https://github.com/Terracotta-OSS/offheap-store/: A library that offers data structures allocated off the java heap. 
/* 
 * Copyright 2015 Terracotta, Inc., a Software AG company.
 *
 * 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 org.terracotta.offheapstore.buffersource;

import java.nio.ByteBuffer;


A source of NIO buffers of some type.

Author:Chris Dennis
/**
 * A source of NIO buffers of some type.
 * 
 * @author Chris Dennis
 */
public interface BufferSource {

  
Allocates a buffer of the given size.

 If a suitable buffer cannot be allocated then null should be returned. Implementations may place restrictions on the valid size value they will accept. 
Params:
  • size – required buffer size
Returns:a buffer of the required size
/**
   * Allocates a buffer of the given size.
   * <p>
   * If a suitable buffer cannot be allocated then {@code null} should be
   * returned.  Implementations may place restrictions on the valid size value
   * they will accept.
   *
   * @param size required buffer size
   * @return a buffer of the required size
   */
   ByteBuffer allocateBuffer(int size);
}