12.5.5. Custom Services

12.5.5.1. About Custom Services
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Once a org.hibernate.service.ServiceRegistry is built it is considered immutable; the services themselves might accept re-configuration, but immutability here means adding/replacing services. So another role provided by the org.hibernate.service.ServiceRegistryBuilder is to allow tweaking of the services that will be contained in the org.hibernate.service.ServiceRegistry generated from it.

There are two means to tell a org.hibernate.service.ServiceRegistryBuilder about custom services.

Implement a org.hibernate.service.spi.BasicServiceInitiator class to control on-demand construction of the service class and add it to the org.hibernate.service.ServiceRegistryBuilder via its addInitiator method.
Just instantiate the service class and add it to the org.hibernate.service.ServiceRegistryBuilder via its addService method.

Either approach the adding a service approach or the adding an initiator approach are valid for extending a registry (adding new service roles) and overriding services (replacing service implementations).

Example 12.22. Use ServiceRegistryBuilder to Replace an Existing Service with a Custom Service

   ServiceRegistryBuilder registryBuilder = new ServiceRegistryBuilder( bootstrapServiceRegistry );
   registryBuilder.addService( JdbcServices.class, new FakeJdbcService() ); 
   ServiceRegistry serviceRegistry = registryBuilder.buildServiceRegistry();


   public class FakeJdbcService implements JdbcServices{

       @Override
       public ConnectionProvider getConnectionProvider() {
           return null;
       }

       @Override
       public Dialect getDialect() {
           return null;
       }

       @Override
       public SqlStatementLogger getSqlStatementLogger() {
           return null;
       }

       @Override
       public SqlExceptionHelper getSqlExceptionHelper() {
           return null;
       }

       @Override
       public ExtractedDatabaseMetaData getExtractedMetaDataSupport() {
           return null;
       }

       @Override
       public LobCreator getLobCreator(LobCreationContext lobCreationContext) {
           return null;
       }

       @Override
       public ResultSetWrapper getResultSetWrapper() {
           return null;
       }
   }

   ServiceRegistryBuilder registryBuilder = new ServiceRegistryBuilder( bootstrapServiceRegistry );
   registryBuilder.addService( JdbcServices.class, new FakeJdbcService() ); 
   ServiceRegistry serviceRegistry = registryBuilder.buildServiceRegistry();


   public class FakeJdbcService implements JdbcServices{

       @Override
       public ConnectionProvider getConnectionProvider() {
           return null;
       }

       @Override
       public Dialect getDialect() {
           return null;
       }

       @Override
       public SqlStatementLogger getSqlStatementLogger() {
           return null;
       }

       @Override
       public SqlExceptionHelper getSqlExceptionHelper() {
           return null;
       }

       @Override
       public ExtractedDatabaseMetaData getExtractedMetaDataSupport() {
           return null;
       }

       @Override
       public LobCreator getLobCreator(LobCreationContext lobCreationContext) {
           return null;
       }

       @Override
       public ResultSetWrapper getResultSetWrapper() {
           return null;
       }
   }

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12.5.5. Custom Services

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12.5.5.1. About Custom Services
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