RxJava - Trampoline 排程程式

Schedulers.trampoline() 方法建立一個並返回一個排程程式，將工作排隊在當前執行緒上，待當前工作完成後執行。

Schedulers.trampoline() 示例

使用任意編輯器（如 C:\> RxJava）建立以下 Java 程式。

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;
   }
}

驗證結果

使用 javac 編譯器編譯該類，如下所示 −

C:\RxJava>javac ObservableTester.java

現在執行 ObservableTester，如下所示 −

C:\RxJava>java ObservableTester

它應生成以下輸出 −

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