private Mono<Path> createTempFile(String name) {
        String prefix = name +"_";
        return Mono.defer(() -> {
            Path dir1 = Path.of(dir);
           return isExist(dir1).flatMap(path -> createFile(path, prefix, ".jpg"));
        }).subscribeOn(Schedulers.boundedElastic());
    }

    private Mono<Path> isExist(Path path){
        return Mono.fromCallable(()->{
            if(Files.notExists(path)){
                return  Files.createDirectories(path);
            }
            return path;
        }).subscribeOn(Schedulers.boundedElastic());
    }

    private Mono<Path> createFile(Path path, String prefix, String suffix){
        return Mono.fromCallable(()->Files.createTempFile(path,prefix, ".jpg"))
                .subscribeOn(Schedulers.boundedElastic());
    }