@Test
public void testWithNullAsKeyAndValue() throws Exception {
final T cache = getInstance(1000, 1000);
assertEquals(0, (long) cache.size());
assertFalse(cache.contains(null));
assertNull(cache.get(null));
// Add entry with null as key and value ...
cache.put(null, null);
assertEquals(1, (long) cache.size());
assertTrue(cache.contains(null));
assertNull(cache.get(null));
// Add another entry ...
cache.put(new Object(), new Object());
assertEquals(2, (long) cache.size());
// Remove entry with null as key ...
assertNull(cache.remove(null).getValue());
assertEquals(1, (long) cache.size());
assertFalse(cache.contains(null));
assertNull(cache.get(null));
// Try to remove entry with null as key again ...
assertNull(cache.remove(null));
assertEquals(1, (long) cache.size());
assertFalse(cache.contains(null));
assertNull(cache.get(null));
}
@Test
public void testShouldNotGrowLargerThanMaxSize() throws Exception {
final long maxCacheSize = 1000;
final T cache = getInstance(Integer.MAX_VALUE, (int) maxCacheSize);
final List<ParallelTestRunner.Worker> workers = new ArrayList<>();
final int numThreads = 50;
final int numRoundsPerThread = 50000;
final int minKey = 10000;
final int maxKey = 99999;
for (int i = 0; i < numThreads; ++i) {
final Random random = new Random(i);
workers.add(
new ParallelTestRunner.Worker() {
@Override
public void run() throws Exception {
for (int i = 0; i < numRoundsPerThread; ++i) {
final int key = random.nextInt(maxKey - minKey) + minKey;
cache.put(key, Integer.toBinaryString(key));
}
}
});
}
final ParallelTestRunner parallelTestRunner = new ParallelTestRunner(workers);
parallelTestRunner.run();
assertThat(cache.size(), isLessThanOrEqualTo(maxCacheSize));
}
@Test
public void testWithMaxSize1() {
final T cache = getInstance(1000, 1);
final Object o1 = new Object();
cache.put(o1, o1);
final Object o2 = new Object();
cache.put(o2, o2);
assertEquals(1, (long) cache.size());
assertFalse(cache.contains(o1));
assertTrue(cache.contains(o2));
}
@Test
public void testWithNullAsValue() throws Exception {
final T cache = getInstance(1000, 1000);
final Object o = new Object();
assertEquals(0, (long) cache.size());
assertFalse(cache.contains(o));
assertNull(cache.get(o));
// Add entry with null as value ...
cache.put(o, null);
assertEquals(1, (long) cache.size());
assertTrue(cache.contains(o));
assertNull(cache.get(o));
// Remove entry with null as value ...
assertNull(cache.remove(o).getValue());
assertEquals(0, (long) cache.size());
assertFalse(cache.contains(o));
assertNull(cache.get(o));
// Try to remove entry with null as value again ...
assertNull(cache.remove(o));
assertEquals(0, (long) cache.size());
assertFalse(cache.contains(o));
assertNull(cache.get(o));
}
