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annotate src/org/eclipse/jetty/io/PooledBuffers.java @ 1006:58a9c4a42292

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simplify Buffers code
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 23 Oct 2016 17:21:20 -0600
parents 3428c60d7cfc
children c3a04bded909
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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 import java.util.Queue;
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22 import java.util.concurrent.ConcurrentLinkedQueue;
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23 import java.util.concurrent.atomic.AtomicInteger;
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24
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25 public final class PooledBuffers extends AbstractBuffers
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26 {
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27 private final Queue<Buffer> _headers;
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28 private final Queue<Buffer> _buffers;
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29 private final Queue<Buffer> _others;
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30 private final AtomicInteger _size = new AtomicInteger();
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31 private final int _maxSize;
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32 private final boolean _otherHeaders;
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33
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34 public PooledBuffers(Buffers.Type headerType, int headerSize, Buffers.Type bufferType, int bufferSize,int maxSize)
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35 {
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36 super(headerType,headerSize,bufferType,bufferSize);
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37 _headers=new ConcurrentLinkedQueue<Buffer>();
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38 _buffers=new ConcurrentLinkedQueue<Buffer>();
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39 _others=new ConcurrentLinkedQueue<Buffer>();
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40 _otherHeaders=headerType==bufferType;
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41 _maxSize=maxSize;
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42 }
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43
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44 public Buffer getHeader()
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45 {
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46 Buffer buffer = _headers.poll();
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47 if (buffer==null)
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48 buffer=newHeader();
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49 else
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50 _size.decrementAndGet();
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51 return buffer;
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52 }
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53
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54 public Buffer getBuffer()
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55 {
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56 Buffer buffer = _buffers.poll();
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57 if (buffer==null)
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58 buffer=newBuffer();
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59 else
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60 _size.decrementAndGet();
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61 return buffer;
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62 }
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63
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64 /* ------------------------------------------------------------ */
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65 public Buffer getBuffer(int size)
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66 {
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67 if (_otherHeaders && size==getHeaderSize())
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68 return getHeader();
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69 if (size==getBufferSize())
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70 return getBuffer();
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71
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72 // Look for an other buffer
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73 Buffer buffer = _others.poll();
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74
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75 // consume all other buffers until one of the right size is found
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76 while (buffer!=null && buffer.capacity()!=size)
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77 {
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78 _size.decrementAndGet();
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79 buffer = _others.poll();
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80 }
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81
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82 if (buffer==null)
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83 buffer=newBuffer(size);
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84 else
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85 _size.decrementAndGet();
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86 return buffer;
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87 }
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88
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89 /* ------------------------------------------------------------ */
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90 public void returnBuffer(Buffer buffer)
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91 {
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92 buffer.clear();
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93 if (buffer.isVolatile() || buffer.isImmutable())
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94 return;
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95
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96 if (_size.incrementAndGet() > _maxSize)
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97 _size.decrementAndGet();
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98 else
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99 {
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100 if (isHeader(buffer))
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101 _headers.add(buffer);
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102 else if (isBuffer(buffer))
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103 _buffers.add(buffer);
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104 else
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105 _others.add(buffer);
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106 }
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107 }
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108
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109 public String toString()
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110 {
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111 return String.format("%s [%d/%d@%d,%d/%d@%d,%d/%d@-]",
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112 getClass().getSimpleName(),
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113 _headers.size(),_maxSize,_headerSize,
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114 _buffers.size(),_maxSize,_bufferSize,
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115 _others.size(),_maxSize);
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116 }
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117 }