Method main

src/tools/diskcache/Gc.java:81–115

(String[] args)

          new ThreadFactoryBuilder().setNameFormat("disk-cache-gc-%d").build());

  public static void main(String[] args) throws Exception {
    OptionsParser op = OptionsParser.builder().optionsClasses(Options.class).build();
    op.parseAndExitUponError(args);

    Options options = op.getOptions(Options.class);

    if (options.diskCache == null) {
      System.err.println("--disk_cache must be specified.");
      System.exit(1);
    }

    if (options.maxSize <= 0 && options.maxAge.isZero()) {
      System.err.println(
          "At least one of --max_size or --max_age must be set to a positive value.");
      System.exit(1);
    }

    var root = getFileSystem().getPath(options.diskCache);
    if (!root.isDirectory()) {
      System.err.println("Expected --disk_cache to exist and be a directory.");
      System.exit(1);
    }

    var policy =
        new CollectionPolicy(
            options.maxSize == 0 ? Optional.empty() : Optional.of(options.maxSize),
            options.maxAge.isZero() ? Optional.empty() : Optional.of(options.maxAge));

    var gc = new DiskCacheGarbageCollector(root, executorService, policy);

    CollectionStats stats = gc.run();

    System.out.println(stats.displayString());
    System.exit(0);
  }

  private static FileSystem getFileSystem() {
    // Note: the digest function is irrelevant, as the garbage collector scans the entire disk cache