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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 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  public class FixedReceiveBufferSizePredictor implements
24          ReceiveBufferSizePredictor {
25  
26      private final int bufferSize;
27  
28      /**
29       * Creates a new predictor that always returns the same prediction of
30       * the specified buffer size.
31       */
32      public FixedReceiveBufferSizePredictor(int bufferSize) {
33          if (bufferSize <= 0) {
34              throw new IllegalArgumentException(
35                      "bufferSize must greater than 0: " + bufferSize);
36          }
37          this.bufferSize = bufferSize;
38      }
39  
40      public int nextReceiveBufferSize() {
41          return bufferSize;
42      }
43  
44      public void previousReceiveBufferSize(int previousReceiveBufferSize) {
45          // Ignore
46      }
47  }