # We don't wait on tt.final
 
123
        tt.join()
 
124
        self.assertEquals('done', tt.current_step)
 
125
 
 
126
    def test_exception_while_switch_and_set(self):
 
127
        control1 = threading.Event()
 
128
 
 
129
        class MyException(Exception):
 
130
            pass
 
131
 
 
132
        class TestThread(cethread.CatchingExceptionThread):
 
133
 
 
134
            def __init__(self, *args, **kwargs):
 
135
                self.step1 = threading.Event()
 
136
                self.step2 = threading.Event()
 
137
                super(TestThread, self).__init__(target=self.step_by_step,
 
138
                                                 sync_event=self.step1)
 
139
                self.current_step = 'starting'
 
140
                self.set_sync_event(self.step1)
 
141
 
 
142
            def step_by_step(self):
 
143
                control1.wait()
 
144
                self.current_step = 'step1'
 
145
                self.switch_and_set(self.step2)
 
146
 
 
147
            def set_sync_event(self, event):
 
148
                # We force an exception while trying to set step2
 
149
                if event is self.step2:
 
150
                    raise MyException()
 
151
                super(TestThread, self).set_sync_event(event)
 
152
 
 
153
        tt = TestThread()
 
154
        tt.start()
 
155
        self.assertEquals('starting', tt.current_step)
 
156
        control1.set()
 
157
        # We now wait on step1 which will be set when catching the exception
 
158
        tt.step1.wait()
 
159
        self.assertRaises(MyException, tt.pending_exception)
 
160
        self.assertIs(tt.step1, tt.sync_event)
 
161
        self.assertTrue(tt.step1.isSet())