@Test
public void testClear() {
final ARingBuffer<Long> rb = new ARingBuffer<Long>(Long.class, 100);
assertFalse(rb.iterator().hasNext());
rb.clear();
assertFalse(rb.iterator().hasNext());
rb.put(1L);
assertTrue(rb.iterator().hasNext());
rb.clear();
assertFalse(rb.iterator().hasNext());
for (long i = 0; i < 12345; i++) {
rb.put(i);
}
assertTrue(rb.iterator().hasNext());
rb.clear();
assertFalse(rb.iterator().hasNext());
}
@Test
public void testOneWriterManyReaders() {
final int BUF_SIZE = 100;
final AtomicBoolean finished = new AtomicBoolean(false);
final AtomicBoolean failed = new AtomicBoolean(false);
final ARingBuffer<Long> rb = new ARingBuffer<Long>(Long.class, BUF_SIZE);
for (int i = 0; i < 10; i++) {
new Thread() {
@Override
public void run() {
while (!finished.get()) {
long prev = -1;
for (long val : rb) {
try {
if (prev != -1) {
assertEquals(prev + 1, val);
}
} catch (AssertionError e) {
failed.set(true);
throw e;
} catch (RuntimeException e) {
failed.set(true);
throw e;
}
prev = val;
}
}
}
}.start();
}
for (long i = 1; i < 10 * 1000 * 1000; i++) {
rb.put(i);
}
finished.set(true);
assertFalse(failed.get());
}
@Test
public void testSingleThreaded() {
final ARingBuffer<Long> rb = new ARingBuffer<Long>(Long.class, 100);
assertFalse(rb.iterator().hasNext());
try {
rb.iterator().next();
fail("exception expected");
} catch (Exception exc) {
}
for (long i = 1; i < 2000; i++) {
rb.put(i);
final Iterator<Long> iter = rb.iterator();
for (long j = Math.max(1, i - 99); j <= i; j++) {
assertTrue(iter.hasNext());
assertEquals(Long.valueOf(j), iter.next());
}
assertFalse(iter.hasNext());
}
}