1/*
2 * Copyright (c) 2021 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16#ifndef PASTEBOARD_SP_SINGLETON_H
17#define PASTEBOARD_SP_SINGLETON_H
18
19#include <memory>
20#include <mutex>
21#include <refbase.h>
22
23#include "nocopyable.h"
24
25namespace OHOS {
26namespace MiscServices {
27#define DECLARE_DELAYED_SP_SINGLETON(MyClass) \
28public:                                       \
29    ~MyClass();                               \
30                                              \
31private:                                      \
32    friend DelayedSpSingleton<MyClass>;       \
33    MyClass();
34
35template<typename T>
36class DelayedSpSingleton : public NoCopyable {
37public:
38    static sptr<T> GetInstance();
39    static void DestroyInstance();
40
41private:
42    static sptr<T> instance_;
43    static std::mutex mutex_;
44};
45
46template<typename T>
47sptr<T> DelayedSpSingleton<T>::instance_ = nullptr;
48
49template<typename T>
50std::mutex DelayedSpSingleton<T>::mutex_;
51
52template<typename T>
53sptr<T> DelayedSpSingleton<T>::GetInstance()
54{
55    if (!instance_) {
56        std::lock_guard<std::mutex> lock(mutex_);
57        if (instance_ == nullptr) {
58            instance_ = new T();
59        }
60    }
61
62    return instance_;
63}
64
65template<typename T>
66void DelayedSpSingleton<T>::DestroyInstance()
67{
68    std::lock_guard<std::mutex> lock(mutex_);
69    if (instance_) {
70        instance_.clear();
71        instance_ = nullptr;
72    }
73}
74} // namespace MiscServices
75} // namespace OHOS
76#endif
77