在 0.18 中，后台任务如何在调度程序上执行?

本文介绍了在 0.18 中，后台任务如何在调度程序上执行?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

感觉我在这里遗漏了一些东西，但我曾经做过的地方:

Feels like I'm missing something here, but where I used to do:

Schedulers.io().schedule(new Action1<Scheduler.Inner>() { @Override public void call(Scheduler.Inner inner) { doWhatever(); } });

我似乎无法再简单地使用调度程序来运行后台任务，而无需管理取消订阅 (github/Netflix/RxJava/wiki/Scheduler 和 github/Netflix/RxJava/blob/master/rxjava-core/src/main/java/rx/Scheduler.java).

I don't seem to be able to simply use a scheduler to run a background task anymore, without managing unsubscribes (github/Netflix/RxJava/wiki/Scheduler and github/Netflix/RxJava/blob/master/rxjava-core/src/main/java/rx/Scheduler.java).

0.18 是否有一种模式可以让我轻松地运行 doWhatever，而无需跟踪工作人员、取消订阅等?

Is there a pattern for 0.18 that allows me to run doWhatever easily, without keeping track of workers, unsubscribing, etc?

似乎你可以这样做:

final Worker worker = Schedulers.io().createWorker(); worker.schedule(new Action0() { @Override public void call() { doWhatever(); worker.unsubscribe(); } });

但这似乎需要做更多的工作(尤其是对于 android.mainThread 调度程序).

but this seems like a lot more work, (especially for the android.mainThread scheduler).

我在这里错过了什么?

推荐答案

在 Observable 中使用调度器

如果您使用的是 RxJava，我认为您应该让 Observables 处理调度程序.在我的代码中，我不认为我必须创建自己的工人并对其进行管理.

Using Scheduler with Observable

If you are using RxJava, I think you should let Observables deal with the Schedulers. In my code I don't think I ever had to create my own worker and mange it.

将 Observable 与 Scheduler 结合使用并在两种线程类型之间切换的示例.

Example of using Observable with Scheduler and switching between two thread types.

public void doSomething() { Observable .create(new Observable.OnSubscribe<Boolean>() { @Override public void call(Subscriber<? super Void> subscriber) { int sleepTime = (int) (Math.random() * 10000); System.out.println("Running on: " + Thread.currentThread().getId() + " sleep: " + sleepTime); try { Thread.sleep(sleepTime); } catch (InterruptedException e) { System.out.println("Error!!! " + Thread.currentThread().getId()); subscriber.onError(e); return; } System.out.println("Done!!! " + Thread.currentThread().getId()); subscriber.onNext(true); subscriber.onCompleted(); } }) // this will schedule your work in a background io thread. In this example the "call" method above. .subscribeOn(Schedulers.io()) // this will schedule your next/complete/error on the androids main thread. .observeOn(AndroidSchedulers.mainThread()) // kick off the actual work. .subscribe(new Subscriber<Boolean>() { @Override public void onCompleted() { // runs in main thread. } @Override public void onError(Throwable e) { // runs in main thread. } @Override public void onNext(Boolean result) { // runs in main thread. } }); }

直接使用调度程序

但是，我知道可能存在需要您直接使用调度程序的情况.所以，如果你想直接使用Scheduler.我认为以下内容符合您的要求.

Using Scheduler Directly

However, I do understand that there might be a case requiring you to use the scheduler directly. So, if you want to use the Scheduler directly. I think the following fits what you are looking for.

使用 runAction 创建调度程序实用程序.

Create a scheduler utility with a runAction.

public static void runAction(Action0 action, Scheduler scheduler) { Scheduler.Worker worker = scheduler.createWorker(); worker.schedule(new Action0() { @Override public void call() { action.call(); worker.unsubscribe(); } }); }

然后要使用它，传递一个要执行的操作和要使用的调度程序.

Then to use it, pass an action to execute and the scheduler to use.

SchedulerUtil.runAction(new Action0() { @Override public void call() { int sleepTime = (int) (Math.random() * 10000); System.out.println("Running on: " + Thread.currentThread().getId() + " sleep: " + sleepTime); try { Thread.sleep(sleepTime); } catch (InterruptedException ignored) { } System.out.println("Done!!! " + Thread.currentThread().getId()); } }, Schedulers.io());