I need to do some database processing in revision listener of hibernate-envers. For that I need inejction capabilities of Spring Framework. How can this be implemented? Here is the code representing the need but CustomRevisionListener is instantiated by a constructor in Envers code. Spring has only SecurityContextHolder
as static service locator. How to inject other beans?
@Service
public class CustomRevisionListener implements EntityTrackingRevisionListener {
@Resource
private PersistenceManagerHibernate persistenceManagerHibernate;
public void newRevision(Object revisionEntity) {
CustomRevisionEntity revision = (CustomRevisionEntity) revisionEntity;
revision.setUsername(getUsername());
}
public String getUsername() {
final SecurityContext context = SecurityContextHolder.getContext();
if (context != null) {
if (context.getAuthentication() != null) {
return context.getAuthentication().getName();
} else {
return "anonymous";
}
}
return "anonymous";
}
@Override
public void entityChanged(@SuppressWarnings("rawtypes") Class entityClass, String entityName, Serializable entityId, RevisionType revisionType, Object revisionEntity) {
CustomRevisionEntity revision = (CustomRevisionEntity) revisionEntity;
revision.setEntityId(entityId.toString());
revision.setEntityName(entityName);
revision.setRevisionType((int)revisionType.getRepresentation());
Auditable auditable = null;
if (entityId instanceof Long) {
auditable = persistenceManagerHibernate.findById(entityClass, (Long)entityId);
}
revision.setGroupName(auditable.getAuditGroupName());
revision.setGroupEntityId(auditable.getAuditGroupId());
}
}
Since CustomRevisionListener is instantiated by a constructor in Envers, you have to find another way to retrieve a handle to a Spring managed bean.
You could create a utility class to achieve this:
/**
* Utility class which provides lookup services for Spring managed beans from
* within unmanaged beans.
*/
@Component
public class ContextLookup implements ApplicationContextAware {
private static ApplicationContext sApplicationContext;
@Override
public void setApplicationContext( ApplicationContext aApplicationContext )
throws BeansException {
setContext( aApplicationContext );
}
public static void setContext( ApplicationContext aApplicationContext ) {
sApplicationContext = aApplicationContext;
}
protected static ApplicationContext getApplicationContext() {
return sApplicationContext;
}
public static Object getBean( String aName ) {
if ( sApplicationContext != null ) {
return sApplicationContext.getBean( aName );
}
return null;
}
public static <T> T getBean( Class<T> aClass ) {
if ( sApplicationContext != null ) {
return sApplicationContext.getBean( aClass );
}
return null;
}
}
and in your CustomRevisionListener
public class CustomRevisionListener {
public void myMethod() {
..
// get a handle to your spring managed bean
Foo foo = (Foo)ContextLookup.getBean( "mySpringManagedBean" );
..
}
}
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