ted filter from deprecated get_maximum_execution_time() method
		if ( has_filter( 'action_scheduler_maximum_execution_time' ) ) {
			_deprecated_function( 'action_scheduler_maximum_execution_time', '2.1.1', 'action_scheduler_queue_runner_time_limit' );
			$time_limit = apply_filters( 'action_scheduler_maximum_execution_time', $time_limit );
		}

		return absint( apply_filters( 'action_scheduler_queue_runner_time_limit', $time_limit ) );
	}

	/**
	 * Get the number of seconds the process has been running.
	 *
	 * @return int The number of seconds.
	 */
	protected function get_execution_time() {
		$execution_time = microtime( true ) - $this->created_time;

		// Get the CPU time if the hosting environment uses it rather than wall-clock time to calculate a process's execution time.
		if ( function_exists( 'getrusage' ) && apply_filters( 'action_scheduler_use_cpu_execution_time', defined( 'PANTHEON_ENVIRONMENT' ) ) ) {
			$resource_usages = getrusage();

			if ( isset( $resource_usages['ru_stime.tv_usec'], $resource_usages['ru_stime.tv_usec'] ) ) {
				$execution_time = $resource_usages['ru_stime.tv_sec'] + ( $resource_usages['ru_stime.tv_usec'] / 1000000 );
			}
		}

		return $execution_time;
	}

	/**
	 * Check if the host's max execution time is (likely) to be exceeded if processing more actions.
	 *
	 * @param int $processed_actions The number of actions processed so far - used to determine the likelihood of exceeding the time limit if processing another action
	 * @return bool
	 */
	protected function time_likely_to_be_exceeded( $processed_actions ) {

		$execution_time        = $this->get_execution_time();
		$max_execution_time    = $this->get_time_limit();
		$time_per_action       = $execution_time / $processed_actions;
		$estimated_time        = $execution_time + ( $time_per_action * 3 );
		$likely_to_be_exceeded = $estimated_time > $max_execution_time;

		return apply_filters( 'action_scheduler_maximum_execution_time_likely_to_be_exceeded', $likely_to_be_exceeded, $this, $processed_actions, $execution_time, $max_execution_time );
	}

	/**
	 * Get memory limit
	 *
	 * Based on WP_Background_Process::get_memory_limit()
	 *
	 * @return int
	 */
	protected function get_memory_limit() {
		if ( function_exists( 'ini_get' ) ) {
			$memory_limit = ini_get( 'memory_limit' );
		} else {
			$memory_limit = '128M'; // Sensible default, and minimum required by WooCommerce
		}

		if ( ! $memory_limit || -1 === $memory_limit || '-1' === $memory_limit ) {
			// Unlimited, set to 32GB.
			$memory_limit = '32G';
		}

		return ActionScheduler_Compatibility::convert_hr_to_bytes( $memory_limit );
	}

	/**
	 * Memory exceeded
	 *
	 * Ensures the batch process never exceeds 90% of the maximum WordPress memory.
	 *
	 * Based on WP_Background_Process::memory_exceeded()
	 *
	 * @return bool
	 */
	protected function memory_exceeded() {

		$memory_limit    = $this->get_memory_limit() * 0.90;
		$current_memory  = memory_get_usage( true );
		$memory_exceeded = $current_memory >= $memory_limit;

		return apply_filters( 'action_scheduler_memory_exceeded', $memory_exceeded, $this );
	}

	/**
	 * See if the batch limits have been exceeded, which is when memory usage is almost at
	 * the maximum limit, or the time to process more actions will exceed the max time limit.
	 *
	 * Based on WC_Background_Process::batch_limits_exceeded()
	 *
	 * @param int $processed_actions The number of actions processed so far - used to determine the likelihood of exceeding the time limit if processing another action
	 * @return bool
	 */
	protected function batch_limits_exceeded( $processed_actions ) {
		return $this->memory_exceeded() || $this->time_likely_to_be_exceeded( $processed_actions );
	}

	/**
	 * Process actions in the queue.
	 *
	 * @author Jeremy Pry
	 * @param string $context Optional identifer for the context in which this action is being processed, e.g. 'WP CLI' or 'WP Cron'
	 *        Generally, this should be capitalised and not localised as it's a proper noun.
	 * @return int The number of actions processed.
	 */
	abstract public function run( $context = '' );
}