src/main/java/geode/kafka/sink/GeodeKafkaSink.java

/*
 * 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 geode.kafka.sink;

import static geode.kafka.GeodeConnectorConfig.DEFAULT_LOCATOR;
import static geode.kafka.GeodeConnectorConfig.LOCATORS;
import static geode.kafka.GeodeSinkConnectorConfig.DEFAULT_NULL_VALUES_MEAN_REMOVE;
import static geode.kafka.GeodeSinkConnectorConfig.NULL_VALUES_MEAN_REMOVE;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import geode.kafka.GeodeConnectorConfig;
import org.apache.kafka.common.config.ConfigDef;
import org.apache.kafka.connect.connector.Task;
import org.apache.kafka.connect.sink.SinkConnector;

public class GeodeKafkaSink extends SinkConnector {
  private static final ConfigDef CONFIG_DEF = new ConfigDef();
  private Map<String, String> sharedProps;

  @Override
  public void start(Map<String, String> props) {
    sharedProps = computeMissingConfigurations(props);
  }

  @Override
  public Class<? extends Task> taskClass() {
    return GeodeKafkaSinkTask.class;
  }

  @Override
  public List<Map<String, String>> taskConfigs(int maxTasks) {
    List<Map<String, String>> taskConfigs = new ArrayList<>();

    // All tasks will build up the topic to regions map. A few might not use certain keys but we
    // have no control over partitioning in kafka and which tasks will fire
    for (int i = 0; i < maxTasks; i++) {
      Map<String, String> taskProps = new HashMap<>();
      taskProps.putAll(sharedProps);
      taskProps.put(GeodeConnectorConfig.TASK_ID, "" + i);
      taskConfigs.add(taskProps);
    }

    return taskConfigs;
  }

  @Override
  public void stop() {

  }

  @Override
  public ConfigDef config() {
    return CONFIG_DEF;
  }

  @Override
  public String version() {
    // TODO
    return "unknown";
  }


  private Map<String, String> computeMissingConfigurations(Map<String, String> props) {
    props.computeIfAbsent(LOCATORS, (key) -> DEFAULT_LOCATOR);
    props.computeIfAbsent(NULL_VALUES_MEAN_REMOVE, (key) -> DEFAULT_NULL_VALUES_MEAN_REMOVE);
    return props;
  }
}