@Test
public void testPollBatch() {
try {
ClosableBlockingQueue<String> queue = new ClosableBlockingQueue<>();
assertNull(queue.pollBatch());
queue.add("a");
queue.add("b");
assertEquals(asList("a", "b"), queue.pollBatch());
assertNull(queue.pollBatch());
queue.add("c");
assertEquals(singletonList("c"), queue.pollBatch());
assertNull(queue.pollBatch());
assertTrue(queue.close());
try {
queue.pollBatch();
fail("should cause an exception");
} catch (IllegalStateException ignored) {
// expected
}
} catch (Exception e) {
e.printStackTrace();
fail(e.getMessage());
}
}
private static void testCallExitsOnClose(
final QueueCall call, ClosableBlockingQueue<String> queue) throws Exception {
final AtomicReference<Throwable> errorRef = new AtomicReference<>();
Runnable runnable =
new Runnable() {
@Override
public void run() {
try {
call.call();
} catch (Throwable t) {
errorRef.set(t);
}
}
};
Thread thread = new Thread(runnable);
thread.start();
Thread.sleep(100);
queue.close();
thread.join();
@SuppressWarnings("ThrowableResultOfMethodCallIgnored")
Throwable cause = errorRef.get();
assertTrue(cause instanceof IllegalStateException);
}
@Test
public void testCloseEmptyQueue() {
try {
ClosableBlockingQueue<String> queue = new ClosableBlockingQueue<>();
assertTrue(queue.isOpen());
assertTrue(queue.close());
assertFalse(queue.isOpen());
assertFalse(queue.addIfOpen("element"));
assertTrue(queue.isEmpty());
try {
queue.add("some element");
fail("should cause an exception");
} catch (IllegalStateException ignored) {
// expected
}
} catch (Exception e) {
e.printStackTrace();
fail(e.getMessage());
}
}
@Test
public void testCreateQueueHashCodeEquals() {
try {
ClosableBlockingQueue<String> queue1 = new ClosableBlockingQueue<>();
ClosableBlockingQueue<String> queue2 = new ClosableBlockingQueue<>(22);
assertTrue(queue1.isOpen());
assertTrue(queue2.isOpen());
assertTrue(queue1.isEmpty());
assertTrue(queue2.isEmpty());
assertEquals(0, queue1.size());
assertEquals(0, queue2.size());
assertTrue(queue1.hashCode() == queue2.hashCode());
//noinspection EqualsWithItself
assertTrue(queue1.equals(queue1));
//noinspection EqualsWithItself
assertTrue(queue2.equals(queue2));
assertTrue(queue1.equals(queue2));
assertNotNull(queue1.toString());
assertNotNull(queue2.toString());
List<String> elements = new ArrayList<>();
elements.add("a");
elements.add("b");
elements.add("c");
ClosableBlockingQueue<String> queue3 = new ClosableBlockingQueue<>(elements);
ClosableBlockingQueue<String> queue4 = new ClosableBlockingQueue<>(asList("a", "b", "c"));
assertTrue(queue3.isOpen());
assertTrue(queue4.isOpen());
assertFalse(queue3.isEmpty());
assertFalse(queue4.isEmpty());
assertEquals(3, queue3.size());
assertEquals(3, queue4.size());
assertTrue(queue3.hashCode() == queue4.hashCode());
//noinspection EqualsWithItself
assertTrue(queue3.equals(queue3));
//noinspection EqualsWithItself
assertTrue(queue4.equals(queue4));
assertTrue(queue3.equals(queue4));
assertNotNull(queue3.toString());
assertNotNull(queue4.toString());
} catch (Exception e) {
e.printStackTrace();
fail(e.getMessage());
}
}
@Test
public void testGetBatchBlocking() {
try {
ClosableBlockingQueue<String> queue = new ClosableBlockingQueue<>();
assertEquals(emptyList(), queue.getBatchBlocking(1));
assertEquals(emptyList(), queue.getBatchBlocking(3));
assertEquals(emptyList(), queue.getBatchBlocking(2));
queue.add("a");
queue.add("b");
assertEquals(asList("a", "b"), queue.getBatchBlocking(900000009));
queue.add("c");
queue.add("d");
assertEquals(asList("c", "d"), queue.getBatchBlocking());
assertEquals(emptyList(), queue.getBatchBlocking(2));
queue.add("e");
assertEquals(singletonList("e"), queue.getBatchBlocking(0));
queue.add("f");
assertEquals(singletonList("f"), queue.getBatchBlocking(1000000000));
assertEquals(0, queue.size());
assertEquals(emptyList(), queue.getBatchBlocking(1));
assertEquals(emptyList(), queue.getBatchBlocking(3));
assertEquals(emptyList(), queue.getBatchBlocking(2));
assertTrue(queue.close());
try {
queue.getBatchBlocking();
fail("should cause an exception");
} catch (IllegalStateException ignored) {
// expected
}
try {
queue.getBatchBlocking(1000000000L);
fail("should cause an exception");
} catch (IllegalStateException ignored) {
// expected
}
} catch (Exception e) {
e.printStackTrace();
fail(e.getMessage());
}
}
@Test
public void testGetElementBlocking() {
try {
ClosableBlockingQueue<String> queue = new ClosableBlockingQueue<>();
assertNull(queue.getElementBlocking(1));
assertNull(queue.getElementBlocking(3));
assertNull(queue.getElementBlocking(2));
assertEquals(0, queue.size());
queue.add("a");
queue.add("b");
queue.add("c");
queue.add("d");
queue.add("e");
queue.add("f");
assertEquals(6, queue.size());
assertEquals("a", queue.getElementBlocking(99));
assertEquals("b", queue.getElementBlocking());
assertEquals(4, queue.size());
assertEquals("c", queue.getElementBlocking(0));
assertEquals("d", queue.getElementBlocking(1000000));
assertEquals("e", queue.getElementBlocking());
assertEquals("f", queue.getElementBlocking(1786598));
assertEquals(0, queue.size());
assertNull(queue.getElementBlocking(1));
assertNull(queue.getElementBlocking(3));
assertNull(queue.getElementBlocking(2));
assertTrue(queue.close());
try {
queue.getElementBlocking();
fail("should cause an exception");
} catch (IllegalStateException ignored) {
// expected
}
try {
queue.getElementBlocking(1000000000L);
fail("should cause an exception");
} catch (IllegalStateException ignored) {
// expected
}
} catch (Exception e) {
e.printStackTrace();
fail(e.getMessage());
}
}
@Test
public void testPeekAndPoll() {
try {
ClosableBlockingQueue<String> queue = new ClosableBlockingQueue<>();
assertNull(queue.peek());
assertNull(queue.peek());
assertNull(queue.poll());
assertNull(queue.poll());
assertEquals(0, queue.size());
queue.add("a");
queue.add("b");
queue.add("c");
assertEquals(3, queue.size());
assertEquals("a", queue.peek());
assertEquals("a", queue.peek());
assertEquals("a", queue.peek());
assertEquals(3, queue.size());
assertEquals("a", queue.poll());
assertEquals("b", queue.poll());
assertEquals(1, queue.size());
assertEquals("c", queue.peek());
assertEquals("c", queue.peek());
assertEquals("c", queue.poll());
assertEquals(0, queue.size());
assertNull(queue.poll());
assertNull(queue.peek());
assertNull(queue.peek());
assertTrue(queue.close());
try {
queue.peek();
fail("should cause an exception");
} catch (IllegalStateException ignored) {
// expected
}
try {
queue.poll();
fail("should cause an exception");
} catch (IllegalStateException ignored) {
// expected
}
} catch (Exception e) {
e.printStackTrace();
fail(e.getMessage());
}
}
@Test
public void testCloseNonEmptyQueue() {
try {
ClosableBlockingQueue<Integer> queue = new ClosableBlockingQueue<>(asList(1, 2, 3));
assertTrue(queue.isOpen());
assertFalse(queue.close());
assertFalse(queue.close());
queue.poll();
assertFalse(queue.close());
assertFalse(queue.close());
queue.pollBatch();
assertTrue(queue.close());
assertFalse(queue.isOpen());
assertFalse(queue.addIfOpen(42));
assertTrue(queue.isEmpty());
try {
queue.add(99);
fail("should cause an exception");
} catch (IllegalStateException ignored) {
// expected
}
} catch (Exception e) {
e.printStackTrace();
fail(e.getMessage());
}
}