/* This file is part of VoltDB.
* Copyright (C) 2008-2017 VoltDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with VoltDB. If not, see <http://www.gnu.org/licenses/>.
*/
package org.voltdb.utils;
import java.nio.ByteBuffer;
/**
* A ByteBuffer allocator that caches the buffer and reuse it in the future. If the cached buffer
* is smaller than the requested size, it will replace the cached buffer with a new buffer that
* fits the size.
*
* Note: this class is not thread-safe.
*/
public class CachedByteBufferAllocator {
private ByteBuffer m_buffer = null;
public ByteBuffer allocate(int size) {
if (m_buffer == null || m_buffer.capacity() < size) {
m_buffer = ByteBuffer.allocate(size);
}
m_buffer.clear();
m_buffer.limit(size);
return m_buffer;
}
}