NumberPartitioner.java

/*
 * 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 com.facebook.presto.kafka.util;

import kafka.producer.Partitioner;
import kafka.utils.VerifiableProperties;

import static java.lang.Math.toIntExact;

public class NumberPartitioner
        implements Partitioner
{
    @SuppressWarnings("UnusedParameters")
    public NumberPartitioner(VerifiableProperties properties)
    {
        // constructor required by Kafka
    }

    @Override
    public int partition(Object key, int numPartitions)
    {
        if (key instanceof Number) {
            return toIntExact(((Number) key).longValue() % numPartitions);
        }
        return 0;
    }
}