I am using spring boot and I am using spring session where spring creates a session in APP_SESSION table and adds rows into it. It has max_inactive_interval column which has some seconds value in it after which the session gets timed out. Now I want to do something before session times out. I wan to perform some database operation on different table and set a flag.
I have used JdbcOperationsSessionRepository for this
#Bean
#Order(1)
public JdbcOperationsSessionRepository sessionRepository(
#Qualifier("springSessionJdbcOperations") JdbcOperations jdbcOperations,
PlatformTransactionManager transactionManager) {
JdbcOperationsSessionRepository repository = super.sessionRepository(jdbcOperations, transactionManager);
repository.setDefaultMaxInactiveInterval(maxInactiveIntervalInSeconds);
repository.setTableName(TABLE_NAME);
return repository;
}
I have tried this
#Bean // bean for http session listener
public HttpSessionListener aohttpSessionListener() {
return new HttpSessionListener() {
#Override
public void sessionCreated(HttpSessionEvent session) { // This method will be called when session created
System.out.println("Session Created with session id+" + session.getSession().getId());
}
#Override
public void sessionDestroyed(HttpSessionEvent session) { // This method will be automatically called when session destroyed
System.out.println("Session Destroyed, Session id:" + session.getSession().getId());
// database operations
}
}
};
But it does not work I guess according to this https://github.com/spring-projects/spring-session/issues/1082
Any help is appreciated. Thanks in advance.
Spring Session JDBC does not support publishing of session events. Only Spring Session Redis supports that.
Source code comment on line 68
Related
I add my object to the session like this:
session.setAttribute("bucket", new ArrayList<ProductDto>());
I would like to know if it is possible to set the time for the life of this object. Ie, for example, after an hour it will be automatically destroyed
If you mean "http servlet session" for "session", then there is no way to configure timeout for individual attribute, no matter is it spring or not. You can only timeout the whole session.
If you use pure spring and servlet web application - configure session timeout in web.xml.
If you mean "spring-boot" for "spring", configure session timeout as written here:
you can set session time out in your application.properties file
server.session.timeout=1000 # session timeout in second
server.session.cookie.max-age=1000 # Maximum age of the session cookie in seconds. also add if server.session.timeout not working
refer:https://javadeveloperzone.com/spring-boot/spring-boot-tomcat-session-timeout/
You can use cache manager to acheive that:
#EnableCaching
#Configuration
public class CacheConfiguration implements CachingConfigurer {
#Override
public CacheManager cacheManager() {
ConcurrentMapCacheManager cacheManager = new ConcurrentMapCacheManager() {
#Override
protected Cache createConcurrentMapCache(final String name) {
return new ConcurrentMapCache(name,
CacheBuilder.newBuilder().expireAfterWrite(30, TimeUnit.MINUTES).maximumSize(100).build().asMap(), false);
}
};
return cacheManager;
}
#Override
public KeyGenerator keyGenerator() {
return new DefaultKeyGenerator();
}
}
I have a springboot application, with its own datasource (let's call DB1) set on properties working fine.
But this application needs do configure a new datasource (DB2), using some parameters the user have informed before and stored in DB1.
My idea is to create a named bean, so a specific part of my application can use to access DB2 tables. I think it is possible to do that by restarting the application, but I would like to avoid it though.
Besides, I need that some part of my code use the new datasource (spring data jpa, mappings, and so on). I don't know if this matter, but it is a web application, so I cannot create the datasource only for the request thread.
Can you help me?
Thanks in advance.
Spring has dynamic datasource routing if that's where you are headed. In my case it is the same schema (WR/RO)
public class RoutingDataSource extends AbstractRoutingDataSource {
#Autowired
private DataSourceConfig dataSourceConfig;
#Override
protected Object determineCurrentLookupKey() {
return DbContextHolder.getDbType();
}
public enum DbType {
MASTER, WRITE, READONLY,
}
Then you need a custom annotation and an aspect
#Target({ElementType.METHOD, ElementType.TYPE})
#Retention(RetentionPolicy.RUNTIME)
public #interface ReadOnlyConnection {
}
#Aspect
#Component
#Order(1)
public class ReadOnlyConnectionInterceptor {
Pointcut(value = "execution(public * *(..))")
public void anyPublicMethod() {}
#Around("#annotation(readOnlyConnection)")
public Object proceed(ProceedingJoinPoint proceedingJoinPoint, ReadOnlyConnection readOnlyConnection) throws Throwable {
Object result = null;
try {
DbContextHolder.setDbType(DbType.READONLY);
result = proceedingJoinPoint.proceed();
DbContextHolder.clearDbType();
return result;
} finally {
DbContextHolder.clearDbType();
}
}
}
And then you can act on you DB with the tag #ReadOnlyConnection
#Override
#Transactional(readOnly = true)
#ReadOnlyConnection
public UnitDTO getUnitById(Long id) {
return unitRepository.findOne(id);
}
An example can be found here: https://github.com/afedulov/routing-data-source.
I used that as a basis for my work although it is still in progress because I still need to resolve runtime dependencies ( i.e. hibernate sharding ).
Now I use JPA in my web application. And I have a class like this:
class A {
...
#OneToMany
private List<B> list;
...
}
When it is in a HTTP request, I can use a.getList() successful. But in a schedule thread, it throws the exception:
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: A.list, could not initialize proxy - no Session
Can I keep the session in the schedule thread just like the http request thread?
Actually, when spring handle the http request, it start the transaction by the interceptor org.springframework.orm.hibernate3.support.OpenSessionInViewInterceptor or the filter org.springframework.orm.hibernate3.support.OpenSessionInViewFilter. So if we want to keep the session, we can start and commit the transaction by our self.
Here is the code:
public class BackendThread {
#Autowired
private PlatformTransactionManager platformTransactionManager;
#Override
public void onMessage(Message message, byte[] pattern) {
new TransactionTemplate(platformTransactionManager).execute(new TransactionCallback<Void>() {
#Override
public Void doInTransaction(TransactionStatus transactionStatus) {
...
your code here
...
return null;
}
});
}
}
TransactionTemplate is helpful if you use JPA. I didn't use it and created a session/transactions on my own in background thread, so that each task had its own environment:
Inject entity manager or get it from Spring context or pass it as reference:
#PersistenceContext
private EntityManager entityManager;
Then create a new entity manager, to avoid using a shared one:
EntityManager em = entityManager.getEntityManagerFactory().createEntityManager();
Now you can start transaction and use Spring DAO, Repository, JPA, etc
private void save(EntityManager em) {
try
{
em.getTransaction().begin();
<your database changes>
em.getTransaction().commit();
}
catch(Throwable th) {
em.getTransaction().rollback();
throw th;
}
}
I'm using Spring with a Test-Configuration that gives my an InProcessServer Neo4j Database that i use for testing.
Sadly, after each #Test method, there is still scrap-data in this database.
Is it possible to wipe this DB after each Test-Method?
You can inject the Session and use purgeDatabase() to delete everything from the database-
#Autowired
private Session session;
#After
public void clear() {
session.purgeDatabase();
}
Your config that extends Neo4jConfiguration should have
#Override
#Bean
public Session getSession() throws Exception {
return super.getSession();
}
I'm trying to setup a transactional ehcache, making use of Spring #Cacheable and #Transactional.
My caches work fine with #Cacheable, but as soon as i setup my cache to use a local transaction:
<cache name="currencyCodeMaps" maxElementsInMemory="100" overflowToDisk="false" timeToIdleSeconds="5" timeToLiveSeconds="600" memoryStoreEvictionPolicy="LRU" transactionalMode="local"/>
When I access the cache i get error:
net.sf.ehcache.transaction.TransactionException: transaction not started
even though the same method is annotated #Transactional.
My Spring transaction manager is:
org.springframework.orm.jpa.JpaTransactionManager
The ehcache documentation says local transactions are controlled explicitly:
Local transactions are not controlled by a Transaction Manager.
Instead there is an explicit API where a reference is obtained to a
TransactionController for the CacheManager using
cacheManager.getTransactionController() and the steps in the
transaction are called explicitly
But this will be hard, as I want to sync my ehcache transactions with DB transactions, and DB transactions are controlled by #Transactional.
Is there a way to get local Ehcache transactions to work with Spring #Transactional?
Yes, there is a way to achieve you goal.
Because you have 2 transactional resources (JTA and Ehcache) and do not use JTA you have to use compound transaction manager likeorg.springframework.data.transaction.ChainedTransactionManager from spring-data project
#Bean
public PlatformTransactionManager transactionManager() {
return new ChainedTransactionManager(ehcacheTransactionManager(), jpaTransactionManager());
}
#Bean
public EhcacheTransactionManager ehcacheTransactionManager() {
return new EhcacheTransactionManager(ehcacheManager().getTransactionController());
}
#Bean
public PlatformTransactionManager jpaTransactionManager() {
return new JpaTransactionManager(entityManagerFactory());
}
You need to specify which transaction manager should be use by default:
#Configuration
public class Configuration implements TransactionManagementConfigurer {
...
#Override
public PlatformTransactionManager annotationDrivenTransactionManager() {
return transactionManager();
}
...
}
EhcacheTransactionManager implementation
import net.sf.ehcache.TransactionController;
import net.sf.ehcache.transaction.local.LocalTransactionContext;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionException;
import org.springframework.transaction.support.AbstractPlatformTransactionManager;
import org.springframework.transaction.support.DefaultTransactionStatus;
public class EhcacheTransactionManager extends AbstractPlatformTransactionManager {
private TransactionController transactionController;
public EhcacheTransactionManager(TransactionController transactionController) {
this.transactionController = transactionController;
}
#Override
protected Object doGetTransaction() throws TransactionException {
return new EhcacheTransactionObject(transactionController.getCurrentTransactionContext());
}
#Override
protected void doBegin(Object o, TransactionDefinition transactionDefinition) throws TransactionException {
int timeout = transactionDefinition.getTimeout();
if (timeout != TransactionDefinition.TIMEOUT_DEFAULT) {
transactionController.begin(timeout);
} else {
transactionController.begin();
}
}
#Override
protected void doCommit(DefaultTransactionStatus defaultTransactionStatus) throws TransactionException {
transactionController.commit();
}
#Override
protected void doRollback(DefaultTransactionStatus defaultTransactionStatus) throws TransactionException {
transactionController.rollback();
}
public class EhcacheTransactionObject {
private LocalTransactionContext currentTransactionContext;
public EhcacheTransactionObject(LocalTransactionContext currentTransactionContext) {
this.currentTransactionContext = currentTransactionContext;
}
}
}
source code and test case can be found here
This solution has a significant drawback transaction coordinator of ehcache does not support suspend/resume operations so inner transactions (PROPAGATION_REQUIRES_NEW) are not possible. That is why I had to find another one.
Another option is not to use local ehcache transactions at all and use org.springframework.cache.transaction.AbstractTransactionSupportingCacheManager#setTransactionAware which decorates caches to postpone operations until the transaction end. But it has following drawbacks:
Evicted keys stay accessible inside transaction until transaction commit
putIfAbsent operation is not postponed
It was a problem for me, so I implemented this functionality in different way. Check 'me.qnox.springframework.cache.tx.TxAwareCacheManagerProxy', there problems described above was solved, in the same repository
You do not want local transactions, you want XA transactions, which are supported by Ehcache.
Have a look at the documentation for Ehcache 2.10.x or Ehcache 2.8.x.