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.tests;
  
  import org.apache.kafka.clients.consumer.ConsumerConfig;
  import org.apache.kafka.common.serialization.Serdes;
  import org.apache.kafka.common.utils.Exit;
  import org.apache.kafka.common.utils.Utils;
  import org.apache.kafka.streams.KafkaStreams;
  import org.apache.kafka.streams.StreamsBuilder;
  import org.apache.kafka.streams.StreamsConfig;
  import org.apache.kafka.streams.kstream.KStream;
  
  import java.util.Objects;
  import java.util.Properties;
  
  public class StaticMemberTestClient {
  
      private static final String TEST_NAME = "StaticMemberTestClient";
  
      @SuppressWarnings("unchecked")
      public static void main(final String[] args) throws Exception {
          if (args.length < 1) {
              System.err.println(TEST_NAME + " requires one argument (properties-file) but none provided: ");
          }
  
          System.out.println("StreamsTest instance started");
  
          final String propFileName = args[0];
  
          final Properties streamsProperties = Utils.loadProps(propFileName);
  
          final String groupInstanceId = Objects.requireNonNull(streamsProperties.getProperty(ConsumerConfig.GROUP_INSTANCE_ID_CONFIG));
  
          System.out.println(TEST_NAME + " instance started with group.instance.id " + groupInstanceId);
          System.out.println("props=" + streamsProperties);
          System.out.flush();
  
          final StreamsBuilder builder = new StreamsBuilder();
          final String inputTopic = (String) (Objects.requireNonNull(streamsProperties.remove("input.topic")));
  
          final KStream<String, String> dataStream = builder.stream(inputTopic);
          dataStream.peek((k, v) ->  System.out.printf("PROCESSED key=%s value=%s%n", k, v));
  
          final Properties config = new Properties();
          config.setProperty(StreamsConfig.APPLICATION_ID_CONFIG, TEST_NAME);
          config.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, 1000L);
          config.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.StringSerde.class);
          config.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.StringSerde.class);
  
          config.putAll(streamsProperties);
  
          final KafkaStreams streams = new KafkaStreams(builder.build(), config);
          streams.setStateListener((newState, oldState) -> {
              if (oldState == KafkaStreams.State.REBALANCING && newState == KafkaStreams.State.RUNNING) {
                  System.out.println("REBALANCING -> RUNNING");
                  System.out.flush();
              }
          });
  
          streams.start();
  
          Exit.addShutdownHook("streams-shutdown-hook", () -> {
              System.out.println("closing Kafka Streams instance");
              System.out.flush();
              streams.close();
              System.out.println("Static membership test closed");
              System.out.flush();
          });
      }
  }
  