1/*
2 * Copyright 2018-present Facebook, Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <folly/stats/detail/DigestBuilder-defs.h>
18
19#include <chrono>
20#include <random>
21#include <thread>
22
23#include <folly/Range.h>
24#include <folly/portability/GTest.h>
25
26using namespace folly;
27using namespace folly::detail;
28
29template <size_t MergeSize>
30class SimpleDigest {
31 public:
32 explicit SimpleDigest(size_t sz) : sz_(sz) {}
33
34 SimpleDigest merge(Range<const double*> r) const {
35 EXPECT_EQ(MergeSize, r.size());
36 for (size_t i = 0; i < MergeSize; ++i) {
37 EXPECT_GE(MergeSize, r[i]);
38 }
39 return *this;
40 }
41
42 static SimpleDigest merge(Range<const SimpleDigest*> r) {
43 EXPECT_EQ(1, r.size());
44 return *r.begin();
45 }
46
47 int64_t getSize() const {
48 return sz_;
49 }
50
51 private:
52 int64_t sz_;
53};
54
55TEST(DigestBuilder, SingleThreadUnfilledBuffer) {
56 DigestBuilder<SimpleDigest<999>> builder(1000, 100);
57 for (int i = 0; i < 999; ++i) {
58 builder.append(i);
59 }
60 EXPECT_EQ(100, builder.build().getSize());
61}
62
63TEST(DigestBuilder, SingleThreadFilledBuffer) {
64 DigestBuilder<SimpleDigest<1000>> builder(1000, 100);
65 for (int i = 0; i < 1000; ++i) {
66 builder.append(i);
67 }
68 EXPECT_EQ(100, builder.build().getSize());
69}
70
71TEST(DigestBuilder, MultipleThreads) {
72 DigestBuilder<SimpleDigest<1000>> builder(1000, 100);
73 std::vector<std::thread> threads;
74 for (int i = 0; i < 10; ++i) {
75 threads.push_back(std::thread([i, &builder]() {
76 for (int j = 0; j < 100; ++j) {
77 builder.append(i * 100 + j);
78 }
79 }));
80 }
81 for (auto& thread : threads) {
82 thread.join();
83 }
84
85 EXPECT_EQ(100, builder.build().getSize());
86}
87