Complex classes like CMB2_Ajax 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 CMB2_Ajax, and based on these observations, apply Extract Interface, too.
1 | <?php |
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14 | class CMB2_Ajax { |
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15 | |||
16 | // Whether to hijack the oembed cache system |
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17 | protected $hijack = false; |
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18 | protected $object_id = 0; |
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19 | protected $embed_args = array(); |
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20 | protected $object_type = 'post'; |
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21 | protected $ajax_update = false; |
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22 | |||
23 | /** |
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24 | * Instance of this class |
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25 | * @since 2.2.2 |
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26 | * @var object |
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27 | 1 | */ |
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28 | 1 | protected static $instance; |
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29 | 1 | ||
30 | /** |
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31 | * Get the singleton instance of this class |
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32 | * @since 2.2.2 |
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33 | * @return object |
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34 | */ |
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35 | public static function get_instance() { |
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42 | |||
43 | 1 | /** |
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44 | 1 | * Constructor |
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45 | 1 | * @since 2.2.0 |
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46 | 1 | */ |
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47 | protected function __construct() { |
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53 | |||
54 | /** |
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55 | * Handles our oEmbed ajax request |
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56 | * @since 0.9.5 |
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57 | * @return object oEmbed embed code | fallback | error message |
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58 | */ |
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59 | public function oembed_handler() { |
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96 | |||
97 | 2 | /** |
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98 | * Retrieves oEmbed from url/object ID |
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99 | 2 | * @since 0.9.5 |
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100 | * @param array $args Arguments for method |
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101 | 2 | * @return string html markup with embed or fallback |
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102 | */ |
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103 | public function get_oembed( $args ) { |
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168 | |||
169 | /** |
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170 | * Hijacks retrieving of cached oEmbed. |
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171 | * Returns cached data from relevant object metadata (vs postmeta) |
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172 | * |
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173 | 68 | * @since 0.9.5 |
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174 | 68 | * @param boolean $check Whether to retrieve postmeta or override |
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175 | 67 | * @param int $object_id Object ID |
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176 | * @param string $meta_key Object metakey |
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177 | * @return mixed Object's oEmbed cached data |
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178 | 2 | */ |
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179 | public function hijack_oembed_cache_get( $check, $object_id, $meta_key ) { |
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190 | |||
191 | /** |
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192 | * Hijacks saving of cached oEmbed. |
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193 | * Saves cached data to relevant object metadata (vs postmeta) |
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194 | * |
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195 | * @since 0.9.5 |
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196 | 52 | * @param boolean $check Whether to continue setting postmeta |
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197 | * @param int $object_id Object ID to get postmeta from |
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198 | * @param string $meta_key Postmeta's key |
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199 | 52 | * @param mixed $meta_value Value of the postmeta to be saved |
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200 | 52 | * @return boolean Whether to continue setting |
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201 | */ |
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202 | 52 | public function hijack_oembed_cache_set( $check, $object_id, $meta_key, $meta_value ) { |
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218 | |||
219 | /** |
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220 | 2 | * Gets/updates the cached oEmbed value from/to relevant object metadata (vs postmeta) |
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221 | 2 | * |
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222 | 2 | * @since 1.3.0 |
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223 | * @param string $meta_key Postmeta's key |
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224 | 2 | * @param mixed $meta_value (Optional) value of the postmeta to be saved |
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225 | */ |
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226 | 2 | protected function cache_action( $meta_key ) { |
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252 | |||
253 | /** |
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254 | 1 | * Hooks in when options-page data is saved to clean stale |
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255 | 1 | * oembed cache data from the option value. |
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256 | 1 | * @since 2.2.0 |
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257 | * @param string $option_key The options-page option key |
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258 | 1 | * @return void |
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259 | 1 | */ |
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260 | 1 | public static function clean_stale_options_page_oembeds( $option_key ) { |
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292 | |||
293 | } |
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294 |
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.