org.apache.pulsar.client.impl.SinglePartitionMessageRouterImpl Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
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* 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
*
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package org.apache.pulsar.client.impl;
import static org.apache.pulsar.client.util.MathUtils.signSafeMod;
import org.apache.pulsar.client.api.HashingScheme;
import org.apache.pulsar.client.api.Message;
import org.apache.pulsar.client.api.TopicMetadata;
public class SinglePartitionMessageRouterImpl extends MessageRouterBase {
private static final long serialVersionUID = 1L;
private final int partitionIndex;
public SinglePartitionMessageRouterImpl(int partitionIndex, HashingScheme hashingScheme) {
super(hashingScheme);
this.partitionIndex = partitionIndex;
}
@Override
public int choosePartition(Message msg, TopicMetadata metadata) {
// If the message has a key, it supersedes the single partition routing policy
if (msg.hasKey()) {
return signSafeMod(hash.makeHash(msg.getKey()), metadata.numPartitions());
}
return partitionIndex;
}
}