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annotate src/org/eclipse/jetty/http/gzip/AbstractCompressedStream.java @ 889:5731a7707466

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author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 06 Oct 2016 23:24:30 -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.http.gzip;
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20
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21 import java.io.IOException;
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22 import java.io.OutputStream;
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23 import java.io.OutputStreamWriter;
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24 import java.io.PrintWriter;
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25 import java.io.UnsupportedEncodingException;
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26 import java.util.zip.DeflaterOutputStream;
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27
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28 import javax.servlet.ServletOutputStream;
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29 import javax.servlet.http.HttpServletRequest;
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30 import javax.servlet.http.HttpServletResponse;
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31
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32 import org.eclipse.jetty.util.ByteArrayOutputStream2;
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33
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34 /* ------------------------------------------------------------ */
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35 /**
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36 * Skeletal implementation of a CompressedStream. This class adds compression features to a ServletOutputStream and takes care of setting response headers, etc.
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37 * Major work and configuration is done here. Subclasses using different kinds of compression only have to implement the abstract methods doCompress() and
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38 * setContentEncoding() using the desired compression and setting the appropriate Content-Encoding header string.
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39 */
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40 public abstract class AbstractCompressedStream extends ServletOutputStream
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41 {
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42 private final String _encoding;
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43 protected final String _vary;
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44 protected final CompressedResponseWrapper _wrapper;
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45 protected final HttpServletResponse _response;
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46 protected OutputStream _out;
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47 protected ByteArrayOutputStream2 _bOut;
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48 protected DeflaterOutputStream _compressedOutputStream;
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49 protected boolean _closed;
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50 protected boolean _doNotCompress;
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51
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52 /**
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53 * Instantiates a new compressed stream.
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54 *
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55 */
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56 public AbstractCompressedStream(String encoding,HttpServletRequest request, CompressedResponseWrapper wrapper,String vary)
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57 throws IOException
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58 {
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59 _encoding=encoding;
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60 _wrapper = wrapper;
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61 _response = (HttpServletResponse)wrapper.getResponse();
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62 _vary=vary;
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63
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64 if (_wrapper.getMinCompressSize()==0)
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65 doCompress();
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66 }
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67
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68 /* ------------------------------------------------------------ */
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69 /**
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70 * Reset buffer.
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71 */
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72 public void resetBuffer()
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73 {
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74 if (_response.isCommitted() || _compressedOutputStream!=null )
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75 throw new IllegalStateException("Committed");
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76 _closed = false;
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77 _out = null;
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78 _bOut = null;
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79 _doNotCompress = false;
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80 }
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81
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82 /* ------------------------------------------------------------ */
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83 public void setBufferSize(int bufferSize)
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84 {
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85 if (_bOut!=null && _bOut.getBuf().length<bufferSize)
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86 {
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87 ByteArrayOutputStream2 b = new ByteArrayOutputStream2(bufferSize);
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88 b.write(_bOut.getBuf(),0,_bOut.size());
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89 _bOut=b;
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90 }
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91 }
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92
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93 /* ------------------------------------------------------------ */
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94 public void setContentLength()
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95 {
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96 if (_doNotCompress)
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97 {
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98 long length=_wrapper.getContentLength();
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99 if (length>=0)
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100 {
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101 if (length < Integer.MAX_VALUE)
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102 _response.setContentLength((int)length);
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103 else
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104 _response.setHeader("Content-Length",Long.toString(length));
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105 }
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106 }
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107 }
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108
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109 /* ------------------------------------------------------------ */
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110 /**
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111 * @see java.io.OutputStream#flush()
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112 */
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113 @Override
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114 public void flush() throws IOException
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115 {
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116 if (_out == null || _bOut != null)
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117 {
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118 long length=_wrapper.getContentLength();
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119 if (length > 0 && length < _wrapper.getMinCompressSize())
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120 doNotCompress(false);
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121 else
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122 doCompress();
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123 }
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124
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125 _out.flush();
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126 }
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127
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128 /* ------------------------------------------------------------ */
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129 /**
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130 * @see java.io.OutputStream#close()
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131 */
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132 @Override
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133 public void close() throws IOException
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134 {
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135 if (_closed)
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136 return;
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137
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138 if (_wrapper.getRequest().getAttribute("javax.servlet.include.request_uri") != null)
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139 flush();
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140 else
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141 {
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142 if (_bOut != null)
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143 {
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144 long length=_wrapper.getContentLength();
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145 if (length < 0)
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146 {
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147 length = _bOut.getCount();
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148 _wrapper.setContentLength(length);
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149 }
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150 if (length < _wrapper.getMinCompressSize())
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151 doNotCompress(false);
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152 else
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153 doCompress();
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154 }
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155 else if (_out == null)
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156 {
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157 // No output
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158 doNotCompress(false);
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159 }
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160
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161 if (_compressedOutputStream != null)
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162 _compressedOutputStream.close();
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163 else
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164 _out.close();
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165 _closed = true;
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166 }
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167 }
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168
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169 /**
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170 * Finish.
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171 *
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172 * @throws IOException
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173 * Signals that an I/O exception has occurred.
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174 */
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175 public void finish() throws IOException
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176 {
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177 if (!_closed)
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178 {
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179 if (_out == null || _bOut != null)
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180 {
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181 long length=_wrapper.getContentLength();
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182 if (length >= 0 && length < _wrapper.getMinCompressSize())
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183 doNotCompress(false);
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184 else
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185 doCompress();
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186 }
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187
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188 if (_compressedOutputStream != null && !_closed)
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189 {
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190 _closed = true;
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191 _compressedOutputStream.close();
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192 }
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193 }
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194 }
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195
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196 /* ------------------------------------------------------------ */
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197 /**
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198 * @see java.io.OutputStream#write(int)
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199 */
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200 @Override
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201 public void write(int b) throws IOException
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202 {
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203 checkOut(1);
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204 _out.write(b);
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205 }
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206
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207 /* ------------------------------------------------------------ */
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208 /**
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209 * @see java.io.OutputStream#write(byte[])
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210 */
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211 @Override
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212 public void write(byte b[]) throws IOException
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213 {
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214 checkOut(b.length);
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215 _out.write(b);
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216 }
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217
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218 /* ------------------------------------------------------------ */
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219 /**
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220 * @see java.io.OutputStream#write(byte[], int, int)
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221 */
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222 @Override
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223 public void write(byte b[], int off, int len) throws IOException
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224 {
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225 checkOut(len);
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226 _out.write(b,off,len);
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227 }
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228
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229 /**
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230 * Do compress.
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231 *
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232 * @throws IOException Signals that an I/O exception has occurred.
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233 */
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234 public void doCompress() throws IOException
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235 {
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236 if (_compressedOutputStream==null)
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237 {
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238 if (_response.isCommitted())
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239 throw new IllegalStateException();
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240
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241 if (_encoding!=null)
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242 {
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243 setHeader("Content-Encoding", _encoding);
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244 if (_response.containsHeader("Content-Encoding"))
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245 {
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246 addHeader("Vary",_vary);
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247 _out=_compressedOutputStream=createStream();
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248 if (_out!=null)
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249 {
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250 if (_bOut!=null)
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251 {
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252 _out.write(_bOut.getBuf(),0,_bOut.getCount());
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253 _bOut=null;
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254 }
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255
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256 String etag=_wrapper.getETag();
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257 if (etag!=null)
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258 setHeader("ETag",etag.substring(0,etag.length()-1)+'-'+_encoding+'"');
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259 return;
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260 }
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261 }
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262 }
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263
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264 doNotCompress(true); // Send vary as it could have been compressed if encoding was present
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265 }
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266 }
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267
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268 /**
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269 * Do not compress.
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270 *
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271 * @throws IOException
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272 * Signals that an I/O exception has occurred.
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273 */
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274 public void doNotCompress(boolean sendVary) throws IOException
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275 {
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276 if (_compressedOutputStream != null)
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277 throw new IllegalStateException("Compressed output stream is already assigned.");
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278 if (_out == null || _bOut != null)
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279 {
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280 if (sendVary)
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281 addHeader("Vary",_vary);
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282 if (_wrapper.getETag()!=null)
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283 setHeader("ETag",_wrapper.getETag());
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284
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285 _doNotCompress = true;
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286
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287 _out = _response.getOutputStream();
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288 setContentLength();
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289
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290 if (_bOut != null)
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291 _out.write(_bOut.getBuf(),0,_bOut.getCount());
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292 _bOut = null;
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293 }
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294 }
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295
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296 /**
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297 * Check out.
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298 *
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299 * @param lengthToWrite
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300 * the length
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301 * @throws IOException
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302 * Signals that an I/O exception has occurred.
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303 */
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304 private void checkOut(int lengthToWrite) throws IOException
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305 {
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306 if (_closed)
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307 throw new IOException("CLOSED");
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308
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309 if (_out == null)
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310 {
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311 // If this first write is larger than buffer size, then we are committing now
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312 if (lengthToWrite>_wrapper.getBufferSize())
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313 {
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314 // if we know this is all the content and it is less than minimum, then do not compress, otherwise do compress
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315 long length=_wrapper.getContentLength();
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316 if (length>=0 && length<_wrapper.getMinCompressSize())
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317 doNotCompress(false); // Not compressing by size, so no vary on request headers
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318 else
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319 doCompress();
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320 }
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321 else
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322 {
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323 // start aggregating writes into a buffered output stream
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324 _out = _bOut = new ByteArrayOutputStream2(_wrapper.getBufferSize());
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325 }
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326 }
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327 // else are we aggregating writes?
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328 else if (_bOut !=null)
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329 {
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330 // We are aggregating into the buffered output stream.
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331
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332 // If this write fills the buffer, then we are committing
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333 if (lengthToWrite>=(_bOut.getBuf().length - _bOut.getCount()))
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334 {
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335 // if we know this is all the content and it is less than minimum, then do not compress, otherwise do compress
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336 long length=_wrapper.getContentLength();
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337 if (length>=0 && length<_wrapper.getMinCompressSize())
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diff changeset
338 doNotCompress(false); // Not compressing by size, so no vary on request headers
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339 else
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340 doCompress();
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341 }
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342 }
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343 }
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344
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345 /**
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346 * @see org.eclipse.jetty.http.gzip.CompressedStream#getOutputStream()
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347 */
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348 public OutputStream getOutputStream()
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349 {
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350 return _out;
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351 }
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352
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353 /**
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354 * @see org.eclipse.jetty.http.gzip.CompressedStream#isClosed()
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355 */
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356 public boolean isClosed()
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357 {
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358 return _closed;
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359 }
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360
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361 /**
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362 * Allows derived implementations to replace PrintWriter implementation.
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363 */
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364 protected PrintWriter newWriter(OutputStream out, String encoding) throws UnsupportedEncodingException
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365 {
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366 return encoding == null?new PrintWriter(out):new PrintWriter(new OutputStreamWriter(out,encoding));
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367 }
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368
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369 protected void addHeader(String name,String value)
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370 {
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371 _response.addHeader(name, value);
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372 }
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373
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374 protected void setHeader(String name,String value)
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375 {
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376 _response.setHeader(name, value);
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377 }
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378
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379 /**
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380 * Create the stream fitting to the underlying compression type.
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381 *
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382 * @throws IOException
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383 * Signals that an I/O exception has occurred.
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384 */
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385 protected abstract DeflaterOutputStream createStream() throws IOException;
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386
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387
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388 }