RxJava - Trampoline 调度程序

Schedulers.trampoline() 方法创建一个并返回一个调度程序，将工作排队在当前线程上，待当前工作完成后执行。

Schedulers.trampoline() 示例

使用任意编辑器（如 C:\> RxJava）创建以下 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.trampoline()))
         .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 编译器编译该类，如下所示 −

C:\RxJava>javac ObservableTester.java

现在运行 ObservableTester，如下所示 −

C:\RxJava>java ObservableTester

它应生成以下输出 −

Processing Thread main
Receiver Thread main, Item length 1
Processing Thread main
Receiver Thread main, Item length 2
Processing Thread main
Receiver Thread main, Item length 3