/**
 * 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.pulsar.client.kafka.compat;

import java.util.concurrent.ThreadLocalRandom;

import org.apache.pulsar.client.api.HashingScheme;
import org.apache.pulsar.client.api.Message;
import org.apache.pulsar.client.api.TopicMetadata;
import org.apache.pulsar.client.impl.RoundRobinPartitionMessageRouterImpl;

public class KafkaMessageRouter extends RoundRobinPartitionMessageRouterImpl {

    public static final String PARTITION_ID = "pulsar.partition.id";

    public KafkaMessageRouter(long maxBatchingDelayMs) {
        super(HashingScheme.JavaStringHash, ThreadLocalRandom.current().nextInt(), true, maxBatchingDelayMs);
    }

    @Override
    public int choosePartition(Message<?> msg, TopicMetadata metadata) {
        if (msg.hasProperty(PARTITION_ID)) {
            return Integer.parseInt(msg.getProperty(PARTITION_ID));
        } else {
            return super.choosePartition(msg, metadata);
        }
    }
}
