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✏️ Editing: BatchProcessorInterface.php

<?php
/**
 * Interface for batch data processors. See the BatchProcessingController class for usage details.
 */

namespace Automattic\WooCommerce\Internal\BatchProcessing;

/**
 * Interface BatchProcessorInterface
 *
 * @package Automattic\WooCommerce\Internal\BatchProcessing
 */
interface BatchProcessorInterface {

/**
	 * Get a user-friendly name for this processor.
	 *
	 * @return string Name of the processor.
	 */
	public function get_name() : string;

/**
	 * Get a user-friendly description for this processor.
	 *
	 * @return string Description of what this processor does.
	 */
	public function get_description() : string;

/**
	 * Get the total number of pending items that require processing.
	 * Once an item is successfully processed by 'process_batch' it shouldn't be included in this count.
	 *
	 * Note that the once the processor is enqueued the batch processor controller will keep
	 * invoking `get_next_batch_to_process` and `process_batch` repeatedly until this method returns zero.
	 *
	 * @return int Number of items pending processing.
	 */
	public function get_total_pending_count() : int;

/**
	 * Returns the next batch of items that need to be processed.
	 *
	 * A batch item can be anything needed to identify the actual processing to be done,
	 * but whenever possible items should be numbers (e.g. database record ids)
	 * or at least strings, to ease troubleshooting and logging in case of problems.
	 *
	 * The size of the batch returned can be less than $size if there aren't that
	 * many items pending processing (and it can be zero if there isn't anything to process),
	 * but the size should always be consistent with what 'get_total_pending_count' returns
	 * (i.e. the size of the returned batch shouldn't be larger than the pending items count).
	 *
	 * @param int $size Maximum size of the batch to be returned.
	 *
	 * @return array Batch of items to process, containing $size or less items.
	 */
	public function get_next_batch_to_process( int $size ) : array;

/**
	 * Process data for the supplied batch.
	 *
	 * This method should be prepared to receive items that don't actually need processing
	 * (because they have been processed before) and ignore them, but if at least
	 * one of the batch items that actually need processing can't be processed, an exception should be thrown.
	 *
	 * Once an item has been processed it shouldn't be counted in 'get_total_pending_count'
	 * nor included in 'get_next_batch_to_process' anymore (unless something happens that causes it
	 * to actually require further processing).
	 *
	 * @throw \Exception Something went wrong while processing the batch.
	 *
	 * @param array $batch Batch to process, as returned by 'get_next_batch_to_process'.
	 */
	public function process_batch( array $batch ): void;

/**
	 * Default (preferred) batch size to pass to 'get_next_batch_to_process'.
	 * The controller will pass this size unless it's externally configured
	 * to use a different size.
	 *
	 * @return int Default batch size.
	 */
	public function get_default_batch_size() : int;
}

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