/** drainTo(c, n) empties first min(n, size) elements of queue into c */
public void testDrainToN() {
for (int i = 0; i < SIZE + 2; ++i) {
DelayQueue q = populatedQueue(SIZE);
ArrayList l = new ArrayList();
q.drainTo(l, i);
int k = (i < SIZE) ? i : SIZE;
assertEquals(SIZE - k, q.size());
assertEquals(k, l.size());
}
}
/** drainTo(c) empties queue into another collection c */
public void testDrainTo() {
DelayQueue q = new DelayQueue();
PDelay[] elems = new PDelay[SIZE];
for (int i = 0; i < SIZE; ++i) {
elems[i] = new PDelay(i);
q.add(elems[i]);
}
ArrayList l = new ArrayList();
q.drainTo(l);
assertEquals(0, q.size());
for (int i = 0; i < SIZE; ++i) assertEquals(elems[i], l.get(i));
q.add(elems[0]);
q.add(elems[1]);
assertFalse(q.isEmpty());
assertTrue(q.contains(elems[0]));
assertTrue(q.contains(elems[1]));
l.clear();
q.drainTo(l);
assertEquals(0, q.size());
assertEquals(2, l.size());
for (int i = 0; i < 2; ++i) assertEquals(elems[i], l.get(i));
}
/** drainTo empties queue */
public void testDrainToWithActivePut() throws InterruptedException {
final DelayQueue q = populatedQueue(SIZE);
Thread t =
new Thread(
new CheckedRunnable() {
public void realRun() {
q.put(new PDelay(SIZE + 1));
}
});
t.start();
ArrayList l = new ArrayList();
q.drainTo(l);
assertTrue(l.size() >= SIZE);
t.join();
assertTrue(q.size() + l.size() >= SIZE);
}