use Drupal\migrate\Row;
/**
- * The base class for all source plugins.
+ * The base class for source plugins.
+ *
+ * Available configuration keys:
+ * - cache_counts: (optional) If set, cache the source count.
+ * - skip_count: (optional) If set, do not attempt to count the source.
+ * - track_changes: (optional) If set, track changes to incoming data.
+ * - high_water_property: (optional) It is an array of name & alias values
+ * (optional table alias). This high_water_property is typically a timestamp
+ * or serial id showing what was the last imported record. Only content with a
+ * higher value will be imported.
+ *
+ * The high_water_property and track_changes are mutually exclusive.
+ *
+ * Example:
+ *
+ * @code
+ * source:
+ * plugin: some_source_plugin_name
+ * cache_counts: true
+ * track_changes: true
+ * @endcode
+ *
+ * This example uses the plugin "some_source_plugin_name" and caches the count
+ * of available source records to save calculating it every time count() is
+ * called. Changes to incoming data are watched (because track_changes is true),
+ * which can affect the result of prepareRow().
+ *
+ * Example:
+ *
+ * @code
+ * source:
+ * plugin: some_source_plugin_name
+ * skip_count: true
+ * high_water_property:
+ * name: changed
+ * alias: n
+ * @endcode
+ *
+ * In this example, skip_count is true which means count() will not attempt to
+ * count the available source records, but just always return -1 instead. The
+ * high_water_property defines which field marks the last imported row of the
+ * migration. This will get converted into a SQL condition that looks like
+ * 'n.changed' or 'changed' if no alias.
*
* @see \Drupal\migrate\Plugin\MigratePluginManager
* @see \Drupal\migrate\Annotation\MigrateSource
* @return array
* An array of the data for this source.
*/
- protected abstract function initializeIterator();
+ abstract protected function initializeIterator();
/**
* Gets the module handler.
* Returns -1 if the source is not countable.
*
* @param bool $refresh
- * (optional) Whether or not to refresh the count. Defaults to FALSE.
+ * (optional) Whether or not to refresh the count. Defaults to FALSE. Not
+ * all implementations support the reset flag. In such instances this
+ * parameter is ignored and the result of calling the method will always be
+ * up to date.
*
* @return int
* The count.
$this->saveHighWater(NULL);
}
+ /**
+ * {@inheritdoc}
+ */
+ public function getSourceModule() {
+ if (!empty($this->configuration['source_module'])) {
+ return $this->configuration['source_module'];
+ }
+ elseif (!empty($this->pluginDefinition['source_module'])) {
+ return $this->pluginDefinition['source_module'];
+ }
+ return NULL;
+ }
+
}