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
|
// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/testkit/test_kit.h>
#include <vespa/vespalib/data/smart_buffer.h>
using namespace vespalib;
void checkMemory(const vespalib::string &expect, const Memory &mem) {
EXPECT_EQUAL(expect, vespalib::string(mem.data, mem.size));
}
void checkBuffer(const vespalib::string &expect, SmartBuffer &buf) {
TEST_DO(checkMemory(expect, buf.obtain()));
}
void write_buf(const vespalib::string &str, SmartBuffer &buf) {
WritableMemory mem = buf.reserve(str.size());
for (size_t i = 0; i < str.size(); ++i) {
mem.data[i] = str.data()[i];
}
buf.commit(str.size());
}
TEST("require that basic read/write works") {
SmartBuffer buf(3);
TEST_DO(checkBuffer("", buf));
{ // read from empty buffer
EXPECT_TRUE(buf.empty());
EXPECT_EQUAL(0u, buf.obtain().size);
}
{ // write to buffer
WritableMemory mem = buf.reserve(10);
TEST_DO(checkBuffer("", buf));
EXPECT_LESS_EQUAL(10u, mem.size);
mem.data[0] = 'a';
mem.data[1] = 'b';
mem.data[2] = 'c';
EXPECT_EQUAL(&buf, &buf.commit(3));
EXPECT_FALSE(buf.empty());
mem = buf.reserve(0);
TEST_DO(checkBuffer("abc", buf));
EXPECT_LESS_EQUAL(0u, mem.size);
}
{ // read without evicting last byte
Memory mem = buf.obtain();
TEST_DO(checkBuffer("abc", buf));
TEST_DO(checkMemory("abc", mem));
EXPECT_EQUAL(&buf, &buf.evict(2));
mem = buf.obtain();
TEST_DO(checkBuffer("c", buf));
TEST_DO(checkMemory("c", mem));
mem = buf.obtain();
TEST_DO(checkBuffer("c", buf));
TEST_DO(checkMemory("c", mem));
}
{ // write more to buffer
WritableMemory mem = buf.reserve(10);
EXPECT_LESS_EQUAL(10u, mem.size);
TEST_DO(checkBuffer("c", buf));
mem.data[0] = 'd';
EXPECT_EQUAL(&buf, &buf.commit(1));
mem = buf.reserve(5);
TEST_DO(checkBuffer("cd", buf));
EXPECT_LESS_EQUAL(5u, mem.size);
}
{ // read until end
EXPECT_FALSE(buf.empty());
Memory mem = buf.obtain();
TEST_DO(checkBuffer("cd", buf));
TEST_DO(checkMemory("cd", mem));
EXPECT_EQUAL(&buf, &buf.evict(1));
mem = buf.obtain();
TEST_DO(checkBuffer("d", buf));
TEST_DO(checkMemory("d", mem));
EXPECT_EQUAL(&buf, &buf.evict(1));
EXPECT_TRUE(buf.empty());
mem = buf.obtain();
TEST_DO(checkBuffer("", buf));
TEST_DO(checkMemory("", mem));
}
}
TEST("require that requested initial size is not adjusted") {
SmartBuffer buf(400);
EXPECT_EQUAL(buf.capacity(), 400u);
}
TEST("require that buffer auto-resets when empty") {
SmartBuffer buf(64);
EXPECT_EQUAL(buf.reserve(10).size, 64u);
EXPECT_TRUE(buf.empty());
write_buf("abc", buf);
EXPECT_FALSE(buf.empty());
EXPECT_EQUAL(buf.reserve(10).size, 61u);
buf.evict(3);
EXPECT_TRUE(buf.empty());
EXPECT_EQUAL(buf.reserve(10).size, 64u);
}
TEST("require that buffer can grow") {
SmartBuffer buf(64);
EXPECT_EQUAL(buf.capacity(), 64u);
EXPECT_TRUE(buf.empty());
write_buf("abc", buf);
EXPECT_FALSE(buf.empty());
write_buf("abc", buf);
buf.evict(3);
EXPECT_EQUAL(buf.reserve(70).size, size_t(128 - 3));
TEST_DO(checkBuffer("abc", buf));
EXPECT_EQUAL(buf.capacity(), 128u);
}
TEST("require that buffer can grow more than 2x") {
SmartBuffer buf(64);
EXPECT_EQUAL(buf.capacity(), 64u);
EXPECT_TRUE(buf.empty());
write_buf("abc", buf);
EXPECT_FALSE(buf.empty());
write_buf("abc", buf);
buf.evict(3);
EXPECT_EQUAL(buf.reserve(170).size, 170u);
TEST_DO(checkBuffer("abc", buf));
EXPECT_EQUAL(buf.capacity(), 173u);
}
TEST("require that buffer can be compacted") {
SmartBuffer buf(16);
EXPECT_EQUAL(buf.capacity(), 16u);
EXPECT_TRUE(buf.empty());
write_buf("abc", buf);
EXPECT_FALSE(buf.empty());
write_buf("abc", buf);
buf.evict(3);
write_buf("abc", buf);
buf.evict(3);
write_buf("abc", buf);
buf.evict(3);
write_buf("abc", buf);
buf.evict(3);
EXPECT_EQUAL(buf.reserve(0).size, 1u);
write_buf("abc", buf);
TEST_DO(checkBuffer("abcabc", buf));
EXPECT_EQUAL(buf.capacity(), 16u);
EXPECT_EQUAL(buf.reserve(0).size, 10u);
}
TEST("require that a completely empty buffer can be created") {
SmartBuffer buf(0);
EXPECT_EQUAL(buf.capacity(), 0u);
EXPECT_TRUE(buf.empty());
EXPECT_TRUE(buf.obtain().data == nullptr);
}
TEST_MAIN() { TEST_RUN_ALL(); }
|
