StorageState analyzeStorage()

in ratis-server/src/main/java/org/apache/ratis/server/storage/RaftStorageDirectoryImpl.java [132:173]

35 lines of code
8 McCabe index (conditional complexity)


  StorageState analyzeStorage(boolean toLock) throws IOException {
    Objects.requireNonNull(root, "root directory is null");

    String rootPath = root.getCanonicalPath();
    try { // check that storage exists
      if (!root.exists()) {
        LOG.info("The storage directory {} does not exist. Creating ...", rootPath);
        FileUtils.createDirectories(root);
      }
      // or is inaccessible
      if (!root.isDirectory()) {
        LOG.warn("{} is not a directory", rootPath);
        return StorageState.NON_EXISTENT;
      }
      if (!Files.isWritable(root.toPath())) {
        LOG.warn("The storage directory {} is not writable.", rootPath);
        return StorageState.NON_EXISTENT;
      }
    } catch(SecurityException ex) {
      LOG.warn("Cannot access storage directory " + rootPath, ex);
      return StorageState.NON_EXISTENT;
    }

    if (toLock) {
      this.lock(); // lock storage if it exists
    }

    // check enough space
    final long freeSpace = root.getFreeSpace();
    if (freeSpace < freeSpaceMin.getSize()) {
      LOG.warn("{} in directory {}: free space = {} < required = {}",
          StorageState.NO_SPACE, rootPath, freeSpace, freeSpaceMin);
      return StorageState.NO_SPACE;
    }

    // check whether current directory is valid
    if (isHealthy()) {
      return StorageState.NORMAL;
    } else {
      return StorageState.NOT_FORMATTED;
    }
  }