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.connect.file;
  
  import org.apache.kafka.common.TopicPartition;
  import org.apache.kafka.common.config.AbstractConfig;
  import org.apache.kafka.common.config.ConfigDef;
  import org.apache.kafka.common.config.ConfigDef.Importance;
  import org.apache.kafka.common.config.ConfigDef.Type;
  import org.apache.kafka.common.utils.AppInfoParser;
  import org.apache.kafka.connect.connector.Task;
  import org.apache.kafka.connect.sink.SinkConnector;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  
  /**
   * Very simple sink connector that works with stdout or a file.
   */
  public class FileStreamSinkConnector extends SinkConnector {
  
      private static final Logger log = LoggerFactory.getLogger(FileStreamSinkConnector.class);
      public static final String FILE_CONFIG = "file";
      static final ConfigDef CONFIG_DEF = new ConfigDef()
          .define(FILE_CONFIG, Type.STRING, null, Importance.HIGH, "Destination filename. If not specified, the standard output will be used");
  
      private Map<String, String> props;
  
      @Override
      public String version() {
          return AppInfoParser.getVersion();
      }
  
      @Override
      public void start(Map<String, String> props) {
          this.props = props;
          AbstractConfig config = new AbstractConfig(CONFIG_DEF, props);
          String filename = config.getString(FILE_CONFIG);
          filename = (filename == null || filename.isEmpty()) ? "standard output" : filename;
          log.info("Starting file sink connector writing to {}", filename);
      }
  
      @Override
      public Class<? extends Task> taskClass() {
          return FileStreamSinkTask.class;
      }
  
      @Override
      public List<Map<String, String>> taskConfigs(int maxTasks) {
          ArrayList<Map<String, String>> configs = new ArrayList<>();
          for (int i = 0; i < maxTasks; i++) {
              configs.add(props);
          }
          return configs;
      }
  
      @Override
      public void stop() {
          // Nothing to do since FileStreamSinkConnector has no background monitoring.
      }
  
      @Override
      public ConfigDef config() {
          return CONFIG_DEF;
      }
  
      @Override
      public boolean alterOffsets(Map<String, String> connectorConfig, Map<TopicPartition, Long> offsets) {
          // Nothing to do here since FileStreamSinkConnector does not manage offsets externally nor does it require any
          // custom offset validation
          return true;
      }
  }
  