#鸿蒙通关秘籍#鸿蒙系统如何提高I/O密集型任务的执行效率？

为提升鸿蒙系统中的I/O密集型任务处理效率，可以遵循以下步骤进行开发：

1. 创建一个负责文件写操作的函数。

typescript import { fileIo } from '@kit.CoreFileKit'

export async function write(data: string, filePath: string): Promise<void> { let file = await fileIo.open(filePath, fileIo.OpenMode.READ_WRITE | fileIo.OpenMode.CREATE); await fileIo.write(file.fd, data); fileIo.close(file); }

2. 并发地进行文件操作，加速写入速度。

typescript import { write } from './write'; import { BusinessError } from '@kit.BasicServicesKit'; import { taskpool } from '@kit.ArkTS'; import { common } from '@kit.AbilityKit';

@Concurrent async function concurrentTest(fileList: string[]): Promise<boolean> { for (let i = 0; i < fileList.length; i++) { write('Hello World!', fileList[i]) .then(() => console.info(Succeeded in writing the file. FileList: ${fileList[i]})) .catch((err: BusinessError) => { console.error(Failed to write the file. Code is ${err.code}, message is ${err.message}); return false; }); } return true; }

3. 通过 TaskPool 调度并执行并发函数。

typescript let context = getContext() as common.UIAbilityContext; let filePath1 = context.filesDir + "/path1.txt"; let filePath2 = context.filesDir + "/path2.txt";

taskpool.execute(concurrentTest, [filePath1, filePath2]) .then(() => console.info("taskpool: execute success"));