ArkTS多线程下使用单例会创建多份实例

增加一个按钮在主线程调用单例的incrementCount增加，在taskpool中执行单例的fetchCount获取count

异常情况：单例会被创建多次，在主线程的单例count增加不会同步到taskpool执行线程中的count，应该是创建了多份实例；使用共享模块中的use shared声明也不生效

https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/arkts-sendable-module-V5

“use shared”

// 导出sendable对象 
export { SingleConfig } 
 
 
@Sendable 
class SingleConfig { 
  private static instance: SingleConfig; 
  private count: number = 0; 
 
  public static getInstance(): SingleConfig { 
    if (SingleConfig.instance == undefined) { 
      SingleConfig.instance = new SingleConfig(); 
    } 
    return SingleConfig.instance; 
  } 
 
  public fetchCount(): number { 
    return this.count; 
  } 
 
  public incrementCount() { 
    this.count = this.count + 1; 
  } 
}

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2024-08-03 11:10:03

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回答 1

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回答 1

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南风春和

单例传到taskpool

let sig = SingleConfig.getInstance(); 
@Concurrent 
async function test2(sig: SingleConfig){ 
  console.log("test: taskpool count is:"+sig.fetchCount()); 
} 
@Entry 
@Component 
struct Index { 
  @State message: string = 'Hello World'; 
 
  build() { 
    Row() { 
      Column() { 
        Text(this.message) 
          .fontSize(50) 
          .fontWeight(FontWeight.Bold) 
          .onClick(() => { 
            sig.incrementCount(); 
            console.info('lllll:main thread count is:'+sig.fetchCount()); 
            //hilog.info(0x0000, 'testTag', 'Test NAPI 2 + 3 = %{public}d', testNapi.add(2, 3)); 
 
          }) 
        Button("test1") 
          .onClick(async ()=>{ 
            let task = new taskpool.Task(test2, sig); 
            await taskpool.execute(task); 
          }) 
      } 
      .width('100%') 
    } 
    .height('100%') 
  } 
}