content: /*
   * 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.kafka.streams.kstream.internals;
  
  import org.apache.kafka.streams.StreamsConfig;
  import org.apache.kafka.streams.processor.internals.StoreFactory;
  import org.apache.kafka.streams.state.DslStoreSuppliers;
  
  import java.util.HashSet;
  import java.util.Set;
  
  public abstract class AbstractConfigurableStoreFactory implements StoreFactory {
      private final Set<String> connectedProcessorNames = new HashSet<>();
      private DslStoreSuppliers dslStoreSuppliers;
  
      public AbstractConfigurableStoreFactory(final DslStoreSuppliers initialStoreSuppliers) {
          this.dslStoreSuppliers = initialStoreSuppliers;
      }
  
      @Override
      public void configure(final StreamsConfig config) {
          if (dslStoreSuppliers == null) {
              dslStoreSuppliers = config.getConfiguredInstance(
                  StreamsConfig.DSL_STORE_SUPPLIERS_CLASS_CONFIG,
                  DslStoreSuppliers.class,
                  config.originals()
              );
          }
      }
  
      @Override
      public Set<String> connectedProcessorNames() {
          return connectedProcessorNames;
      }
  
      protected DslStoreSuppliers dslStoreSuppliers() {
          if (dslStoreSuppliers == null) {
              throw new IllegalStateException("Expected configure() to be called before using dslStoreSuppliers");
          }
          return dslStoreSuppliers;
      }
  }
  