Package io.permazen.core

Interface SchemaChangeListener

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface SchemaChangeListener

Listener interface for notifications that an object's schema has been changed to match the current transaction.

See Also:

• Transaction.addSchemaChangeListener()

Method Summary

Modifier and Type	Method	Description
void	onSchemaChange(Transaction tx, ObjId id, SchemaId oldVersion, SchemaId newVersion, Map<String,Object> oldFieldValues)	Receive notification of an object schema change.

Method Details

onSchemaChange

void onSchemaChange(Transaction tx,
 ObjId id,
 SchemaId oldVersion,
 SchemaId newVersion,
 Map<String,Object> oldFieldValues)

Receive notification of an object schema change.

Notifications are delivered in the same thread that first reads the object, before the operation that triggered the schema change returns.

Parameters:

tx - associated transaction

id - the ID of the updated object

oldVersion - previous schema ID

newVersion - new schema ID

oldFieldValues - read-only mapping of the values of all fields in the old schema keyed by name