io.druid.java.util.common.MappedByteBufferHandler 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 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
*/
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);
}
}