RxJava之连接操作符介绍

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连接相关的操作符 以及 官方介绍

RxJava 之 连接操作符 官方介绍 ：Connectable Observable Operators

• ConnectableObservable.connect( )

  instructs a Connectable Observable to begin emitting items
  指示Connectable Observable开始发出项目

• Observable.publish( )

  represents an Observable as a Connectable Observable
  将Observable表示为可连接的Observable

• Observable.replay( )

  ensures that all Subscribers see the same sequence of emitted items, even if they subscribe after the Observable begins emitting the items
  确保所有订阅者都看到相同的发射项目序列，即使他们在Observable开始发布项目后订阅

• ConnectableObservable.refCount( )

  makes a Connectable Observable behave like an ordinary Observable
  使Connectable Observable的行为类似于普通的Observable

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示例：

非连接操作

ConnectableObservable firstMillion = Observable.range(1, 1000000)
        .sample(7, TimeUnit.MILLISECONDS)
        .publish();

firstMillion.subscribe(new Consumer() {
    @Override
    public void accept(Object it) throws Exception {
        System.out.println("Subscriber #1:" + it);
    }
}, new Consumer<Throwable>() {
    @Override
    public void accept(Throwable it) throws Exception {
        System.out.println("Error: " + it.getMessage());
    }
}, new Action() {
    @Override
    public void run() throws Exception {
        System.out.println("Sequence #1 complete");
    }
});

firstMillion.subscribe(new Consumer() {
    @Override
    public void accept(Object it) throws Exception {
        System.out.println("Subscriber #2:" + it);
    }
}, new Consumer<Throwable>() {
    @Override
    public void accept(Throwable it) throws Exception {
        System.out.println("Error: " + it.getMessage());
    }
}, new Action() {
    @Override
    public void run() throws Exception {
        System.out.println("Sequence #2 complete");
    }
});

输出：

Subscriber #1:391999
Sequence #1 complete
Subscriber #2:556663
Sequence #2 complete

---

publish and connect

官方示例：

ConnectableObservable firstMillion = Observable.range(1, 1000000)
        .sample(7, TimeUnit.MILLISECONDS)
        .publish();

firstMillion.subscribe(new Consumer() {
    @Override
    public void accept(Object it) throws Exception {
        System.out.println("Subscriber #1:" + it);
    }
}, new Consumer<Throwable>() {
    @Override
    public void accept(Throwable it) throws Exception {
        System.out.println("Error: " + it.getMessage());
    }
}, new Action() {
    @Override
    public void run() throws Exception {
        System.out.println("Sequence #1 complete");
    }
});

firstMillion.subscribe(new Consumer() {
    @Override
    public void accept(Object it) throws Exception {
        System.out.println("Subscriber #2:" + it);
    }
}, new Consumer<Throwable>() {
    @Override
    public void accept(Throwable it) throws Exception {
        System.out.println("Error: " + it.getMessage());
    }
}, new Action() {
    @Override
    public void run() throws Exception {
        System.out.println("Sequence #2 complete");
    }
});

firstMillion.connect();

输出：

Subscriber #1:984513
Subscriber #2:984513
Sequence #1 complete
Sequence #2 complete

---

publish and refCount

官方示例：

ConnectableObservable firstMillion = Observable.range(1, 1000000)
        .sample(7, TimeUnit.MILLISECONDS)
        .publish();

firstMillion.refCount().subscribe(new Consumer() {
    @Override
    public void accept(Object it) throws Exception {
        System.out.println("Subscriber #1:" + it);
    }
}, new Consumer<Throwable>() {
    @Override
    public void accept(Throwable it) throws Exception {
        System.out.println("Error: " + it.getMessage());
    }
}, new Action() {
    @Override
    public void run() throws Exception {
        System.out.println("Sequence #1 complete");
    }
});

firstMillion.refCount().subscribe(new Consumer() {
    @Override
    public void accept(Object it) throws Exception {
        System.out.println("Subscriber #2:" + it);
    }
}, new Consumer<Throwable>() {
    @Override
    public void accept(Throwable it) throws Exception {
        System.out.println("Error: " + it.getMessage());
    }
}, new Action() {
    @Override
    public void run() throws Exception {
        System.out.println("Sequence #2 complete");
    }
});

输出：

Subscriber #1:438899
Sequence #1 complete
Subscriber #2:684698
Sequence #2 complete

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以上