/*
* 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.cassandra.io.util;
public interface DiskOptimizationStrategy
{
// The maximum buffer size, we will never buffer more than this size. Further,
// when the limiter is not null, i.e. when throttling is enabled, we read exactly
// this size, since when throttling the intention is to eventually read everything,
// see CASSANDRA-8630
// NOTE: this size is chosen both for historical consistency, as a reasonable upper bound,
// and because our BufferPool currently has a maximum allocation size of this.
int MAX_BUFFER_SIZE = 1 << 16; // 64k
/**
* @param recordSize record size
* @return the buffer size for a given record size.
*/
int bufferSize(long recordSize);
/**
* Round up to the next multiple of 4k but no more than {@link #MAX_BUFFER_SIZE}.
*/
default int roundBufferSize(long size)
{
if (size <= 0)
return 4096;
size = (size + 4095) & ~4095;
return (int)Math.min(size, MAX_BUFFER_SIZE);
}
}