1 /*
2 * Copyright 2009 Red Hat, Inc.
3 *
4 * Red Hat licenses this file to you under the Apache License, version 2.0
5 * (the "License"); you may not use this file except in compliance with the
6 * 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 org.jboss.netty.channel;
17
18
19 /**
20 * The {@link ReceiveBufferSizePredictor} that always yields the same buffer
21 * size prediction. This predictor ignores the feed back from the I/O thread.
22 *
23 * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
24 * @author <a href="http://gleamynode.net/">Trustin Lee</a>
25 *
26 * @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
27 */
28 public class FixedReceiveBufferSizePredictor implements
29 ReceiveBufferSizePredictor {
30
31 private final int bufferSize;
32
33 /**
34 * Creates a new predictor that always returns the same prediction of
35 * the specified buffer size.
36 */
37 public FixedReceiveBufferSizePredictor(int bufferSize) {
38 if (bufferSize <= 0) {
39 throw new IllegalArgumentException(
40 "bufferSize must greater than 0: " + bufferSize);
41 }
42 this.bufferSize = bufferSize;
43 }
44
45 public int nextReceiveBufferSize() {
46 return bufferSize;
47 }
48
49 public void previousReceiveBufferSize(int previousReceiveBufferSize) {
50 // Ignore
51 }
52 }