protected boolean refreshLocked()

in java/com/facebook/soloader/UnpackingSoSource.java [368:425]
50 lines of code
9 McCabe index (conditional complexity)

  protected boolean refreshLocked(final FileLocker lock, final int flags, final byte[] deps)
      throws IOException {
    final File stateFileName = new File(soDirectory, STATE_FILE_NAME);
    byte state;
    try (RandomAccessFile stateFile = new RandomAccessFile(stateFileName, "rw")) {
      try {
        state = stateFile.readByte();
        if (state != STATE_CLEAN) {
          Log.v(TAG, "dso store " + soDirectory + " regeneration interrupted: wiping clean");
          state = STATE_DIRTY;
        }
      } catch (EOFException ex) {
        state = STATE_DIRTY;
      }
    }

    final File depsFileName = new File(soDirectory, DEPS_FILE_NAME);
    DsoManifest desiredManifest = null;
    try (RandomAccessFile depsFile = new RandomAccessFile(depsFileName, "rw")) {
      byte[] existingDeps = new byte[(int) depsFile.length()];
      if (depsFile.read(existingDeps) != existingDeps.length) {
        Log.v(TAG, "short read of so store deps file: marking unclean");
        state = STATE_DIRTY;
      }

      if (depsChanged(existingDeps, deps)) {
        Log.v(TAG, "deps mismatch on deps store: regenerating");
        state = STATE_DIRTY;
      }

      if (state == STATE_DIRTY || ((flags & SoSource.PREPARE_FLAG_FORCE_REFRESH) != 0)) {
        Log.v(TAG, "so store dirty: regenerating");
        writeState(stateFileName, STATE_DIRTY);

        try (Unpacker u = makeUnpacker(state)) {
          desiredManifest = u.getDsoManifest();
          try (InputDsoIterator idi = u.openDsoIterator()) {
            regenerate(state, desiredManifest, idi);
          }
        }
      }
    }

    if (desiredManifest == null) {
      return false; // No sync needed
    }

    final DsoManifest manifest = desiredManifest;

    Runnable syncer = createSyncer(lock, deps, stateFileName, depsFileName, manifest, false);
    if ((flags & PREPARE_FLAG_ALLOW_ASYNC_INIT) != 0) {
      new Thread(syncer, "SoSync:" + soDirectory.getName()).start();
    } else {
      syncer.run();
    }

    return true;
  }