RxJava - 计算调度器

Schedulers.computation() 方法创建并返回一个旨在进行计算工作的调度器。要调度的线程数取决于系统中存在的 CPU。每个 CPU 允许一个线程。最适合用于事件循环或回调操作。

Schedulers.computation() 示例

在你的选择中使用任何编辑器（例如 C:\> RxJava）创建一个以下 Java 程序。

ObservableTester.java

import java.util.Random;

import io.reactivex.Observable;
import io.reactivex.schedulers.Schedulers;

public class ObservableTester  {
   public static void main(String[] args) throws InterruptedException {
      Observable.just("A", "AB", "ABC")
         .flatMap(v -> getLengthWithDelay(v)
         .doOnNext(s -> System.out.println("Processing Thread " 
            + Thread.currentThread().getName()))
         .subscribeOn(Schedulers.computation()))
         .subscribe(length -> System.out.println("Receiver Thread " 
            + Thread.currentThread().getName() 
            + ", Item length " + length));

         Thread.sleep(10000);
   }
   protected static Observable<Integer> getLengthWithDelay(String v) {
      Random random = new Random();
      try {
         Thread.sleep(random.nextInt(3) * 1000);
         return Observable.just(v.length());
      } catch (InterruptedException e) {
         e.printStackTrace();
      }
      return null;
   }
}

验证结果

使用 **javac** 编译器编译如下类：

C:\RxJava>javac ObservableTester.java

现在，如下运行 ObservableTester：

C:\RxJava>java ObservableTester

应当生成以下输出：

Processing Thread RxComputationThreadPool-1
Receiver Thread RxComputationThreadPool-1, Item length 1
Processing Thread RxComputationThreadPool-2
Receiver Thread RxComputationThreadPool-2, Item length 2
Processing Thread RxComputationThreadPool-3
Receiver Thread RxComputationThreadPool-3, Item length 3