2 * Copyright 2014 Facebook, Inc.
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
16 #include <gtest/gtest.h>
18 #include <folly/futures/Timekeeper.h>
21 using namespace folly;
22 using namespace std::chrono;
23 using folly::Timekeeper;
24 using Duration = folly::Duration;
26 std::chrono::milliseconds const one_ms(1);
27 std::chrono::milliseconds const awhile(10);
29 std::chrono::steady_clock::time_point now() {
30 return std::chrono::steady_clock::now();
33 struct TimekeeperFixture : public testing::Test {
35 timeLord_(folly::detail::getTimekeeperSingleton())
38 Timekeeper* timeLord_;
41 TEST_F(TimekeeperFixture, after) {
45 auto f = timeLord_->after(awhile);
46 EXPECT_FALSE(f.isReady());
50 EXPECT_GE(t2 - t1, awhile);
53 TEST(Timekeeper, futureGet) {
55 std::thread([&]{ p.setValue(42); }).detach();
56 EXPECT_EQ(42, p.getFuture().get());
59 TEST(Timekeeper, futureGetBeforeTimeout) {
61 auto t = std::thread([&]{ p.setValue(42); });
62 // Technically this is a race and if the test server is REALLY overloaded
63 // and it takes more than a second to do that thread it could be flaky. But
64 // I want a low timeout (in human terms) so if this regresses and someone
65 // runs it by hand they're not sitting there forever wondering why it's
66 // blocked, and get a useful error message instead. If it does get flaky,
67 // empirically increase the timeout to the point where it's very improbable.
68 EXPECT_EQ(42, p.getFuture().get(seconds(2)));
72 TEST(Timekeeper, futureGetTimeout) {
74 EXPECT_THROW(p.getFuture().get(Duration(1)), folly::TimedOut);
77 TEST(Timekeeper, futureSleep) {
79 futures::sleep(one_ms).get();
80 EXPECT_GE(now() - t1, one_ms);
83 TEST(Timekeeper, futureDelayed) {
85 auto dur = makeFuture()
87 .then([=]{ return now() - t1; })
90 EXPECT_GE(dur, one_ms);
93 TEST(Timekeeper, futureWithinThrows) {
95 auto f = p.getFuture()
97 .onError([](TimedOut&) { return -1; });
99 EXPECT_EQ(-1, f.get());
102 TEST(Timekeeper, futureWithinAlreadyComplete) {
103 auto f = makeFuture(42)
105 .onError([&](TimedOut&){ return -1; });
107 EXPECT_EQ(42, f.get());
110 TEST(Timekeeper, futureWithinFinishesInTime) {
112 auto f = p.getFuture()
113 .within(std::chrono::minutes(1))
114 .onError([&](TimedOut&){ return -1; });
117 EXPECT_EQ(42, f.get());
120 TEST(Timekeeper, futureWithinVoidSpecialization) {
121 makeFuture().within(one_ms);
124 TEST(Timekeeper, futureWithinException) {
126 auto f = p.getFuture().within(awhile, std::runtime_error("expected"));
127 EXPECT_THROW(f.get(), std::runtime_error);