1 /*
2 * Copyright 2012 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. You may obtain a copy of the License at:
7 *
8 * https://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16 package io.netty.channel;
17
18 import static io.netty.util.internal.ObjectUtil.checkPositive;
19
20 /**
21 * The {@link RecvByteBufAllocator} that always yields the same buffer
22 * size prediction. This predictor ignores the feed back from the I/O thread.
23 */
24 public class FixedRecvByteBufAllocator extends DefaultMaxMessagesRecvByteBufAllocator {
25
26 private final int bufferSize;
27
28 private final class HandleImpl extends MaxMessageHandle {
29 private final int bufferSize;
30
31 HandleImpl(int bufferSize) {
32 this.bufferSize = bufferSize;
33 }
34
35 @Override
36 public int guess() {
37 return bufferSize;
38 }
39 }
40
41 /**
42 * Creates a new predictor that always returns the same prediction of
43 * the specified buffer size.
44 */
45 public FixedRecvByteBufAllocator(int bufferSize) {
46 checkPositive(bufferSize, "bufferSize");
47 this.bufferSize = bufferSize;
48 }
49
50 @SuppressWarnings("deprecation")
51 @Override
52 public Handle newHandle() {
53 return new HandleImpl(bufferSize);
54 }
55
56 @Override
57 public FixedRecvByteBufAllocator respectMaybeMoreData(boolean respectMaybeMoreData) {
58 super.respectMaybeMoreData(respectMaybeMoreData);
59 return this;
60 }
61 }