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    1   /*
    2    *  Licensed to the Apache Software Foundation (ASF) under one
    3    *  or more contributor license agreements.  See the NOTICE file
    4    *  distributed with this work for additional information
    5    *  regarding copyright ownership.  The ASF licenses this file
    6    *  to you under the Apache License, Version 2.0 (the
    7    *  "License"); you may not use this file except in compliance
    8    *  with the License.  You may obtain a copy of the License at
    9    *
    10   *    http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   *  Unless required by applicable law or agreed to in writing,
    13   *  software distributed under the License is distributed on an
    14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   *  KIND, either express or implied.  See the License for the
    16   *  specific language governing permissions and limitations
    17   *  under the License.
    18   *
    19   */
    20  package org.apache.mina.filter.buffer;
    21
    22  import org.apache.mina.core.buffer.IoBuffer;
    23  import org.apache.mina.util.LazyInitializer;
    24
    25  /**
    26   * An {@link LazyInitializer} implementation that initializes an
    27   * {@link IoBuffer} only when needed.
    28   *
    29   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
    30   * @since MINA 2.0.0-M2
    31   */
    32  public class IoBufferLazyInitializer extends LazyInitializer<IoBuffer> {
    33
    34      /**
    35       * The buffer size allocated for each new session's buffer.
    36       */
    37      private int bufferSize;
    38
    39      /**
    40       * Constructor which sets allocated buffer size to <code>bufferSize</code>.
    41       *
    42       * @param bufferSize the new buffer size
    43       */
    44      public IoBufferLazyInitializer(int bufferSize) {
    45          this.bufferSize = bufferSize;
    46      }
    47
    48      /**
    49       * {@inheritDoc}
    50       */
    51      public IoBuffer init() {
    52          return IoBuffer.allocate(bufferSize);
    53      }
    54  }