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 | * |
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26 | * @since 2.2.2 |
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27 | * @var object |
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28 | */ |
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29 | protected static $instance; |
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30 | |||
31 | /** |
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32 | * Get the singleton instance of this class |
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33 | * |
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34 | * @since 2.2.2 |
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35 | * @return CMB2_Ajax |
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36 | */ |
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37 | 5 | public static function get_instance() { |
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44 | |||
45 | /** |
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46 | * Constructor |
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47 | * |
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48 | * @since 2.2.0 |
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49 | */ |
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50 | 1 | protected function __construct() { |
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56 | |||
57 | /** |
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58 | * Handles our oEmbed ajax request |
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59 | * |
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60 | * @since 0.9.5 |
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61 | * @return object oEmbed embed code | fallback | error message |
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62 | */ |
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63 | 1 | public function oembed_handler() { |
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102 | |||
103 | /** |
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104 | * Retrieves oEmbed from url/object ID |
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105 | * |
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106 | * @since 0.9.5 |
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107 | * @param array $args Arguments for method |
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108 | * @return string html markup with embed or fallback |
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109 | */ |
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110 | 3 | public function get_oembed_no_edit( $args ) { |
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168 | |||
169 | /** |
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170 | * Retrieves oEmbed from url/object ID |
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171 | * |
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172 | * @since 0.9.5 |
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173 | * @param array $args Arguments for method |
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174 | * @return string html markup with embed or fallback |
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175 | */ |
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176 | 2 | public function get_oembed( $args ) { |
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195 | |||
196 | /** |
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197 | * Hijacks retrieving of cached oEmbed. |
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198 | * Returns cached data from relevant object metadata (vs postmeta) |
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199 | * |
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200 | * @since 0.9.5 |
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201 | * @param boolean $check Whether to retrieve postmeta or override |
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202 | * @param int $object_id Object ID |
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203 | * @param string $meta_key Object metakey |
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204 | * @return mixed Object's oEmbed cached data |
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205 | */ |
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206 | 111 | public function hijack_oembed_cache_get( $check, $object_id, $meta_key ) { |
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217 | |||
218 | /** |
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219 | * Hijacks saving of cached oEmbed. |
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220 | * Saves cached data to relevant object metadata (vs postmeta) |
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221 | * |
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222 | * @since 0.9.5 |
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223 | * @param boolean $check Whether to continue setting postmeta |
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224 | * @param int $object_id Object ID to get postmeta from |
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225 | * @param string $meta_key Postmeta's key |
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226 | * @param mixed $meta_value Value of the postmeta to be saved |
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227 | * @return boolean Whether to continue setting |
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228 | */ |
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229 | 93 | public function hijack_oembed_cache_set( $check, $object_id, $meta_key, $meta_value ) { |
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245 | |||
246 | /** |
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247 | * Gets/updates the cached oEmbed value from/to relevant object metadata (vs postmeta) |
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248 | * |
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249 | * @since 1.3.0 |
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250 | * @param string $meta_key Postmeta's key |
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251 | */ |
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252 | 3 | protected function cache_action( $meta_key ) { |
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278 | |||
279 | /** |
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280 | * Hooks in when options-page data is saved to clean stale |
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281 | * oembed cache data from the option value. |
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282 | * |
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283 | * @since 2.2.0 |
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284 | * @param string $option_key The options-page option key |
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285 | * @return void |
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286 | */ |
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287 | 1 | public static function clean_stale_options_page_oembeds( $option_key ) { |
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320 | |||
321 | } |
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322 |
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.