1 /*
2 * Copyright (c) Facebook, Inc. and its affiliates.
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 <stdexcept>
20
21 #include <folly/Conv.h>
22 #include <folly/futures/Future.h>
23 #include <folly/gen/Base.h>
24 #include <folly/portability/GTest.h>
25
26 namespace {
27
28 class ThreadedExecutorTest : public testing::Test {};
29 } // namespace
30
TEST_F(ThreadedExecutorTest,example)31 TEST_F(ThreadedExecutorTest, example) {
32 folly::ThreadedExecutor x;
33 auto ret = folly::via(&x)
34 .thenValue([&](auto&&) { return 42; })
35 .thenValue([&](int n) { return folly::to<std::string>(n); })
36 .get();
37
38 EXPECT_EQ("42", ret);
39 }
40
TEST_F(ThreadedExecutorTest,exception)41 TEST_F(ThreadedExecutorTest, exception) {
42 folly::ThreadedExecutor x;
43 x.add([] { throw std::runtime_error("This should not crash the program"); });
44 }
45
TEST_F(ThreadedExecutorTest,dtor_waits)46 TEST_F(ThreadedExecutorTest, dtor_waits) {
47 constexpr auto kDelay = std::chrono::milliseconds(100);
48 auto x = std::make_unique<folly::ThreadedExecutor>();
49 auto fut = folly::via(&*x, [&] { /* sleep override */
50 std::this_thread::sleep_for(kDelay);
51 });
52 x = nullptr;
53
54 EXPECT_TRUE(fut.isReady());
55 }
56
TEST_F(ThreadedExecutorTest,many)57 TEST_F(ThreadedExecutorTest, many) {
58 constexpr auto kNumTasks = 1024;
59 folly::ThreadedExecutor x;
60 auto rets =
61 folly::collect(
62 folly::gen::range<size_t>(0, kNumTasks) |
63 folly::gen::map([&](size_t i) {
64 return folly::via(&x)
65 .thenValue([=](auto&&) { return i; })
66 .thenValue([](size_t k) { return folly::to<std::string>(k); });
67 }) |
68 folly::gen::as<std::vector>())
69 .get();
70
71 EXPECT_EQ("42", rets[42]);
72 }
73
TEST_F(ThreadedExecutorTest,many_sleeping_constant_time)74 TEST_F(ThreadedExecutorTest, many_sleeping_constant_time) {
75 constexpr auto kNumTasks = 256;
76 constexpr auto kDelay = std::chrono::milliseconds(100);
77 folly::ThreadedExecutor x;
78 auto rets =
79 folly::collect(
80 folly::gen::range<size_t>(0, kNumTasks) |
81 folly::gen::map([&](size_t i) {
82 return folly::via(&x)
83 .thenValue([=](auto&&) {
84 /* sleep override */ std::this_thread::sleep_for(kDelay);
85 })
86 .thenValue([=](auto&&) { return i; })
87 .thenValue([](size_t k) { return folly::to<std::string>(k); });
88 }) |
89 folly::gen::as<std::vector>())
90 .get();
91
92 EXPECT_EQ("42", rets[42]);
93 }
94
TEST_F(ThreadedExecutorTest,many_sleeping_decreasing_time)95 TEST_F(ThreadedExecutorTest, many_sleeping_decreasing_time) {
96 constexpr auto kNumTasks = 256;
97 constexpr auto kDelay = std::chrono::milliseconds(100);
98 folly::ThreadedExecutor x;
99 auto rets =
100 folly::collect(
101 folly::gen::range<size_t>(0, kNumTasks) |
102 folly::gen::map([&](size_t i) {
103 return folly::via(&x)
104 .thenValue([=](auto&&) {
105 auto delay = kDelay * (kNumTasks - i) / kNumTasks;
106 /* sleep override */ std::this_thread::sleep_for(delay);
107 })
108 .thenValue([=](auto&&) { return i; })
109 .thenValue([](size_t k) { return folly::to<std::string>(k); });
110 }) |
111 folly::gen::as<std::vector>())
112 .get();
113
114 EXPECT_EQ("42", rets[42]);
115 }
116