@Test
public void testOverrun() throws Exception {
BoundMetricFifo fifo = new BoundMetricFifo(10, 2);
SingleMetric metric;
for (int i = 1; i <= 3; i++) {
metric = new SingleMetric("" + i, (long) i, (double) i);
fifo.offer(metric);
}
assert fifo.size() == 2 : "Fifo size should be 2, but was " + fifo.size();
// element "1" should have been pushed out, so 2 and 3 should be there
SingleMetric result = fifo.poll();
assert result != null;
assert result.getTimestamp() == 2 : "Expected ts =2, but it was " + result.getTimestamp();
result = fifo.poll();
assert result != null;
assert result.getTimestamp() == 3 : "Expected ts =3, but it was " + result.getTimestamp();
// we have retrieved all elements
assert fifo.isEmpty();
}
@Test
public void testEmptyFifo() throws Exception {
BoundMetricFifo fifo = new BoundMetricFifo(10, 15);
assert fifo.size() == 0;
assert fifo.isEmpty();
assert fifo.poll() == null;
}
@Test
public void testFifoAddOne() throws Exception {
BoundMetricFifo fifo = new BoundMetricFifo(10, 15);
SingleMetric metric = new SingleMetric("foo", 12345L, 42.0d);
fifo.offer(metric);
assert fifo.size() == 1 : "Size should be 1 but was " + fifo.size();
assert !fifo.isEmpty() : "Fifo should not be empty but it was";
SingleMetric pollResult = fifo.poll();
assert pollResult != null : "Got nothing back from the fifo";
assert pollResult.equals(metric);
}
