org.apache.flink.streaming.connectors.pulsar.util.KeyHashMessageRouterImpl Maven / Gradle / Ivy
/*
* 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 org.apache.flink.streaming.connectors.pulsar.util;
import org.apache.flink.shaded.guava18.com.google.common.hash.Hashing;
import org.apache.pulsar.client.api.Message;
import org.apache.pulsar.client.api.MessageRouter;
import org.apache.pulsar.client.api.TopicMetadata;
/**
* a messageRouter that route message by key hash.
*/
public class KeyHashMessageRouterImpl implements MessageRouter {
public static final KeyHashMessageRouterImpl INSTANCE = new KeyHashMessageRouterImpl();
private KeyHashMessageRouterImpl() {
}
@Override
public int choosePartition(Message msg, TopicMetadata metadata) {
int hashing = Hashing.murmur3_32().hashBytes(msg.getKeyBytes()).asInt();
return Math.abs(hashing) % metadata.numPartitions();
}
}