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wp-content/plugins/jetpack-boost/app/modules/optimizations/page-cache/class-garbage-collection.php

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+<?php
+
+namespace Automattic\Jetpack_Boost\Modules\Optimizations\Page_Cache;
+
+use Automattic\Jetpack_Boost\Modules\Optimizations\Page_Cache\Pre_WordPress\Boost_Cache;
+use Automattic\Jetpack_Boost\Modules\Optimizations\Page_Cache\Pre_WordPress\Logger;
+
+class Garbage_Collection {
+	const ACTION = 'jetpack_boost_cache_garbage_collection';
+
+	/**
+	 * Register hooks.
+	 */
+	public static function setup() {
+		add_action( self::ACTION, array( self::class, 'garbage_collect' ) );
+
+		// Clear old log files when garbage collection is run. Do not pass the $older_than parameter to the method as it's not supported.
+		add_action( self::ACTION, array( Logger::class, 'delete_old_logs' ), 10, 0 );
+	}
+
+	public static function schedule_single_garbage_collection() {
+		$older_than = time();
+		wp_schedule_single_event( $older_than, self::ACTION, array( 'older_than' => $older_than ) );
+	}
+
+	/**
+	 * Garbage collect expired files.
+	 *
+	 * @param int|null $older_than The timestamp before which files should be deleted. If not provided, the files older than default cache duration will be deleted.
+	 */
+	public static function garbage_collect( $older_than = null ) {
+		$cache_ttl = JETPACK_BOOST_CACHE_DURATION;
+
+		/*
+		 * If an $older_than value is specified, use it to calculate the cache TTL.
+		 * By specifying $older_than, you can instruct garbage collection to apply on files created before a certain point in time.
+		 * This ensures garbage collection is not clearing files that were created after the request was made. Useful to avoid race conditions.
+		 */
+		if ( $older_than !== null ) {
+			$cache_ttl = time() - $older_than;
+		}
+
+		$cache = new Boost_Cache();
+		$cache->get_storage()->garbage_collect( $cache_ttl );
+	}
+
+	/**
+	 * Setup the garbage collection cron job.
+	 */
+	public static function activate() {
+		self::setup();
+
+		if ( ! wp_next_scheduled( self::ACTION ) ) {
+			wp_schedule_event( time(), 'hourly', self::ACTION );
+		}
+	}
+
+	/**
+	 * Remove the garbage collection cron job.
+	 */
+	public static function deactivate() {
+		wp_clear_scheduled_hook( self::ACTION );
+	}
+}