Change Multitenancy sessions manually - spring

Question

I need to create a multitenanacy application with ability to switch between schemas inside my java-code (not based on a user request).
I've read articles:
https://fizzylogic.nl/2016/01/24/make-your-spring-boot-application-multi-tenant-aware-in-2-steps/
http://www.greggbolinger.com/tenant-per-schema-with-spring-boot/
Solution works fine, when the schema is passed in Rest-request.
However I need to implement the following logic:
public void compare(String originalSchema, String secondSchema){
TenantContext.setCurrentTenant(originalSchema);
List<MyObject> originalData = myRepository.findData();
TenantContext.setCurrentTenant(secondSchema);
List<MyObject> migratedData = myRepository.findData();
}
The point is, that connection is not switched, when I manually set up TenenantContext. MultiTenantConnectionProviderImpl.getConnection is invoked only on the first call to my repository.
#Component
public class MultiTenantConnectionProviderImpl implements MultiTenantConnectionProvider {
#Override
public Connection getConnection(String tenantIdentifier) throws SQLException {
final Connection connection = getAnyConnection();
try {
connection.createStatement().execute( "ALTER SESSION SET CURRENT_SCHEMA = " + tenantIdentifier );
}
catch ( SQLException e ) {
throw new HibernateException(
"Could not alter JDBC connection to specified schema [" + tenantIdentifier + "]",e);
}
return connection;
}
}
Is it possible to force switching sessions?

Answer 1

Found a hard-coded solution.
#Service
public class DatabaseSessionManager {
#PersistenceUnit
private EntityManagerFactory entityManagerFactory;
public void bindSession() {
if (!TransactionSynchronizationManager.hasResource(entityManagerFactory)) {
EntityManager entityManager = entityManagerFactory.createEntityManager();
TransactionSynchronizationManager.bindResource(entityManagerFactory, new EntityManagerHolder(entityManager));
}
}
public void unbindSession() {
EntityManagerHolder emHolder = (EntityManagerHolder) TransactionSynchronizationManager
.unbindResource(entityManagerFactory);
EntityManagerFactoryUtils.closeEntityManager(emHolder.getEntityManager());
}
}
Each block, loading data in a new tenantContext should execute the following:
databaseSessionManager.unbindSession();
TenantContext.setCurrentTenant(schema);
databaseSessionManager.bindSession();
//execute selects

Answer 2

Well, you need it
public interface Service {
List<MyObject> myObjects();
}
#Service
#Transactional(propagation = Propagation.REQUIRES_NEW)
public class ServiceImpl implements Service {
#Autowired
private MyRepository myRepository;
#Override
public List<MyObject> myObjects() {
return myRepository.findData();
}
}
#Service
public class AnotherService() {
#Autowired
private Service service;
public void compare(String originalSchema, String secondSchema){
TenantContext.setCurrentTenant(originalSchema);
List<MyObject> originalData = service.myObjects();
TenantContext.setCurrentTenant(secondSchema);
List<MyObject> migratedData = service.myObjects();
}
}

Answer 3

Try using
spring.jpa.open-in-view=false
in your application.properties file.
More info on this
What is this spring.jpa.open-in-view=true property in Spring Boot?
Hope this helps..