} while (System.nanoTime() - deadline < 0);
    throw formatRuntimeException(
        "Predicate did not become true within %d second timeout", timeoutSeconds);
  }

  /**
   * Waits until the given latch has {@linkplain CountDownLatch#countDown counted down} to zero,
   * invoking the garbage collector as necessary to try to ensure that this will happen.
   *
   * @throws RuntimeException if timed out or interrupted while waiting

            return method.equals(getAllStatesMethod)
                ? getAllStates()
                : invokeListMethod(method, args);
          }

          private Set<List<Integer>> getAllStates() {
            return allStates;
          }

          private Object invokeListMethod(Method method, Object[] args) throws Throwable {
            try {

         * @param params the parameters to use during content building
         * @return the modified XContentBuilder
         * @throws IOException if an IO error occurs during building
         */
        XContentBuilder apply(XContentBuilder builder, ToXContent.Params params) throws IOException;
    }

  public boolean addAll(Collection<? extends E> elementsToAdd) {
    throw up();
  }

  @Override
  public boolean removeAll(Collection<?> elementsToRemove) {
    throw up();
  }

  @Override
  public boolean retainAll(Collection<?> elementsToRetain) {
    throw up();
  }

  @Override
  public void clear() {
    throw up();
  }

  private static UnsupportedOperationException up() {

          throw new IOException();
        }

        @Override
        public Appendable append(@Nullable CharSequence csq, int start, int end)
            throws IOException {
          throw new IOException();
        }

        @Override
        public Appendable append(char c) throws IOException {
          throw new IOException();
        }
      };

    if (key == null) {
      throw new NullPointerException("null key in entry: null=" + value);
    } else if (value == null) {
      throw new NullPointerException("null value in entry: " + key + "=null");
    }
  }

  @CanIgnoreReturnValue
  static int checkNonnegative(int value, String name) {
    if (value < 0) {
      throw new IllegalArgumentException(name + " cannot be negative but was: " + value);

    super(checkNotNull(out));
    this.hasher = checkNotNull(hashFunction.newHasher());
  }

  @Override
  public void write(int b) throws IOException {
    hasher.putByte((byte) b);
    out.write(b);
  }

  @Override
  public void write(byte[] bytes, int off, int len) throws IOException {
    hasher.putBytes(bytes, off, len);
    out.write(bytes, off, len);
  }

  /**

     *
     * @param sessionId unique identifier for the process session
     * @param command the command to send to the process
     * @throws JobNotFoundException if no process is found for the given session ID
     * @throws JobProcessingException if there's an error sending the command
     */
    public void sendCommand(final String sessionId, final String command) {
        final Process process;

     * @return {@link MessageDigest}
     * @throws RuntimeException
     *             If a {@link NoSuchAlgorithmException} occurs
     */
    public static MessageDigest getInstance(final String algorithm) {
        assertArgumentNotEmpty("algorithm", algorithm);

        try {
            return MessageDigest.getInstance(algorithm);
        } catch (final NoSuchAlgorithmException e) {
            throw new NoSuchAlgorithmRuntimeException(e);

public class RankFusionProcessorErrorHandlingTest extends UnitFessTestCase {

    private static final String ID_FIELD = "_id";

    /**
     * Test handling of searcher that throws RuntimeException.
     */
    @Test
    public void test_searcherThrowsRuntimeException() throws Exception {
        try (RankFusionProcessor processor = new RankFusionProcessor()) {
            processor.setSearcher(new TestSearcher(100));