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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 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  }