如何实现跨线程数据共享

如何实现跨线程数据共享。

HarmonyOS

superinsect

2024-09-18 12:24:57

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zbw_apple

从API 11开始，ArkTs支持使用@Sendable，可以使用@Sendable创建共享模块来实现跨线程数据共享，参考链接：Sendable，共享模块。

参考代码：

// 共享模块sharedModule.ets 
import { ArkTSUtils } from '@kit.ArkTS'; 
 
// 声明当前模块为共享模块，只能导出可Sendable数据 
"use shared" 
 
// 共享模块，SingletonA全局唯一 
@Sendable 
class SingletonA { 
  private count_: number = 0; 
  lock_: ArkTSUtils.locks.AsyncLock = new ArkTSUtils.locks.AsyncLock() 
  public async getCount(): Promise<number> { 
    return this.lock_.lockAsync(() => { 
      return this.count_; 
    }) 
  } 
  public async increaseCount() { 
    await this.lock_.lockAsync(() => { 
      this.count_++; 
    }) 
  } 
} 
 
export let singletonA = new SingletonA();
import { taskpool } from '@kit.ArkTS'; 
import { singletonA } from './sharedModule' 
 
@Concurrent 
async function increaseCount() { 
  await singletonA.increaseCount(); 
  console.info("SharedModule: count is:" + await singletonA.getCount()); 
} 
 
@Concurrent 
async function printCount() { 
  console.info("SharedModule: count is:" + await singletonA.getCount()); 
} 
 
@Entry 
@Component 
struct Index { 
  build() { 
    Row() { 
      Column() { 
        Button("MainThread print count") 
          .onClick(async () => { 
            await printCount() 
          }) 
        Button("Taskpool print count") 
          .onClick(async () => { 
            await taskpool.execute(printCount); 
          }) 
        Button("MainThread increase count") 
          .onClick(async () => { 
            await increaseCount() 
          }) 
        Button("Taskpool increase count") 
          .onClick(async () => { 
            await taskpool.execute(increaseCount); 
          }) 
      } 
      .width('100%') 
    } 
    .height('100%') 
  } 
}