Rxjava 简明教程

RxJava - Connectable Operators

以下是更精确控制订阅的运算符。

Following are the operators which has more precisely control over subscription.

Sr.No.

Operator & Description

1

Connect Instruct a connectable Observable to emit items to its subscribers.

2

Publish Converts an Observable to connectable Observable.

3

RefCount Converts a connectable Observable to ordinary Observable.

4

Replay Ensure same sequence of emitted items to be seen by each subscriber, even after the Observable has begun emitting items and subscribers subscribe later.

Connectable Operator 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.observables.ConnectableObservable;
//Using connect operator on a ConnectableObservable
public class ObservableTester {
   public static void main(String[] args) {
      String[] letters = {"a", "b", "c", "d", "e", "f", "g"};
      final StringBuilder result = new StringBuilder();
      ConnectableObservable<String> connectable = Observable.fromArray(letters).publish();
      connectable.subscribe(letter -> result.append(letter));
      System.out.println(result.length());
      connectable.connect();
      System.out.println(result.length());
      System.out.println(result);
   }
}

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 −

0
7
abcdefg