@Override
    void dispatch(Object event, Iterator<Subscriber> subscribers) {
      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 {

   */
  final void init() {
    /*
     * requireNonNull is safe because this is called from the constructor after `futures` is set but
     * before releaseResources could be called (because we have not yet set up any of the listeners
     * that could call it, nor exposed this Future for users to call cancel() on).
     */
    requireNonNull(futures);

    // Corner case: List is empty.

  private static <N, V> GraphConnections<N, V> connectionsOf(ValueGraph<N, V> graph, N node) {
    Function<N, V> successorNodeToValueFn =
        (N successorNode) ->
            // requireNonNull is safe because the endpoint pair comes from the graph.
            requireNonNull(graph.edgeValueOrDefault(node, successorNode, null));
    return graph.isDirected()
        ? DirectedGraphConnections.ofImmutable(

                super(session, trace);
                this.requestType = requireNonNull(requestType, "requestType cannot be null");
                this.project = project;
                this.rootArtifact = rootArtifact;
                this.root = root;
                this.dependencies = List.copyOf(requireNonNull(dependencies, "dependencies cannot be null"));
                this.managedDependencies =

import static java.nio.file.attribute.AclEntryFlag.FILE_INHERIT;
import static java.nio.file.attribute.AclEntryType.ALLOW;
import static java.nio.file.attribute.PosixFilePermissions.asFileAttribute;
import static java.util.Objects.requireNonNull;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableList;

   * CompactHashMap.
   */

  private int[] requirePredecessors() {
    return requireNonNull(predecessor);
  }

  private int[] requireSuccessors() {
    return requireNonNull(successor);
  }

  /*
   * We don't define getPredecessor+getSuccessor and setPredecessor+setSuccessor here because

        (n == entryArray.length) ? (Entry<K, V>[]) entryArray : createEntryArray(n);
    int hashCode = 0;

    for (int i = 0; i < n; i++) {
      // requireNonNull is safe because the first `n` elements have been filled in.
      Entry<K, V> entry = requireNonNull(entryArray[i]);
      K key = entry.getKey();
      V value = entry.getValue();
      checkEntryNotNull(key, value);
      int keyHash = key.hashCode();

   * types (or if the type is a non-variable type, like {@code String}), then code should almost
   * never use this method, preferring instead to call {@code requireNonNull} so as to benefit from
   * its runtime check.
   *
   * <p>An example use case for this method is in implementing an {@code Iterator<T>} whose {@code

 * limitations under the License.
 */

package com.google.common.collect;

import static com.google.common.base.Preconditions.checkNotNull;
import static java.util.Objects.requireNonNull;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;

    /**
     * Creates a new source backed by the specified URL.
     *
     * @param url The file, must not be {@code null}.
     */
    public UrlSource(URL url) {
        this.url = Objects.requireNonNull(url, "url cannot be null");
        this.hashCode = Objects.hashCode(url);
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return url.openStream();
    }