Global hibernate filter on all database queries

Question

I am using Spring MVC and Hibernate for my web application. I am looking for a way to create a global hibernate filter of sorts that would apply to each query in my DAO clas

Answer 1

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

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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 {
...
}

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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());

    }
}

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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.