Putting out the way I handled this down here. Below is based on the discussion with @Rp- and suggestions made here.
Three major elements went into configuring this:
- Spring's session scoped beans
- package-info.java
- Spring AOP
I created a session scoped Spring bean that will hold my user selected variable. The variable would get modified upon user's request through a spring Controller mapping method. Being held in a spring managed bean, I have access to the session variable anywhere in my application by virtue of spring's dependency injection.
@Component
@Scope(value="session", proxyMode=ScopedProxyMode.TARGET_CLASS)
public class SessionParam implements Serializable{
private String sessParam;
..
..
}
Next I define my hibernate filter at package level.
This is done in package-info.java file. All entities in this package thus inherit this filter.
@FilterDef(name="GLOBAL_FILTER", parameters = {@ParamDef(name="sessParam", type="string")},
defaultCondition = "sessParam = :sessParam")
package com.company.app.entity;
import org.hibernate.annotations.FilterDef;
import org.hibernate.annotations.FilterDefs;
import org.hibernate.annotations.ParamDef;
Entities in the package are annotated with hibernate's @Filter annotation as below:
@Entity
@Filter(name="GLOBAL_FILTER")
@Table(name = "TABLE_XYZ", schema = "SCHEMA_ABC")
public class TableXyz implements Serializable {
...
}
Lastly, all DAO queries are intercepted using an AspectJ aspect on hibernate's Session Factory's getCurrentSession() method.
Below is the Aspect class.
@Aspect
@Component
public class GlobalFilter {
@Autowired
SessionParam sessionParam;
@Pointcut("execution(* org.hibernate.SessionFactory.getCurrentSession(..))")
protected void hibernateSessionFetch(){
}
@AfterReturning(pointcut = "hibernateSessionFetch()", returning = "result")
public void enableGlobalFilter(JoinPoint joinPoint, Object result){
Session session = (Session) result;
session.enableFilter("GLOBAL_FILTER").setParameter("sessParam", sessionParam.getSessParam());
}
}
All queries on entities with "GLOBAL_FILTER" now have a conditional check on the required variable. No explicit conditional checks in each query is required in the DAO methods.
