public void setup() {
deadlockDetected = false;
this.getExecutor().swapServerSession();
UnitOfWork uow = getSession().acquireUnitOfWork();
person = (ConcurrentPerson) uow.registerObject(new ConcurrentPerson());
person.name = "SomeoneSpecial";
project = (ConcurrentLargeProject) uow.registerObject(new ConcurrentLargeProject());
project.setName("ConcurrentRFJUOWLock Project");
ConcurrentAddress address = (ConcurrentAddress) uow.registerObject(new ConcurrentAddress());
address.setStreet("99 Bank St");
project.setLocation(address);
uow.commit();
uow.release();
}
public void test() {
Server server = this.getServerSession();
UnitOfWork uow = server.acquireUnitOfWork();
ConcurrentLargeProject clonedProject = (ConcurrentLargeProject) uow.registerObject(project);
clonedProject.getLocation().setPostalCode("K1P 1A4");
ConcurrentPerson clonedPerson = (ConcurrentPerson) uow.registerObject(person);
clonedPerson.setHobby(clonedProject);
uow.writeChanges();
Thread thread1 = new Thread(new ProjectReader(server.acquireClientSession(), project.getId()));
ConcurrentProject.RUNNING_TEST = ConcurrentProject.READ_WITH_UOW_LOCKS_TESTS;
// start reading Project, and have the thread wait while building DTF mappings
thread1.start();
try {
thread1.join(
1000); // wait a token amount to be sure that thread1 isn't starved before getting
// deferred lock on Project.
} catch (InterruptedException ex) {
}
// start uow commit, which will get locks on Person+Address, commit, then merge.
// merge should get a deferred lock on Project.
Thread thread2 = new Thread(new UOWCommit(uow));
thread2.start();
// while waiting, thread1 should wake and try to get a lock on Address. It will deadlock if it
// tries to get an active lock, since they will be held by the UOW which can't complete until
// thread1
// releases.
try {
thread1.join(20000);
if (thread1.isAlive()) {
try {
thread1.interrupt();
thread2.interrupt();
} catch (Exception e) {
}
deadlockDetected = true;
}
} catch (InterruptedException ex) {
}
}
public void reset() {
ConcurrentProject.RUNNING_TEST = ConcurrentProject.NONE;
UnitOfWork uow = getSession().acquireUnitOfWork();
uow.deleteObject(person);
uow.deleteObject(project);
uow.deleteObject(project.getLocation());
uow.commit();
getSession().getIdentityMapAccessor().initializeAllIdentityMaps();
this.getExecutor().resetSession();
}