8 Replies Latest reply: Feb 27, 2004 9:45 AM by Scott Stark RSS

EJB Timer Service

Ivelin Ivanov Expert

Is somebody interested in making helping out with the EJB Timer services?

1) Transaction support is needed
2) Entity needs to keep ContainerTimerService map as a WeakValueHashMap
(see org.jboss.util)
3) Scott also seems to want to use quartz as our new scheduler and this
would effect EJB Timer Service as well.

Let me know,

Thanks,

Bill Burke

  • 1. Re: EJB Timer Service
    Bill Burke Master

    Hi Bill,

    I helped you isolate a thread sync bug in the EJB deadlock detector back in the early JBoss 3.0 cycle.

    Subsequently I fixed the CMP BLOB handling in 3.0 and 3.2 and also added test cases that demonstrated some bugs.

    I'll have a look at the existing implementation and drop Thomas a line.

    Steve Coy

  • 2. Re: 3.2.4 Release Tasks
    Stephen Coy Novice

    Hi Ivelin,

    The idea is to add support for CMT transaction time-out config in jboss.xml
    Something like:

     <assembly-descriptor>
     <container-transaction>
     <method>
     <ejb-name>StatelessSessionBean</ejb-name>
     <method-name>*</method-name>
     </method>
     <transaction-timeout>2000</transaction-timeout>
     </container-transaction>
     <container-transaction>
     <method>
     <ejb-name>StatelessSessionBean</ejb-name>
     <method-name>takesALongTime</method-name>
     </method>
     <transaction-timeout>10000</transaction-timeout>
     </container-transaction>
     </assembly-descriptor>
    </jboss>
    


    You can use TransactionManager.setTransactionTimeout() to set the thread local
    to accomplish this, but...
    There is no portable mechanism to reset the value.
    You cannot get the previous value or the default value.

    This would require an alternate interface on our TxManager
    and probably just drop the feature when a third party transaction manager
    does not implement the interface.
    e.g.

    public interface org.jboss.tm.TransactionManagerExtensions
    {
    long getTransactionTImeout()
    }

  • 3. Re: tools for reporting
    Everton T B Araujo Newbie

     

    "nraghuram" wrote:
    thanks. I was looking for OLAP tools
    raghu


    Someone referred to Mondrian, which is an OLAP engine.

    JPivot, also on SourceForge, is an OLAP UI that utilizes Mondrian.


    Sherman

  • 4. EJB remoting solution
    Scott Stark Master

    Can anyone have the success story of connect to EJB over rmi/iiop transport?

    Can I get the connection to EJB over "pure" corba iiop transport? (generating client stubs from IDL, initialize ORB, etc.) I try but get CORBA BAD_PARAM errors :((

    If I use the rmi/iiop transport (solution from http://www.jboss.org/developers/projects/jboss/IIOP)
    I get the ClassCastException :((
    My client code in this case:

    public static void main(String[] args) {
    lbsGW = getEjb();
    }

    private static LbsGWu getEjb() throws NamingException, CreateException, RemoteException {
    javax.naming.Context context = getContext();
    System.out.println("after getContext");
    java.lang.Object obj = context.lookup("LbsGWUniformHomeRemote");
    if(obj != null) {
    try {
    return ((LbsGWuHome) javax.rmi.PortableRemoteObject.narrow(obj,LbsGWuHome.class)).create();
    }catch (Exception e) {
    e.printStackTrace();
    return null;
    }
    }
    return null;
    }


    private static javax.naming.Context getContext() throws NamingException {

    Properties p = new Properties();
    p.put(javax.naming.Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.cosnaming.CNCtxFactory");
    p.put(javax.naming.Context.PROVIDER_URL, "corbaloc:iiop:localhost:3528/JBoss/Naming/root");
    System.out.println("create InitialContext");

    try {
    javax.naming.Context ctx= new InitialContext(p);

    return ctx;
    }catch (Exception e) {
    e.printStackTrace();
    return null;
    }
    }

    LbsGWuHome and LbsGWu - home and remote EJB interfaces, generates from XDoclet.

    exception rises in return ((LbsGWuHome) javax.rmi.PortableRemoteObject.narrow(obj,LbsGWuHome.class)).create();
    step



  • 5. Re: EJB Timer Service
    Stephen Coy Novice

    Did anyone pick this up? If not, I am interested.

    Steve Coy

  • 6. Re: EJB Timer Service
    Stephen Coy Novice

    Hi Bill,

    I helped you isolate a thread sync bug in the EJB deadlock detector back in the early JBoss 3.0 cycle.

    Subsequently I fixed the CMP BLOB handling in 3.0 and 3.2 and also added test cases that demonstrated some bugs.

    I'll have a look at the existing implementation and drop Thomas a line.

    Steve Coy

  • 7. Re: EJB Timer Service
    Stephen Coy Novice

     

    "Bill Burke" wrote:

    tdiesler@jboss.org


    Bill,

    Thomas is not responding on this address. I can see that he has been active from the CVS checkins, although not in this area.

    Steve Coy


  • 8. Re: EJB Timer Service
    Bill Burke Master

    try

    Thomas Diesler <thomas.diesler@jboss.org>

    What is your email?