/*
- * Copyright 2014 Facebook, Inc.
+ * Copyright 2017 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* limitations under the License.
*/
+#include <folly/futures/Future.h>
+#include <folly/Unit.h>
+#include <folly/Memory.h>
+#include <folly/Executor.h>
+#include <folly/dynamic.h>
+#include <folly/Baton.h>
+#include <folly/portability/GTest.h>
+
#include <algorithm>
#include <atomic>
-#include <folly/small_vector.h>
-#include <gtest/gtest.h>
#include <memory>
+#include <numeric>
#include <string>
#include <thread>
#include <type_traits>
-#include <unistd.h>
-#include <folly/Memory.h>
-#include <folly/Executor.h>
-#include <folly/futures/Future.h>
-#include <folly/futures/ManualExecutor.h>
-#include <folly/futures/DrivableExecutor.h>
-#include <folly/MPMCQueue.h>
-
-#include <folly/io/async/EventBase.h>
-#include <folly/io/async/Request.h>
using namespace folly;
-using std::pair;
-using std::string;
-using std::unique_ptr;
-using std::vector;
-using std::chrono::milliseconds;
#define EXPECT_TYPE(x, T) \
EXPECT_TRUE((std::is_same<decltype(x), T>::value))
-/// Simple executor that does work in another thread
-class ThreadExecutor : public Executor {
- folly::MPMCQueue<Func> funcs;
- std::atomic<bool> done {false};
- std::thread worker;
- folly::Baton<> baton;
+typedef FutureException eggs_t;
+static eggs_t eggs("eggs");
- void work() {
- baton.post();
- Func fn;
- while (!done) {
- while (!funcs.isEmpty()) {
- funcs.blockingRead(fn);
- fn();
- }
- }
- }
+// Future
- public:
- explicit ThreadExecutor(size_t n = 1024)
- : funcs(n), worker(std::bind(&ThreadExecutor::work, this)) {}
+TEST(Future, futureDefaultCtor) {
+ Future<Unit>();
+}
- ~ThreadExecutor() {
- done = true;
- funcs.write([]{});
- worker.join();
- }
+TEST(Future, futureToUnit) {
+ Future<Unit> fu = makeFuture(42).unit();
+ fu.value();
+ EXPECT_TRUE(makeFuture<int>(eggs).unit().hasException());
+}
- void add(Func fn) override {
- funcs.blockingWrite(std::move(fn));
- }
+TEST(Future, voidFutureToUnit) {
+ Future<Unit> fu = makeFuture().unit();
+ fu.value();
+ EXPECT_TRUE(makeFuture<Unit>(eggs).unit().hasException());
+}
- void waitForStartup() {
- baton.wait();
- }
-};
+TEST(Future, unitFutureToUnitIdentity) {
+ Future<Unit> fu = makeFuture(Unit{}).unit();
+ fu.value();
+ EXPECT_TRUE(makeFuture<Unit>(eggs).unit().hasException());
+}
-typedef FutureException eggs_t;
-static eggs_t eggs("eggs");
+TEST(Future, toUnitWhileInProgress) {
+ Promise<int> p;
+ Future<Unit> fu = p.getFuture().unit();
+ EXPECT_FALSE(fu.isReady());
+ p.setValue(42);
+ EXPECT_TRUE(fu.isReady());
+}
-// Future
+TEST(Future, makeFutureWithUnit) {
+ int count = 0;
+ Future<Unit> fu = makeFutureWith([&] { count++; });
+ EXPECT_EQ(1, count);
+}
+
+namespace {
+Future<int> onErrorHelperEggs(const eggs_t&) {
+ return makeFuture(10);
+}
+Future<int> onErrorHelperGeneric(const std::exception&) {
+ return makeFuture(20);
+}
+}
TEST(Future, onError) {
bool theFlag = false;
// By reference
{
- auto f = makeFuture()
- .then([] { throw eggs; })
- .onError([&] (eggs_t& e) { flag(); });
+ auto f = makeFuture().then([] {
+ throw eggs;
+ }).onError([&](eggs_t& /* e */) { flag(); });
EXPECT_FLAG();
EXPECT_NO_THROW(f.value());
}
{
auto f = makeFuture()
- .then([] { throw eggs; })
- .onError([&] (eggs_t& e) { flag(); return makeFuture(); });
+ .then([] { throw eggs; })
+ .onError([&](eggs_t& /* e */) {
+ flag();
+ return makeFuture();
+ });
EXPECT_FLAG();
EXPECT_NO_THROW(f.value());
}
// By value
{
- auto f = makeFuture()
- .then([] { throw eggs; })
- .onError([&] (eggs_t e) { flag(); });
+ auto f = makeFuture().then([] {
+ throw eggs;
+ }).onError([&](eggs_t /* e */) { flag(); });
EXPECT_FLAG();
EXPECT_NO_THROW(f.value());
}
{
auto f = makeFuture()
- .then([] { throw eggs; })
- .onError([&] (eggs_t e) { flag(); return makeFuture(); });
+ .then([] { throw eggs; })
+ .onError([&](eggs_t /* e */) {
+ flag();
+ return makeFuture();
+ });
EXPECT_FLAG();
EXPECT_NO_THROW(f.value());
}
// Polymorphic
{
- auto f = makeFuture()
- .then([] { throw eggs; })
- .onError([&] (std::exception& e) { flag(); });
+ auto f = makeFuture().then([] {
+ throw eggs;
+ }).onError([&](std::exception& /* e */) { flag(); });
EXPECT_FLAG();
EXPECT_NO_THROW(f.value());
}
{
auto f = makeFuture()
- .then([] { throw eggs; })
- .onError([&] (std::exception& e) { flag(); return makeFuture(); });
+ .then([] { throw eggs; })
+ .onError([&](std::exception& /* e */) {
+ flag();
+ return makeFuture();
+ });
EXPECT_FLAG();
EXPECT_NO_THROW(f.value());
}
// Non-exceptions
{
- auto f = makeFuture()
- .then([] { throw -1; })
- .onError([&] (int e) { flag(); });
+ auto f = makeFuture().then([] {
+ throw - 1;
+ }).onError([&](int /* e */) { flag(); });
EXPECT_FLAG();
EXPECT_NO_THROW(f.value());
}
{
auto f = makeFuture()
- .then([] { throw -1; })
- .onError([&] (int e) { flag(); return makeFuture(); });
+ .then([] { throw - 1; })
+ .onError([&](int /* e */) {
+ flag();
+ return makeFuture();
+ });
EXPECT_FLAG();
EXPECT_NO_THROW(f.value());
}
// Mutable lambda
{
- auto f = makeFuture()
- .then([] { throw eggs; })
- .onError([&] (eggs_t& e) mutable { flag(); });
+ auto f = makeFuture().then([] {
+ throw eggs;
+ }).onError([&](eggs_t& /* e */) mutable { flag(); });
EXPECT_FLAG();
EXPECT_NO_THROW(f.value());
}
{
auto f = makeFuture()
- .then([] { throw eggs; })
- .onError([&] (eggs_t& e) mutable { flag(); return makeFuture(); });
+ .then([] { throw eggs; })
+ .onError([&](eggs_t& /* e */) mutable {
+ flag();
+ return makeFuture();
+ });
EXPECT_FLAG();
EXPECT_NO_THROW(f.value());
}
+ // Function pointer
+ {
+ auto f = makeFuture()
+ .then([]() -> int { throw eggs; })
+ .onError(onErrorHelperEggs)
+ .onError(onErrorHelperGeneric);
+ EXPECT_EQ(10, f.value());
+ }
+ {
+ auto f = makeFuture()
+ .then([]() -> int { throw std::runtime_error("test"); })
+ .onError(onErrorHelperEggs)
+ .onError(onErrorHelperGeneric);
+ EXPECT_EQ(20, f.value());
+ }
+ {
+ auto f = makeFuture()
+ .then([]() -> int { throw std::runtime_error("test"); })
+ .onError(onErrorHelperEggs);
+ EXPECT_THROW(f.value(), std::runtime_error);
+ }
+
// No throw
{
auto f = makeFuture()
- .then([] { return 42; })
- .onError([&] (eggs_t& e) { flag(); return -1; });
+ .then([] { return 42; })
+ .onError([&](eggs_t& /* e */) {
+ flag();
+ return -1;
+ });
EXPECT_NO_FLAG();
EXPECT_EQ(42, f.value());
}
{
auto f = makeFuture()
- .then([] { return 42; })
- .onError([&] (eggs_t& e) { flag(); return makeFuture<int>(-1); });
+ .then([] { return 42; })
+ .onError([&](eggs_t& /* e */) {
+ flag();
+ return makeFuture<int>(-1);
+ });
EXPECT_NO_FLAG();
EXPECT_EQ(42, f.value());
}
// Catch different exception
{
- auto f = makeFuture()
- .then([] { throw eggs; })
- .onError([&] (std::runtime_error& e) { flag(); });
+ auto f = makeFuture().then([] {
+ throw eggs;
+ }).onError([&](std::runtime_error& /* e */) { flag(); });
EXPECT_NO_FLAG();
EXPECT_THROW(f.value(), eggs_t);
}
{
auto f = makeFuture()
- .then([] { throw eggs; })
- .onError([&] (std::runtime_error& e) { flag(); return makeFuture(); });
+ .then([] { throw eggs; })
+ .onError([&](std::runtime_error& /* e */) {
+ flag();
+ return makeFuture();
+ });
EXPECT_NO_FLAG();
EXPECT_THROW(f.value(), eggs_t);
}
// Returned value propagates
{
- auto f = makeFuture()
- .then([] { throw eggs; return 0; })
- .onError([&] (eggs_t& e) { return 42; });
+ auto f = makeFuture().then([]() -> int {
+ throw eggs;
+ }).onError([&](eggs_t& /* e */) { return 42; });
EXPECT_EQ(42, f.value());
}
// Returned future propagates
{
- auto f = makeFuture()
- .then([] { throw eggs; return 0; })
- .onError([&] (eggs_t& e) { return makeFuture<int>(42); });
+ auto f = makeFuture().then([]() -> int {
+ throw eggs;
+ }).onError([&](eggs_t& /* e */) { return makeFuture<int>(42); });
EXPECT_EQ(42, f.value());
}
// Throw in callback
{
auto f = makeFuture()
- .then([] { throw eggs; return 0; })
- .onError([&] (eggs_t& e) { throw e; return -1; });
+ .then([]() -> int { throw eggs; })
+ .onError([&] (eggs_t& e) -> int { throw e; });
EXPECT_THROW(f.value(), eggs_t);
}
{
auto f = makeFuture()
- .then([] { throw eggs; return 0; })
- .onError([&] (eggs_t& e) { throw e; return makeFuture<int>(-1); });
+ .then([]() -> int { throw eggs; })
+ .onError([&] (eggs_t& e) -> Future<int> { throw e; });
EXPECT_THROW(f.value(), eggs_t);
}
-}
-TEST(Future, try) {
- class A {
- public:
- A(int x) : x_(x) {}
+ // exception_wrapper, return Future<T>
+ {
+ auto f = makeFuture()
+ .then([] { throw eggs; })
+ .onError([&](exception_wrapper /* e */) {
+ flag();
+ return makeFuture();
+ });
+ EXPECT_FLAG();
+ EXPECT_NO_THROW(f.value());
+ }
- int x() const {
- return x_;
- }
- private:
- int x_;
- };
+ // exception_wrapper, return Future<T> but throw
+ {
+ auto f = makeFuture()
+ .then([]() -> int {
+ throw eggs;
+ })
+ .onError([&](exception_wrapper /* e */) -> Future<int> {
+ flag();
+ throw eggs;
+ });
+ EXPECT_FLAG();
+ EXPECT_THROW(f.value(), eggs_t);
+ }
- A a(5);
- Try<A> t_a(std::move(a));
+ // exception_wrapper, return T
+ {
+ auto f = makeFuture()
+ .then([]() -> int {
+ throw eggs;
+ })
+ .onError([&](exception_wrapper /* e */) {
+ flag();
+ return -1;
+ });
+ EXPECT_FLAG();
+ EXPECT_EQ(-1, f.value());
+ }
- Try<void> t_void;
+ // exception_wrapper, return T but throw
+ {
+ auto f = makeFuture()
+ .then([]() -> int {
+ throw eggs;
+ })
+ .onError([&](exception_wrapper /* e */) -> int {
+ flag();
+ throw eggs;
+ });
+ EXPECT_FLAG();
+ EXPECT_THROW(f.value(), eggs_t);
+ }
+
+ // const exception_wrapper&
+ {
+ auto f = makeFuture()
+ .then([] { throw eggs; })
+ .onError([&](const exception_wrapper& /* e */) {
+ flag();
+ return makeFuture();
+ });
+ EXPECT_FLAG();
+ EXPECT_NO_THROW(f.value());
+ }
- EXPECT_EQ(5, t_a.value().x());
}
TEST(Future, special) {
}
TEST(Future, then) {
- auto f = makeFuture<string>("0")
- .then([](){ return makeFuture<string>("1"); })
- .then([](Try<string>&& t) { return makeFuture(t.value() + ";2"); })
- .then([](const Try<string>&& t) { return makeFuture(t.value() + ";3"); })
- .then([](Try<string>& t) { return makeFuture(t.value() + ";4"); })
- .then([](const Try<string>& t) { return makeFuture(t.value() + ";5"); })
- .then([](Try<string> t) { return makeFuture(t.value() + ";6"); })
- .then([](const Try<string> t) { return makeFuture(t.value() + ";7"); })
- .then([](string&& s) { return makeFuture(s + ";8"); })
- .then([](const string&& s) { return makeFuture(s + ";9"); })
- .then([](string& s) { return makeFuture(s + ";10"); })
- .then([](const string& s) { return makeFuture(s + ";11"); })
- .then([](string s) { return makeFuture(s + ";12"); })
- .then([](const string s) { return makeFuture(s + ";13"); })
+ auto f = makeFuture<std::string>("0")
+ .then([](){
+ return makeFuture<std::string>("1"); })
+ .then([](Try<std::string>&& t) {
+ return makeFuture(t.value() + ";2"); })
+ .then([](const Try<std::string>&& t) {
+ return makeFuture(t.value() + ";3"); })
+ .then([](Try<std::string>& t) {
+ return makeFuture(t.value() + ";4"); })
+ .then([](const Try<std::string>& t) {
+ return makeFuture(t.value() + ";5"); })
+ .then([](Try<std::string> t) {
+ return makeFuture(t.value() + ";6"); })
+ .then([](const Try<std::string> t) {
+ return makeFuture(t.value() + ";7"); })
+ .then([](std::string&& s) {
+ return makeFuture(s + ";8"); })
+ .then([](const std::string&& s) {
+ return makeFuture(s + ";9"); })
+ .then([](std::string& s) {
+ return makeFuture(s + ";10"); })
+ .then([](const std::string& s) {
+ return makeFuture(s + ";11"); })
+ .then([](std::string s) {
+ return makeFuture(s + ";12"); })
+ .then([](const std::string s) {
+ return makeFuture(s + ";13"); })
;
EXPECT_EQ(f.value(), "1;2;3;4;5;6;7;8;9;10;11;12;13");
}
.then([&](Try<int>&& t) { flag = true; EXPECT_EQ(42, t.value()); });
EXPECT_TRUE(flag); flag = false;
- makeFuture().then([&](Try<void>&& t) { flag = true; t.value(); });
+ makeFuture().then([&](Try<Unit>&& t) { flag = true; t.value(); });
EXPECT_TRUE(flag); flag = false;
- Promise<void> p;
- auto f = p.getFuture().then([&](Try<void>&& t) { flag = true; });
+ Promise<Unit> p;
+ auto f = p.getFuture().then([&](Try<Unit>&& /* t */) { flag = true; });
EXPECT_FALSE(flag);
EXPECT_FALSE(f.isReady());
p.setValue();
});
EXPECT_TRUE(flag); flag = false;
- auto f = makeFuture<int>(eggs).then([&](int i){});
+ auto f = makeFuture<int>(eggs).then([&](int /* i */) {});
EXPECT_THROW(f.value(), eggs_t);
- f = makeFuture<void>(eggs).then([&]{});
+ f = makeFuture<Unit>(eggs).then([&]{});
EXPECT_THROW(f.value(), eggs_t);
}
.then([&](Try<int>&& t) { flag = true; EXPECT_EQ(42, t.value()); });
EXPECT_TRUE(flag); flag = false;
- makeFuture()
- .then([]{ return makeFuture(); })
- .then([&](Try<void>&& t) { flag = true; });
+ makeFuture().then([] {
+ return makeFuture();
+ }).then([&](Try<Unit>&& /* t */) { flag = true; });
EXPECT_TRUE(flag); flag = false;
}
-static string doWorkStatic(Try<string>&& t) {
+static std::string doWorkStatic(Try<std::string>&& t) {
return t.value() + ";static";
}
TEST(Future, thenFunction) {
struct Worker {
- string doWork(Try<string>&& t) {
+ std::string doWork(Try<std::string>&& t) {
return t.value() + ";class";
}
- static string doWorkStatic(Try<string>&& t) {
+ static std::string doWorkStatic(Try<std::string>&& t) {
return t.value() + ";class-static";
}
} w;
- auto f = makeFuture<string>("start")
+ auto f = makeFuture<std::string>("start")
.then(doWorkStatic)
.then(Worker::doWorkStatic)
.then(&Worker::doWork, &w);
EXPECT_EQ(f.value(), "start;static;class-static;class");
}
-static Future<string> doWorkStaticFuture(Try<string>&& t) {
+static Future<std::string> doWorkStaticFuture(Try<std::string>&& t) {
return makeFuture(t.value() + ";static");
}
TEST(Future, thenFunctionFuture) {
struct Worker {
- Future<string> doWorkFuture(Try<string>&& t) {
+ Future<std::string> doWorkFuture(Try<std::string>&& t) {
return makeFuture(t.value() + ";class");
}
- static Future<string> doWorkStaticFuture(Try<string>&& t) {
+ static Future<std::string> doWorkStaticFuture(Try<std::string>&& t) {
return makeFuture(t.value() + ";class-static");
}
} w;
- auto f = makeFuture<string>("start")
+ auto f = makeFuture<std::string>("start")
.then(doWorkStaticFuture)
.then(Worker::doWorkStaticFuture)
.then(&Worker::doWorkFuture, &w);
EXPECT_EQ(f.value(), "start;static;class-static;class");
}
+TEST(Future, thenStdFunction) {
+ {
+ std::function<int()> fn = [](){ return 42; };
+ auto f = makeFuture().then(std::move(fn));
+ EXPECT_EQ(f.value(), 42);
+ }
+ {
+ std::function<int(int)> fn = [](int i){ return i + 23; };
+ auto f = makeFuture(19).then(std::move(fn));
+ EXPECT_EQ(f.value(), 42);
+ }
+ {
+ std::function<int(Try<int>&)> fn = [](Try<int>& t){ return t.value() + 2; };
+ auto f = makeFuture(1).then(std::move(fn));
+ EXPECT_EQ(f.value(), 3);
+ }
+ {
+ bool flag = false;
+ std::function<void()> fn = [&flag](){ flag = true; };
+ auto f = makeFuture().then(std::move(fn));
+ EXPECT_TRUE(f.isReady());
+ EXPECT_TRUE(flag);
+ }
+}
+
TEST(Future, thenBind) {
auto l = []() {
return makeFuture("bind");
}
TEST(Future, thenBindTry) {
- auto l = [](Try<string>&& t) {
+ auto l = [](Try<std::string>&& t) {
return makeFuture(t.value() + ";bind");
};
auto b = std::bind(l, std::placeholders::_1);
- auto f = makeFuture<string>("start").then(std::move(b));
+ auto f = makeFuture<std::string>("start").then(std::move(b));
EXPECT_EQ(f.value(), "start;bind");
}
TEST(Future, value) {
- auto f = makeFuture(unique_ptr<int>(new int(42)));
+ auto f = makeFuture(std::unique_ptr<int>(new int(42)));
auto up = std::move(f.value());
EXPECT_EQ(42, *up);
EXPECT_EQ(42, makeFuture<float>(42).value());
auto fun = [] { return 42; };
- EXPECT_TYPE(makeFutureTry(fun), Future<int>);
- EXPECT_EQ(42, makeFutureTry(fun).value());
+ EXPECT_TYPE(makeFutureWith(fun), Future<int>);
+ EXPECT_EQ(42, makeFutureWith(fun).value());
- auto failfun = []() -> int { throw eggs; };
- EXPECT_TYPE(makeFutureTry(failfun), Future<int>);
- EXPECT_THROW(makeFutureTry(failfun).value(), eggs_t);
+ auto funf = [] { return makeFuture<int>(43); };
+ EXPECT_TYPE(makeFutureWith(funf), Future<int>);
+ EXPECT_EQ(43, makeFutureWith(funf).value());
- EXPECT_TYPE(makeFuture(), Future<void>);
-}
+ auto failfun = []() -> int { throw eggs; };
+ EXPECT_TYPE(makeFutureWith(failfun), Future<int>);
+ EXPECT_NO_THROW(makeFutureWith(failfun));
+ EXPECT_THROW(makeFutureWith(failfun).value(), eggs_t);
-// Promise
+ auto failfunf = []() -> Future<int> { throw eggs; };
+ EXPECT_TYPE(makeFutureWith(failfunf), Future<int>);
+ EXPECT_NO_THROW(makeFutureWith(failfunf));
+ EXPECT_THROW(makeFutureWith(failfunf).value(), eggs_t);
-TEST(Promise, special) {
- EXPECT_FALSE(std::is_copy_constructible<Promise<int>>::value);
- EXPECT_FALSE(std::is_copy_assignable<Promise<int>>::value);
- EXPECT_TRUE(std::is_move_constructible<Promise<int>>::value);
- EXPECT_TRUE(std::is_move_assignable<Promise<int>>::value);
+ EXPECT_TYPE(makeFuture(), Future<Unit>);
}
-TEST(Promise, getFuture) {
+TEST(Future, finish) {
+ auto x = std::make_shared<int>(0);
+
Promise<int> p;
- Future<int> f = p.getFuture();
- EXPECT_FALSE(f.isReady());
-}
+ auto f = p.getFuture().then([x](Try<int>&& t) { *x = t.value(); });
-TEST(Promise, setValue) {
- Promise<int> fund;
- auto ffund = fund.getFuture();
- fund.setValue(42);
- EXPECT_EQ(42, ffund.value());
+ // The callback hasn't executed
+ EXPECT_EQ(0, *x);
- struct Foo {
- string name;
- int value;
- };
+ // The callback has a reference to x
+ EXPECT_EQ(2, x.use_count());
- Promise<Foo> pod;
- auto fpod = pod.getFuture();
- Foo f = {"the answer", 42};
- pod.setValue(f);
- Foo f2 = fpod.value();
- EXPECT_EQ(f.name, f2.name);
- EXPECT_EQ(f.value, f2.value);
-
- pod = Promise<Foo>();
- fpod = pod.getFuture();
- pod.setValue(std::move(f2));
- Foo f3 = fpod.value();
- EXPECT_EQ(f.name, f3.name);
- EXPECT_EQ(f.value, f3.value);
-
- Promise<unique_ptr<int>> mov;
- auto fmov = mov.getFuture();
- mov.setValue(unique_ptr<int>(new int(42)));
- unique_ptr<int> ptr = std::move(fmov.value());
- EXPECT_EQ(42, *ptr);
-
- Promise<void> v;
- auto fv = v.getFuture();
- v.setValue();
- EXPECT_TRUE(fv.isReady());
-}
+ p.setValue(42);
-TEST(Promise, setException) {
- {
- Promise<void> p;
- auto f = p.getFuture();
- p.setException(eggs);
- EXPECT_THROW(f.value(), eggs_t);
- }
- {
- Promise<void> p;
- auto f = p.getFuture();
- try {
- throw eggs;
- } catch (...) {
- p.setException(exception_wrapper(std::current_exception()));
- }
- EXPECT_THROW(f.value(), eggs_t);
- }
-}
+ // the callback has executed
+ EXPECT_EQ(42, *x);
-TEST(Promise, fulfil) {
- {
- Promise<int> p;
- auto f = p.getFuture();
- p.fulfil([] { return 42; });
- EXPECT_EQ(42, f.value());
- }
- {
- Promise<int> p;
- auto f = p.getFuture();
- p.fulfil([]() -> int { throw eggs; });
- EXPECT_THROW(f.value(), eggs_t);
- }
+ // the callback has been destructed
+ // and has released its reference to x
+ EXPECT_EQ(1, x.use_count());
}
-TEST(Future, finish) {
+TEST(Future, finishBigLambda) {
auto x = std::make_shared<int>(0);
- {
- Promise<int> p;
- auto f = p.getFuture().then([x](Try<int>&& t) { *x = t.value(); });
- // The callback hasn't executed
- EXPECT_EQ(0, *x);
+ // bulk_data, to be captured in the lambda passed to Future::then.
+ // This is meant to force that the lambda can't be stored inside
+ // the Future object.
+ std::array<char, sizeof(detail::Core<int>)> bulk_data = {{0}};
- // The callback has a reference to x
- EXPECT_EQ(2, x.use_count());
+ // suppress gcc warning about bulk_data not being used
+ EXPECT_EQ(bulk_data[0], 0);
- p.setValue(42);
+ Promise<int> p;
+ auto f = p.getFuture().then([x, bulk_data](Try<int>&& t) {
+ (void)bulk_data;
+ *x = t.value();
+ });
+
+ // The callback hasn't executed
+ EXPECT_EQ(0, *x);
+
+ // The callback has a reference to x
+ EXPECT_EQ(2, x.use_count());
+
+ p.setValue(42);
+
+ // the callback has executed
+ EXPECT_EQ(42, *x);
- // the callback has executed
- EXPECT_EQ(42, *x);
- }
// the callback has been destructed
// and has released its reference to x
EXPECT_EQ(1, x.use_count());
EXPECT_EQ(7, f.value());
}
-TEST(Future, whenAll) {
- // returns a vector variant
- {
- vector<Promise<int>> promises(10);
- vector<Future<int>> futures;
-
- for (auto& p : promises)
- futures.push_back(p.getFuture());
-
- auto allf = whenAll(futures.begin(), futures.end());
-
- random_shuffle(promises.begin(), promises.end());
- for (auto& p : promises) {
- EXPECT_FALSE(allf.isReady());
- p.setValue(42);
- }
-
- EXPECT_TRUE(allf.isReady());
- auto& results = allf.value();
- for (auto& t : results) {
- EXPECT_EQ(42, t.value());
- }
- }
-
- // check error semantics
- {
- vector<Promise<int>> promises(4);
- vector<Future<int>> futures;
-
- for (auto& p : promises)
- futures.push_back(p.getFuture());
-
- auto allf = whenAll(futures.begin(), futures.end());
-
-
- promises[0].setValue(42);
- promises[1].setException(eggs);
-
- EXPECT_FALSE(allf.isReady());
-
- promises[2].setValue(42);
-
- EXPECT_FALSE(allf.isReady());
-
- promises[3].setException(eggs);
-
- EXPECT_TRUE(allf.isReady());
- EXPECT_FALSE(allf.getTry().hasException());
-
- auto& results = allf.value();
- EXPECT_EQ(42, results[0].value());
- EXPECT_TRUE(results[1].hasException());
- EXPECT_EQ(42, results[2].value());
- EXPECT_TRUE(results[3].hasException());
- }
-
- // check that futures are ready in then()
- {
- vector<Promise<void>> promises(10);
- vector<Future<void>> futures;
-
- for (auto& p : promises)
- futures.push_back(p.getFuture());
-
- auto allf = whenAll(futures.begin(), futures.end())
- .then([](Try<vector<Try<void>>>&& ts) {
- for (auto& f : ts.value())
- f.value();
- });
-
- random_shuffle(promises.begin(), promises.end());
- for (auto& p : promises)
- p.setValue();
- EXPECT_TRUE(allf.isReady());
- }
-}
-
-
-TEST(Future, whenAny) {
- {
- vector<Promise<int>> promises(10);
- vector<Future<int>> futures;
-
- for (auto& p : promises)
- futures.push_back(p.getFuture());
-
- for (auto& f : futures) {
- EXPECT_FALSE(f.isReady());
- }
-
- auto anyf = whenAny(futures.begin(), futures.end());
-
- /* futures were moved in, so these are invalid now */
- EXPECT_FALSE(anyf.isReady());
-
- promises[7].setValue(42);
- EXPECT_TRUE(anyf.isReady());
- auto& idx_fut = anyf.value();
-
- auto i = idx_fut.first;
- EXPECT_EQ(7, i);
-
- auto& f = idx_fut.second;
- EXPECT_EQ(42, f.value());
- }
-
- // error
- {
- vector<Promise<void>> promises(10);
- vector<Future<void>> futures;
-
- for (auto& p : promises)
- futures.push_back(p.getFuture());
-
- for (auto& f : futures) {
- EXPECT_FALSE(f.isReady());
- }
-
- auto anyf = whenAny(futures.begin(), futures.end());
-
- EXPECT_FALSE(anyf.isReady());
-
- promises[3].setException(eggs);
- EXPECT_TRUE(anyf.isReady());
- EXPECT_TRUE(anyf.value().second.hasException());
- }
-
- // then()
- {
- vector<Promise<int>> promises(10);
- vector<Future<int>> futures;
-
- for (auto& p : promises)
- futures.push_back(p.getFuture());
-
- auto anyf = whenAny(futures.begin(), futures.end())
- .then([](pair<size_t, Try<int>> p) {
- EXPECT_EQ(42, p.second.value());
- });
-
- promises[3].setValue(42);
- EXPECT_TRUE(anyf.isReady());
- }
-}
-
-
-TEST(when, already_completed) {
- {
- vector<Future<void>> fs;
- for (int i = 0; i < 10; i++)
- fs.push_back(makeFuture());
-
- whenAll(fs.begin(), fs.end())
- .then([&](vector<Try<void>> ts) {
- EXPECT_EQ(fs.size(), ts.size());
- });
- }
- {
- vector<Future<int>> fs;
- for (int i = 0; i < 10; i++)
- fs.push_back(makeFuture(i));
-
- whenAny(fs.begin(), fs.end())
- .then([&](pair<size_t, Try<int>> p) {
- EXPECT_EQ(p.first, p.second.value());
- });
- }
-}
-
-TEST(when, whenN) {
- vector<Promise<void>> promises(10);
- vector<Future<void>> futures;
-
- for (auto& p : promises)
- futures.push_back(p.getFuture());
-
- bool flag = false;
- size_t n = 3;
- whenN(futures.begin(), futures.end(), n)
- .then([&](vector<pair<size_t, Try<void>>> v) {
- flag = true;
- EXPECT_EQ(n, v.size());
- for (auto& tt : v)
- EXPECT_TRUE(tt.second.hasValue());
- });
-
- promises[0].setValue();
- EXPECT_FALSE(flag);
- promises[1].setValue();
- EXPECT_FALSE(flag);
- promises[2].setValue();
- EXPECT_TRUE(flag);
-}
-
-/* Ensure that we can compile when_{all,any} with folly::small_vector */
-TEST(when, small_vector) {
-
- static_assert(!FOLLY_IS_TRIVIALLY_COPYABLE(Future<void>),
- "Futures should not be trivially copyable");
- static_assert(!FOLLY_IS_TRIVIALLY_COPYABLE(Future<int>),
- "Futures should not be trivially copyable");
-
- using folly::small_vector;
- {
- small_vector<Future<void>> futures;
-
- for (int i = 0; i < 10; i++)
- futures.push_back(makeFuture());
-
- auto anyf = whenAny(futures.begin(), futures.end());
- }
-
- {
- small_vector<Future<void>> futures;
-
- for (int i = 0; i < 10; i++)
- futures.push_back(makeFuture());
-
- auto allf = whenAll(futures.begin(), futures.end());
- }
-}
-
-TEST(Future, whenAllVariadic) {
- Promise<bool> pb;
- Promise<int> pi;
- Future<bool> fb = pb.getFuture();
- Future<int> fi = pi.getFuture();
- bool flag = false;
- whenAll(std::move(fb), std::move(fi))
- .then([&](std::tuple<Try<bool>, Try<int>> tup) {
- flag = true;
- EXPECT_TRUE(std::get<0>(tup).hasValue());
- EXPECT_EQ(std::get<0>(tup).value(), true);
- EXPECT_TRUE(std::get<1>(tup).hasValue());
- EXPECT_EQ(std::get<1>(tup).value(), 42);
- });
- pb.setValue(true);
- EXPECT_FALSE(flag);
- pi.setValue(42);
- EXPECT_TRUE(flag);
-}
-
-TEST(Future, whenAllVariadicReferences) {
- Promise<bool> pb;
- Promise<int> pi;
- Future<bool> fb = pb.getFuture();
- Future<int> fi = pi.getFuture();
- bool flag = false;
- whenAll(fb, fi)
- .then([&](std::tuple<Try<bool>, Try<int>> tup) {
- flag = true;
- EXPECT_TRUE(std::get<0>(tup).hasValue());
- EXPECT_EQ(std::get<0>(tup).value(), true);
- EXPECT_TRUE(std::get<1>(tup).hasValue());
- EXPECT_EQ(std::get<1>(tup).value(), 42);
- });
- pb.setValue(true);
- EXPECT_FALSE(flag);
- pi.setValue(42);
- EXPECT_TRUE(flag);
-}
-
-TEST(Future, whenAll_none) {
- vector<Future<int>> fs;
- auto f = whenAll(fs.begin(), fs.end());
- EXPECT_TRUE(f.isReady());
-}
-
TEST(Future, throwCaughtInImmediateThen) {
// Neither of these should throw "Promise already satisfied"
makeFuture().then(
- [=](Try<void>&&) -> int { throw std::exception(); });
+ [=](Try<Unit>&&) -> int { throw std::exception(); });
makeFuture().then(
- [=](Try<void>&&) -> Future<int> { throw std::exception(); });
+ [=](Try<Unit>&&) -> Future<int> { throw std::exception(); });
}
TEST(Future, throwIfFailed) {
- makeFuture<void>(eggs)
- .then([=](Try<void>&& t) {
+ makeFuture<Unit>(eggs)
+ .then([=](Try<Unit>&& t) {
EXPECT_THROW(t.throwIfFailed(), eggs_t);
});
makeFuture()
- .then([=](Try<void>&& t) {
+ .then([=](Try<Unit>&& t) {
EXPECT_NO_THROW(t.throwIfFailed());
});
});
}
-TEST(Future, waitImmediate) {
- makeFuture().wait();
- auto done = makeFuture(42).wait().value();
- EXPECT_EQ(42, done);
-
- vector<int> v{1,2,3};
- auto done_v = makeFuture(v).wait().value();
- EXPECT_EQ(v.size(), done_v.size());
- EXPECT_EQ(v, done_v);
-
- vector<Future<void>> v_f;
- v_f.push_back(makeFuture());
- v_f.push_back(makeFuture());
- auto done_v_f = whenAll(v_f.begin(), v_f.end()).wait().value();
- EXPECT_EQ(2, done_v_f.size());
-
- vector<Future<bool>> v_fb;
- v_fb.push_back(makeFuture(true));
- v_fb.push_back(makeFuture(false));
- auto fut = whenAll(v_fb.begin(), v_fb.end());
- auto done_v_fb = std::move(fut.wait().value());
- EXPECT_EQ(2, done_v_fb.size());
-}
-
-TEST(Future, wait) {
- Promise<int> p;
- Future<int> f = p.getFuture();
- std::atomic<bool> flag{false};
- std::atomic<int> result{1};
- std::atomic<std::thread::id> id;
-
- std::thread t([&](Future<int>&& tf){
- auto n = tf.then([&](Try<int> && t) {
- id = std::this_thread::get_id();
- return t.value();
- });
- flag = true;
- result.store(n.wait().value());
- },
- std::move(f)
- );
- while(!flag){}
- EXPECT_EQ(result.load(), 1);
- p.setValue(42);
- t.join();
- // validate that the callback ended up executing in this thread, which
- // is more to ensure that this test actually tests what it should
- EXPECT_EQ(id, std::this_thread::get_id());
- EXPECT_EQ(result.load(), 42);
-}
-
-struct MoveFlag {
- MoveFlag() = default;
- MoveFlag(const MoveFlag&) = delete;
- MoveFlag(MoveFlag&& other) noexcept {
- other.moved = true;
- }
- bool moved{false};
-};
-
-TEST(Future, waitReplacesSelf) {
- // wait
- {
- // lvalue
- auto f1 = makeFuture(MoveFlag());
- f1.wait();
- EXPECT_FALSE(f1.value().moved);
-
- // rvalue
- auto f2 = makeFuture(MoveFlag()).wait();
- EXPECT_FALSE(f2.value().moved);
- }
-
- // wait(Duration)
- {
- // lvalue
- auto f1 = makeFuture(MoveFlag());
- f1.wait(milliseconds(1));
- EXPECT_FALSE(f1.value().moved);
-
- // rvalue
- auto f2 = makeFuture(MoveFlag()).wait(milliseconds(1));
- EXPECT_FALSE(f2.value().moved);
- }
-
- // waitVia
- {
- folly::EventBase eb;
- // lvalue
- auto f1 = makeFuture(MoveFlag());
- f1.waitVia(&eb);
- EXPECT_FALSE(f1.value().moved);
-
- // rvalue
- auto f2 = makeFuture(MoveFlag()).waitVia(&eb);
- EXPECT_FALSE(f2.value().moved);
- }
-}
-
-TEST(Future, waitWithDuration) {
- {
- Promise<int> p;
- Future<int> f = p.getFuture();
- f.wait(milliseconds(1));
- EXPECT_FALSE(f.isReady());
- p.setValue(1);
- EXPECT_TRUE(f.isReady());
- }
- {
- Promise<int> p;
- Future<int> f = p.getFuture();
- p.setValue(1);
- f.wait(milliseconds(1));
- EXPECT_TRUE(f.isReady());
- }
- {
- vector<Future<bool>> v_fb;
- v_fb.push_back(makeFuture(true));
- v_fb.push_back(makeFuture(false));
- auto f = whenAll(v_fb.begin(), v_fb.end());
- f.wait(milliseconds(1));
- EXPECT_TRUE(f.isReady());
- EXPECT_EQ(2, f.value().size());
- }
- {
- vector<Future<bool>> v_fb;
- Promise<bool> p1;
- Promise<bool> p2;
- v_fb.push_back(p1.getFuture());
- v_fb.push_back(p2.getFuture());
- auto f = whenAll(v_fb.begin(), v_fb.end());
- f.wait(milliseconds(1));
- EXPECT_FALSE(f.isReady());
- p1.setValue(true);
- EXPECT_FALSE(f.isReady());
- p2.setValue(true);
- EXPECT_TRUE(f.isReady());
- }
- {
- auto f = makeFuture().wait(milliseconds(1));
- EXPECT_TRUE(f.isReady());
- }
-
- {
- Promise<void> p;
- auto start = std::chrono::steady_clock::now();
- auto f = p.getFuture().wait(milliseconds(100));
- auto elapsed = std::chrono::steady_clock::now() - start;
- EXPECT_GE(elapsed, milliseconds(100));
- EXPECT_FALSE(f.isReady());
- p.setValue();
- EXPECT_TRUE(f.isReady());
- }
-
- {
- // Try to trigger the race where the resultant Future is not yet complete
- // even if we didn't hit the timeout, and make sure we deal with it properly
- Promise<void> p;
- folly::Baton<> b;
- auto t = std::thread([&]{
- b.post();
- std::this_thread::sleep_for(milliseconds(100));
- p.setValue();
- });
- b.wait();
- auto f = p.getFuture().wait(std::chrono::seconds(3600));
- EXPECT_TRUE(f.isReady());
- t.join();
- }
-}
-
-class DummyDrivableExecutor : public DrivableExecutor {
- public:
- void add(Func f) override {}
- void drive() override { ran = true; }
- bool ran{false};
-};
-
-TEST(Future, getVia) {
- {
- // non-void
- ManualExecutor x;
- auto f = via(&x).then([]{ return true; });
- EXPECT_TRUE(f.getVia(&x));
- }
-
- {
- // void
- ManualExecutor x;
- auto f = via(&x).then();
- f.getVia(&x);
- }
-
- {
- DummyDrivableExecutor x;
- auto f = makeFuture(true);
- EXPECT_TRUE(f.getVia(&x));
- EXPECT_FALSE(x.ran);
- }
-}
-
-TEST(Future, waitVia) {
- {
- ManualExecutor x;
- auto f = via(&x).then();
- EXPECT_FALSE(f.isReady());
- f.waitVia(&x);
- EXPECT_TRUE(f.isReady());
- }
-
- {
- // try rvalue as well
- ManualExecutor x;
- auto f = via(&x).activate().then().waitVia(&x);
- EXPECT_TRUE(f.isReady());
- }
-
- {
- DummyDrivableExecutor x;
- makeFuture(true).waitVia(&x);
- EXPECT_FALSE(x.ran);
- }
-}
-
-TEST(Future, callbackAfterActivate) {
- Promise<void> p;
- auto f = p.getFuture();
- f.deactivate();
-
- size_t count = 0;
- f.then([&](Try<void>&&) { count++; });
-
- p.setValue();
- EXPECT_EQ(0, count);
-
- f.activate();
- EXPECT_EQ(1, count);
-}
-
-TEST(Future, activateOnDestruct) {
- auto f = std::make_shared<Future<void>>(makeFuture());
- f->deactivate();
-
- size_t count = 0;
- f->then([&](Try<void>&&) { count++; });
- EXPECT_EQ(0, count);
-
- f.reset();
- EXPECT_EQ(1, count);
-}
-
-TEST(Future, viaActsCold) {
- ManualExecutor x;
- size_t count = 0;
-
- auto fv = via(&x);
- fv.then([&](Try<void>&&) { count++; });
-
- EXPECT_EQ(0, count);
-
- fv.activate();
-
- EXPECT_EQ(1, x.run());
- EXPECT_EQ(1, count);
-}
-
-TEST(Future, viaIsCold) {
- ManualExecutor x;
- EXPECT_FALSE(via(&x).isActive());
-}
-
-TEST(Future, viaRaces) {
- ManualExecutor x;
- Promise<void> p;
- auto tid = std::this_thread::get_id();
- bool done = false;
-
- std::thread t1([&] {
- p.getFuture()
- .via(&x)
- .then([&](Try<void>&&) { EXPECT_EQ(tid, std::this_thread::get_id()); })
- .then([&](Try<void>&&) { EXPECT_EQ(tid, std::this_thread::get_id()); })
- .then([&](Try<void>&&) { done = true; });
- });
-
- std::thread t2([&] {
- p.setValue();
- });
-
- while (!done) x.run();
- t1.join();
- t2.join();
-}
-
-// TODO(#4920689)
-TEST(Future, viaRaces_2stage) {
- ManualExecutor x;
- Promise<void> p;
- auto tid = std::this_thread::get_id();
- bool done = false;
-
- std::thread t1([&] {
- auto f2 = p.getFuture().via(&x);
- f2.then([&](Try<void>&&) { EXPECT_EQ(tid, std::this_thread::get_id()); })
- .then([&](Try<void>&&) { EXPECT_EQ(tid, std::this_thread::get_id()); })
- .then([&](Try<void>&&) { done = true; });
-
- // the bug was in the promise being fulfilled before f2 is reactivated. we
- // could sleep, but yielding should cause this to fail with reasonable
- // probability
- std::this_thread::yield();
- f2.activate();
- });
-
- std::thread t2([&] {
- p.setValue();
- });
-
- while (!done) x.run();
- t1.join();
- t2.join();
-}
-
-TEST(Future, getFuture_after_setValue) {
+TEST(Future, getFutureAfterSetValue) {
Promise<int> p;
p.setValue(42);
EXPECT_EQ(42, p.getFuture().value());
}
-TEST(Future, getFuture_after_setException) {
- Promise<void> p;
- p.fulfil([]() -> void { throw std::logic_error("foo"); });
+TEST(Future, getFutureAfterSetException) {
+ Promise<Unit> p;
+ p.setWith([]() -> void { throw std::logic_error("foo"); });
EXPECT_THROW(p.getFuture().value(), std::logic_error);
}
// slow test so I won't do that but if it ever fails, take it seriously, and
// run the test binary with "--gtest_repeat=10000 --gtest_filter=*detachRace"
// (Don't forget to enable ASAN)
- auto p =
folly::make_unique<Promise<bool>>();
- auto f = folly::make_unique<Future<bool>>(p->getFuture());
+ auto p =
std::make_unique<Promise<bool>>();
+ auto f = std::make_unique<Future<bool>>(p->getFuture());
folly::Baton<> baton;
std::thread t1([&]{
baton.post();
t1.join();
}
-class TestData : public RequestData {
- public:
- explicit TestData(int data) : data_(data) {}
- virtual ~TestData() {}
- int data_;
-};
-
-TEST(Future, context) {
-
- // Start a new context
- RequestContext::create();
-
- EXPECT_EQ(nullptr, RequestContext::get()->getContextData("test"));
-
- // Set some test data
- RequestContext::get()->setContextData(
- "test",
- std::unique_ptr<TestData>(new TestData(10)));
-
- // Start a future
- Promise<void> p;
- auto future = p.getFuture().then([&]{
- // Check that the context followed the future
- EXPECT_TRUE(RequestContext::get() != nullptr);
- auto a = dynamic_cast<TestData*>(
- RequestContext::get()->getContextData("test"));
- auto data = a->data_;
- EXPECT_EQ(10, data);
- });
-
- // Clear the context
- RequestContext::setContext(nullptr);
-
- EXPECT_EQ(nullptr, RequestContext::get()->getContextData("test"));
-
- // Fulfil the promise
- p.setValue();
-}
-
-
-// This only fails about 1 in 1k times when the bug is present :(
-TEST(Future, t5506504) {
- ThreadExecutor x;
-
- auto fn = [&x]{
- auto promises = std::make_shared<vector<Promise<void>>>(4);
- vector<Future<void>> futures;
-
- for (auto& p : *promises) {
- futures.emplace_back(
- p.getFuture()
- .via(&x)
- .then([](Try<void>&&){}));
- }
-
- x.waitForStartup();
- x.add([promises]{
- for (auto& p : *promises) p.setValue();
- });
-
- return whenAll(futures.begin(), futures.end());
- };
-
- fn().wait();
-}
-
// Test of handling of a circular dependency. It's never recommended
// to have one because of possible memory leaks. Here we test that
// we can handle freeing of the Future while it is running.
Promise<int64_t> promise;
auto ptr = std::make_shared<Future<int64_t>>(promise.getFuture());
- ptr->then(
- [ptr] (folly::Try<int64_t>&& uid) mutable {
- EXPECT_EQ(1, ptr.use_count());
+ ptr->then([ptr](folly::Try<int64_t>&& /* uid */) mutable {
+ EXPECT_EQ(1, ptr.use_count());
- // Leaving no references to ourselves.
- ptr.reset();
- EXPECT_EQ(0, ptr.use_count());
- }
- );
+ // Leaving no references to ourselves.
+ ptr.reset();
+ EXPECT_EQ(0, ptr.use_count());
+ });
EXPECT_EQ(2, ptr.use_count());
ptr.reset();
- promise.fulfil([]{return 1l;});
+ promise.setValue(1);
}
TEST(Future, Constructor) {
auto f1 = []() -> Future<int> { return Future<int>(3); }();
EXPECT_EQ(f1.value(), 3);
- auto f2 = []() -> Future<void> { return Future<void>(); }();
+ auto f2 = []() -> Future<Unit> { return Future<Unit>(); }();
EXPECT_NO_THROW(f2.value());
}
EXPECT_EQ(f1.value(), 3);
// Unfortunately, the C++ standard does not allow the
// following implicit conversion to work:
- //auto f2 = []() -> Future<void> { }();
+ //auto f2 = []() -> Future<Unit> { }();
+}
+
+TEST(Future, thenDynamic) {
+ // folly::dynamic has a constructor that takes any T, this test makes
+ // sure that we call the then lambda with folly::dynamic and not
+ // Try<folly::dynamic> because that then fails to compile
+ Promise<folly::dynamic> p;
+ Future<folly::dynamic> f = p.getFuture().then(
+ [](const folly::dynamic& d) {
+ return folly::dynamic(d.asInt() + 3);
+ }
+ );
+ p.setValue(2);
+ EXPECT_EQ(f.get(), 5);
+}
+
+TEST(Future, RequestContext) {
+ class NewThreadExecutor : public Executor {
+ public:
+ ~NewThreadExecutor() override {
+ std::for_each(v_.begin(), v_.end(), [](std::thread& t){ t.join(); });
+ }
+ void add(Func f) override {
+ if (throwsOnAdd_) { throw std::exception(); }
+ v_.emplace_back(std::move(f));
+ }
+ void addWithPriority(Func f, int8_t /* prio */) override {
+ add(std::move(f));
+ }
+ uint8_t getNumPriorities() const override { return numPriorities_; }
+
+ void setHandlesPriorities() { numPriorities_ = 2; }
+ void setThrowsOnAdd() { throwsOnAdd_ = true; }
+ private:
+ std::vector<std::thread> v_;
+ uint8_t numPriorities_ = 1;
+ bool throwsOnAdd_ = false;
+ };
+
+ struct MyRequestData : RequestData {
+ MyRequestData(bool value = false) : value(value) {}
+ bool value;
+ };
+
+ Promise<int> p1, p2;
+ NewThreadExecutor e;
+ {
+ folly::RequestContextScopeGuard rctx;
+ RequestContext::get()->setContextData(
+ "key", std::make_unique<MyRequestData>(true));
+ auto checker = [](int lineno) {
+ return [lineno](Try<int>&& /* t */) {
+ auto d = static_cast<MyRequestData*>(
+ RequestContext::get()->getContextData("key"));
+ EXPECT_TRUE(d && d->value) << "on line " << lineno;
+ };
+ };
+
+ makeFuture(1).via(&e).then(checker(__LINE__));
+
+ e.setHandlesPriorities();
+ makeFuture(2).via(&e).then(checker(__LINE__));
+
+ p1.getFuture().then(checker(__LINE__));
+
+ e.setThrowsOnAdd();
+ p2.getFuture().via(&e).then(checker(__LINE__));
+ }
+ // Assert that no RequestContext is set
+ EXPECT_FALSE(RequestContext::saveContext());
+ p1.setValue(3);
+ p2.setValue(4);
+}
+
+TEST(Future, makeFutureNoThrow) {
+ makeFuture().value();
+}
+
+TEST(Future, invokeCallbackReturningValueAsRvalue) {
+ struct Foo {
+ int operator()(int x) & {
+ return x + 1;
+ }
+ int operator()(int x) const& {
+ return x + 2;
+ }
+ int operator()(int x) && {
+ return x + 3;
+ }
+ };
+
+ Foo foo;
+ Foo const cfoo;
+
+ // The callback will be copied when given as lvalue or const ref, and moved
+ // if provided as rvalue. Either way, it should be executed as rvalue.
+ EXPECT_EQ(103, makeFuture<int>(100).then(foo).value());
+ EXPECT_EQ(203, makeFuture<int>(200).then(cfoo).value());
+ EXPECT_EQ(303, makeFuture<int>(300).then(Foo()).value());
+}
+
+TEST(Future, invokeCallbackReturningFutureAsRvalue) {
+ struct Foo {
+ Future<int> operator()(int x) & {
+ return x + 1;
+ }
+ Future<int> operator()(int x) const& {
+ return x + 2;
+ }
+ Future<int> operator()(int x) && {
+ return x + 3;
+ }
+ };
+
+ Foo foo;
+ Foo const cfoo;
+
+ // The callback will be copied when given as lvalue or const ref, and moved
+ // if provided as rvalue. Either way, it should be executed as rvalue.
+ EXPECT_EQ(103, makeFuture<int>(100).then(foo).value());
+ EXPECT_EQ(203, makeFuture<int>(200).then(cfoo).value());
+ EXPECT_EQ(303, makeFuture<int>(300).then(Foo()).value());
}
projects / folly.git / blobdiff