I all,
i try to implement a sevice to booking a room.
I must to deploiy it on jboss 3.2.7 and i use CMT
The problem is when 2 client A, B call at same time booking method:
1)A: call "booking" with big Collection, order by date, include booking for
tomorrow
2) A: call "verifyAvaibleBooking(bookingVO)" and nobody booking for tomorrow
3) B: call "booking" with only booking for tomorrow
A: continues to verifyAvaibleBooking
4) B call "verifyAvaibleBooking(bookingVO)" and nobody booking for tomorrow and
create a booking for tomorrow
5) A: terminate to verifyAvaibleBooking and create booking
At the end of this computation i have 2 booking for tomorrow on the same room!
This is my bookingBean:
| /* @ejb.bean name="Booking" display-name="Name for Booking"
| * description="Description for Booking" jndi-name="ejb/Booking"
| * local-jndi-name = "ejb/BookingLocal" type="CMP"
cmp-version="2.x"
| * view-type="local" primkey-field = "id"
| *
| */
|
| public abstract class BookingBean implements EntityBean {
| //every get method have this tag
| /**
| * Getter for CMP Field id
| *
| * @ejb.persistent-field
| * @ejb.interface-method view-type="local"
| *
| */
| set...();
| get...();
| }
|
Now i have a Stateful antity bean to manage previews bean:
| **
| * @ejb.bean name="ManageBooking" display-name="Name for ManageBooking"
| * description="Description for ManageBooking"
| * jndi-name="ejb/ManageBooking" type="Stateful" view-type="both"
| *
| * @ejb.resource-ref res-ref-name="jdbc/DefaultDS"
| * res-type="javax.sql.Datasource"
| * res-auth="Container"
| *
| [EMAIL PROTECTED] res-ref-name="jdbc/DefaultDS"
| * jndi-name="java:/DefaultDS"
| *
| * @jboss.container-configuration name="Standard Stateful SessionBean"
| *
| * @ejb.ejb-ref ejb-name="Booking" view-type="local"
ref-name="ejb/BookingLocal"
| *
| * @ejb.ejb-ref ejb-name="User" view-type="local" ref-name="ejb/UserLocal"
| *
| * @ejb.ejb-ref ejb-name="ClassRoom" view-type="local"
| * ref-name="ejb/ClassRoomLocal"
| *
| * @ejb.ejb-ref ejb-name="Privilege" view-type="local"
| * ref-name="ejb/PrivilegeLocal"
| *
| * @ejb.ejb-ref ejb-name="MyConstraint" view-type="local"
| * ref-name="ejb/MyConstraintLocal"
| *
| */
| public abstract class ManageBookingBean implements SessionBean{
|
| //Define some variable
|
| /**
| * Sets the session context
| * @param javax.ejb.SessionContext the new ctx value
| * @ejb.method setSessionContext
| **/
| public void setSessionContext(SessionContext ctx) throws EJBException,
| RemoteException {
| this.ctx = ctx;
| }
|
| /**
| * Unsets the session context
| * @param javax.ejb.SessionContext ctx value
| * @ejb.method unsetSessionContext
| */
| public void unsetSessionContext() {
| this.ctx=null;
| }
|
| /**
| * Default create method
| *
| * @throws CreateException
| * @ejb.create-method
| */
| public void ejbCreate() throws CreateException {
| try {
| userLocalHome = UserUtil.getLocalHome();
| classRoomLocalHome = ClassRoomUtil.getLocalHome();
| bookingLocalHome = BookingUtil.getLocalHome();
| constraintLocalHome = MyConstraintUtil.getLocalHome();
| } catch (NamingException e) {
| // TODO Auto-generated catch block
| e.printStackTrace();
| }
| }
|
|
| //There are some (not transaction) method
|
| /**
| * Business method
| *
| * @ejb.interface-method view-type = "remote"
| * @ejb.transaction type = "Required"
| */
| public String booking(Collection bookingVO) {
| .....
| }
| }
|
This is a booking mathod:
| /**
| * Business method
| *
| * @ejb.interface-method view-type = "remote"
| * @ejb.transaction type = "Required"
| */
| public String booking(Collection bookingVO) {
| UserLocal userBean = null;
| ClassRoomLocal classRoomBean = null;
| Iterator iter;
|
| // Verifico la disponibilità
| Collection collBooking = verifyAvaibleBooking(bookingVO);
|
| if (collBooking.isEmpty()) {
| String tmp = computeConstraint(bookingVO);
| if (tmp.startsWith("Danied")) {
| return tmp;
| }
| iter = bookingVO.iterator();
| while (iter.hasNext()) {
| BookingValue booking = (BookingValue)
iter.next();
| try {
| userBean =
userLocalHome.findByPrimaryKey(booking.getUser()
| .getUserName());
| classRoomBean =
classRoomLocalHome.findByPrimaryKey(booking
|
.getClassRoom().getName());
| } catch (FinderException e1) {
| // TODO Auto-generated catch block
| e1.printStackTrace();
| }
| try {
| BookingLocal bookingBean =
bookingLocalHome.create();
| bookingBean.setBookingValue(booking);
| bookingBean.setClassRoom(classRoomBean);
| bookingBean.setUser(userBean);
| } catch (CreateException e) {
| Costanti.debug("Errore nella creazione
delle prenotazione");
| ctx.setRollbackOnly();
| }
| }
| } else {
| return Costanti.DANIED_BOOKING
| + "<br>Impossibile effettuare la
prenotazione"
| + "<br>Ci sono altre prenotazioni negli
stessi orari e nelle stesse aule";
| }
| return Costanti.OK_BOOKING + "<br>Prenotazione effettuata con
successo";
| }
|
|
How can I make to resolve this problem?
I know that i can use UserTransaction but i'm know that CMT make this for me!
Someone can say me because i have this problem?
Thanks for your help everyone
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