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<?php
namespace Drupal\migrate_drupal\Plugin;
/**
* Interface for migrations with follow-up migrations.
*
* Some migrations need to be derived and executed after other migrations have
* been successfully executed. For example, a migration might need to be derived
* based on previously migrated data. For such a case, the migration dependency
* system is not enough since all migrations would still be derived before any
* one of them has been executed.
*
* Those "follow-up" migrations need to be tagged with the "Follow-up migration"
* tag (or any tag in the "follow_up_migration_tags" configuration) and thus
* they won't be derived with the other migrations.
*
* To get those follow-up migrations derived at the right time, the migrations
* on which they depend must implement this interface and generate them in the
* generateFollowUpMigrations() method.
*
* When the migrations implementing this interface have been successfully
* executed, the follow-up migrations will then be derived having access to the
* now migrated data.
*/
interface MigrationWithFollowUpInterface {
/**
* Generates follow-up migrations.
*
* When the migration implementing this interface has been succesfully
* executed, this method will be used to generate the follow-up migrations
* which depends on the now migrated data.
*
* @return \Drupal\migrate\Plugin\MigrationInterface[]
* The follow-up migrations.
*/
public function generateFollowUpMigrations();
}