Rxjava2 阻塞订阅与订阅

Question

我已经阅读了关于blockingSubscribe() 和subscribe() 的解释，但我既不能写也不能找到例子来看看它们的区别。似乎这两者的工作方式相同。有人可以提供这两个的例子，最好是Java。

Answer 1

blockingSubscribe 阻塞当前线程并在那里处理 incomnig 事件。您可以通过运行一些异步源来看到这一点：

System.out.println("Before blockingSubscribe");
System.out.println("Before Thread: " + Thread.currentThread());

Observable.interval(1, TimeUnit.SECONDS)
.take(5)
.blockingSubscribe(t -> {
     System.out.println("Thread: " + Thread.currentThread());
     System.out.println("Value:  " + t);
});

System.out.println("After blockingSubscribe");
System.out.println("After Thread: " + Thread.currentThread());

subscribe 没有这样的限制，可以在任意线程上运行：

System.out.println("Before subscribe");
System.out.println("Before Thread: " + Thread.currentThread());

Observable.timer(1, TimeUnit.SECONDS, Schedulers.io())
.concatWith(Observable.timer(1, TimeUnit.SECONDS, Schedulers.single()))
.subscribe(t -> {
     System.out.println("Thread: " + Thread.currentThread());
     System.out.println("Value:  " + t);
});


System.out.println("After subscribe");
System.out.println("After Thread: " + Thread.currentThread());

// RxJava uses daemon threads, without this, the app would quit immediately
Thread.sleep(3000);

System.out.println("Done");