interface MigrationInterface

interface MigrationInterface extends PluginInspectionInterface, DerivativeInspectionInterface {
    
    /**
     * The migration is currently not running.
     */
    const STATUS_IDLE = 0;
    
    /**
     * The migration is currently importing.
     */
    const STATUS_IMPORTING = 1;
    
    /**
     * The migration is currently being rolled back.
     */
    const STATUS_ROLLING_BACK = 2;
    
    /**
     * The migration is being stopped.
     */
    const STATUS_STOPPING = 3;
    
    /**
     * The migration has been disabled.
     */
    const STATUS_DISABLED = 4;
    
    /**
     * Migration error.
     */
    const MESSAGE_ERROR = 1;
    
    /**
     * Migration warning.
     */
    const MESSAGE_WARNING = 2;
    
    /**
     * Migration notice.
     */
    const MESSAGE_NOTICE = 3;
    
    /**
     * Migration info.
     */
    const MESSAGE_INFORMATIONAL = 4;
    
    /**
     * All records have been processed.
     */
    const RESULT_COMPLETED = 1;
    
    /**
     * The process has stopped itself (e.g., the memory limit is approaching).
     */
    const RESULT_INCOMPLETE = 2;
    
    /**
     * The process was stopped externally (e.g., via drush migrate-stop).
     */
    const RESULT_STOPPED = 3;
    
    /**
     * The process had a fatal error.
     */
    const RESULT_FAILED = 4;
    
    /**
     * Dependencies are unfulfilled - skip the process.
     */
    const RESULT_SKIPPED = 5;
    
    /**
     * This migration is disabled, skipping.
     */
    const RESULT_DISABLED = 6;
    
    /**
     * An alias for getPluginId() for backwards compatibility reasons.
     *
     * @return string
     *   The plugin ID of the plugin instance.
     *
     * @see \Drupal\migrate\Plugin\MigrationInterface::getPluginId()
     */
    public function id();
    
    /**
     * Get the plugin label.
     *
     * @return string
     *   The label for this migration.
     */
    public function label();
    
    /**
     * Get a list of required plugin IDs.
     *
     * @return string[]
     */
    public function getRequirements() : array;
    
    /**
     * Returns the initialized source plugin.
     *
     * @return \Drupal\migrate\Plugin\MigrateSourceInterface
     *   The source plugin.
     */
    public function getSourcePlugin();
    
    /**
     * Returns the process plugins.
     *
     * @param array|null $process
     *   (Optional) A process configuration array. Defaults to NULL. If specified,
     *   then the plugins from the given process array are returned. If not
     *   specified, then the plugins from this migration's process array are
     *   returned.
     *
     * @return \Drupal\migrate\Plugin\MigrateProcessInterface[][]
     *   An associative array. The keys are the destination property names. Values
     *   are process pipelines. Each pipeline contains an array of plugins.
     */
    public function getProcessPlugins(?array $process = NULL);
    
    /**
     * Returns the initialized destination plugin.
     *
     * @param bool $stub_being_requested
     *   TRUE to indicate that this destination will be asked to construct a stub.
     *
     * @return \Drupal\migrate\Plugin\MigrateDestinationInterface
     *   The destination plugin.
     */
    public function getDestinationPlugin($stub_being_requested = FALSE);
    
    /**
     * Returns the initialized id_map plugin.
     *
     * @return \Drupal\migrate\Plugin\MigrateIdMapInterface
     *   The ID map.
     */
    public function getIdMap();
    
    /**
     * Check if all source rows from this migration have been processed.
     *
     * @return bool
     *   TRUE if this migration is complete otherwise FALSE.
     */
    public function allRowsProcessed();
    
    /**
     * Set the current migration status.
     *
     * @param int $status
     *   One of the STATUS_* constants.
     */
    public function setStatus($status);
    
    /**
     * Get the current migration status.
     *
     * @return int
     *   The current migration status. Defaults to STATUS_IDLE.
     */
    public function getStatus();
    
    /**
     * Retrieve a label for the current status.
     *
     * @return string
     *   User-friendly string corresponding to a STATUS_ constant.
     */
    public function getStatusLabel();
    
    /**
     * Get the result to return upon interruption.
     *
     * @return int
     *   The current interruption result. Defaults to RESULT_INCOMPLETE.
     */
    public function getInterruptionResult();
    
    /**
     * Clears the result to return upon interruption.
     */
    public function clearInterruptionResult();
    
    /**
     * Sets the migration status as interrupted with a given result code.
     *
     * @param int $result
     *   One of the MigrationInterface::RESULT_* constants.
     */
    public function interruptMigration($result);
    
    /**
     * Gets the normalized process plugin configuration.
     *
     * The process configuration is always normalized. All shorthand processing
     * will be expanded into their full representations.
     *
     * @see https://www.drupal.org/node/2129651#get-shorthand
     *
     * @return array
     *   The normalized configuration describing the process plugins.
     */
    public function getProcess();
    
    /**
     * Allows you to override the entire process configuration.
     *
     * @param array $process
     *   The entire process pipeline configuration describing the process plugins.
     *
     * @return $this
     */
    public function setProcess(array $process);
    
    /**
     * Set the process pipeline configuration for an individual destination field.
     *
     * This method allows you to set the process pipeline configuration for a
     * single property within the full process pipeline configuration.
     *
     * @param string $property
     *   The property of which to set the process pipeline configuration.
     * @param mixed $process_of_property
     *   The process pipeline configuration to be set for this property.
     *
     * @return $this
     *   The migration entity.
     */
    public function setProcessOfProperty($property, $process_of_property);
    
    /**
     * Merge the process pipeline configuration for a single property.
     *
     * @param string $property
     *   The property of which to merge the passed in process pipeline
     *   configuration.
     * @param array $process_of_property
     *   The process pipeline configuration to be merged with the existing process
     *   pipeline configuration.
     *
     * @return $this
     *   The migration entity.
     */
    public function mergeProcessOfProperty($property, array $process_of_property);
    
    /**
     * Get the dependencies for this migration.
     *
     * @return array
     *   The dependencies for this migrations.
     */
    public function getMigrationDependencies();
    
    /**
     * Get the destination configuration, with at least a 'plugin' key.
     *
     * @return array
     *   The destination configuration.
     */
    public function getDestinationConfiguration();
    
    /**
     * Get the source configuration, with at least a 'plugin' key.
     *
     * @return array
     *   The source configuration.
     */
    public function getSourceConfiguration();
    
    /**
     * The destination identifiers.
     *
     * An array of destination identifiers: the keys are the name of the
     * properties, the values are dependent on the ID map plugin.
     *
     * @return array
     *   Destination identifiers.
     */
    public function getDestinationIds();
    
    /**
     * The migration tags.
     *
     * @return array
     *   Migration tags.
     */
    public function getMigrationTags();
    
    /**
     * Indicates if the migration is auditable.
     *
     * @return bool
     */
    public function isAuditable();

}