* typically false on Windows.
 *
 * If this returns false we won't permit simultaneous reads and writes. When writes commit we need
 * to delete the previous snapshots, and that won't succeed if the file is open. (We do permit
 * multiple simultaneous reads.)
 *
 * @param file a file in the directory to check. This file shouldn't already exist!
 */

          <association>
            <type>RepositoryPolicy</type>
          </association>
        </field>
        <field>
          <name>snapshots</name>
          <version>1.0.0+</version>
          <description>
            How to handle downloading of snapshots from this repository
          </description>
          <association>
            <type>RepositoryPolicy</type>
          </association>

     *     <li>"s" - contextual snapshot filter</li>
     *     <li>"e(G:A:V)" - predicate filter (leaves out G:A:V from range, if hit, V can be range)</li>
     * </ul>
     * Example filter expression: <code>"h(5);s;e(org.foo:bar:1)</code> will cause: ranges are filtered for "top 5" (instead
     * full range), snapshots are banned if root project is not a snapshot, and if range for <code>org.foo:bar</code> is

    val key = key(request.url)
    val snapshot: DiskLruCache.Snapshot =
      try {
        cache[key] ?: return null
      } catch (_: IOException) {
        return null // Give up because the cache cannot be read.
      }

    val entry: Entry =
      try {
        Entry(snapshot.getSource(ENTRY_METADATA))
      } catch (_: IOException) {
        snapshot.closeQuietly()
        return null
      }

    TransferListener getTransferListener();

    // Logging
    MavenExecutionRequest setLoggingLevel(int loggingLevel);

    int getLoggingLevel();

    // Update snapshots
    MavenExecutionRequest setUpdateSnapshots(boolean updateSnapshots);

    boolean isUpdateSnapshots();

    MavenExecutionRequest setNoSnapshotUpdates(boolean noSnapshotUpdates);

crawler.ignore.content.exception=true
crawler.failure.url.status.codes=404
crawler.system.monitor.interval=60
crawler.hotthread.ignore_idle_threads=true
crawler.hotthread.interval=500ms
crawler.hotthread.snapshots=10
crawler.hotthread.threads=3
crawler.hotthread.timeout=30s
crawler.hotthread.type=cpu
crawler.metadata.content.excludes=resourceName,X-Parsed-By,Content-Encoding.*,Content-Type.*,X-TIKA.*,X-FESS.*

   * a view of the multiset whose elements are of this class. A multiset implementation may return
   * Entry instances that are either live "read-through" views to the Multiset, or immutable
   * snapshots. Note that this type is unrelated to the similarly-named type {@code Map.Entry}.
   *
   * @since 2.0
   */
  interface Entry<E extends @Nullable Object> {

    /**

   * a view of the multiset whose elements are of this class. A multiset implementation may return
   * Entry instances that are either live "read-through" views to the Multiset, or immutable
   * snapshots. Note that this type is unrelated to the similarly-named type {@code Map.Entry}.
   *
   * @since 2.0
   */
  interface Entry<E extends @Nullable Object> {

    /**

          <association>
            <type>RepositoryPolicy</type>
          </association>
        </field>
        <field>
          <name>snapshots</name>
          <version>4.0.0+</version>
          <description>How to handle downloading of snapshots from this repository.</description>
          <association>
            <type>RepositoryPolicy</type>
          </association>
        </field>

    /**
     * Get the value for the key 'crawler.hotthread.snapshots'. <br>
     * The value is, e.g. 10 <br>
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getCrawlerHotthreadSnapshots();

    /**
     * Get the value for the key 'crawler.hotthread.snapshots' as {@link Integer}. <br>
     * The value is, e.g. 10 <br>