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*/ private $post_id_to_email_type_cache = array(); /** * In-memory cache for email class name (e.g. 'WC_Email_Customer_New_Account') lookups within the same request. * * @var array */ private $email_class_name_cache = array(); /** * Gets the singleton instance of the class. * * @return WCTransactionalEmailPostsManager Instance of the class. */ public static function get_instance() { if ( null === self::$instance ) { self::$instance = new self(); } return self::$instance; } /** * Build an `email_id => WC_Email` lookup from the list returned by * `WC_Emails::get_emails()`, which keys entries by class name rather than * by email ID. * * @return array Registered emails keyed by their `id` property. * * @since 10.8.0 */ public function get_emails_by_id(): array { /** * Registered emails keyed by class name. * * @var array */ $all_emails = \WC_Emails::instance()->get_emails(); $indexed = array(); foreach ( $all_emails as $email ) { if ( $email instanceof \WC_Email && ! empty( $email->id ) ) { $indexed[ $email->id ] = $email; } } return $indexed; } /** * Look up a single registered `WC_Email` instance by its ID. * * @param string $email_id The email ID to look up (`WC_Email->id`). * @return \WC_Email|null The matching instance, or null if no email with * that ID is registered. * * @since 10.8.0 */ public function get_email_by_id( string $email_id ): ?\WC_Email { if ( '' === $email_id ) { return null; } return $this->get_emails_by_id()[ $email_id ] ?? null; } /** * Retrieves the email post by its type. * * Type here refers to the email type, e.g. 'customer_new_account' from the WC_Email->id property. * * @param string $email_type The type of email to retrieve. * @return \WP_Post|null The email post if found, null otherwise. */ public function get_email_post( $email_type ) { $post_id = $this->get_email_template_post_id( $email_type ); if ( ! $post_id ) { return null; } $post = get_post( $post_id ); if ( ! $post instanceof \WP_Post ) { return null; } return $post; } /** * Retrieves the WooCommerce email type from the options table when post ID is provided. * * Uses multi-level caching: * 1. In-memory cache for the same request * 2. WordPress object cache for cross-request caching * 3. Database query if cache is not available. * * @param int|string $post_id The post ID. * @param bool $skip_cache Whether to skip the cache. Defaults to false. * @return string|null The WooCommerce email type if found, null otherwise. */ public function get_email_type_from_post_id( $post_id, $skip_cache = false ) { // Early return if post_id is invalid. if ( empty( $post_id ) ) { return null; } $post_id = (int) $post_id; $cache_key = $this->get_cache_key_for_post_id( $post_id ); if ( ! $skip_cache ) { // Check in-memory cache first (fastest). if ( array_key_exists( $post_id, $this->post_id_to_email_type_cache ) ) { return $this->post_id_to_email_type_cache[ $post_id ]; } // Check WordPress object cache. $email_type = wp_cache_get( $cache_key, self::CACHE_GROUP ); if ( ! empty( $email_type ) ) { $this->post_id_to_email_type_cache[ $post_id ] = $email_type; return $email_type; } } // Cache miss - perform database query. global $wpdb; $option_name = $wpdb->get_var( $wpdb->prepare( "SELECT option_name FROM {$wpdb->options} WHERE option_name LIKE %s AND option_value = %s LIMIT 1", self::WC_OPTION_NAME, $post_id ) ); if ( empty( $option_name ) ) { return null; } $email_type = $this->get_email_type_from_option_name( $option_name ); // Store in both caches. $this->post_id_to_email_type_cache[ $post_id ] = $email_type; wp_cache_set( $cache_key, $email_type, self::CACHE_GROUP, self::CACHE_EXPIRATION ); return $email_type; } /** * Checks if an email template exists for the given type. * * Type here refers to the email type, e.g. 'customer_new_account' from the WC_Email->id property. * * @param string $email_type The type of email to check. * @return bool True if the template exists, false otherwise. */ public function template_exists( $email_type ) { return null !== $this->get_email_post( $email_type ); } /** * Saves the post ID for a specific email template type. * * @param string $email_type The type of email template e.g. 'customer_new_account' from the WC_Email->id property. * @param int $post_id The post ID to save. */ public function save_email_template_post_id( $email_type, $post_id ) { $option_name = $this->get_option_name( $email_type ); $previous_id = get_option( $option_name ); update_option( $option_name, $post_id ); // Invalidate caches for the previous mapping (if any). if ( ! empty( $previous_id ) ) { $this->invalidate_cache_for_template( (int) $previous_id, 'post_id' ); } // Invalidate cache for the new post_id. $this->invalidate_cache_for_template( $email_type, 'email_type' ); // Update in-memory caches with the new values. $this->post_id_to_email_type_cache[ $post_id ] = $email_type; wp_cache_set( $this->get_cache_key_for_post_id( $post_id ), $email_type, self::CACHE_GROUP, self::CACHE_EXPIRATION ); } /** * Gets the post ID for a specific email template type. * * Uses multi-level caching for improved performance. * * @param string $email_type The type of email template e.g. 'customer_new_account' from the WC_Email->id property. * @return int|false The post ID if found, false otherwise. */ public function get_email_template_post_id( $email_type ) { // Check in-memory cache first. $post_id_from_cache = array_search( $email_type, $this->post_id_to_email_type_cache, true ); if ( false !== $post_id_from_cache ) { return $post_id_from_cache; } $option_name = $this->get_option_name( $email_type ); $post_id = get_option( $option_name ); if ( ! empty( $post_id ) ) { $post_id = (int) $post_id; // Store in in-memory cache. $this->post_id_to_email_type_cache[ $post_id ] = $email_type; } return $post_id; } /** * Deletes the post ID for a specific email template type. * * @param string $email_type The type of email template e.g. 'customer_new_account' from the WC_Email->id property. */ public function delete_email_template( $email_type ) { $option_name = $this->get_option_name( $email_type ); $post_id = get_option( $option_name ); if ( ! $post_id ) { return; } delete_option( $option_name ); // Invalidate cache. $this->invalidate_cache_for_template( $post_id, 'post_id' ); } /** * Invalidates cache entries for a specific post ID or email type. * * @param int|string $value The value to invalidate cache for. * @param string $type The type of value to invalidate cache for. Can be 'post_id' or 'email_type'. * @return void */ private function invalidate_cache_for_template( $value, $type = 'post_id' ) { $post_id_array = array(); if ( 'post_id' === $type ) { $post_id_array[] = (int) $value; } elseif ( 'email_type' === $type ) { // Get all the post IDs that map to the email type. $post_id_array = array_merge( $post_id_array, array_unique( array_keys( $this->post_id_to_email_type_cache, $value, true ) ) ); } foreach ( $post_id_array as $post_id ) { unset( $this->post_id_to_email_type_cache[ $post_id ] ); // Delete from WordPress object cache. $cache_key = $this->get_cache_key_for_post_id( $post_id ); wp_cache_delete( $cache_key, self::CACHE_GROUP ); } } /** * Clears all in-memory caches. * * Useful for testing and debugging. Note that this only clears in-memory caches, * not the WordPress object cache entries (which will expire naturally). */ public function clear_caches() { $this->post_id_to_email_type_cache = array(); $this->email_class_name_cache = array(); } /** * Gets the cache key for a specific post ID. * * @param int $post_id The post ID. * @return string The cache key e.g. 'post_id_to_email_type_123'. */ public function get_cache_key_for_post_id( $post_id ) { return 'post_id_to_email_type_' . $post_id; } /** * Gets the option name for a specific email type. * * @param string $email_type The type of email template e.g. 'customer_new_account' from the WC_Email->id property. * @return string The option name e.g. 'woocommerce_email_templates_customer_new_account_post_id' */ private function get_option_name( $email_type ) { return str_replace( '%', $email_type, self::WC_OPTION_NAME ); } /** * Gets the email type from the option name. * * @param string $option_name The option name e.g. 'woocommerce_email_templates_customer_new_account_post_id'. * @return string The email type e.g. 'customer_new_account' */ private function get_email_type_from_option_name( $option_name ) { return str_replace( array( 'woocommerce_email_templates_', '_post_id', ), '', $option_name ); } /** * Gets the email type class name, e.g. 'WC_Email_Customer_New_Account' from the email ID (e.g. 'customer_new_account' from the WC_Email->id property). * * Uses in-memory caching to avoid repeated iterations through all registered emails. * * @param string $email_id The email ID. * @return string|null The email type class name. */ public function get_email_type_class_name_from_email_id( $email_id ) { // Early return if email_id is invalid. if ( empty( $email_id ) ) { return null; } // Check in-memory cache first. if ( isset( $this->email_class_name_cache[ $email_id ] ) ) { return $this->email_class_name_cache[ $email_id ]; } /** * Get all the emails registered in WooCommerce. * * @var \WC_Email[] */ $emails = WC()->mailer()->get_emails(); // Build the cache for all emails at once to avoid repeated iterations. foreach ( $emails as $email ) { $this->email_class_name_cache[ $email->id ] = get_class( $email ); } // Return the requested email class name if it exists. return $this->email_class_name_cache[ $email_id ] ?? null; } /** * Gets the email type class name, e.g. 'WC_Email_Customer_New_Account' from the post ID. * * @param int $post_id The post ID. * @return string|null The email type class name. */ public function get_email_type_class_name_from_post_id( $post_id ) { // Early return if post_id is invalid. if ( empty( $post_id ) ) { return null; } return $this->get_email_type_class_name_from_email_id( $this->get_email_type_from_post_id( $post_id ) ); } }