forked from ruby-concurrency/concurrent-ruby
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathtvar_spec.rb
More file actions
176 lines (131 loc) · 3.41 KB
/
Copy pathtvar_spec.rb
File metadata and controls
176 lines (131 loc) · 3.41 KB
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
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
require 'concurrent/tvar'
module Concurrent
RSpec.describe TVar do
context '#initialize' do
it 'accepts an initial value' do
t = TVar.new(14)
expect(t.value).to eq 14
end
end
context '#value' do
it 'gets the value' do
t = TVar.new(14)
expect(t.value).to eq 14
end
end
context '#value=' do
it 'sets the value' do
t = TVar.new(14)
t.value = 2
expect(t.value).to eq 2
end
end
end
RSpec.describe '#atomically' do
it 'raises an exception when no block given' do
expect { Concurrent::atomically }.to raise_error(ArgumentError)
end
it 'raises the same exception that was raised in Concurrent::atomically' do
expect {
Concurrent::atomically do
raise StandardError, 'This is an error!'
end
}.to raise_error(StandardError, 'This is an error!')
end
it 'retries on abort' do
count = 0
Concurrent::atomically do
if count == 0
count = 1
Concurrent::abort_transaction
else
count = 2
end
end
expect(count).to eq 2
end
it 'commits writes if the transaction succeeds' do
t = TVar.new(0)
Concurrent::atomically do
t.value = 1
end
expect(t.value).to eq 1
end
it 'undoes writes if the transaction is aborted' do
t = TVar.new(0)
count = 0
Concurrent::atomically do
if count == 0
t.value = 1
count = 1
Concurrent::abort_transaction
end
end
expect(t.value).to eq 0
end
it 'provides atomicity' do
t1 = TVar.new(0)
t2 = TVar.new(0)
count = 0
Concurrent::atomically do
if count == 0
count = 1
t1.value = 1
Concurrent::abort_transaction
t2.value = 2
end
end
expect(t1.value).to eq 0
expect(t2.value).to eq 0
end
it 'nests' do
t = TVar.new(0)
Concurrent::atomically do
expect(t.value).to eq 0
t.value = 1
Concurrent::atomically do
expect(t.value).to eq 1
t.value = 2
Concurrent::atomically do
expect(t.value).to eq 2
t.value = 3
end
expect(t.value).to eq 3
t.value = 4
end
expect(t.value).to eq 4
t.value = 5
end
expect(t.value).to eq 5
end
it 'reflects transactional writes from within the same transaction' do
t = TVar.new(0)
Concurrent::atomically do
expect(t.value).to eq 0
t.value = 14
expect(t.value).to eq 14
t.value = 2
expect(t.value).to eq 2
end
end
end
RSpec.describe '#abort_transaction' do
it 'raises an exception outside an #atomically block' do
expect { Concurrent::abort_transaction }.to raise_error(Concurrent::Transaction::AbortError)
end
end
RSpec.describe '#leave_transaction' do
it 'raises an exception outside an #atomically block' do
expect { Concurrent::leave_transaction }.to raise_error(Concurrent::Transaction::LeaveError)
end
it 'neither commits nor aborts a transaction' do
t = TVar.new(0)
Concurrent::atomically do
expect(t.value).to eq 0
t.value = 14
Concurrent::leave_transaction
end
expect(t.value).to eq 0
end
end
end