import java.util.List;

import org.codelibs.core.beans.util.BeanUtil;
import org.codelibs.fess.Constants;
import org.codelibs.fess.app.pager.WebAuthPager;
import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.opensearch.config.cbean.WebAuthenticationCB;
import org.codelibs.fess.opensearch.config.exbhv.WebAuthenticationBhv;
import org.codelibs.fess.opensearch.config.exentity.WebAuthentication;

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.mylasta.direction.sponsor;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.UUID;
import java.util.function.Supplier;
import java.util.stream.Collectors;

	// Buffers sent on out can not be referenced once sent.
	StreamHandlerFn func(ctx context.Context, payload []byte, in <-chan []byte, out chan<- []byte) *RemoteErr

	// StreamHandler handles fully bidirectional streams,
	// There is flow control in both directions.
	StreamHandler struct {
		// Handle an incoming request. Initial payload is sent.
		// Additional input packets (if any) are streamed to request.

import org.codelibs.fess.app.web.api.ApiResult;
import org.codelibs.fess.app.web.api.ApiResult.ApiBackupFilesResponse;
import org.codelibs.fess.app.web.api.admin.FessApiAdminAction;
import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.util.ComponentUtil;
import org.codelibs.fess.util.SearchEngineUtil;
import org.lastaflute.web.Execute;
import org.lastaflute.web.response.JsonResponse;

import java.util.Map;
import java.util.function.Function;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.codelibs.core.lang.StringUtil;
import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.opensearch.client.SearchEngineClient;
import org.codelibs.fess.util.ComponentUtil;
import org.opensearch.action.bulk.BulkRequestBuilder;
import org.opensearch.action.bulk.BulkResponse;

import org.codelibs.fess.Constants;
import org.codelibs.fess.app.pager.FailureUrlPager;
import org.codelibs.fess.exception.ContainerNotAvailableException;
import org.codelibs.fess.helper.SystemHelper;
import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.opensearch.config.cbean.FailureUrlCB;
import org.codelibs.fess.opensearch.config.exbhv.FailureUrlBhv;
import org.codelibs.fess.opensearch.config.exentity.CrawlingConfig;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.function.BiConsumer;

import org.codelibs.fess.helper.SystemHelper;
import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.opensearch.log.exbhv.FavoriteLogBhv;
import org.codelibs.fess.opensearch.log.exbhv.UserInfoBhv;
import org.codelibs.fess.opensearch.log.exentity.FavoriteLog;

import java.util.List;

import org.codelibs.core.beans.util.BeanUtil;
import org.codelibs.fess.Constants;
import org.codelibs.fess.app.pager.ReqHeaderPager;
import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.opensearch.config.cbean.RequestHeaderCB;
import org.codelibs.fess.opensearch.config.exbhv.RequestHeaderBhv;
import org.codelibs.fess.opensearch.config.exentity.RequestHeader;

public interface PredecessorsFunction<N> {

  /**
   * Returns all nodes in this graph adjacent to {@code node} which can be reached by traversing
   * {@code node}'s incoming edges <i>against</i> the direction (if any) of the edge.
   *
   * <p>Some algorithms that operate on a {@code PredecessorsFunction} may produce undesired results
   * if the returned {@link Iterable} contains duplicate elements. Implementations of such

public interface SuccessorsFunction<N> {

  /**
   * Returns all nodes in this graph adjacent to {@code node} which can be reached by traversing
   * {@code node}'s outgoing edges in the direction (if any) of the edge.
   *
   * <p>This is <i>not</i> the same as "all nodes reachable from {@code node} by following outgoing
   * edges". For that functionality, see {@link Graphs#reachableNodes(Graph, Object)}.
   *