1/*
2 * Copyright 2015-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 <memory>
18#include <vector>
19
20#include <folly/Benchmark.h>
21#include <folly/Singleton.h>
22#include <folly/portability/GTest.h>
23#include <folly/test/SingletonTestStructs.h>
24
25/*
26 * This test needs to be in its own file, as a standalone program.
27 * We want to ensure no other singletons are registered, so we can
28 * rely on some expectations about registered and living counts, etc.
29 * All other tests should go in `SingletonTest.cpp`.
30 */
31
32using namespace folly;
33
34namespace {
35Singleton<GlobalWatchdog> global_watchdog;
36} // namespace
37
38// Test basic global usage (the default way singletons will generally
39// be used).
40TEST(Singleton, BasicGlobalUsage) {
41 EXPECT_EQ(Watchdog::creation_order().size(), 0);
42 EXPECT_GE(SingletonVault::singleton()->registeredSingletonCount(), 1);
43 EXPECT_EQ(SingletonVault::singleton()->livingSingletonCount(), 0);
44
45 {
46 std::shared_ptr<GlobalWatchdog> wd1 = Singleton<GlobalWatchdog>::try_get();
47 EXPECT_NE(wd1, nullptr);
48 EXPECT_EQ(Watchdog::creation_order().size(), 1);
49 std::shared_ptr<GlobalWatchdog> wd2 = Singleton<GlobalWatchdog>::try_get();
50 EXPECT_NE(wd2, nullptr);
51 EXPECT_EQ(wd1.get(), wd2.get());
52 EXPECT_EQ(Watchdog::creation_order().size(), 1);
53 }
54
55 SingletonVault::singleton()->destroyInstances();
56 EXPECT_EQ(Watchdog::creation_order().size(), 0);
57}
58