* @return
     * @throws SmbException
     */
    synchronized SmbFileHandleImpl ensureOpen () throws CIFSException {
        if ( this.handle == null || !this.handle.isValid() ) {
            // one extra acquire to keep this open till the stream is released
            if ( this.file instanceof SmbNamedPipe ) {
                this.handle = this.file.openUnshared(
                    SmbConstants.O_EXCL,

        assertEquals(
                "excluded-managed-dep", pom.getValue("dependencyManagement/dependencies[1]/exclusions[1]/artifactId"));

        assertEquals(1, ((List<?>) pom.getValue("dependencies")).size());
        assertEquals("org.apache.maven.its", pom.getValue("dependencies[1]/groupId"));
        assertEquals("dep", pom.getValue("dependencies[1]/artifactId"));

                this.dcListExpiration = now + this.netbiosCacheTimeout * 1000L;
                if ( list != null && list.length > 0 ) {
                    this.dcList = list;
                }
                else { /* keep using the old list */
                    this.dcListExpiration = now + 1000 * 60 * 15; /* 15 min */
                    log.warn("Failed to retrieve DC list from WINS");
                }
            }

                    dc_list_expiration = now + CACHE_POLICY * 1000L;
                    if (list != null && list.length > 0) {
                        dc_list = list;
                    } else { /* keep using the old list */
                        dc_list_expiration = now + 1000 * 60 * 15; /* 15 min */
                        if (SmbTransport.log.level >= 2) {

 * href="https://www.javadoc.io/doc/com.github.ben-manes.caffeine/caffeine/latest/com.github.benmanes.caffeine/com/github/benmanes/caffeine/cache/AsyncLoadingCache.html">their
 * deep support for asynchronous operations</a>. But if you want to migrate to Caffeine with minimal
 * code changes, you can use <a

     *
     * That combination upsets NullPointerTester, which wants any call that passes null for a
     * non-@Nullable parameter to trigger a NullPointerException.
     *
     * (We still define this empty method to keep PackageSanityTests from generating its own
     * automated nullness tests, which would fail.)
     */
  }

  private static final Object IGNORE_ME =
      new Object() {
        @Override

     * ImmutableSortedSet#orderedBy}.
     */
    /*
     * TODO(cpovirk): use Object[] instead of E[] in the mainline? (The backport is different and
     * doesn't need this suppression, but we keep it to minimize diffs.) Generally be more clear
     * about when we have an Object[] vs. a Comparable[] or other array type in internalArray? If we

   * href="https://github.com/google/guava/wiki/GraphsExplained#non-recursiveness">recursively</a>.
   * This is because the {@code forTree()}-based implementations don't keep track of visited nodes,
   * and therefore don't need to call `equals()` or `hashCode()` on the node objects; this saves
   * both time and space versus traversing the same graph using {@code forGraph()}.
   *

        }

        // We are forcing the use of the plugin realm for all lookups that might occur during
        // the lifecycle that is part of the lookup. Here we are specifically trying to keep
        // lookups that occur in contextualize calls in line with the right realm.
        ClassRealm oldLookupRealm = container.setLookupRealm(pluginRealm);

   *
   * <p>All Unicode White_Space characters are on the BMP and thus supported by this API.
   *
   * <p><b>Note:</b> as the Unicode definition evolves, we will modify this matcher to keep it up to
   * date.
   *
   * @since 19.0 (since 1.0 as constant {@code WHITESPACE})
   */
  public static CharMatcher whitespace() {
    return Whitespace.INSTANCE;
  }

  /**