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.graph;
  
  import org.apache.kafka.streams.kstream.internals.KTableValueGetterSupplier;
  import org.apache.kafka.streams.processor.ConnectedStoreProvider;
  import org.apache.kafka.streams.processor.internals.InternalTopologyBuilder;
  
  import java.util.Arrays;
  import java.util.Set;
  
  /**
   * Used for stateful processors that need to be manually connected to the state store(s)
   * they need to access. This should only be used in cases where the stores) cannot
   * be connected automatically by implementing the {@link ConnectedStoreProvider#stores()} method
   * and returning the store directly. Generally this will only apply to DSL operators that utilize
   * value getters to access another processor's state store(s), and the process/processValues
   * operator where the user's custom processor supplier doesn't implement the #stores method
   * and has to be connected to the store when compiling the topology.
   */
  public class ProcessorToStateConnectorNode<K, V> extends ProcessorGraphNode<K, V> {
  
      private final String[] storeNames;
  
      /**
       * Create a node representing a stateful processor that uses value getters to access stores, and needs to
       * be connected with those stores
       */
      public ProcessorToStateConnectorNode(final ProcessorParameters<K, V, ?, ?> processorParameters,
                                           final Set<KTableValueGetterSupplier<?, ?>> valueGetterSuppliers) {
          super(processorParameters.processorName(), processorParameters);
          storeNames = valueGetterSuppliers.stream().flatMap(s -> Arrays.stream(s.storeNames())).toArray(String[]::new);
      }
  
      /**
       * Create a node representing a stateful processor, which needs to be connected to the provided stores
       */
      public ProcessorToStateConnectorNode(final String nodeName,
                                           final ProcessorParameters<K, V, ?, ?> processorParameters,
                                           final String[] storeNames) {
          super(nodeName, processorParameters);
          this.storeNames = storeNames;
      }
  
      @Override
      public String toString() {
          return "ProcessorNode{" +
              "storeNames=" + Arrays.toString(storeNames) +
              "} " + super.toString();
      }
  
      @Override
      public void writeToTopology(final InternalTopologyBuilder topologyBuilder) {
          processorParameters().addProcessorTo(topologyBuilder, parentNodeNames());
  
          if (storeNames != null && storeNames.length > 0) {
              topologyBuilder.connectProcessorAndStateStores(processorParameters().processorName(), storeNames);
          }
      }
  }
  