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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  }