Hi,
I'm trying to create a session bean that checks the contents of a potential new
record against a table before adding that record to the table. The table is a
list of (funnily enough) hotel bookings. I want to make sure that the booking
dates don't clash for a particular room. Because a booking has a start date and
end date, it's not sufficient to have a compound primary key based on dates.
I'm using EJB3 on JBOSS 4
If I were doing it in normal java it would look something like:
| List<Booking> bookings = ....
| Object bookingLock = new Object();
|
|
| public void create(Boooking booking) {
| synchronized(bookingLock) {
| if (!roomBookedForInterval(booking)) {
| saveBooking(booking)
| }
| }
| }
|
| private boolean roomBookedForInterval(Booking booking) {
| for(Booking b : bookings) {
| if (b.endDate() > booking.startDate() ||
| b.startDate() < booking.endDate() ) {
|
| return true;
| }
| }
|
| return false;
| }
|
| private void saveBooking(Booking booking) {
| bookings.add(booking);
| }
|
|
|
My question is, what is the EJB3 equivalent of the synchronized{} block? IS it
a transaction? If so, how does it work?
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