List directory content with Project Reactor and DirectoryStream

Question

I\'d like to use DirectoryStream with Project Reactor to list all the files in a directory.

My try is:

Path myDir = Paths.get(\"C:\\\\Users\\\\r.dacanal\         


        

Answer 1

list(dir) on directories with large amount of files uses too much memory, there is a reason for newDirectoryStream

Answer 2

Subscribe repeatedly calls iterator(), but DirectoryStream has a check to ensure that the iterator must be null before assigning it's own

@Override
public Iterator<Path> iterator() {
    if (!isOpen) {
        throw new IllegalStateException("Directory stream is closed");
    }
    synchronized (this) {
        if (iterator != null)
            throw new IllegalStateException("Iterator already obtained");
        iterator = new WindowsDirectoryIterator(firstName);
        return iterator;
    }
}

Although if you are using Java 8+ there is 0 reason to be using newDirectoryStream(dir) as you can use list(dir) to provide an actual Stream

The following should work

Path myDir = Paths.get("C:\\Users\\r.dacanal\\Documents\\Reply\\EDA\\logging-consumer\\input");
Stream<Path> directoryStream = Files.list(myDir);
Flux.fromStream(directoryStream).doOnNext(System.out::println).subscribe();