/**
* Make sure that when the listener graph changes during an event, it gets processed only at the
* conclusion of that event.
*/
public void testRemovesAndAddsDuringEvent() {
SequenceDependenciesEventPublisher publisher = new SequenceDependenciesEventPublisher();
SimpleSubjectListener a = new SimpleSubjectListener("A", publisher);
SimpleSubjectListener b = new SimpleSubjectListener("B", publisher);
SimpleSubjectListener c = new SimpleSubjectListener("C", publisher);
SimpleSubjectListener d = new SimpleSubjectListener("D", publisher);
a.addListener(b);
// add c as a listener to b, it shouldn't receive the first event
b.setRunOnceRunnable(new AddListenerRunnable(b, c));
a.setValue("Saskatchwan");
assertEquals(1, b.getReceivedEvents().size());
assertEquals(0, c.getReceivedEvents().size());
a.setValue("Tiger-Cats");
assertEquals(2, b.getReceivedEvents().size());
assertEquals(1, c.getReceivedEvents().size());
// remove c as a listener to b, it should still receive the event
b.setRunOnceRunnable(new RemoveListenerRunnable(b, c));
a.setValue("Blue Bombers");
assertEquals(3, b.getReceivedEvents().size());
assertEquals(2, c.getReceivedEvents().size());
a.setValue("Stampeders");
assertEquals(4, b.getReceivedEvents().size());
assertEquals(2, c.getReceivedEvents().size());
// add a completely unrelated listener b to do events for c and d
a.addListener(c);
b.setRunOnceRunnable(new AddListenerRunnable(c, d));
a.setValue("Argonauts");
assertEquals(3, c.getReceivedEvents().size());
assertEquals(0, d.getReceivedEvents().size());
a.setValue("Lions");
assertEquals(4, c.getReceivedEvents().size());
assertEquals(1, d.getReceivedEvents().size());
// remove the unrelated listener b to do events for c and d
b.setRunOnceRunnable(new RemoveListenerRunnable(c, d));
a.setValue("Eskimos");
assertEquals(5, c.getReceivedEvents().size());
assertEquals(2, d.getReceivedEvents().size());
a.setValue("Alouettes");
assertEquals(6, c.getReceivedEvents().size());
assertEquals(2, d.getReceivedEvents().size());
}
