code: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * 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.apache.skywalking.oap.server.core.storage.model;
  
  import lombok.Getter;
  import org.apache.skywalking.oap.server.core.analysis.record.Record;
  import org.apache.skywalking.oap.server.library.util.CollectionUtils;
  
  import java.util.List;
  import java.util.Optional;
  import java.util.stream.Collectors;
  
  public class ElasticSearchModelExtension {
  
      /**
       * Routing defines a field of {@link Record} to control the sharding policy.
       */
      @Getter
      private Optional<String> routing = Optional.empty();
  
      public void setRouting(String modelName, List<ModelColumn> modelColumns) throws IllegalStateException {
          if (CollectionUtils.isEmpty(modelColumns)) {
              return;
          }
  
          List<ModelColumn> routingColumns = modelColumns.stream()
                  .filter(col -> col.getElasticSearchExtension().isRouting())
                  .collect(Collectors.toList());
  
          int size = routingColumns.size();
          if (size > 1) {
              throw new IllegalStateException(modelName + "'s routing field is duplicated "
                      + routingColumns.stream()
                              .map(col -> col.getColumnName().toString())
                              .collect(Collectors.joining(",", "[", "]")));
          }
  
          if (size == 1) {
              routing = Optional.of(routingColumns.get(0).getColumnName().getName());
          }
      }
  }
  