examples/camel-example-vertx-kafka/src/main/java/org/apache/camel/example/vertx/kafka/StringPartitioner.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 org.apache.camel.example.vertx.kafka;

import java.util.Map;

import org.apache.kafka.clients.producer.Partitioner;
import org.apache.kafka.common.Cluster;

public class StringPartitioner implements Partitioner {

    public StringPartitioner() {
        // noop
    }

    @Override
    public void configure(Map<String, ?> configs) {
    }

    @Override
    public int partition(String topic, Object key, byte[] keyBytes, Object value, byte[] valueBytes, Cluster cluster) {
        int partId = 0;

        if (key instanceof String) {
            String sKey = (String) key;
            int len = sKey.length();

            // This will return either 1 or zero
            partId = len % 2;
        }

        return partId;
    }

    @Override
    public void close() {
    }

}