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<?php |
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/** |
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* Class StatisticsCache |
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* |
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* @package LearnPress/Classes/Statistics |
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* @since 4.4.2 |
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*/ |
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|
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namespace LearnPress\Statistics; |
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|
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use LP_Cache; |
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|
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defined( 'ABSPATH' ) || exit(); |
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|
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/** |
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* Short-lived cache for the heavy dashboard aggregates |
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* (funnel, health checks, instructor performance, watchlist). |
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* |
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* Backed by LP_Cache (WP object cache + optional Thim persistent cache, the |
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* same store LearnPress uses for its expensive course queries) under the |
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* 'learn_press/statistics' group. Keyed by md5 of the bucket + its params; |
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* TTL only, no explicit busting — data self-refreshes after the window. |
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* |
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* Set the TTL filter to 0 to bypass caching entirely (useful while profiling |
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* or debugging queries). |
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* |
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* @since 4.4.2 |
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*/ |
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class StatisticsCache extends LP_Cache { |
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/** |
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* @var string Cache group child → group 'learn_press/statistics'. |
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*/ |
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protected $key_group_child = 'statistics'; |
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|
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/** |
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* Persist through the Thim cache layer too, matching LearnPress' own |
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* heavy-query caching, so entries survive across requests where available. |
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*/ |
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public function __construct( $has_thim_cache = true ) { |
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parent::__construct( $has_thim_cache ); |
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} |
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|
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/** |
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* Cache lifetime in seconds. 0 (or negative) disables caching. |
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* |
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* @return int |
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*/ |
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public static function ttl(): int { |
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return (int) apply_filters( 'learn-press/statistics/cache-ttl', 300 ); |
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} |
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|
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/** |
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* Return the cached array for ( bucket, params ) or compute + store it. |
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* |
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* Only array payloads are trusted on read — a corrupt/false/scalar hit is |
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* treated as a miss and recomputed. All dashboard datasets are arrays. |
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* |
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* @param string $bucket Short logical name of the dataset, e.g. 'funnel'. |
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* @param array $key_params Everything the result depends on (type, value, scope signature, flags). |
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* @param callable $callback Produces the value on a cache miss. |
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* @return array |
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*/ |
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public static function remember( string $bucket, array $key_params, callable $callback ): array { |
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$ttl = self::ttl(); |
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if ( $ttl <= 0 ) { |
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return (array) call_user_func( $callback ); |
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} |
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|
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$key = $bucket . '_' . md5( (string) wp_json_encode( $key_params ) ); |
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$cache = new self(); |
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|
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$cached = $cache->get_cache( $key ); |
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if ( is_array( $cached ) ) { |
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return $cached; |
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} |
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|
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$value = (array) call_user_func( $callback ); |
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$cache->set_cache( $key, $value, $ttl ); |
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|
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return $value; |
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} |
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} |
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