default:
            log.warn("Unknown RDMA provider preference: {}", preference);
            break;
        }

        return null;
    }

    /**
     * Get RDMA provider based on configuration
     *
     * @param config the configuration to read provider preference from
     * @return RDMA provider instance, or null if none available
     */

        for (Artifact artifact : artifacts) {
            if (artifact.isSnapshot()) {
                Object key = RemoteSnapshotMetadata.getKey(artifact);
                RemoteSnapshotMetadata snapshotMetadata = snapshots.get(key);
                if (snapshotMetadata == null) {
                    snapshotMetadata = new RemoteSnapshotMetadata(artifact, timestamp, buildNumber);
                    snapshots.put(key, snapshotMetadata);
                }

    return finishToValueAndCloser(closingFuture).get();
  }

  @Override
  void assertFinallyFailsWithException(ClosingFuture<?> closingFuture) {
    assertThatFutureFailsWithException(closingFuture.statusFuture());
    ValueAndCloser<?> valueAndCloser = finishToValueAndCloser(closingFuture);
    try {
      valueAndCloser.get();
      fail();
    } catch (ExecutionException expected) {

        builder.append(' ');
        builder.append(name);
        builder.append('(');
        for (int i = 0; i < parameters.size(); i++) {
            ParameterMetaData param = parameters.get(i);
            if (i > 0) {
                builder.append(", ");
            }
            builder.append(param.getSignature());
        }
        builder.append(')');
        return builder.toString();

            throw new CrawlerSystemException("Extractor instance is null. Cannot register null extractor.");
        }
        if (extractorMap.containsKey(key)) {
            final Extractor[] existingExtractors = extractorMap.get(key);

            final Extractor[] newExtractors = new Extractor[existingExtractors.length + 1];
            System.arraycopy(existingExtractors, 0, newExtractors, 0, existingExtractors.length);

            }

            @Override
            public List<ArtifactVersion> retrieveAvailableVersionsFromDeploymentRepository(
                    Artifact artifact, ArtifactRepository localRepository, ArtifactRepository remoteRepository) {
                throw new UnsupportedOperationException("Cannot get available versions in this test case");

      checkNotNull(event);
      checkNotNull(subscribers);
      // requireNonNull accommodates Android's @RecentlyNullable annotation on ThreadLocal.get
      Queue<Event> queueForThread = requireNonNull(queue.get());
      queueForThread.offer(new Event(event, subscribers));

      if (!dispatching.get()) {
        dispatching.set(true);
        try {
          Event nextEvent;
          while ((nextEvent = queueForThread.poll()) != null) {

 * ordering of values for a given key. See the {@link Multimap} documentation for information common
 * to all multimaps.
 *
 * <p>The {@link #get}, {@link #removeAll}, and {@link #replaceValues} methods each return a {@link
 * List} of values. Though the method signature doesn't say so explicitly, the map returned by
 * {@link #asMap} has {@code List} values.
 *

 * ordering of values for a given key. See the {@link Multimap} documentation for information common
 * to all multimaps.
 *
 * <p>The {@link #get}, {@link #removeAll}, and {@link #replaceValues} methods each return a {@link
 * List} of values. Though the method signature doesn't say so explicitly, the map returned by
 * {@link #asMap} has {@code List} values.
 *

    @Override
    public Key createKey(List<Artifact> extensionArtifacts) {
        return new CacheKey(extensionArtifacts);
    }

    @Override
    public CacheRecord get(Key key) {
        return cache.get(key);
    }

    @Override
    public CacheRecord put(
            Key key, ClassRealm extensionRealm, ExtensionDescriptor extensionDescriptor, List<Artifact> artifacts) {