DefaultPartitioner.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 io.jafka.producer;


import java.util.Random;

import io.jafka.common.annotations.ClientSide;

/**
 * @author adyliu (imxylz@gmail.com)
 * @since 1.0
 */
@ClientSide
public class DefaultPartitioner<T> implements Partitioner<T> {

    private final Random random = new Random();

    public int partition(T key, int numPartitions) {
        if (key == null) {
            return random.nextInt(numPartitions);
        }
        return Math.abs(key.hashCode()) % numPartitions;
    }

}