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
|
require 'abstract_unit'
require 'fixtures/person'
require 'fixtures/legacy_thing'
class OptimisticLockingTest < Test::Unit::TestCase
fixtures :people, :legacy_things
def test_lock_existing
p1 = Person.find(1)
p2 = Person.find(1)
assert_equal 0, p1.lock_version
assert_equal 0, p2.lock_version
p1.save!
assert_equal 1, p1.lock_version
assert_equal 0, p2.lock_version
assert_raises(ActiveRecord::StaleObjectError) { p2.save! }
end
def test_lock_new
p1 = Person.new(:first_name => 'anika')
assert_equal 0, p1.lock_version
p1.save!
p2 = Person.find(p1.id)
assert_equal 0, p1.lock_version
assert_equal 0, p2.lock_version
p1.save!
assert_equal 1, p1.lock_version
assert_equal 0, p2.lock_version
assert_raises(ActiveRecord::StaleObjectError) { p2.save! }
end
def test_lock_column_name_existing
t1 = LegacyThing.find(1)
t2 = LegacyThing.find(1)
assert_equal 0, t1.version
assert_equal 0, t2.version
t1.save!
assert_equal 1, t1.version
assert_equal 0, t2.version
assert_raises(ActiveRecord::StaleObjectError) { t2.save! }
end
def test_lock_column_is_mass_assignable
p1 = Person.create(:first_name => 'bianca')
assert_equal 0, p1.lock_version
assert_equal p1.lock_version, Person.new(p1.attributes).lock_version
p1.save!
assert_equal 1, p1.lock_version
assert_equal p1.lock_version, Person.new(p1.attributes).lock_version
end
end
# TODO: test against the generated SQL since testing locking behavior itself
# is so cumbersome. Will deadlock Ruby threads if the underlying db.execute
# blocks, so separate script called by Kernel#system is needed.
# (See exec vs. async_exec in the PostgreSQL adapter.)
class PessimisticLockingTest < Test::Unit::TestCase
self.use_transactional_fixtures = false
fixtures :people
def setup
@allow_concurrency = ActiveRecord::Base.allow_concurrency
ActiveRecord::Base.allow_concurrency = true
end
def teardown
ActiveRecord::Base.allow_concurrency = @allow_concurrency
end
# Test that the adapter doesn't blow up on add_lock!
def test_sane_find_with_lock
assert_nothing_raised do
Person.transaction do
Person.find 1, :lock => true
end
end
end
# Test no-blowup for scoped lock.
def test_sane_find_with_lock
assert_nothing_raised do
Person.transaction do
Person.with_scope(:find => { :lock => true }) do
Person.find 1
end
end
end
end
# Locking a record reloads it.
def test_sane_lock_method
assert_nothing_raised do
Person.transaction do
person = Person.find 1
old, person.first_name = person.first_name, 'fooman'
person.lock!
assert_equal old, person.first_name
end
end
end
if current_adapter?(:PostgreSQLAdapter, :OracleAdapter)
def test_no_locks_no_wait
first, second = duel { Person.find 1 }
assert first.end > second.end
end
def test_second_lock_waits
first, second = duel { Person.find 1, :lock => true }
assert second.end > first.end
end
protected
def duel(zzz = 1.0)
t0, t1, t2, t3 = nil, nil, nil, nil
a = Thread.new do
t0 = Time.now
Person.transaction do
yield
sleep zzz # block thread 2 for zzz seconds
end
t1 = Time.now
end
b = Thread.new do
sleep zzz / 2.0 # ensure thread 1 tx starts first
t2 = Time.now
Person.transaction { yield }
t3 = Time.now
end
a.join
b.join
assert t1 > t0 + zzz
assert t2 > t0
assert t3 > t2
[t0.to_f..t1.to_f, t2.to_f..t3.to_f]
end
end
end
|
