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1/*
2 * Copyright (c) 2023 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
16import backgroundTaskManager from '@ohos.resourceschedule.backgroundTaskManager';
17import { BusinessError } from '@ohos.base';
18import util from '@ohos.util';
19import hiTraceMeter from '@ohos.hiTraceMeter';
20import taskpool from '@ohos.taskpool';
21
22const totalTimes: number = 50000000; // 循环次数
23const calculateResult: string = 'Total time costed = %s ms.'; //  文本格式
24
25@Component
26export struct TransientTaskView {
27  @State message: string = 'Click button to calculate.';
28  private requestId: number = 0;
29
30  // 申请短时任务
31  requestSuspendDelay() {
32    try {
33      let delayInfo = backgroundTaskManager.requestSuspendDelay('compute', () => {
34        console.info('Request suspension delay will time out.');
35        // 任务即将超时，取消短时任务
36        this.cancelSuspendDelay();
37      })
38      this.requestId = delayInfo.requestId;
39    } catch (error) {
40      console.error(`requestSuspendDelay failed. message is ${(error as BusinessError).message}`);
41    }
42  }
43
44  // 取消短时任务
45  cancelSuspendDelay() {
46    backgroundTaskManager.cancelSuspendDelay(this.requestId);
47    console.info('Request suspension delay cancel.');
48  }
49
50  // 点击回调
51  clickCallback = () => {
52    this.requestSuspendDelay();
53    this.message = 'calculating';
54    hiTraceMeter.startTrace('computerTask', 0);
55    let task: taskpool.Task = new taskpool.Task(computeTask, totalTimes);
56    taskpool.execute(task, taskpool.Priority.HIGH).then((res: Object) => {
57      this.message = util.format(calculateResult, res.toString());
58      hiTraceMeter.finishTrace('computerTask', 0);
59      this.cancelSuspendDelay();
60    })
61  }
62
63  build() {
64    Column() {
65      Row() {
66        Text(this.message)
67      }
68
69      Row() {
70        Button('开始计算')
71          .onClick(this.clickCallback)
72      }
73      .width('100%')
74      .justifyContent(FlexAlign.Center)
75    }
76    .width('100%')
77    .height('100%')
78    .justifyContent(FlexAlign.Center)
79  }
80}
81
82// 计算任务
83@Concurrent
84function computeTask(times: number): number {
85  let start: number = new Date().getTime();
86  let a: number = 1;
87  let b: number = 1;
88  let c: number = 1;
89
90  for (let i: number = 0; i < times; i++) {
91    a = a * Math.random() + b * Math.random() + c * Math.random();
92    b = a * Math.random() + b * Math.random() + c * Math.random();
93    c = a * Math.random() + b * Math.random() + c * Math.random();
94  }
95  let end: number = new Date().getTime();
96  return end - start;
97}