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Filename : DbCache_Plugin.php
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<?php
namespace W3TC;

/**
 * W3 DbCache plugin
 */
class DbCache_Plugin {
	/**
	 * Config
	 */
	private $_config = null;

	function __construct() {
		$this->_config = Dispatcher::config();
	}

	/**
	 * Runs plugin
	 */
	function run() {
		add_filter( 'cron_schedules', array(
				$this,
				'cron_schedules'
			) );

		if ( $this->_config->get_string( 'dbcache.engine' ) == 'file' ) {
			add_action( 'w3_dbcache_cleanup', array(
					$this,
					'cleanup'
				) );
		}

		add_action( 'publish_phone', array(
				$this,
				'on_change'
			), 0 );

		add_action( 'wp_trash_post', array(
				$this,
				'on_post_change'
			), 0 );

		add_action( 'save_post', array(
				$this,
				'on_post_change'
			), 0 );

		add_action( 'clean_post_cache', array(
				$this,
				'on_post_change'
			), 0, 2 );

		add_action( 'comment_post', array(
				$this,
				'on_comment_change'
			), 0 );

		add_action( 'edit_comment', array(
				$this,
				'on_comment_change'
			), 0 );

		add_action( 'delete_comment', array(
				$this,
				'on_comment_change'
			), 0 );

		add_action( 'wp_set_comment_status', array(
				$this,
				'on_comment_status'
			), 0, 2 );

		add_action( 'trackback_post', array(
				$this,
				'on_comment_change'
			), 0 );

		add_action( 'pingback_post', array(
				$this,
				'on_comment_change'
			), 0 );

		add_action( 'switch_theme', array(
				$this,
				'on_change'
			), 0 );

		add_action( 'edit_user_profile_update', array(
				$this,
				'on_change'
			), 0 );

		if ( Util_Environment::is_wpmu() ) {
			add_action( 'delete_blog', array(
					$this,
					'on_change'
				), 0 );
		}

		add_action( 'delete_post', array(
				$this,
				'on_post_change'
			), 0 );

		add_filter( 'w3tc_admin_bar_menu',
			array( $this, 'w3tc_admin_bar_menu' ) );

		// usage statistics handling
		add_filter( 'w3tc_usage_statistics_metrics', array(
				$this, 'w3tc_usage_statistics_metrics' ) );
		add_filter( 'w3tc_usage_statistics_sources', array(
				$this, 'w3tc_usage_statistics_sources' ) );
	}

	/**
	 * Does disk cache cleanup
	 *
	 * @return void
	 */
	function cleanup() {
		$w3_cache_file_cleaner = new Cache_File_Cleaner( array(
				'cache_dir' => Util_Environment::cache_blog_dir( 'db' ),
				'clean_timelimit' => $this->_config->get_integer( 'timelimit.cache_gc' )
			) );

		$w3_cache_file_cleaner->clean();
	}

	/**
	 * Cron schedules filter
	 *
	 * @param array   $schedules
	 * @return array
	 */
	function cron_schedules( $schedules ) {
		$gc = $this->_config->get_integer( 'dbcache.file.gc' );

		return array_merge( $schedules, array(
				'w3_dbcache_cleanup' => array(
					'interval' => $gc,
					'display' => sprintf( '[W3TC] Database Cache file GC (every %d seconds)', $gc )
				)
			) );
	}

	/**
	 * Change action
	 */
	function on_change() {
		static $flushed = false;

		if ( !$flushed ) {
			$flusher = Dispatcher::component( 'CacheFlush' );
			$flusher->dbcache_flush();

			$flushed = true;
		}
	}

	/**
	 * Change post action
	 */
	function on_post_change( $post_id = 0, $post = null ) {
		static $flushed = false;

		if ( !$flushed ) {
			if ( is_null( $post ) ) {
				$post = $post_id;
			}

			if ( $post_id > 0 &&
					!Util_Environment::is_flushable_post(
						$post, 'dbcache', $this->_config ) ) {
				return;
			}

			$flusher = Dispatcher::component( 'CacheFlush' );
			$flusher->dbcache_flush();

			$flushed = true;
		}
	}

	/**
	 * Comment change action
	 *
	 * @param integer $comment_id
	 */
	function on_comment_change( $comment_id ) {
		$post_id = 0;

		if ( $comment_id ) {
			$comment = get_comment( $comment_id, ARRAY_A );
			$post_id = !empty( $comment['comment_post_ID'] ) ? (int) $comment['comment_post_ID'] : 0;
		}

		$this->on_post_change( $post_id );
	}

	/**
	 * Comment status action
	 *
	 * @param integer $comment_id
	 * @param string  $status
	 */
	function on_comment_status( $comment_id, $status ) {
		if ( $status === 'approve' || $status === '1' ) {
			$this->on_comment_change( $comment_id );
		}
	}



	public function w3tc_admin_bar_menu( $menu_items ) {
		$menu_items['20310.dbcache'] = array(
			'id' => 'w3tc_flush_dbcache',
			'parent' => 'w3tc_flush',
			'title' => __( 'Database', 'w3-total-cache' ),
			'href' => wp_nonce_url( admin_url(
					'admin.php?page=w3tc_dashboard&amp;w3tc_flush_dbcache' ),
				'w3tc' )
		);

		return $menu_items;
	}



	public function w3tc_usage_statistics_of_request( $storage ) {
		$o = Dispatcher::component( 'ObjectCache_WpObjectCache_Regular' );
		$o->w3tc_usage_statistics_of_request( $storage );
	}



	public function w3tc_usage_statistics_metrics( $metrics ) {
		return array_merge( $metrics, array(
				'dbcache_calls_total',
				'dbcache_calls_hits',
				'dbcache_flushes',
				'dbcache_time_ms'
			) );
	}



	public function w3tc_usage_statistics_sources( $sources ) {
		$c = Dispatcher::config();
		if ( $c->get_string( 'dbcache.engine' ) == 'apc' ) {
			$sources['apc_servers']['dbcache'] = array(
				'name' => __( 'Database Cache', 'w3-total-cache' )
			);
		} elseif ( $c->get_string( 'dbcache.engine' ) == 'memcached' ) {
			$sources['memcached_servers']['dbcache'] = array(
				'servers' => $c->get_array( 'dbcache.memcached.servers' ),
				'username' => $c->get_string( 'dbcache.memcached.username' ),
				'password' => $c->get_string( 'dbcache.memcached.password' ),
				'name' => __( 'Database Cache', 'w3-total-cache' )
			);
		} elseif ( $c->get_string( 'dbcache.engine' ) == 'redis' ) {
			$sources['redis_servers']['dbcache'] = array(
				'servers' => $c->get_array( 'dbcache.redis.servers' ),
				'username' => $c->get_boolean( 'dbcache.redis.username' ),
				'dbid' => $c->get_integer( 'dbcache.redis.dbid' ),
				'password' => $c->get_string( 'dbcache.redis.password' ),
				'name' => __( 'Database Cache', 'w3-total-cache' )
			);
		}

		return $sources;
	}
}