HarmonyOS 鸿蒙Next worker.ts中如何获取context

发布于 1周前 作者 yuanlaile 来自 鸿蒙OS

HarmonyOS 鸿蒙Next worker.ts中如何获取context
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Harmonyos Next教程
4 回复
  1. 从主线程通过worker.postMessage（context）发送到worker子线程。
let worker = new worker.ThreadWorker('entry/ets/workers/Worker.ts', {name:"first worker in Stage model"});

let context = getContext(this)


worker.postMessage(context);<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>
  1. 从worker线程中通过workerPort.onmessage接受context。
workerPort.onmessage = function(e : MessageEvents) {


    let context = e.data


    console.info(${TAG} onmessage:${<span class="hljs-built_in"><span class="hljs-built_in">JSON</span></span>.stringify(context.cacheDir)})


}<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>

升级HarmonyOS后，感觉手机的整体性能都有了很大的提升。

作者试过了吗，两个context一样吗，因为worker.postMessage(object);其中要求object中的内容可以序列化，而context显然不行

楼主这方法不太好，建议如下写法

export default class GlobalThis {
  private constructor() {};
  private static instance: GlobalThis;
  private _uiContexts = new Map<string, common.UIAbilityContext>();
  private _appContexts = new Map<string, Context>();
  static readonly ConttextKey="globalContext";
  static readonly AppConttextKey="appContext";

public static getInstance(): GlobalThis {
if (!GlobalThis.instance) {
GlobalThis.instance = new GlobalThis();
}
return GlobalThis.instance;
}
setApplicationContext(appContent:Context){
this._appContexts.set(GlobalThis.AppConttextKey,appContent);
}
getApplicationContext():Context | undefined {
return this._appContexts.get(GlobalThis.AppConttextKey);
}
setContext(key: string, value: common.UIAbilityContext): void {
this._uiContexts.set(key, value);
}
getContext(key: string): common.UIAbilityContext | undefined {
return this._uiContexts.get(key);
}
setWorker(key:string,worker:worker.ThreadWorker){
this._workers.set(key,worker);
}
}
<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>

然后程序启动的时候保存context

export default class EntryAbility extends UIAbility{


onCreate(want: Want, launchParam: AbilityConstant.LaunchParam) {
let globalThis=GlobalThis.getInstance();
let mainAbilityContext = this.context.getApplicationContext();
globalThis.setApplicationContext(mainAbilityContext);
}<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>

使用方法

let globalThis=GlobalThis.getInstance();
let pathDir = globalThis.getApplicationContext().filesDir;
}<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>

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