private void registerIdentifierGenerators(StandardServiceRegistry ssr) {
    final StrategySelector strategySelector = ssr.getService(StrategySelector.class);

    // apply id generators
    final Object idGeneratorStrategyProviderSetting = buildTimeSettings
            .get(AvailableSettings.IDENTIFIER_GENERATOR_STRATEGY_PROVIDER);
    if (idGeneratorStrategyProviderSetting != null) {
        final IdentifierGeneratorStrategyProvider idGeneratorStrategyProvider = strategySelector
                .resolveStrategy(IdentifierGeneratorStrategyProvider.class, idGeneratorStrategyProviderSetting);
        final MutableIdentifierGeneratorFactory identifierGeneratorFactory = ssr
                .getService(MutableIdentifierGeneratorFactory.class);
        if (identifierGeneratorFactory == null) {
            throw persistenceException("Application requested custom identifier generator strategies, "
                    + "but the MutableIdentifierGeneratorFactory could not be found");
        }
        for (Map.Entry<String, Class<?>> entry : idGeneratorStrategyProvider.getStrategies().entrySet()) {
            identifierGeneratorFactory.register(entry.getKey(), entry.getValue());
        }
    }
}
 

private void configure(StandardServiceRegistry ssr, MergedSettings mergedSettings) {
	final StrategySelector strategySelector = ssr.getService( StrategySelector.class );

	// apply id generators
	final Object idGeneratorStrategyProviderSetting = configurationValues.remove( AvailableSettings.IDENTIFIER_GENERATOR_STRATEGY_PROVIDER );
	if ( idGeneratorStrategyProviderSetting != null ) {
		final IdentifierGeneratorStrategyProvider idGeneratorStrategyProvider =
				strategySelector.resolveStrategy( IdentifierGeneratorStrategyProvider.class, idGeneratorStrategyProviderSetting );
		final MutableIdentifierGeneratorFactory identifierGeneratorFactory = ssr.getService( MutableIdentifierGeneratorFactory.class );
		if ( identifierGeneratorFactory == null ) {
			throw persistenceException(
					"Application requested custom identifier generator strategies, " +
							"but the MutableIdentifierGeneratorFactory could not be found"
			);
		}
		for ( Map.Entry<String,Class<?>> entry : idGeneratorStrategyProvider.getStrategies().entrySet() ) {
			identifierGeneratorFactory.register( entry.getKey(), entry.getValue() );
		}
	}
}