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annotate src/org/eclipse/jetty/io/SimpleBuffers.java @ 840:0f53601ea489

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author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 19 Sep 2016 14:20:18 -0600
parents 3428c60d7cfc
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.io;
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20
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21 /* ------------------------------------------------------------ */
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22 /** SimpleBuffers.
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23 * Simple implementation of Buffers holder.
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24 *
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25 *
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26 */
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27 public class SimpleBuffers implements Buffers
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28 {
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29 final Buffer _header;
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30 final Buffer _buffer;
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31 boolean _headerOut;
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32 boolean _bufferOut;
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33
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34 /* ------------------------------------------------------------ */
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35 /**
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36 *
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37 */
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38 public SimpleBuffers(Buffer header, Buffer buffer)
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39 {
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40 _header=header;
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41 _buffer=buffer;
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42 }
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43
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44 /* ------------------------------------------------------------ */
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45 public Buffer getBuffer()
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46 {
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47 synchronized(this)
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48 {
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49 if (_buffer!=null && !_bufferOut)
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50 {
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51 _bufferOut=true;
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52 return _buffer;
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53 }
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54
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55 if (_buffer!=null && _header!=null && _header.capacity()==_buffer.capacity() && !_headerOut)
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56 {
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57 _headerOut=true;
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58 return _header;
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59 }
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60
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61 if (_buffer!=null)
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62 return new ByteArrayBuffer(_buffer.capacity());
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63 return new ByteArrayBuffer(4096);
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64 }
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65 }
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66
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67 /* ------------------------------------------------------------ */
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68 public Buffer getHeader()
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69 {
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70 synchronized(this)
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71 {
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72 if (_header!=null && !_headerOut)
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73 {
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74 _headerOut=true;
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75 return _header;
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76 }
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77
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78 if (_buffer!=null && _header!=null && _header.capacity()==_buffer.capacity() && !_bufferOut)
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79 {
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80 _bufferOut=true;
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81 return _buffer;
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82 }
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83
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84 if (_header!=null)
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85 return new ByteArrayBuffer(_header.capacity());
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86 return new ByteArrayBuffer(4096);
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87 }
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88 }
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89
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90 /* ------------------------------------------------------------ */
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91 public Buffer getBuffer(int size)
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92 {
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93 synchronized(this)
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94 {
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95 if (_header!=null && _header.capacity()==size)
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96 return getHeader();
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97 if (_buffer!=null && _buffer.capacity()==size)
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98 return getBuffer();
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99 return null;
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100 }
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101 }
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102
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103 /* ------------------------------------------------------------ */
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104 public void returnBuffer(Buffer buffer)
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105 {
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106 synchronized(this)
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107 {
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108 buffer.clear();
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109 if (buffer==_header)
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110 _headerOut=false;
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111 if (buffer==_buffer)
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112 _bufferOut=false;
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113 }
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114 }
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115
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116
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117 }