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    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  }