1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
# Some simple Queue module tests, plus some failure conditions
# to ensure the Queue locks remain stable
import Queue
import sys
import threading
import time
from test.test_support import verify, TestFailed, verbose
queue_size = 5
# Execute a function that blocks, and in a seperate thread, a function that
# triggers the release. Returns the result of the blocking function.
class _TriggerThread(threading.Thread):
def __init__(self, fn, args):
self.fn = fn
self.args = args
self.startedEvent = threading.Event()
threading.Thread.__init__(self)
def run(self):
time.sleep(.1)
self.startedEvent.set()
self.fn(*self.args)
def _doBlockingTest( block_func, block_args, trigger_func, trigger_args):
t = _TriggerThread(trigger_func, trigger_args)
t.start()
try:
return block_func(*block_args)
finally:
# If we unblocked before our thread made the call, we failed!
if not t.startedEvent.isSet():
raise TestFailed("blocking function '%r' appeared not to block" % (block_func,))
t.join(1) # make sure the thread terminates
if t.isAlive():
raise TestFailed("trigger function '%r' appeared to not return" % (trigger_func,))
# A Queue subclass that can provoke failure at a moment's notice :)
class FailingQueueException(Exception):
pass
class FailingQueue(Queue.Queue):
def __init__(self, *args):
self.fail_next_put = False
self.fail_next_get = False
Queue.Queue.__init__(self, *args)
def _put(self, item):
if self.fail_next_put:
self.fail_next_put = False
raise FailingQueueException, "You Lose"
return Queue.Queue._put(self, item)
def _get(self):
if self.fail_next_get:
self.fail_next_get = False
raise FailingQueueException, "You Lose"
return Queue.Queue._get(self)
def FailingQueueTest(q):
if not q.empty():
raise RuntimeError, "Call this function with an empty queue"
for i in range(queue_size-1):
q.put(i)
q.fail_next_put = True
# Test a failing non-blocking put.
try:
q.put("oops", block=0)
raise TestFailed("The queue didn't fail when it should have")
except FailingQueueException:
pass
q.put("last")
verify(q.full(), "Queue should be full")
q.fail_next_put = True
# Test a failing blocking put
try:
_doBlockingTest( q.put, ("full",), q.get, ())
raise TestFailed("The queue didn't fail when it should have")
except FailingQueueException:
pass
# Check the Queue isn't damaged.
# put failed, but get succeeded - re-add
q.put("last")
verify(q.full(), "Queue should be full")
q.get()
verify(not q.full(), "Queue should not be full")
q.put("last")
verify(q.full(), "Queue should be full")
# Test a blocking put
_doBlockingTest( q.put, ("full",), q.get, ())
# Empty it
for i in range(queue_size):
q.get()
verify(q.empty(), "Queue should be empty")
q.put("first")
q.fail_next_get = True
try:
q.get()
raise TestFailed("The queue didn't fail when it should have")
except FailingQueueException:
pass
verify(not q.empty(), "Queue should not be empty")
q.get()
verify(q.empty(), "Queue should be empty")
q.fail_next_get = True
try:
_doBlockingTest( q.get, (), q.put, ('empty',))
raise TestFailed("The queue didn't fail when it should have")
except FailingQueueException:
pass
# put succeeded, but get failed.
verify(not q.empty(), "Queue should not be empty")
q.get()
verify(q.empty(), "Queue should be empty")
def SimpleQueueTest(q):
if not q.empty():
raise RuntimeError, "Call this function with an empty queue"
# I guess we better check things actually queue correctly a little :)
q.put(111)
q.put(222)
verify(q.get()==111 and q.get()==222, "Didn't seem to queue the correct data!")
for i in range(queue_size-1):
q.put(i)
verify(not q.full(), "Queue should not be full")
q.put("last")
verify(q.full(), "Queue should be full")
try:
q.put("full", block=0)
raise TestFailed("Didn't appear to block with a full queue")
except Queue.Full:
pass
# Test a blocking put
_doBlockingTest( q.put, ("full",), q.get, ())
# Empty it
for i in range(queue_size):
q.get()
verify(q.empty(), "Queue should be empty")
try:
q.get(block=0)
raise TestFailed("Didn't appear to block with an empty queue")
except Queue.Empty:
pass
# Test a blocking get
_doBlockingTest( q.get, (), q.put, ('empty',))
def test():
q=Queue.Queue(queue_size)
# Do it a couple of times on the same queue
SimpleQueueTest(q)
SimpleQueueTest(q)
if verbose:
print "Simple Queue tests seemed to work"
q = FailingQueue(queue_size)
FailingQueueTest(q)
FailingQueueTest(q)
if verbose:
print "Failing Queue tests seemed to work"
test()
|
