OpenHarmony 应用如何使用@ohos.worker多线程进行批量文件读写与复制原创

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发布于 2024-1-23 10:14

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作者：苟晶晶

简介：

支持批量文件读写、复制等操作，支持使用@ohos.worker进行多线程开发。创先线程可以使用@ohos.worker

文档环境：

开发环境：Windows 11 家庭版
DevEco Studio版本：DevEco Studio 4.0 Release（4.0.0.600）
SDK版本：4.0.10.13
开发板型号：DAYU200(RK3568)
系统版本：OpenHarmony 4.1.5.2

演示 demo：

新建一个 Stage 框架的 demo 工程，在entryability/EntryAbility.ets中通过 let filesDir = this.context.filesDir;AppStorage.SetOrCreate(‘sanBoxFileDir’, filesDir);存储沙箱files路径信息，然后在pages/CopyFile.ets中通过public baseDir: string | undefined = AppStorage.Get(‘sanBoxFileDir’);拿到应用的沙箱files路径信息，通过文件操作接口在files下创建文件夹workerDir并创建以txt为后缀的文件。
通过接口fs.listFileSync(filesPathDir)获取workerDir文件夹下的所有文件并显示在list中。

用户点击多选框选择需要批量拷贝的文件，通过new worker.ThreadWorker(‘entry/ets/workers/WorkerCopy.ets’)创建worker线程并将拷贝文件的信息发送至worker线程，在该线程中通过fs.copyFileSync(srcPath, destPath)实现文件拷贝操作，文件拷贝成功之后向主线程发送拷贝成功消息：workerPort.postMessage({count: count,strFlag: true,listFileNames: listFileNames});

核心代码如下：

在沙箱路径下创建待拷贝的文件：

readyFilesToWorker(): void {
    let content = CONTENT + CONTENT + new Date() + '\n';
    let workerDir = this.baseDir + '/workerDir';

    try {
      if (!fs.accessSync(workerDir)) {
        fs.mkdirSync(workerDir);
      }
      Logger.info(TAG, 'readyFilesToWorker dpath = ' + workerDir);
      for (let i = 0; i < FILE_NUM; i++) {
        let myFile = '';
        if (i < FILE_NUMBER) {
          myFile = workerDir + `/TestFile0${i + 1}.txt`;
        } else {
          myFile = workerDir + `/TestFile${i + 1}.txt`;
        }
        Logger.info(TAG, 'readyFilesToWorker myFile = ' + myFile);
        let file = fs.openSync(myFile, fs.OpenMode.CREATE | fs.OpenMode.READ_WRITE);
        fs.writeSync(file.fd, content);
        fs.closeSync(file);
      }
      Logger.info(TAG, 'readyFilesToWorker successful');
    } catch (e) {
      Logger.error(TAG, `readyFilesToWorker has failed for: {message: ${(e as BusinessError).message}, code: ${(e as BusinessError).code}}`);
    }
  }
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创建worker线程并发送拷贝的文件信息：

async workToCopyFiles(files: Array<string>, filePath: string): Promise<void> {
    try {
      Logger.info(TAG, 'WorkCreator start to create worker');
      let destPath = filePath;
      Logger.info(TAG, 'Workerets destPath ' + destPath);
      if (!fs.accessSync(destPath)) {
        fs.mkdirSync(destPath);
      }
      if (fs.accessSync(destPath)) {
        fs.listFile(destPath).then((filenames) => {
          Logger.info(TAG, 'listFile succeed');
          for (let i = 0; i < filenames.length; i++) {
            Logger.info(TAG, 'Workerets fileName: ' + filenames[i]);
          }
        }).catch((err: BusinessError) => {
          Logger.info(TAG, 'list file failed with error message: ' + err.message + ', error code: ' + err.code);
        });
      }
      if (files !== null) {
        this.realFileNames.length = 0;
        for (let i = 0; i < files.length; i++) {
          if (files[i] === 'deletedTag') {
            continue;
          }
          this.realFileNames.push(files[i]);
        }
      }
      let count = this.realFileNames.length;
      for (let j = 0; j < count; j++) {
        Logger.info(TAG, 'workToCopyFiles this.realFileNames = ' + this.realFileNames[j]);
      }
      workerInstance = new worker.ThreadWorker('entry/ets/workers/WorkerCopy.ts');
      if (this.realFileNames !== null) {
        let srcPath = this.baseDir + '/workerDir';
        workerInstance.postMessage({
          srcDir: srcPath,
          destDir: destPath,
          fileNames: this.realFileNames
        });
      }

      workerInstance.onexit = (code): void => {
        Logger.info(TAG, `workerInstance::onexit has been exit ${code}`);
      };
      workerInstance.onerror = (err): void => {
        Logger.info(TAG, `workerInstance::onerror has errors: ${JSON.stringify(err)}`);
      };
      workerInstance.onmessageerror = (event): void => {
        Logger.info(TAG, `workerInstance::onmessageerror has errors: ${JSON.stringify(event)}`);
      };
      workerInstance.onmessage = (message): void => {
        Logger.info(TAG, `workerInstance::onmessage receive data: ${JSON.stringify(message.data)}`);
        if (message.data.hasOwnProperty('count')) {
          Logger.info(TAG, `workerInstance::onmessage receive data length = ${message.data.count}`);
          this.filesCount = message.data.count;
          fileFlag = message.data.strFlag;
          this.flag = true;
          let fileName1: string | null = null;
          let fileName2: string | null = null;
          for (let i: number = 0; i < message.data.listFileNames.length; i++) {
            Logger.info(TAG, `Worker workerInstance::onmessage receive listFileNames: ${message.data.listFileNames[i]}`);
          }
          if (message.data.listFileNames[0] !== undefined && message.data.listFileNames[1] !== undefined && message.data.listFileNames[LIST_FILE_TWO] === undefined) {
            fileName1 = message.data.listFileNames[0] + '、';
            fileName2 = message.data.listFileNames[1];
          } else if (message.data.listFileNames[0] !== undefined && message.data.listFileNames[1] === undefined) {
            fileName1 = message.data.listFileNames[0];
            fileName2 = '';
          } else {
            fileName1 = message.data.listFileNames[0] + '、';
            let copyFileLog: string | undefined = AppStorage.Get('copyFileLog5');
            fileName2 = message.data.listFileNames[1] + copyFileLog;
          }
          AppStorage.SetOrCreate('fileListName1', fileName1);
          AppStorage.SetOrCreate('fileListName2', fileName2);
          let copyFileLog3: string | undefined = AppStorage.Get('copyFileLog3');
          let copyFileLog4: string | undefined = AppStorage.Get('copyFileLog4');
          let copyFileLog = '2、' + fileName1 + fileName2 + copyFileLog3 + 'copy' + copyFileLog4;
          if (fileName1 !== 'undefined、') {
            AppStorage.SetOrCreate('copyFileShowLog', copyFileLog);
          } else {
            AppStorage.SetOrCreate('copyFileShowLog', $r('app.string.workerLogChooseFile'));
          }
          Logger.info(TAG, `Worker workerInstance::onmessage receive count: ${JSON.stringify(this.filesCount)}`);
        }
        if (this.filesCount !== 0) {
          AppStorage.SetOrCreate('fileNumber', JSON.stringify(this.filesCount));
        } else {
          AppStorage.SetOrCreate('fileNumber', '0');
          AppStorage.SetOrCreate('fileListName1', '');
          AppStorage.SetOrCreate('fileListName2', '');
        }
        Logger.info(TAG, 'workerInstance::onmessage Finish to process data from WorkerCopy.ts');
        workerInstance?.terminate();
      };
      while (!fileFlag) {
        await sleep(SLEEP_TIME);
      }
    } catch (e) {
      Logger.error(TAG, `Worker WorkCreator error package: message: ${(e as BusinessError).message}, code: ${(e as BusinessError).code}`);
    }
  }
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worker线程实现拷贝：

import worker from '@ohos.worker';
import type { ThreadWorkerGlobalScope } from '@ohos.worker';
import Logger from '../common/Logger';
import fs from '@ohos.file.fs';

const workerPort: ThreadWorkerGlobalScope = worker.workerPort;
const TAG: string = '[ConcurrentModule].[WorkerCopy]';

workerPort.onmessage = (message): void => {
  let srcPath: string = null;
  let destPath: string = null;
  let fileNames: string = message.data.fileNames;
  for (let i = 0; i < fileNames.length; i++) {
    srcPath = message.data.srcDir + '/' + fileNames[i];
    Logger.info(TAG, ' srcPath ' + srcPath);
    destPath = message.data.destDir + '/' + fileNames[i];
    Logger.info(TAG, ' destPath ' + destPath);
    try {
      fs.copyFileSync(srcPath, destPath);
      let countTest = fs.listFileSync(message.data.destDir).length;
      Logger.info(TAG, `Worker workerInstance::onmessage receive countTest: ${countTest}`);
    } catch (e) {
      Logger.error(TAG, 'WorkerCopy::copyFile has failed for: ' + JSON.stringify(e));
    }
  }
  let listFileNames = [];
  listFileNames.length = 0;
  try {
    let count = fs.listFileSync(message.data.destDir).length;
    let listFiles = fs.listFileSync(message.data.destDir);
    Logger.info(TAG, 'listFile succeed');
    for (let i = 0; i < listFiles.length; i++) {
      listFileNames[i] = listFiles[i];
      Logger.info(TAG, `Worker workerInstance::onmessage receive listFileNames: ${listFileNames[i]}`);
    }
    workerPort.postMessage({
      count: count,
      strFlag: true,
      listFileNames: listFileNames
    });
    Logger.info(TAG, 'WorkerCopy::onmessage thread post message successfully');
  } catch (e) {
    Logger.error(TAG, 'WorkerCopy::onmessage has failed for: ' + JSON.stringify(e));
  }
};

workerPort.onmessageerror = async (message): Promise<void> => {
  Logger.error(TAG, 'WorkerCopy::onmessageerror : ' + JSON.stringify(message));
};

workerPort.onerror = (e): void => {
  Logger.error(TAG, 'WorkerCopy::onerror : ' + JSON.stringify(e));
};
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分类

OpenHarmony

标签

OpenHarmony

51CTO

51CTO博客

51CTO学堂

OpenHarmony 应用如何使用@ohos.worker多线程进行批量文件读写与复制原创

简介：

文档环境：

演示 demo：

目录

订阅鸿蒙技术特刊，精选内容抢先看

51CTO

51CTO博客

51CTO学堂

OpenHarmony 应用如何使用@ohos.worker多线程进行批量文件读写与复制 原创

简介：

文档环境：

演示 demo：

目录

订阅鸿蒙技术特刊，精选内容抢先看

OpenHarmony 应用如何使用@ohos.worker多线程进行批量文件读写与复制原创