/** Make sure that all events get fired to all listeners. */
public void testVeryBasicChain() {
SequenceDependenciesEventPublisher publisher = new SequenceDependenciesEventPublisher();
SimpleSubjectListener a = new SimpleSubjectListener("A", publisher);
SimpleSubjectListener b = new SimpleSubjectListener("B", publisher);
SimpleSubjectListener c = new SimpleSubjectListener("C", publisher);
a.setValue("apple");
assertEquals("apple", a.getValue());
assertEquals(null, b.getValue());
assertEquals(null, c.getValue());
a.addListener(b);
a.setValue("banana");
assertEquals("banana", a.getValue());
assertEquals("[A:banana]", b.getValue());
assertEquals(null, c.getValue());
a.addListener(c);
a.setValue("chocolate");
assertEquals("chocolate", a.getValue());
assertEquals("[A:chocolate]", b.getValue());
assertEquals("[A:chocolate]", c.getValue());
a.removeListener(b);
a.setValue("ducks");
assertEquals("ducks", a.getValue());
assertEquals("[A:chocolate]", b.getValue());
assertEquals("[A:ducks]", c.getValue());
c.addListener(b);
a.setValue("elephants");
assertEquals("elephants", a.getValue());
assertEquals("[C:[A:elephants]]", b.getValue());
assertEquals("[A:elephants]", c.getValue());
c.setValue("foxes");
assertEquals("elephants", a.getValue());
assertEquals("[C:foxes]", b.getValue());
assertEquals("foxes", c.getValue());
a.removeListener(c);
a.setValue("gorillas");
assertEquals("gorillas", a.getValue());
assertEquals("[C:foxes]", b.getValue());
assertEquals("foxes", c.getValue());
a.addListener(c);
a.setValue("horses");
assertEquals("horses", a.getValue());
assertEquals("[C:[A:horses]]", b.getValue());
assertEquals("[A:horses]", c.getValue());
}
/**
* 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());
}
/** Make sure we throw an exception when attempting to remove something that's not a listener. */
public void testUnknownRemoveThrowsException() {
SequenceDependenciesEventPublisher publisher = new SequenceDependenciesEventPublisher();
SimpleSubjectListener a = new SimpleSubjectListener("A", publisher);
SimpleSubjectListener b = new SimpleSubjectListener("B", publisher);
SimpleSubjectListener c = new SimpleSubjectListener("C", publisher);
// add a listener
a.addListener(b);
try {
a.removeListener(c);
fail("No exception thrown when removing a non-existent listener");
} catch (IllegalArgumentException e) {
// expected
}
// remove the other listener, this shouldn't throw
a.removeListener(b);
}
public void run() {
subject.addListener(listener);
}