| /* |
| * 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.db.Clustering; |
| import org.apache.cassandra.db.Columns; |
| import org.apache.cassandra.db.rows.BTreeRow; |
| import org.apache.cassandra.db.rows.Cell; |
| import org.apache.cassandra.db.rows.Row; |
| 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); |
| |
| public Row.Builder cloningBTreeRowBuilder() |
| { |
| return new CloningBTreeRowBuilder(this); |
| } |
| |
| private static class CloningBTreeRowBuilder extends BTreeRow.Builder |
| { |
| private final AbstractAllocator allocator; |
| |
| private CloningBTreeRowBuilder(AbstractAllocator allocator) |
| { |
| super(true); |
| this.allocator = allocator; |
| } |
| |
| @Override |
| public void newRow(Clustering clustering) |
| { |
| super.newRow(clustering.copy(allocator)); |
| } |
| |
| @Override |
| public void addCell(Cell cell) |
| { |
| super.addCell(cell.copy(allocator)); |
| } |
| } |
| } |