com.metamx.common.MappedByteBufferHandler Maven / Gradle / Ivy
/*
* Copyright 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 java.io.File;
import java.nio.MappedByteBuffer;
/**
* Facilitates using try-with-resources with {@link MappedByteBuffer}s which don't implement {@link AutoCloseable}.
*
* This interface is a specialization of {@code io.druid.collections.ResourceHandler}.
* @see FileUtils#map(File)
*/
public final class MappedByteBufferHandler implements AutoCloseable
{
private final MappedByteBuffer mappedByteBuffer;
MappedByteBufferHandler(MappedByteBuffer mappedByteBuffer)
{
this.mappedByteBuffer = mappedByteBuffer;
}
/**
* Returns the wrapped buffer.
*/
public MappedByteBuffer get()
{
return mappedByteBuffer;
}
/**
* Unmaps the wrapped buffer.
*/
@Override
public void close()
{
ByteBufferUtils.unmap(mappedByteBuffer);
}
}