Looked at it and thought, then remembered this from the
NSNotificationCenter docs:
Note: If the default NSNotificationCenter is the last object in your
application with a reference to either an object registered to receive
notifications or an object being observed, that object will be garbage
collected.
So, since I was just making the observers in the addObserver call,
they didn't have a reference anywhere other than by the
defaultCenter . . . so it was garbage collected. By simply making a
reference in the method, then everything worked appropriately.
Wow, so don't go and make some omniscient observer and just cast it
off into space to do its thing without some kind of persistent
reference.
On Sep 4, 2009, at 10:13 AM, John Larson wrote:
Hi All,
I am putting some unit tests together and am running upon an oddity
that I don't understand (and trying to tell myself that WebObjects
isn't being end-of-lifed because everything is "legacy"
documentation - I'm freaking out!). Anyways, if I do this:
public class PurchasingTest extends XTest {
public class ECLogger{
public void logECMsg(NSNotification n){
Logger.getLogger(this.getClass()).debug("EC sent " +
n.name());
}
}
@Test
public void simpleECChangeTest(){
EOEditingContext ec = ERXEC.newEditingContext();
ec.lock();
NSNotificationCenter.defaultCenter().addObserver(new ECLogger(),
new NSSelector("logECMsg", new
Class[]{NSNotification.class}),
null,
ec);
User user = Utils.newEntityForClass(ec, User.class);
ec.saveChanges();
// NSNotificationCenter.defaultCenter().addObserver(new ECLogger(),
// new NSSelector("logECMsg", new
Class[]{NSNotification.class}),
// null,
// ec);
user.setNickname("friend");
ec.saveChanges();
ec.unlock();
}
}
I get nothing in the log. If I switch the comments to add the
observer at the latter spot, then I get this in the console, which
looks okay to me:
7170 [main] DEBUG tests.PurchasingTest$ECLogger - EC sent
EOEditingContextWillSaveChanges
7171 [main] DEBUG tests.PurchasingTest$ECLogger - EC sent
EOObjectsChangedInStoreNotification
7171 [main] DEBUG tests.PurchasingTest$ECLogger - EC sent
EOObjectsChangedInEditingContextNotification
7171 [main] DEBUG tests.PurchasingTest$ECLogger - EC sent
ObjectsWillChangeInEditingContext
7181 [main] DEBUG tests.PurchasingTest$ECLogger - EC sent
EOEditingContextDidSaveChangesNotification
7183 [main] DEBUG tests.PurchasingTest$ECLogger - EC sent
EOObjectsChangedInStoreNotification
7183 [main] DEBUG tests.PurchasingTest$ECLogger - EC sent
EOObjectsChangedInEditingContextNotification
I don't get it. Any ideas? I thought maybe it had something to do
with the save, but the fact is that I am running the exact same
routine with the same EO data and everything. The only thing that
is different is where I add the observer. I am on 5.3 still and
using Wonder for 5.3.
Thanks in advance,
John
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