com.metamx.common.ByteBufferUtils Maven / Gradle / Ivy
/*
* Copyright 2011-2016 Metamarkets Group Inc.
*
* 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 com.metamx.common;
import sun.misc.Cleaner;
import sun.nio.ch.DirectBuffer;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
/**
*/
public class ByteBufferUtils
{
/**
* Releases memory held by the given direct ByteBuffer
*
* @param buffer buffer to free
*/
public static void free(ByteBuffer buffer)
{
if (buffer.isDirect()) {
clean((DirectBuffer) buffer);
}
}
/**
* Un-maps the given memory mapped file
*
* @param buffer buffer
*/
public static void unmap(MappedByteBuffer buffer)
{
free(buffer);
}
private static void clean(DirectBuffer buffer)
{
final Cleaner cleaner = buffer.cleaner();
if (cleaner != null) {
cleaner.clean();
}
}
}