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/*
 * Copyright © 2018 Cask Data, Inc.
 *
 * Licensed 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 io.cdap.plugin.kafka.sink;

import com.google.common.hash.Hashing;
import org.apache.kafka.clients.producer.Partitioner;
import org.apache.kafka.common.Cluster;
import org.apache.kafka.common.PartitionInfo;

import java.util.List;
import java.util.Map;

/**
 * String partitioner for kafka
 */
@SuppressWarnings("UnusedDeclaration")
public final class StringPartitioner implements Partitioner {

  @Override
  public int partition(String topic, Object key, byte[] keyBytes, Object value, byte[] valueBytes, Cluster cluster) {
    List partitions = cluster.partitionsForTopic(topic);
    int numPartitions = partitions.size();
    return Math.abs(Hashing.md5().hashString(key.toString()).asInt()) % numPartitions;
  }

  @Override
  public void close() {
  }

  @Override
  public void configure(Map map) {
  }
}