1/*
2 * Copyright 2017-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/executors/ThreadedExecutor.h>
18
19#include <folly/Conv.h>
20#include <folly/futures/Future.h>
21#include <folly/gen/Base.h>
22#include <folly/portability/GTest.h>
23
24namespace {
25
26class ThreadedExecutorTest : public testing::Test {};
27} // namespace
28
29TEST_F(ThreadedExecutorTest, example) {
30 folly::ThreadedExecutor x;
31 auto ret = folly::via(&x)
32 .thenValue([&](auto&&) { return 42; })
33 .thenValue([&](int n) { return folly::to<std::string>(n); })
34 .get();
35
36 EXPECT_EQ("42", ret);
37}
38
39TEST_F(ThreadedExecutorTest, dtor_waits) {
40 constexpr auto kDelay = std::chrono::milliseconds(100);
41 auto x = std::make_unique<folly::ThreadedExecutor>();
42 auto fut = folly::via(&*x, [&] { /* sleep override */
43 std::this_thread::sleep_for(kDelay);
44 });
45 x = nullptr;
46
47 EXPECT_TRUE(fut.isReady());
48}
49
50TEST_F(ThreadedExecutorTest, many) {
51 constexpr auto kNumTasks = 1024;
52 folly::ThreadedExecutor x;
53 auto rets =
54 folly::collect(
55 folly::gen::range<size_t>(0, kNumTasks) |
56 folly::gen::map([&](size_t i) {
57 return folly::via(&x)
58 .thenValue([=](auto&&) { return i; })
59 .thenValue([](size_t k) { return folly::to<std::string>(k); });
60 }) |
61 folly::gen::as<std::vector>())
62 .get();
63
64 EXPECT_EQ("42", rets[42]);
65}
66
67TEST_F(ThreadedExecutorTest, many_sleeping_constant_time) {
68 constexpr auto kNumTasks = 256;
69 constexpr auto kDelay = std::chrono::milliseconds(100);
70 folly::ThreadedExecutor x;
71 auto rets =
72 folly::collect(
73 folly::gen::range<size_t>(0, kNumTasks) |
74 folly::gen::map([&](size_t i) {
75 return folly::via(&x)
76 .thenValue([=](auto&&) {
77 /* sleep override */ std::this_thread::sleep_for(kDelay);
78 })
79 .thenValue([=](auto&&) { return i; })
80 .thenValue([](size_t k) { return folly::to<std::string>(k); });
81 }) |
82 folly::gen::as<std::vector>())
83 .get();
84
85 EXPECT_EQ("42", rets[42]);
86}
87
88TEST_F(ThreadedExecutorTest, many_sleeping_decreasing_time) {
89 constexpr auto kNumTasks = 256;
90 constexpr auto kDelay = std::chrono::milliseconds(100);
91 folly::ThreadedExecutor x;
92 auto rets =
93 folly::collect(
94 folly::gen::range<size_t>(0, kNumTasks) |
95 folly::gen::map([&](size_t i) {
96 return folly::via(&x)
97 .thenValue([=](auto&&) {
98 auto delay = kDelay * (kNumTasks - i) / kNumTasks;
99 /* sleep override */ std::this_thread::sleep_for(delay);
100 })
101 .thenValue([=](auto&&) { return i; })
102 .thenValue([](size_t k) { return folly::to<std::string>(k); });
103 }) |
104 folly::gen::as<std::vector>())
105 .get();
106
107 EXPECT_EQ("42", rets[42]);
108}
109