Hello,
I'm trying to run three threads that perform long calculations on
data within the object space. Each thread needs to check EO states
set by the other threads at certain intervals to make sure that it
isn't working on the same calculations as other threads. When
checking these states, each thread goes through a common sync point
object of class PoolSync that has syncronized methods.
public class PoolSync {
public synchronized boolean checkAndLock(Pool pool, String
threadName, EOEditingContext ec) {
System.out.println("checkAndLock called by " + threadName + "for pool
" + pool.name());
if (!(pool.calculating())) {
pool.calculating(true);
ec.saveChanges();
System.out.println("setCalculating true " + threadName + " for
pool " + pool.name());
return true;
} else {
System.out.println("checkAndLock returning false " + threadName +
"for pool " + pool.name());
return false;
}
}
}
I've set up each thread with its own editing context, with each having
the same parent ObjectStoreCoordinator using the following code:
EOObjectStoreCoordinator parentObjectStore = new
EOObjectStoreCoordinator();
EOEditingContext thread1EditingContext =
ERXEC.newEditingContext(parentObjectStore);
EOEditingContext thread2EditingContext =
ERXEC.newEditingContext(parentObjectStore);
EOEditingContext thread3EditingContext =
ERXEC.newEditingContext(parentObjectStore);
This is the call thread1 makes:
poolSync.checkAndLockForCanIWins(pool, threadName,
thread1EditingContext)
While the synchronized class seems to work as expected based on my IO
output below, the editing contexts in each thread don't seem to be
being kept up to date with states set from other threads. I was under
the impression that WO would do this for me automatically as soon as
saveChanges was called as long as they shared the same parent
ObjectStoreCoordinator. Is that not the case?
Note that even though thread 1 sets pool.calculating to true for
TESTPOOL, threads 2 and 3 later read the pool.calculating() state as
False.
checkAndLock called by Thread 1for pool TESTPOOL
setCalculating true Thread 1 for pool TESTPOOL
checkAndLock called by Thread 3for pool TESTPOOL
setCalculating true Thread 3 for pool TESTPOOL
checkAndLock called by Thread 2for pool TESTPOOL
setCalculating true Thread 2 for pool TESTPOOL
Thanks!
Jeff
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