Rxjava 简明教程

RxJava - Buffering

缓存操作符允许将 Observable 发出的项目收集到列表或捆绑包中，并发出这些捆绑包，而不是项目。在下面的示例中，我们创建了一个 Observable 来发出 9 个项目，并使用缓存，一起发出 3 个项目。

Buffering operator allows to gather items emitted by an Observable into a list or bundles and emit those bundles instead of items. In the example below, we’ve created an Observable to emit 9 items and using buffering, 3 items will be emitted together.

Buffering Example

在任意编辑器中使用任何您选择的语言（如 C:\>RxJava) 创建以下 Java 程序。

Create the following Java program using any editor of your choice in, say, C:\> RxJava.

ObservableTester.java

import io.reactivex.Observable;
import io.reactivex.Observer;
import io.reactivex.disposables.Disposable;
import io.reactivex.schedulers.Schedulers;

import java.util.List;
import java.util.concurrent.TimeUnit;

public class ObservableTester {
   public static void main(String[] args) throws InterruptedException {
      Observable<Integer> observable = Observable.just(1, 2, 3, 4,
         5, 6, 7, 8, 9);

      observable.subscribeOn(Schedulers.io())
         .delay(2, TimeUnit.SECONDS, Schedulers.io())
         .buffer(3)
         .subscribe(new Observer<List<Integer>>() {
            @Override
            public void onSubscribe(Disposable d) {
               System.out.println("Subscribed");
            }
            @Override
            public void onNext(List<Integer> integers) {
               System.out.println("onNext: ");
               for (Integer value : integers) {
                  System.out.println(value);
               }
            }
            @Override
            public void onError(Throwable e) {
               System.out.println("Error");
            }

            @Override
            public void onComplete() {
               System.out.println("Done! ");
            }
         });
      Thread.sleep(3000);
   }
}

Verify the Result

按照如下方式使用 javac 编译器编译类 −

Compile the class using javac compiler as follows −

C:\RxJava>javac ObservableTester.java

现在按照如下所示运行 ObservableTester：

Now run the ObservableTester as follows −

C:\RxJava>java ObservableTester

它应该产生以下输出 −

It should produce the following output −

Subscribed
onNext:
1
2
3
onNext:
4
5
6
onNext:
7
8
9
Done!