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_MEMORY_MEMMGR_LOW_MEMORY_KILLER_H
17 #define OHOS_MEMORY_MEMMGR_LOW_MEMORY_KILLER_H
18 
19 #include "event_handler.h"
20 #include "single_instance.h"
21 
22 namespace OHOS {
23 namespace Memory {
24 class  LowMemoryKiller {
25     DECLARE_SINGLE_INSTANCE_BASE(LowMemoryKiller);
26 
27 public:
28     void PsiHandler();
29     int32_t GetKillLevel();
30 private:
31     LowMemoryKiller();
32     ~LowMemoryKiller() = default;
33     std::pair<unsigned int, int> QueryKillMemoryPriorityPair(unsigned int currBufferKB,
34             unsigned int &targetBufKB, int &killLevel);
35     void PsiHandlerInner();
36     int KillOneBundleByPrio(int minPrio);
37     bool GetEventHandler();
38     std::shared_ptr<AppExecFwk::EventHandler> handler_;
39 
40     bool initialized_ = false;
41     long calledCount_ = 0;
42     int32_t killLevel_ = 0;
43 };
44 } // namespace Memory
45 } // namespace OHOS
46 #endif // OHOS_MEMORY_MEMMGR_LOW_MEMORY_KILLER_H
47