OK, I tried the above. Specifically, I wanted to make it so the hotel/booking
noejb example brings up the hotel list the first time you land on main.xhtml,
without starting a conversation. The hotel list is in session scope, in other
words, just like the booking list. Then the "View Hotel" links become plain
links with "hotelId" request parameters, for bookmarkability.
So I split HotelBookingAction into HotelListAction (SESSION scope, responsible
for the "hotels" datamodel) and HotelBookingAction (the editing methods, still
conversational). HotelListAction's find() method becomes a @Factory("hotels")
method. There is a new HotelFactory class, which creates the "hotel" component
from the "View Hotels" link. So the "View Hotel" links actually read
http://localhost:8080/tomcat-seam-noejb/hotel.jsf?hotelId=9 which is fine.
(HotelFactory was originally @Stateless but it started complaining about no
@JndiName, which I didn't want to have to mess with, so I just made it
@Scope(STATELESS).)
All of this works... EXCEPT for the interaction between the HotelFactory and
the HotelListAction. Basically, I want the "Next Hotel" and "Previous Hotel"
buttons in hotel.xhtml to work, regardless of whether I arrived at hotel.xhtml
from main.xhtml or from a bookmarked link. Somehow I need the HotelFactory
(the only bean that gets invoked when a bookmarked hotel.jsf link is loaded) to
be aware of "hotels" and "hotelIndex", so it can set "hotelIndex"
appropriately. Otherwise HotelListAction.nextHotel and
HotelListAction.previousHotel don't work properly.
Here's my stab at HotelFactory.
/**
| * Factory class to create a single hotel based on request parameter.
| */
| @Name("hotelFactory")
| @Scope(ScopeType.STATELESS)
| public class HotelFactory {
| private static final Logger log = Logger.getLogger(HotelFactory.class);
|
| @Out Hotel hotel;
| @RequestParameter String hotelId;
|
| @In(create=true)
| private Session bookingDatabase;
|
| @In
| private List<Hotel> hotels; // big trouble with the type of this field
| @Out
| private int hotelIndex;
|
| @Factory("hotel")
| public void getHotel() {
| long hotelId = Long.parseLong(this.hotelId);
|
| hotel = (Hotel)bookingDatabase.createQuery("from Hotel where id = ?")
| .setParameter(0, hotelId)
| .uniqueResult();
|
| if (hotels != null) {
| for (int i = 0; i < hotels.size(); i++) {
| Hotel listHotel = (Hotel) hotels.get(i);
| // have to compare id's because "hotel" and "hotels" were
loaded in different
| // persistence sessions (since there's no common context for
them both).
| if (hotel.getId().equals(listHotel.getId())) {
| hotelIndex = i;
| break;
| }
| }
| }
|
| log.info("got hotel for id " + hotelId + ": " + hotel);
| }
| }
As you can see from the comments, this doesn't work. It actually fails to
biject "hotels".
- If I declare "hotels" as "@In private List hotels", it fails, because it
tries to inject a ListDataModel value into HotelFactory.hotels, which (sensibly
enough) gives an IllegalArgumentException at
sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:63).
- If I declare "hotels" as "@In @DataModel private List hotels", it fails for
the same reason -- still trying to inject a ListDataModel into a List.
- If I start flailing wildly and declare "hotels" as "@In @DataModel private
ListDataModel hotels", munging the code around to call .getWrappedData() etc.,
etc., then it actually injects successfully and updates hotelIndex properly.
THEN it dies with:
java.lang.ClassCastException: org.jboss.seam.jsf.ListDataModel
| at org.jboss.seam.Component.outjectDataModel(Component.java:773)
| at org.jboss.seam.Component.outject(Component.java:695)
Line 773 is:
list = (List) getFieldValue( bean, dataModelGetter, name );
Seems like Seam's got me coming and going on this one! :-) Either it won't
inject a List, or it won't outject a ListDataModel!
What gives? The above seems crufty even to me (even if it worked it would be
crufty), so I'm wondering whether there's just a better way to do all this. Is
there an existing sample showing how to use a session-scoped list, RESTful item
links, and next/previous item navigation all together? How's that blog sample
coming? ;-)
Also, as you can see, I have to compare IDs rather than just using
"hotels.indexOf(hotel)" since there doesn't seem to be a shared persistence
context. (In other words, Hibernate session caching not working in this case.)
Is that expected?
I'm also using a CVS snapshot from late January, not Beta2. Would any of this
be different in Beta2?
Thanks again. Worst comes to worst, I'll bail on trying to keep the
session-scoped list in sync.
Cheers,
Rob
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