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 * http://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 /**
19 * The {@link RecvByteBufAllocator} that always yields the same buffer
20 * size prediction. This predictor ignores the feed back from the I/O thread.
21 */
22 public class FixedRecvByteBufAllocator extends DefaultMaxMessagesRecvByteBufAllocator {
23
24 private final int bufferSize;
25
26 private final class HandleImpl extends MaxMessageHandle {
27 private final int bufferSize;
28
29 public HandleImpl(int bufferSize) {
30 this.bufferSize = bufferSize;
31 }
32
33 @Override
34 public int guess() {
35 return bufferSize;
36 }
37 }
38
39 /**
40 * Creates a new predictor that always returns the same prediction of
41 * the specified buffer size.
42 */
43 public FixedRecvByteBufAllocator(int bufferSize) {
44 if (bufferSize <= 0) {
45 throw new IllegalArgumentException(
46 "bufferSize must greater than 0: " + bufferSize);
47 }
48 this.bufferSize = bufferSize;
49 }
50
51 @SuppressWarnings("deprecation")
52 @Override
53 public Handle newHandle() {
54 return new HandleImpl(bufferSize);
55 }
56
57 @Override
58 public FixedRecvByteBufAllocator respectMaybeMoreData(boolean respectMaybeMoreData) {
59 super.respectMaybeMoreData(respectMaybeMoreData);
60 return this;
61 }
62 }