OpenHarmony Stage Worker 多线程

import worker from '@ohos.worker';
private workerInstance: worker.ThreadWorkerprivate readonly scriptURL: string = 'entry/ets/worker/worker.ts'
aboutToAppear() {
    //  主线程中创建Worker对象
    this.workerInstance = new worker.ThreadWorker(this.scriptURL, {
      name: 'worker_thread'
    })
    // 注册监听器
    // 具体宿主线程发送的信息
    this.workerInstance.onmessage = function(e){
      let data = e.data
      console.info(`${TAG} workerInstance.onmessage ${data}`)
      this.result = data
      this.showSaveToast()
    }.bind(this)
    this.workerInstance.onexit = function () {
      console.info(`${TAG}  workerInstance onexit`)
    }
  }  
  showSaveToast() {
  // 数据保存成功
  promptAction.showToast({
    message: '数据保存成功',
    duration: 2000
  })
}

import worker from '@ohos.worker';
import { MyMessage } from '../modele/MyMessage'
import { MessageType } from '../modele/MessageType'
import fileIo from '@ohos.file.fs'
const TAG: string = '[worker]'
// 创建worker线程中与主线程通信的对象
const workerPort = worker.workerPort
let fd: number = 0
// worker线程接收主线程信息
workerPort.onmessage = function (e) {
    // data:主线程发送的消息
    let data = e.data as MyMessage
    console.info(`${TAG} workerPort.onmessage ${e}`)
    let type = data.type
    switch (type) {
        case MessageType.CLOSE: {
            // 关闭线程
            console.info(`${TAG} workerPort.onmessage close`)
            workerPort.close()
            break
        }
        case MessageType.SAVE: {
            console.info(`${TAG} workerPort.onmessage save path: ${data.path}}`)
            if (data.path) {
                // 保存数据到文件
                if (fd <= 0) {
                    fd = fileIo.openSync(data.path, 0o2 | 0o100).fd
                }
                for (var index = 0; index < 1000000; index++) {
                    fileIo.writeSync(fd, 'Worker Thread ' + data.data + '' + index + ' \n')
                }
            }
            // 向主线程发送消息
            workerPort.postMessage(data.data + ' 数据保存完成')
            break
        }
        default: {
            console.error(`${TAG} workerPort.onmessage message type error`)
        }
    }
}
// worker线程发生error的回调
workerPort.onerror = function (e) {
    console.info(`${TAG} workerPort.onerror ${JSON.stringify(e)}`)
}

"buildOption": {
    "sourceOption": {
      "workers": [
        "./src/main/ets/worker/worker.ts"
      ]
    }
  }

build() {
    Column() {
      Text(this.result)
        .fontSize(18)
        .fontWeight(FontWeight.Bold)
      Button('主线程保存数据')
        .width('50%')
        .height(50)
        .fontSize(24)
        .margin({
          top: 20,
          bottom: 20
        })
        .onClick(() => {
          this.showStartSaveToast()
          this.result = 'worker test..'
          let fd = fileIo.openSync(globalThis.getContext(this).filesDir + '/' + 'catch_log.txt', 0o2 | 0o100).fd
          for (var index = 0; index < 1000000; index++) {
            fileIo.writeSync(fd, 'UI Thread This write data' + index + ' \n')
          }
          this.result = 'worker test success'
          this.showSaveToast()
        })
      Button('子线程保存数据')
        .width('50%')
        .height(50)
        .fontSize(24)
        .margin({
          top: 20,
          bottom: 20
        })
        .onClick(() => {
          this.showStartSaveToast()
          this.result = 'worker test..'
          let oldData = 'This write data'
          let sendData: MyMessage = new MyMessage()
          sendData.type = MessageType.SAVE
          sendData.path = globalThis.getContext(this).filesDir + '/' + 'catch_log.txt'
          sendData.data = oldData
          this.sendMessage(sendData)
        })
      Button('UI')
        .width('50%')
        .height(50)
        .fontSize(24)
        .margin({
          top: 20,
          bottom: 20
        })
        .onClick(() => {
          promptAction.showToast({
            message: 'click UI',
            duration: 3000
          })
        })
    }
    .width('100%')
    .height('100%')
  }