RxJava 和 RxAndroid 五（线程调度）补充研究

线程调度文章：https://blog.csdn.net/rnZuoZuo/article/details/83830391

研究结论：默认情况下，不指定生产者线程和消费者线程，运行在当前线程，

但是如果emitter在发射的时候放在一个新的线程里，那么加工线程和消费线程保持和这个新的线程一致

测试代码：

public class MainDemo {
    public static void main(String[] args){
        Observable.create(new ObservableOnSubscribe<Integer>() {
            @Override
            public void subscribe(final ObservableEmitter<Integer> emitter) throws Exception {
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        emitter.onNext(1);
                        emitter.onComplete();
                    }
                }).start();
                System.out.println( "rx_call_1:" + Thread.currentThread().getName()  );
            }
        })

                . map(new Function<Integer, Integer>() {
            @Override
            public Integer apply(Integer cmsResponse) throws Exception {
                System.out.println( "rx_call_map:" + Thread.currentThread().getName()  );
                return 2;
            }
        }).
                subscribe(new Observer<Integer>() {
            @Override
            public void onSubscribe(Disposable d) {

            }

            @Override
            public void onNext(Integer integer) {
                System.out.println( "rx_call_2:" + Thread.currentThread().getName()  );

            }

            @Override
            public void onError(Throwable e) {

            }

            @Override
            public void onComplete() {

            }
        });

    }
}

下面虽然指定里生产者线程 subscribeOn(Schedulers.io())，但是加工线程和消费线程还是跟随emiter.onnext执行的线程

public class MainDemo {
    public static void main(String[] args){
        Observable.create(new ObservableOnSubscribe<Integer>() {
            @Override
            public void subscribe(final ObservableEmitter<Integer> emitter) throws Exception {
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        emitter.onNext(1);
                        emitter.onComplete();
                    }
                }).start();
                System.out.println( "rx_call_1:" + Thread.currentThread().getName()  );
            }
        })

                . map(new Function<Integer, Integer>() {
            @Override
            public Integer apply(Integer cmsResponse) throws Exception {
                System.out.println( "rx_call_map:" + Thread.currentThread().getName()  );
                return 2;
            }
        }) .subscribeOn(Schedulers.io())
                .subscribe(new Observer<Integer>() {
            @Override
            public void onSubscribe(Disposable d) {

            }

            @Override
            public void onNext(Integer integer) {
                System.out.println( "rx_call_2:" + Thread.currentThread().getName()  );

            }

            @Override
            public void onError(Throwable e) {

            }

            @Override
            public void onComplete() {

            }
        });

    }
}