View Javadoc

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  }