Hibernate key generator per model

Hibernate is designed to create a key generator instance for each model or each inheritance class tree. The logic is in the SessionFactoryImpl class:

while ( classes.hasNext() ) {
    PersistentClass model = (PersistentClass) classes.next();
    if ( !model.isInherited() ) {
 IdentifierGenerator generator = model.getIdentifier().createIdentifierGenerator(settings.getDialect(),
 settings.getDefaultCatalogName(), settings.getDefaultSchemaName(),
         (RootClass) model);
   identifierGenerators.put( model.getEntityName(), generator );
    }
}

This is quite flexible and customizable. Each table can configure a different sequence High Low key generator.