public @Nullable Void call() throws Exception {
            // adds two nanoseconds to the ticker
            ticker.advance(1L);
            Thread.sleep(10);
            ticker.advance(1L);
            return null;
          }
        });

    assertEquals(numberOfThreads * 2, ticker.read());
  }

  @GwtIncompatible // concurrency

  public void testConcurrentAutoIncrementStep() throws Exception {

public interface MutableNetwork<N, E> extends Network<N, E> {

  /**
   * Adds {@code node} if it is not already present.
   *
   * <p><b>Nodes must be unique</b>, just as {@code Map} keys must be. They must also be non-null.
   *
   * @return {@code true} if the network was modified as a result of this call
   */
  @CanIgnoreReturnValue
  boolean addNode(N node);

  /**
   * Adds {@code edge} connecting {@code nodeU} to {@code nodeV}.

    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(
            node, graph.incidentEdges(node), successorNodeToValueFn)
        : UndirectedGraphConnections.ofImmutable(

        for (final WebApiManager webApiManager : webApiManagers) {
            if (webApiManager.matches(request)) {
                return webApiManager;
            }
        }
        return null;
    }

 */
package org.apache.maven.api.annotations;

import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

/**
 * The annotated element can be {@code null}.
 *
 * @see Nonnull
 * @since 4.0.0
 */
@Experimental
@Documented
@Retention(RetentionPolicy.RUNTIME)

public class InvalidParameterException extends InvalidPluginDescriptorException {
    public InvalidParameterException(String element, int i) {
        super("The " + element + " element in parameter # " + i + " is invalid. It cannot be null.");
    }

    public InvalidParameterException(String message, Throwable cause) {
        super(message, cause);
    }

        super(cause);
    }

    protected CrawlerSystemException(final String message, final boolean enableSuppression, final boolean writableStackTrace) {
        super(message, null, enableSuppression, writableStackTrace);
    }

) : Iterable<Pair<String, String>> {
  /** Returns the last value corresponding to the specified field, or null. */
  operator fun get(name: String): String? = commonHeadersGet(namesAndValues, name)

  /**
   * Returns the last value corresponding to the specified field parsed as an HTTP date, or null if
   * either the field is absent or cannot be parsed as a date.
   */

                    SID sid = ( pointers[ i ] != 0 ) ? pacStream.readSid() : null;
                    extraSidAtts[ i ] = new PacSidAttributes(sid, attributes[ i ]);
                }
            }

            // ID for resource domain (used with relative IDs to get SIDs)
            SID resourceDomainId = null;
            if ( resourceDomainIdPointer != 0 )
                resourceDomainId = pacStream.readSid();

            }
        }
    }


    public static byte[] decrypt ( byte[] data, Key key, int type ) throws GeneralSecurityException {
        Cipher cipher = null;
        byte[] decrypt = null;

        switch ( type ) {
        case KerberosConstants.DES_ENC_TYPE:
            decrypt = decryptDES(data, key, cipher);
            break;
        case KerberosConstants.RC4_ENC_TYPE: