]>
Commit | Line | Data |
---|---|---|
1d09f67e TL |
1 | /* |
2 | * Licensed to the Apache Software Foundation (ASF) under one or more | |
3 | * contributor license agreements. See the NOTICE file distributed with | |
4 | * this work for additional information regarding copyright ownership. | |
5 | * The ASF licenses this file to You under the Apache License, Version 2.0 | |
6 | * (the "License"); you may not use this file except in compliance with | |
7 | * the License. You may obtain a copy of the License at | |
8 | * | |
9 | * http://www.apache.org/licenses/LICENSE-2.0 | |
10 | * | |
11 | * Unless required by applicable law or agreed to in writing, software | |
12 | * distributed under the License is distributed on an "AS IS" BASIS, | |
13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
14 | * See the License for the specific language governing permissions and | |
15 | * limitations under the License. | |
16 | */ | |
17 | ||
18 | package io.netty.buffer; | |
19 | ||
20 | import org.apache.arrow.memory.BufferAllocator; | |
21 | ||
22 | /** | |
23 | * Allows us to decorate ArrowBuf to make it expandable so that we can use them in the context of | |
24 | * the Netty framework | |
25 | * (thus supporting RPC level memory accounting). | |
26 | */ | |
27 | public class ExpandableByteBuf extends MutableWrappedByteBuf { | |
28 | ||
29 | private final BufferAllocator allocator; | |
30 | ||
31 | public ExpandableByteBuf(ByteBuf buffer, BufferAllocator allocator) { | |
32 | super(buffer); | |
33 | this.allocator = allocator; | |
34 | } | |
35 | ||
36 | @Override | |
37 | public ByteBuf copy(int index, int length) { | |
38 | return new ExpandableByteBuf(buffer.copy(index, length), allocator); | |
39 | } | |
40 | ||
41 | @Override | |
42 | public ByteBuf capacity(int newCapacity) { | |
43 | if (newCapacity > capacity()) { | |
44 | ByteBuf newBuf = NettyArrowBuf.unwrapBuffer(allocator.buffer(newCapacity)); | |
45 | newBuf.writeBytes(buffer, 0, buffer.capacity()); | |
46 | newBuf.readerIndex(buffer.readerIndex()); | |
47 | newBuf.writerIndex(buffer.writerIndex()); | |
48 | buffer.release(); | |
49 | buffer = newBuf; | |
50 | return newBuf; | |
51 | } else { | |
52 | return super.capacity(newCapacity); | |
53 | } | |
54 | } | |
55 | ||
56 | } |