_integer( 'objectcache.redis.retry_interval' ),
						'read_timeout'            => $this->_config->get_integer( 'objectcache.redis.read_timeout' ),
						'dbid'                    => $this->_config->get_integer( 'objectcache.redis.dbid' ),
						'password'                => $this->_config->get_string( 'objectcache.redis.password' ),
					);
					break;

				case 'file':
					$engine_config = array(
						'section'         => 'object',
						'locking'         => $this->_config->get_boolean( 'objectcache.file.locking' ),
						'flush_timelimit' => $this->_config->get_integer( 'timelimit.cache_flush' ),
					);
					break;

				default:
					$engine_config = array();
			}

			$engine_config['blog_id']     = $blog_id;
			$engine_config['module']      = 'object';
			$engine_config['host']        = Util_Environment::host();
			$engine_config['instance_id'] = Util_Environment::instance_id();

			$cache[ $blog_id ] = Cache::instance( $engine, $engine_config );
		}

		return $cache[ $blog_id ];
	}

	/**
	 * Determines whether caching is enabled based on configuration.
	 *
	 * @return bool Returns true if caching is enabled, false otherwise.
	 */
	private function _can_cache() {
		// Skip if disabled.
		if ( ! $this->_config->getf_boolean( 'objectcache.enabled' ) ) {
			$this->cache_reject_reason = 'objectcache.disabled';

			return false;
		}

		// Check for DONOTCACHEOBJECT constant.
		if ( defined( 'DONOTCACHEOBJECT' ) && DONOTCACHEOBJECT ) {
			$this->cache_reject_reason = 'DONOTCACHEOBJECT';

			return false;
		}

		return true;
	}

	/**
	 * Checks if caching is allowed for runtime based on the group.
	 *
	 * @param string $group The cache group to check.
	 *
	 * @return bool Returns true if caching is allowed for the group.
	 */
	private function _check_can_cache_runtime( $group ) {
		// Need to be handled in wp admin as well as frontend.
		if ( $this->_is_transient_group( $group ) ) {
			return true;
		}

		if ( null !== $this->_can_cache_dynamic ) {
			return $this->_can_cache_dynamic;
		}

		if ( $this->_config->get_boolean( 'objectcache.enabled_for_wp_admin' ) ) {
			$this->_can_cache_dynamic = true;
		} elseif (
			$this->_caching
				&& defined( 'WP_ADMIN' )
				&& ( ! defined( 'DOING_AJAX' ) || ! DOING_AJAX )
		) {
			$this->_can_cache_dynamic  = false;
			$this->cache_reject_reason = 'WP_ADMIN defined';

			return $this->_can_cache_dynamic;
		}

		return $this->_caching;
	}

	/**
	 * Determines whether the specified group is a transient group.
	 *
	 * @param string $group The cache group to check.
	 *
	 * @return bool Returns true if the group is transient.
	 */
	private function _is_transient_group( $group ) {
		return in_array( $group, array( 'transient', 'site-transient' ), true );
	}

	/**
	 * Appends information about object cache usage to the footer comment.
	 *
	 * @param array $strings The array of strings to append the data to.
	 *
	 * @return array The modified array of strings.
	 */
	public function w3tc_footer_comment( $strings ) {
		$reason = $this->get_reject_reason();
		$append = empty( $reason ) ? '' : sprintf( ' (%1$s)', $reason );

		$strings[] = sprintf(
			// translators: 1: Cache hits, 2: Cache total cache objects, 3: Engine anme, 4: Reason.
			__( 'Object Caching %1$d/%2$d objects using %3$s%4$s', 'w3-total-cache' ),
			$this->cache_hits,
			$this->cache_total,
			Cache::engine_name( $this->_config->get_string( 'objectcache.engine' ) ),
			$append
		);

		if ( $this->_config->get_boolean( 'objectcache.debug' ) ) {
			$strings[] = '';
			$strings[] = __( 'Object Cache debug info:', 'w3-total-cache' );
			$strings[] = sprintf( '%s%s', str_pad( 'Caching: ', 20 ), ( $this->_caching ? 'enabled' : 'disabled' ) );
			$strings[] = sprintf( '%s%d', str_pad( 'Total calls: ', 20 ), $this->cache_total );
			$strings[] = sprintf( '%s%d', str_pad( 'Cache hits: ', 20 ), $this->cache_hits );
			$strings[] = sprintf( '%s%.4f', str_pad( 'Total time: ', 20 ), $this->time_total );
		}

		return $strings;
	}

	/**
	 * Tracks object cache usage statistics.
	 *
	 * @param Storage $storage The storage instance to track statistics in.
	 *
	 * @return void
	 */
	public function w3tc_usage_statistics_of_request( $storage ) {
		$storage->counter_add( 'objectcache_get_total', $this->cache_total );
		$storage->counter_add( 'objectcache_get_hits', $this->cache_hits );
		$storage->counter_add( 'objectcache_sets', $this->cache_sets );
		$storage->counter_add( 'objectcache_flushes', $this->cache_flushes );
		$storage->counter_add( 'objectcache_time_ms', (int) ( $this->time_total * 1000 ) );
	}


	/**
	 * Retrieves the reason why the cache is being rejected.
	 *
	 * @return string The rejection reason.
	 */
	public function get_reject_reason() {
		if ( is_null( $this->cache_reject_reason ) ) {
			return '';
		}

		return $this->_get_reject_reason_message( $this->cache_reject_reason );
	}

	/**
	 * Retrieves a rejection message based on a given key.
	 *
	 * @param string $key The rejection key.
	 *
	 * @return string The rejection message.
	 */
	private function _get_reject_reason_message( $key ) {
		if ( ! function_exists( '__' ) ) {
			return $key;
		}

		switch ( $key ) {
			case 'objectcache.disabled':
				return __( 'Object caching is disabled', 'w3-total-cache' );
			case 'DONOTCACHEOBJECT':
				return __( 'DONOTCACHEOBJECT constant is defined', 'w3-total-cache' );
			default:
				return '';
		}
	}


	/**
	 * Logs cache-related calls for debugging purposes.
	 *
	 * @param array $data The data to log.
	 *
	 * @return void
	 */
	private function log_call( array $data ): void {
		$filepath = Util_Debug::log_filename( 'objectcache-calls' );
		$content  = implode( "\t", $data ) . PHP_EOL;

		file_put_contents( $filepath, $content, FILE_APPEND );
	}

	/**
	 * Check if this is a WP-CLI call and objectcache.engine is using Disk and disabled for WP-CLI.
	 *
	 * @since  2.8.1
	 *
	 * @return bool True if running WP-CLI with a file-based object cache, false otherwise.
	 */
	private function is_wpcli_disk(): bool {
		$is_engine_disk = 'file' === $this->_config->get_string( 'objectcache.engine' );
		$is_wpcli_disk  = $this->_config->get_boolean( 'objectcache.wpcli_disk' );
		return defined( 'WP_CLI' ) && \WP_CLI && $is_engine_disk && ! $is_wpcli_disk;
	}
}