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.