io.druid.java.util.common.ByteBufferUtils Maven / Gradle / Ivy
/*
* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets 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 io.druid.java.util.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();
}
}
}