Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like Nexcessnet_Turpentine_Model_Observer_Ban often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Nexcessnet_Turpentine_Model_Observer_Ban, and based on these observations, apply Extract Interface, too.
1 | <?php |
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26 | class Nexcessnet_Turpentine_Model_Observer_Ban extends Varien_Event_Observer { |
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27 | |||
28 | /** |
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29 | * Cache the varnish admin object |
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30 | * @var Nexcessnet_Turpentine_Model_Varnish_Admin |
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31 | */ |
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32 | protected $_varnishAdmin = null; |
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33 | /** |
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34 | * Flag to prevent doing the ESI cache clear more than once per request |
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35 | * @var boolean |
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36 | */ |
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37 | protected $_esiClearFlag = array(); |
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38 | |||
39 | /** |
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40 | * Clear the ESI block cache for a specific client |
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41 | * |
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42 | * Events: |
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43 | * the events are applied dynamically according to what events are set |
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44 | * for the various blocks' esi policies |
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45 | * |
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46 | * @param Varien_Object $eventObject |
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47 | * @return null |
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48 | */ |
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49 | public function banClientEsiCache($eventObject) { |
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74 | |||
75 | /** |
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76 | * Ban a specific product page from the cache |
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77 | * |
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78 | * Events: |
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79 | * catalog_product_save_commit_after |
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80 | * |
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81 | * @param Varien_Object $eventObject |
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82 | * @return null |
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83 | */ |
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84 | public function banProductPageCache($eventObject) { |
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102 | |||
103 | /** |
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104 | * Ban a product page from the cache if it's stock status changed |
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105 | * |
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106 | * Events: |
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107 | * cataloginventory_stock_item_save_after |
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108 | * |
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109 | * @param Varien_Object $eventObject |
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110 | * @return null |
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111 | */ |
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112 | public function banProductPageCacheCheckStock($eventObject) { |
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138 | |||
139 | /** |
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140 | * Ban a category page, and any subpages on save |
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141 | * |
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142 | * Events: |
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143 | * catalog_category_save_commit_after |
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144 | * |
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145 | * @param Varien_Object $eventObject |
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146 | * @return null |
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147 | */ |
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148 | View Code Duplication | public function banCategoryCache($eventObject) { |
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160 | |||
161 | /** |
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162 | * Clear the media (CSS/JS) cache, corresponds to the buttons on the cache |
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163 | * page in admin |
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164 | * |
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165 | * Events: |
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166 | * clean_media_cache_after |
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167 | * |
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168 | * @param Varien_Object $eventObject |
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169 | * @return null |
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170 | */ |
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171 | View Code Duplication | public function banMediaCache($eventObject) { |
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178 | |||
179 | /** |
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180 | * Flush catalog images cache, corresponds to same button in admin cache |
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181 | * management page |
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182 | * |
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183 | * Events: |
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184 | * clean_catalog_images_cache_after |
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185 | * |
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186 | * @param Varien_Object $eventObject |
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187 | * @return null |
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188 | */ |
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189 | View Code Duplication | public function banCatalogImagesCache($eventObject) { |
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197 | |||
198 | /** |
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199 | * Ban a specific CMS page from cache after edit |
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200 | * |
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201 | * Events: |
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202 | * cms_page_save_commit_after |
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203 | * |
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204 | * @param Varien_Object $eventObject |
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205 | * @return null |
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206 | */ |
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207 | View Code Duplication | public function banCmsPageCache($eventObject) { |
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219 | |||
220 | /** |
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221 | * Ban a specific CMS page revision from cache after edit (enterprise edition only) |
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222 | * Events: |
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223 | * enterprise_cms_revision_save_commit_after |
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224 | * |
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225 | * @param Varien_Object $eventObject |
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226 | * @return null |
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227 | */ |
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228 | public function banCmsPageRevisionCache($eventObject) { |
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247 | |||
248 | /** |
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249 | * Do a full cache flush, corresponds to "Flush Magento Cache" and |
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250 | * "Flush Cache Storage" buttons in admin > cache management |
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251 | * |
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252 | * Events: |
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253 | * adminhtml_cache_flush_system |
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254 | * adminhtml_cache_flush_all |
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255 | * |
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256 | * @param Varien_Object $eventObject |
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257 | * @return null |
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258 | */ |
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259 | View Code Duplication | public function banAllCache($eventObject) { |
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266 | |||
267 | /** |
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268 | * Do a flush on the ESI blocks |
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269 | * |
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270 | * Events: |
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271 | * adminhtml_cache_refresh_type |
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272 | * |
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273 | * @param Varien_Object $eventObject |
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274 | * @return null |
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275 | */ |
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276 | public function banCacheType($eventObject) { |
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293 | |||
294 | /** |
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295 | * Ban a product's reviews page |
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296 | * |
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297 | * @param Varien_Object $eventObject |
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298 | * @return bool |
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299 | */ |
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300 | public function banProductReview($eventObject) { |
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335 | |||
336 | /** |
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337 | * Check a result from varnish admin action, log if result has errors |
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338 | * |
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339 | * @param array $result stored as $socketName => $result |
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340 | * @return bool |
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341 | */ |
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342 | protected function _checkResult($result) { |
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354 | |||
355 | /** |
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356 | * Get the varnish admin socket |
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357 | * |
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358 | * @return Nexcessnet_Turpentine_Model_Varnish_Admin |
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359 | */ |
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360 | protected function _getVarnishAdmin() { |
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366 | } |
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367 |
You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.