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.
19 #include <folly/small_vector.h>
20 #include <gtest/gtest.h>
24 #include <type_traits>
26 #include "folly/wangle/Executor.h"
27 #include "folly/wangle/Future.h"
29 using namespace folly::wangle;
32 using std::unique_ptr;
35 #define EXPECT_TYPE(x, T) \
36 EXPECT_TRUE((std::is_same<decltype(x), T>::value))
38 typedef WangleException eggs_t;
39 static eggs_t eggs("eggs");
56 Try<A> t_a(std::move(a));
60 EXPECT_EQ(5, t_a.value().x());
63 TEST(Future, special) {
64 EXPECT_FALSE(std::is_copy_constructible<Future<int>>::value);
65 EXPECT_FALSE(std::is_copy_assignable<Future<int>>::value);
66 EXPECT_TRUE(std::is_move_constructible<Future<int>>::value);
67 EXPECT_TRUE(std::is_move_assignable<Future<int>>::value);
73 makeFuture<int>(42).then([&](Try<int>&& t) {
75 EXPECT_EQ(42, t.value());
77 EXPECT_TRUE(flag); flag = false;
80 .then([](Try<int>&& t) { return t.value(); })
81 .then([&](Try<int>&& t) { flag = true; EXPECT_EQ(42, t.value()); });
82 EXPECT_TRUE(flag); flag = false;
84 makeFuture().then([&](Try<void>&& t) { flag = true; t.value(); });
85 EXPECT_TRUE(flag); flag = false;
88 auto f = p.getFuture().then([&](Try<void>&& t) { flag = true; });
90 EXPECT_FALSE(f.isReady());
93 EXPECT_TRUE(f.isReady());
96 static string doWorkStatic(Try<string>&& t) {
97 return t.value() + ";static";
100 TEST(Future, thenFunction) {
102 string doWork(Try<string>&& t) {
103 return t.value() + ";class";
105 static string doWorkStatic(Try<string>&& t) {
106 return t.value() + ";class-static";
110 auto f = makeFuture<string>("start")
112 .then(Worker::doWorkStatic)
113 .then(&w, &Worker::doWork);
115 EXPECT_EQ(f.value(), "start;static;class-static;class");
118 static Future<string> doWorkStaticFuture(Try<string>&& t) {
119 return makeFuture(t.value() + ";static");
122 TEST(Future, thenFunctionFuture) {
124 Future<string> doWorkFuture(Try<string>&& t) {
125 return makeFuture(t.value() + ";class");
127 static Future<string> doWorkStaticFuture(Try<string>&& t) {
128 return makeFuture(t.value() + ";class-static");
132 auto f = makeFuture<string>("start")
133 .then(doWorkStaticFuture)
134 .then(Worker::doWorkStaticFuture)
135 .then(&w, &Worker::doWorkFuture);
137 EXPECT_EQ(f.value(), "start;static;class-static;class");
140 TEST(Future, value) {
141 auto f = makeFuture(unique_ptr<int>(new int(42)));
142 auto up = std::move(f.value());
145 EXPECT_THROW(makeFuture<int>(eggs).value(), eggs_t);
148 TEST(Future, isReady) {
150 auto f = p.getFuture();
151 EXPECT_FALSE(f.isReady());
153 EXPECT_TRUE(f.isReady());
156 TEST(Future, hasException) {
157 EXPECT_TRUE(makeFuture<int>(eggs).getTry().hasException());
158 EXPECT_FALSE(makeFuture(42).getTry().hasException());
161 TEST(Future, hasValue) {
162 EXPECT_TRUE(makeFuture(42).getTry().hasValue());
163 EXPECT_FALSE(makeFuture<int>(eggs).getTry().hasValue());
166 TEST(Future, makeFuture) {
167 EXPECT_TYPE(makeFuture(42), Future<int>);
168 EXPECT_EQ(42, makeFuture(42).value());
170 EXPECT_TYPE(makeFuture<float>(42), Future<float>);
171 EXPECT_EQ(42, makeFuture<float>(42).value());
173 auto fun = [] { return 42; };
174 EXPECT_TYPE(makeFutureTry(fun), Future<int>);
175 EXPECT_EQ(42, makeFutureTry(fun).value());
177 auto failfun = []() -> int { throw eggs; };
178 EXPECT_TYPE(makeFutureTry(failfun), Future<int>);
179 EXPECT_THROW(makeFutureTry(failfun).value(), eggs_t);
181 EXPECT_TYPE(makeFuture(), Future<void>);
186 TEST(Promise, special) {
187 EXPECT_FALSE(std::is_copy_constructible<Promise<int>>::value);
188 EXPECT_FALSE(std::is_copy_assignable<Promise<int>>::value);
189 EXPECT_TRUE(std::is_move_constructible<Promise<int>>::value);
190 EXPECT_TRUE(std::is_move_assignable<Promise<int>>::value);
193 TEST(Promise, getFuture) {
195 Future<int> f = p.getFuture();
196 EXPECT_FALSE(f.isReady());
199 TEST(Promise, setValue) {
201 auto ffund = fund.getFuture();
203 EXPECT_EQ(42, ffund.value());
211 auto fpod = pod.getFuture();
212 Foo f = {"the answer", 42};
214 Foo f2 = fpod.value();
215 EXPECT_EQ(f.name, f2.name);
216 EXPECT_EQ(f.value, f2.value);
218 pod = Promise<Foo>();
219 fpod = pod.getFuture();
220 pod.setValue(std::move(f2));
221 Foo f3 = fpod.value();
222 EXPECT_EQ(f.name, f3.name);
223 EXPECT_EQ(f.value, f3.value);
225 Promise<unique_ptr<int>> mov;
226 auto fmov = mov.getFuture();
227 mov.setValue(unique_ptr<int>(new int(42)));
228 unique_ptr<int> ptr = std::move(fmov.value());
232 auto fv = v.getFuture();
234 EXPECT_TRUE(fv.isReady());
237 TEST(Promise, setException) {
240 auto f = p.getFuture();
241 p.setException(eggs);
242 EXPECT_THROW(f.value(), eggs_t);
246 auto f = p.getFuture();
250 p.setException(std::current_exception());
252 EXPECT_THROW(f.value(), eggs_t);
256 TEST(Promise, fulfil) {
259 auto f = p.getFuture();
260 p.fulfil([] { return 42; });
261 EXPECT_EQ(42, f.value());
265 auto f = p.getFuture();
266 p.fulfil([]() -> int { throw eggs; });
267 EXPECT_THROW(f.value(), eggs_t);
271 TEST(Future, finish) {
272 auto x = std::make_shared<int>(0);
274 auto f = p.getFuture().then([x](Try<int>&& t) { *x = t.value(); });
276 // The continuation hasn't executed
279 // The continuation has a reference to x
280 EXPECT_EQ(2, x.use_count());
284 // the continuation has executed
287 // the continuation has been destructed
288 // and has released its reference to x
289 EXPECT_EQ(1, x.use_count());
292 TEST(Future, unwrap) {
296 auto fa = a.getFuture();
297 auto fb = b.getFuture();
302 // do a, then do b, and get the result of a + b.
303 Future<int> f = fa.then([&](Try<int>&& ta) {
304 auto va = ta.value();
306 return fb.then([va, &flag2](Try<int>&& tb) {
308 return va + tb.value();
314 EXPECT_FALSE(f.isReady());
319 EXPECT_FALSE(f.isReady());
324 EXPECT_EQ(7, f.value());
327 TEST(Future, whenAll) {
328 // returns a vector variant
330 vector<Promise<int>> promises(10);
331 vector<Future<int>> futures;
333 for (auto& p : promises)
334 futures.push_back(p.getFuture());
336 auto allf = whenAll(futures.begin(), futures.end());
338 random_shuffle(promises.begin(), promises.end());
339 for (auto& p : promises) {
340 EXPECT_FALSE(allf.isReady());
344 EXPECT_TRUE(allf.isReady());
345 auto& results = allf.value();
346 for (auto& t : results) {
347 EXPECT_EQ(42, t.value());
351 // check error semantics
353 vector<Promise<int>> promises(4);
354 vector<Future<int>> futures;
356 for (auto& p : promises)
357 futures.push_back(p.getFuture());
359 auto allf = whenAll(futures.begin(), futures.end());
362 promises[0].setValue(42);
363 promises[1].setException(eggs);
365 EXPECT_FALSE(allf.isReady());
367 promises[2].setValue(42);
369 EXPECT_FALSE(allf.isReady());
371 promises[3].setException(eggs);
373 EXPECT_TRUE(allf.isReady());
374 EXPECT_FALSE(allf.getTry().hasException());
376 auto& results = allf.value();
377 EXPECT_EQ(42, results[0].value());
378 EXPECT_TRUE(results[1].hasException());
379 EXPECT_EQ(42, results[2].value());
380 EXPECT_TRUE(results[3].hasException());
383 // check that futures are ready in then()
385 vector<Promise<void>> promises(10);
386 vector<Future<void>> futures;
388 for (auto& p : promises)
389 futures.push_back(p.getFuture());
391 auto allf = whenAll(futures.begin(), futures.end())
392 .then([](Try<vector<Try<void>>>&& ts) {
393 for (auto& f : ts.value())
397 random_shuffle(promises.begin(), promises.end());
398 for (auto& p : promises)
400 EXPECT_TRUE(allf.isReady());
405 TEST(Future, whenAny) {
407 vector<Promise<int>> promises(10);
408 vector<Future<int>> futures;
410 for (auto& p : promises)
411 futures.push_back(p.getFuture());
413 for (auto& f : futures) {
414 EXPECT_FALSE(f.isReady());
417 auto anyf = whenAny(futures.begin(), futures.end());
419 /* futures were moved in, so these are invalid now */
420 EXPECT_FALSE(anyf.isReady());
422 promises[7].setValue(42);
423 EXPECT_TRUE(anyf.isReady());
424 auto& idx_fut = anyf.value();
426 auto i = idx_fut.first;
429 auto& f = idx_fut.second;
430 EXPECT_EQ(42, f.value());
435 vector<Promise<void>> promises(10);
436 vector<Future<void>> futures;
438 for (auto& p : promises)
439 futures.push_back(p.getFuture());
441 for (auto& f : futures) {
442 EXPECT_FALSE(f.isReady());
445 auto anyf = whenAny(futures.begin(), futures.end());
447 EXPECT_FALSE(anyf.isReady());
449 promises[3].setException(eggs);
450 EXPECT_TRUE(anyf.isReady());
451 EXPECT_TRUE(anyf.value().second.hasException());
456 vector<Promise<int>> promises(10);
457 vector<Future<int>> futures;
459 for (auto& p : promises)
460 futures.push_back(p.getFuture());
462 auto anyf = whenAny(futures.begin(), futures.end())
463 .then([](Try<pair<size_t, Try<int>>>&& f) {
464 EXPECT_EQ(42, f.value().second.value());
467 promises[3].setValue(42);
468 EXPECT_TRUE(anyf.isReady());
473 TEST(when, already_completed) {
475 vector<Future<void>> fs;
476 for (int i = 0; i < 10; i++)
477 fs.push_back(makeFuture());
479 whenAll(fs.begin(), fs.end())
480 .then([&](Try<vector<Try<void>>>&& t) {
481 EXPECT_EQ(fs.size(), t.value().size());
485 vector<Future<int>> fs;
486 for (int i = 0; i < 10; i++)
487 fs.push_back(makeFuture(i));
489 whenAny(fs.begin(), fs.end())
490 .then([&](Try<pair<size_t, Try<int>>>&& t) {
492 EXPECT_EQ(p.first, p.second.value());
498 vector<Promise<void>> promises(10);
499 vector<Future<void>> futures;
501 for (auto& p : promises)
502 futures.push_back(p.getFuture());
506 whenN(futures.begin(), futures.end(), n)
507 .then([&](Try<vector<pair<size_t, Try<void>>>>&& t) {
510 EXPECT_EQ(n, v.size());
512 EXPECT_TRUE(tt.second.hasValue());
515 promises[0].setValue();
517 promises[1].setValue();
519 promises[2].setValue();
523 /* Ensure that we can compile when_{all,any} with folly::small_vector */
524 TEST(when, small_vector) {
526 static_assert(!FOLLY_IS_TRIVIALLY_COPYABLE(Future<void>),
527 "Futures should not be trivially copyable");
528 static_assert(!FOLLY_IS_TRIVIALLY_COPYABLE(Future<int>),
529 "Futures should not be trivially copyable");
531 using folly::small_vector;
533 small_vector<Future<void>> futures;
535 for (int i = 0; i < 10; i++)
536 futures.push_back(makeFuture());
538 auto anyf = whenAny(futures.begin(), futures.end());
542 small_vector<Future<void>> futures;
544 for (int i = 0; i < 10; i++)
545 futures.push_back(makeFuture());
547 auto allf = whenAll(futures.begin(), futures.end());
551 TEST(Future, whenAllVariadic) {
554 Future<bool> fb = pb.getFuture();
555 Future<int> fi = pi.getFuture();
557 whenAll(std::move(fb), std::move(fi))
558 .then([&](Try<std::tuple<Try<bool>, Try<int>>>&& t) {
560 EXPECT_TRUE(t.hasValue());
561 EXPECT_TRUE(std::get<0>(t.value()).hasValue());
562 EXPECT_EQ(std::get<0>(t.value()).value(), true);
563 EXPECT_TRUE(std::get<1>(t.value()).hasValue());
564 EXPECT_EQ(std::get<1>(t.value()).value(), 42);
572 TEST(Future, whenAllVariadicReferences) {
575 Future<bool> fb = pb.getFuture();
576 Future<int> fi = pi.getFuture();
579 .then([&](Try<std::tuple<Try<bool>, Try<int>>>&& t) {
581 EXPECT_TRUE(t.hasValue());
582 EXPECT_TRUE(std::get<0>(t.value()).hasValue());
583 EXPECT_EQ(std::get<0>(t.value()).value(), true);
584 EXPECT_TRUE(std::get<1>(t.value()).hasValue());
585 EXPECT_EQ(std::get<1>(t.value()).value(), 42);
593 TEST(Future, whenAll_none) {
594 vector<Future<int>> fs;
595 auto f = whenAll(fs.begin(), fs.end());
596 EXPECT_TRUE(f.isReady());
599 TEST(Future, throwCaughtInImmediateThen) {
600 // Neither of these should throw "Promise already satisfied"
602 [=](Try<void>&&) -> int { throw std::exception(); });
604 [=](Try<void>&&) -> Future<int> { throw std::exception(); });
607 TEST(Future, throwIfFailed) {
608 makeFuture<void>(eggs)
609 .then([=](Try<void>&& t) {
610 EXPECT_THROW(t.throwIfFailed(), eggs_t);
613 .then([=](Try<void>&& t) {
614 EXPECT_NO_THROW(t.throwIfFailed());
617 makeFuture<int>(eggs)
618 .then([=](Try<int>&& t) {
619 EXPECT_THROW(t.throwIfFailed(), eggs_t);
622 .then([=](Try<int>&& t) {
623 EXPECT_NO_THROW(t.throwIfFailed());
627 TEST(Future, waitWithSemaphoreImmediate) {
628 waitWithSemaphore(makeFuture());
629 auto done = waitWithSemaphore(makeFuture(42));
633 TEST(Future, waitWithSemaphore) {
635 Future<int> f = p.getFuture();
636 std::atomic<bool> flag{false};
637 std::atomic<int> result{1};
638 std::atomic<std::thread::id> id;
640 std::thread t([&](Future<int>&& tf){
641 auto n = tf.then([&](Try<int> && t) {
642 id = std::this_thread::get_id();
646 result.store(waitWithSemaphore(std::move(n)));
652 EXPECT_EQ(result.load(), 1);
655 // validate that the continuation ended up executing in this thread, which
656 // is more to ensure that this test actually tests what it should
657 EXPECT_EQ(id, std::this_thread::get_id());
658 EXPECT_EQ(result.load(), 42);