Mercurial > SimpleWebPresenter

annotate CacheTimeCheck.inc @ 68:4dfa3f6a2dc1

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Modify CacheTimeCheck to have a common parent, and two different implementations for script caches and file caches. Support for linkedcaches.
author Tom Fredrik "BFG" Klaussen <bfg@blenning.no>
date Thu, 11 Oct 2012 23:16:53 +0200
parents 7b87ec8b0842
children dd4ddedca4c5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 <?php
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2 $baseDir = dirname(__FILE__);
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3
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4 include_once 'Logger.inc';
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5 include_once 'common-functions.inc';
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6 $cache = ScriptIncludeCache::instance(__FILE__);
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7 $cache->cache_time("${baseDir}/Logger.inc");
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8 $cache->cache_time("${baseDir}/common-functions.inc");
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9
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10 class FileCacheSet {
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11 private $newest = 0;
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12 private $files = array();
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13 private $parentCaches = array();
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14
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15 protected function __construct($parent = null) {
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16 if ($parent) {
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17 $this->addParent($parent);
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18 }
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19 }
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20
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21 protected function addParent($parent)
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22 {
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23 array_push($this->parentCaches, $parent);
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24 }
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25
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26 /**
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27 * List a set of files which contributes to this pages cacheset.
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28 *
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29 * @param $humanReadable If the timestamp should be humand readable.
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30 *
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31 * @return an associative array of file, and timestamp
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32 */
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33 function cacheSet($humanReadable = False)
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34 {
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35 $retVal = array();
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36 foreach ($this->parentCaches as $parent) {
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37 $retVal = array_merge($retVal, $parent->cacheSet($humanReadable));
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38 }
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39 foreach($this->files as $file) {
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40 $mtime = filemtime($file);
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41 if ($humanReadable)
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42 $mtime = gmdate('D, d M Y H:i:s', $mtime) . ' GMT';
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43
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44 $retVal[$file] = $mtime;
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45 }
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46 return $retVal;
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47 }
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48
48
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49 /**
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50 * Include a file in the cacheset
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51 *
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52 * @param $path the path of the file
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53 */
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54 function cache_time($path)
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55 {
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56 if (!file_exists($path)) {
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57 Logger::warn("${path} does not exist");
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58 errorPage("Resource is not available");
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59 }
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60
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61 array_push($this->files, $path);
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62 $mtime = filemtime($path);
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63 if ($mtime > $this->newest) {
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64 $this->newest = $mtime;
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65 }
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66 }
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67
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68 function getNewest()
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69 {
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70 $newest = 0;
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71 foreach ($this->parentCaches as $parent) {
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72 $newest = max($newest, $parent->getNewest());
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73 }
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74 $newest = max($newest, $this->newest);
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75 return $newest;
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76 }
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77 }
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78
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79 class ScriptIncludeCache extends FileCacheSet
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80 {
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81 private static $myInstance = 0;
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82
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83 protected function __construct($filename = False)
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84 {
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85 parent::__construct();
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86 if ($filename)
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87 $this->cache_time($filename);
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88 $this->cache_time(__FILE__);
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89 }
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90
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91 /**
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92 * Generates a singleton instance of this CacheTimeCheck
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93 *
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94 * @param $filename an optional file to include in the cacheset
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95 *
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96 * @return a CacheTimeCheck object
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97 */
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98 function instance($filename = False)
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99 {
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100 if (! self::$myInstance)
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101 self::$myInstance = new self($filename);
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102 elseif ($filename)
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103 self::$myInstance->cache_time($filename);
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104 return self::$myInstance;
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105 }
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106
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107 /**
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108 * Convenience function to include a file, and add it to the cacheset.
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109 *
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110 * @param $path path of the file
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111 * @param $basedir a directory to prepend to the path
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112 */
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113 function includeOnce($path, $basedir = false)
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114 {
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115 if ($basedir)
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116 $path = $basedir . "/" . $path;
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117 $this->cache_time($path);
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118 include_once($path);
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119 }
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120 }
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121
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122 /**
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123 * CacheTimeCheck provides a set of functions to enable generating a
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124 * correct time for the latest update for a given file.
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125 *
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126 * @author Tom Fredrik Blenning Klaussen
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127 */
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128 class CacheTimeCheck extends FileCacheSet
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129 {
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130 function __construct($filename = False)
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131 {
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132 parent::__construct();
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133 if ($filename)
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134 $this->cache_time($filename);
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135 $this->cache_time(__FILE__);
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136 }
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137
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138 public function addParent($cache)
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139 {
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140 parent::addParent($cache);
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141 }
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142
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143 /**
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144 * Checks if a HTTP_IF_MODIFIED_SINCE header is set, if this file is
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145 * newer, set a Last-Modified header, otherwise abort with an 304
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146 * status code
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147 */
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148 function CheckHttpModified()
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149 {
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150 if (DEBUG_LEVEL >= VERBOSITY_DEBUG)
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151 var_dump($_SERVER);
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152
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153 $gmdate_mod = gmdate('D, d M Y H:i:s', $this->getNewest()) . ' GMT';
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154
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155 if(array_key_exists('HTTP_IF_MODIFIED_SINCE', $_SERVER)) {
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156 $HTTP_IF_MODIFIED_SINCE = $_SERVER['HTTP_IF_MODIFIED_SINCE'];
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157 $if_modified_since = preg_replace('/;.*$/', '', $HTTP_IF_MODIFIED_SINCE);
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158
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159 if (strtotime($if_modified_since) >= $this->getNewest()) {
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160 header("HTTP/1.0 304 Not Modified");
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161 exit;
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162 }
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163 }
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164
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165 header("Last-Modified: $gmdate_mod");
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166 }
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167
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168 /**
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169 * Convenience function to load a file, and add it to the cacheset
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170 *
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171 * @param $path path of the file
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172 * @return the contents of the file
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173 */
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174 function loadFile($path)
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175 {
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176 $this->cache_time($path);
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177 return loadFile($path);
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178 }
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179 }
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180 ?>