View Javadoc

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  }