1 /*
2  * Copyright (c) 2022 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 OHOS_ABILITY_ABILITY_TRANSACTION_CALLBACK_INFO_H
17 #define OHOS_ABILITY_ABILITY_TRANSACTION_CALLBACK_INFO_H
18 
19 #include <memory>
20 #include <stack>
21 
22 namespace OHOS {
23 namespace AppExecFwk {
24 template<typename T = void>
25 class AbilityTransactionCallbackInfo {
26 public:
27     using CallbackFunc = std::function<void(T&)>;
28 
29     AbilityTransactionCallbackInfo() = default;
30     ~AbilityTransactionCallbackInfo() = default;
31 
Create()32     static AbilityTransactionCallbackInfo *Create()
33     {
34         return new(std::nothrow) AbilityTransactionCallbackInfo();
35     }
36 
Destroy(AbilityTransactionCallbackInfo * callbackInfo)37     static void Destroy(AbilityTransactionCallbackInfo *callbackInfo)
38     {
39         delete callbackInfo;
40     }
41 
Push(const CallbackFunc & callback)42     void Push(const CallbackFunc &callback)
43     {
44         callbackStack_.push(callback);
45     }
46 
Call(T & callbackResult)47     void Call(T &callbackResult)
48     {
49         while (!callbackStack_.empty()) {
50             CallbackFunc &callbackFunc = callbackStack_.top();
51             callbackFunc(callbackResult);
52             callbackStack_.pop();
53         }
54     }
55 
IsEmpty()56     bool IsEmpty() const
57     {
58         return callbackStack_.empty();
59     }
60 
61 private:
62     std::stack<CallbackFunc> callbackStack_ {};
63 };
64 
65 template<>
66 class AbilityTransactionCallbackInfo<void> {
67 public:
68     using CallbackFunc = std::function<void()>;
69 
70     AbilityTransactionCallbackInfo() = default;
71     ~AbilityTransactionCallbackInfo() = default;
72 
Create()73     static AbilityTransactionCallbackInfo *Create()
74     {
75         return new(std::nothrow) AbilityTransactionCallbackInfo();
76     }
77 
Destroy(AbilityTransactionCallbackInfo * callbackInfo)78     static void Destroy(AbilityTransactionCallbackInfo *callbackInfo)
79     {
80         delete callbackInfo;
81     }
82 
Push(const CallbackFunc & callback)83     void Push(const CallbackFunc &callback)
84     {
85         callbackStack_.push(callback);
86     }
87 
Call()88     void Call()
89     {
90         while (!callbackStack_.empty()) {
91             CallbackFunc &callbackFunc = callbackStack_.top();
92             callbackFunc();
93             callbackStack_.pop();
94         }
95     }
96 
IsEmpty()97     bool IsEmpty() const
98     {
99         return callbackStack_.empty();
100     }
101 
102 private:
103     std::stack<CallbackFunc> callbackStack_ {};
104 };
105 }  // namespace AppExecFwk
106 }  // namespace OHOS
107 #endif // OHOS_ABILITY_ABILITY_TRANSACTION_CALLBACK_INFO_H
108