RxJava from调度器|极客教程

RxJava from调度器

Schedulers.from(Executor) 方法将一个 Executor 转换为一个新的 Scheduler 实例。

Schedulers.from(Executor) 示例

使用您选择的任何编辑器，在 C:> RxJava 中创建以下 Java 程序。

ObservableTester.java

import java.util.Random;
import java.util.concurrent.Executors;

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.from(Executors.newFixedThreadPool(3))))
         .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 编译器编译类，如下所示−

C:\RxJava>javac ObservableTester.java

现在按照以下方式运行ObservableTester-

C:\RxJava>java ObservableTester

它应该产生以下输出：

Processing Thread pool-1-thread-1
Processing Thread pool-3-thread-1
Receiver Thread pool-1-thread-1, Item length 1
Processing Thread pool-4-thread-1
Receiver Thread pool-4-thread-1, Item length 3
Receiver Thread pool-3-thread-1, Item length 2