public StorageMedia getStorageMediaFor()

in storage/src/main/java/org/apache/uniffle/storage/common/DefaultStorageMediaProvider.java [49:99]
46 lines of code
14 McCabe index (conditional complexity)

  public StorageMedia getStorageMediaFor(String baseDir) {
    try {
      URI uri = new URI(baseDir);
      String scheme = uri.getScheme();
      if (HDFS.equals(scheme)) {
        return StorageMedia.HDFS;
      } else if (scheme != null && OBJECT_STORE_SCHEMAS.contains(scheme.toLowerCase())) {
        return StorageMedia.OBJECT_STORE;
      }
    } catch (URISyntaxException e) {
      logger.warn("invalid uri input from " + baseDir + ", with exception:", e);
    }
    // if baseDir starts with HDFS, the hdfs storage type should be reported
    if (SystemUtils.IS_OS_LINUX) {
      // according to https://unix.stackexchange.com/a/65602, we can detect disk types by looking at
      // the
      // `/sys/block/sdx/queue/rotational`.
      try {
        File baseFile = new File(baseDir);
        FileStore store = getFileStore(baseFile.toPath());
        if (store == null) {
          URI uri = new URI(baseDir);
          String scheme = uri.getScheme();
          if (FILE.equals(scheme)) {
            store = getFileStore(Paths.get(uri));
          }
        }
        if (store == null) {
          throw new IOException("Can't get FileStore for path:" + baseFile.getAbsolutePath());
        }
        String deviceName = getDeviceName(store.name());
        File blockFile = new File(String.format(BLOCK_PATH_FORMAT, deviceName));
        if (blockFile.exists()) {
          List<String> contents = Files.readAllLines(blockFile.toPath());
          // this should always hold true
          if (contents.size() >= 1) {
            String rotational = contents.get(0);
            if (rotational.equals("0")) {
              return StorageMedia.SSD;
            } else if (rotational.equals("1")) {
              return StorageMedia.HDD;
            }
          }
        }
      } catch (IOException | URISyntaxException e) {
        logger.warn("Get storage type failed with exception", e);
      }
    }
    logger.info("Default storage type provider returns HDD by default");
    return StorageMedia.HDD;
  }