org.apache.bookkeeper.common.router.AbstractHashRouter Maven / Gradle / Ivy
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* 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,
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*/
package org.apache.bookkeeper.common.router;
import io.netty.buffer.ByteBuf;
import io.netty.util.ReferenceCountUtil;
import org.apache.bookkeeper.common.hash.Murmur3;
/**
* The base hash router.
*/
public abstract class AbstractHashRouter implements HashRouter {
private static final long serialVersionUID = -7979076779920023308L;
public static final long HASH_SEED = 383242705L;
protected AbstractHashRouter() {
}
@Override
public Long getRoutingKey(K key) {
ByteBuf keyData = getRoutingKeyData(key);
try {
return Murmur3.hash128(
keyData, keyData.readerIndex(), keyData.readableBytes(), HASH_SEED)[0];
} finally {
ReferenceCountUtil.release(keyData);
}
}
abstract ByteBuf getRoutingKeyData(K key);
}