1.3 KiB
Extension Patterns
ExampleExtensionQBitProducer registers the QBit identity and calls applyTableCustomizations for the configured target. That method is the extension point: look up the table, validate that it exists, and call your customized ExampleTableCustomizer.
QTableMetaData table = qInstance.getTable(tableName);
if(table == null)
{
throw new QException("Target table not found: " + tableName);
}
new ExampleTableCustomizer().customize(table);
When implementing this method, add throws QException to its declaration. Run the config's validate(QInstance, List<String>) before registering metadata, and report validation errors rather than silently ignoring a missing target. The uncustomized template contains placeholders for this behavior.
For record hooks, use QQQ's existing table customizer interfaces or AbstractPreInsertCustomizer. Its apply(List<QRecord>) method returns the records for the next stage; register the customizer through the table's TableCustomizers.PRE_INSERT_RECORD role. Check the actual QQQ interface before adding another hook. Add tests proving that the intended table changes and invalid configurations are handled.