org.apache.cassandra.utils.memory.AbstractAllocator Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of cassandra-all Show documentation

A fork of the Apache Cassandra Project that uses Lucene indexes for providing near real time search such as ElasticSearch or Solr, including full text search capabilities, multi-dimensional queries, and relevance scoring.

The newest version!

/*
 * 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.utils.memory;

import java.nio.ByteBuffer;

import org.apache.cassandra.utils.ByteBufferUtil;

public abstract class AbstractAllocator
{
    /**
     * Allocate a slice of the given length.
     */
    public ByteBuffer clone(ByteBuffer buffer)
    {
        assert buffer != null;
        if (buffer.remaining() == 0)
            return ByteBufferUtil.EMPTY_BYTE_BUFFER;
        ByteBuffer cloned = allocate(buffer.remaining());

        cloned.mark();
        cloned.put(buffer.duplicate());
        cloned.reset();
        return cloned;
    }

    public abstract ByteBuffer allocate(int size);
}