从RxJava 1到RxJava 2

Question

我正在尝试将这个RxJava1代码转换为RxJava2

public static Observable<Path> listFolder(Path dir, String glob) {
    return Observable.<Path>create(subscriber -> {
        try {
            DirectoryStream<Path> stream =
                    Files.newDirectoryStream(dir, glob);

            subscriber.add(Subscriptions.create(() -> {
                try {
                    stream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }));
            Observable.<Path>from(stream).subscribe(subscriber);
        } catch (DirectoryIteratorException ex) {
            subscriber.onError(ex);
        } catch (IOException ioe) {
            subscriber.onError(ioe);
        }
    });
}

问题是，在Rxjava2中，我没有让订阅者向它添加新的订阅。

Answer 1

享受RxJava 2的简洁(现在Flowable是背压支持类)：

public static Flowable<Path> listFolder(Path dir, String glob) {
    return Flowable.using(
        () -> Files.newDirectoryStream(dir, glob),
        stream -> Flowable.fromIterable(stream),
        stream -> stream.close());
}

如果你不想背压，那就用Flowable代替Observable。