# 订阅24h功耗器件分解统计事件（ArkTS）

#### 接口说明

API接口的具体使用说明（参数使用限制、具体取值范围等）请参考@ohos.hiviewdfx.hiAppEvent (应用事件打点)ArkTS API文档。

| 接口名 | 描述 |
| --- | --- |
| addWatcher(watcher: Watcher): AppEventPackageHolder | 添加应用事件观察者，以添加对应用事件的订阅。 |
| removeWatcher(watcher: Watcher): void | 移除应用事件观察者，以移除对应用事件的订阅。 |

#### 开发步骤

以实现对应用内多线程执行耗时操作生成的24h功耗器件分解统计事件订阅为例，说明开发步骤。

1.  编辑工程中的“entry > src > main > ets > entryability > EntryAbility.ets”文件，在onCreate函数中添加系统事件的订阅，示例代码如下：
    
    ```
    import { hiAppEvent, hilog } from '@kit.PerformanceAnalysisKit';
    
    hiAppEvent.addWatcher({
       // 开发者可以自定义观察者名称，系统会使用名称来标识不同的观察者
       name: "watcher",
       // 开发者可以订阅感兴趣的系统事件，此处是订阅了应用24h功耗器件分解统计事件
       appEventFilters: [
         {
           domain: hiAppEvent.domain.OS,
           names: [hiAppEvent.event.BATTERY_USAGE]
         }
       ],
       // 开发者可以自行实现订阅实时回调函数，以便对订阅获取到的事件数据进行自定义处理
       onReceive: (domain: string, appEventGroups: Array<hiAppEvent.AppEventGroup>) => {
         hilog.info(0x0000, 'testTag', `HiAppEvent onReceive: domain=${domain}`);
         for (const eventGroup of appEventGroups) {
           // 开发者可以根据事件集合中的事件名称区分不同的系统事件
           hilog.info(0x0000, 'testTag', `HiAppEvent eventName=${eventGroup.name}`);
           for (const eventInfo of eventGroup.appEventInfos) {
             // 开发者可以对事件集合中的事件数据进行自定义处理，此处是将事件数据打印在日志中
             hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo=${JSON.stringify(eventInfo)}`);
           }
         }
       }
     });
    ```
    
2.  工程中构造高耗电测试场景，并进行相关测试，使设备产生实际耗电，演示示例如下：
    
    开发者自测试可跳过此步骤，仅需完成应用安装后并断开充电（充电状态下测试会导致无数据上报），使用应用5分钟以上。
    
    1）工程中添加“entry > src > main > ets > workers> worker.ets”文件，构造一个死循环，接收到主线程的消息后触发CPU高负载事件，完整示例代码如下
    
    ```
    import { worker } from '@kit.ArkTS';
    
    let workerPort = worker.workerPort;
    workerPort.onmessage = (message) => {
      eatCpu();
    }
    function eatCpu(): void {
      let val:number = 0;
      while (true) {
        val++;
      }
    }
    ```
    
    2）工程中添加“entry > src > main > ets > tester> CpuTester.ets”文件，在CpuTester 类中的start方法中开启多个线程的死循环，以触发多线程的CPU高负载事件，完整示例代码如下：
    
    ```
    import { worker } from '@kit.ArkTS';
    
    export default class CpuTester {
      workerInstance: worker.ThreadWorker = new worker.ThreadWorker('entry/ets/workers/worker.ets');
      start(threadNum: number) {
        for (let index = 0; index < threadNum; index++) {
          this.workerInstance = new worker.ThreadWorker('entry/ets/workers/worker.ets');
          this.workerInstance.postMessage('msg');
        }
      }
    }
    ```
    
    3）编辑工程中的“entry > src > main > ets > pages > Index.ets”文件，添加“CPU加压”按钮并在其onClick函数构造多线程执行死循环，以触发CPU高负载事件，完整示例代码如下：
    
    ```
    import CpuTester from '../tester/CpuTester';
    
    @Entry
    @Component
    struct Index {
      @State message: string = 'Hello World';
    
      @State enable: boolean = true;
    
      @State threadNum: number = 5;
    
      cpuTester: CpuTester = new CpuTester();
    
    build() {
      Row() {
        Column() {
          Text(this.message)
            .fontSize(50)
            .fontWeight(FontWeight.Bold)
          Button('CPU加压')
            .fontSize(18)
            .margin(12)
            .fontWeight(FontWeight.Bold)
            .enabled(this.enable)
            .onClick(() => {
              this.cpuTester.start(this.threadNum);
              this.enable = false;
              })
          }
          .width('100%')
        }
        .height('100%')
      }
    }
    ```
    
    4）安装运行测试应用到测试机上，断开USB（2in1设备还需要断开充电线）；
    
    5）打开测试应用，然后在应用界面中点击“CPU加压”按钮，持续十分钟，测试过程保持屏幕常亮。
    
3.  测试完成后连接USB，0点后在Log窗口看到对系统事件数据的处理日志（快速触发上报方式：执行命令hdc shell hidumper -s 1213 -a '--test 1'，进入测试模式不进行时间跳变的校验，然后修改设备时间为下午的11点58分）：
    
    ```
    HiAppEvent onReceive: domain=OS
    HiAppEvent eventName=BATTERY_USAGE
    HiAppEvent eventInfo={"domain":"OS","name":"BATTERY_USAGE","eventType":2,"params":{"audio_background_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"audio_foreground_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"background_usage":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"begin_time":1709654400000,"bundle_name":"com.example.myapplication","bundle_version":"1.0.0","cpu_background_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"cpu_foreground_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,125647],"ddr_background_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"ddr_foreground_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,207],"gps_background_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"gps_foreground_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"sensor_background_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"sensor_foreground_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"display_background_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"display_foreground_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,8606],"end_time":1709740800000,"foreground_usage":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,67766],"gpu_background_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"gpu_foreground_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,48],"modem_background_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"modem_foreground_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"others_background_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"others_foreground_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1170],"rom_background_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"rom_foreground_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"time":1709740801326,"wifi_background_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"wifi_foreground_energy":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]}}
    ```