* setException(stackOverflowError) would fail:
     *
     * - If the stack overflowed before set()/setValue() could even store the result in the output
     * Future, then a call setException() would likely also overflow.
     *
     * - If the stack overflowed after set()/setValue() stored its result, then a call to
     * setException() will be a no-op because the Future is already done.
     *

   * specified function to each item in an {@code Iterable} of values. Each value will be stored as
   * a value in the resulting multimap, yielding a multimap with the same size as the input
   * iterable. The key used to store that value in the multimap will be the result of calling the
   * function on that value. The resulting multimap is created as an immutable snapshot. In the

   * specified function to each item in an {@code Iterable} of values. Each value will be stored as
   * a value in the resulting multimap, yielding a multimap with the same size as the input
   * iterable. The key used to store that value in the multimap will be the result of calling the
   * function on that value. The resulting multimap is created as an immutable snapshot. In the

    /**
     * The flag to check if the data store is alive.
     */
    protected boolean alive = true;

    /**
     * Register this data store.
     */
    public void register() {
        ComponentUtil.getDataStoreFactory().add(getName(), this);
    }

    /**
     * Get the name of this data store.
     * @return The name of this data store.
     */
    protected abstract String getName();

import org.codelibs.fess.unit.UnitFessTestCase;

public class DataStoreExceptionTest extends UnitFessTestCase {

    public void test_constructor_withMessage() {
        // Test with message only
        String message = "Data store error occurred";
        DataStoreException exception = new DataStoreException(message);

        assertNotNull(exception);
        assertEquals(message, exception.getMessage());
        assertNull(exception.getCause());

        return getKuromojiFile(dictId).map(file -> file.get(id).get());
    }

    /**
     * Store a Kuromoji item.
     *
     * @param dictId The dictionary ID.
     * @param kuromojiItem The Kuromoji item to store.
     */
    public void store(final String dictId, final KuromojiItem kuromojiItem) {
        getKuromojiFile(dictId).ifPresent(file -> {

   * remove()}. Otherwise, all optional operations are supported. Null row keys, columns keys, and
   * values are not supported.
   *
   * <p>Lookups by row key are often faster than lookups by column key, because the data is stored
   * in a {@code Map<R, Map<C, V>>}. A method call like {@code column(columnKey).get(rowKey)} still
   * runs quickly, since the row key is provided. However, {@code column(columnKey).size()} takes

        @Override
        public void store(DataConfig dataConfig, IndexUpdateCallback callback, DataStoreParams params) {
            /* No-op */ }

        @Override
        public void stop() {
            /* No-op */ }
    }

    private static class FastMockFailureUrlService extends FailureUrlService {
        public void store(DataConfig dataConfig, String errorName, String url, Throwable e) {

 * implementations may store cookies in memory; sophisticated ones may use the file system or
 * database to hold accepted cookies. The [cookie storage model][rfc_6265_53] specifies policies for
 * updating and expiring cookies.
 *
 * [rfc_6265_53]: https://tools.ietf.org/html/rfc6265#section-5.3
 */
interface CookieJar {
  /**
   * Saves [cookies] from an HTTP response to this store according to this jar's policy.
   *

    }
  }

  @Test fun toMultimapGroupsHeaders() {
    val headers =
      Headers.headersOf(
        "cache-control",
        "no-cache",
        "cache-control",
        "no-store",
        "user-agent",
        "OkHttp",
      )
    val headerMap = headers.toMultimap()
    assertThat(headerMap["cache-control"]!!.size).isEqualTo(2)
    assertThat(headerMap["user-agent"]!!.size).isEqualTo(1)