@Test
public void shouldCreateWithInitialCapacityAndConcurrenyLevel() throws Exception {
ConcurrentReferenceHashMap<Integer, String> map =
new ConcurrentReferenceHashMap<Integer, String>(16, 2);
assertThat(map.getSegmentsSize(), is(2));
assertThat(map.getSegment(0).getSize(), is(8));
assertThat(map.getLoadFactor(), is(0.75f));
}
@Test
public void shouldCreateWithDefaults() throws Exception {
ConcurrentReferenceHashMap<Integer, String> map =
new ConcurrentReferenceHashMap<Integer, String>();
assertThat(map.getSegmentsSize(), is(16));
assertThat(map.getSegment(0).getSize(), is(1));
assertThat(map.getLoadFactor(), is(0.75f));
}
@Test
public void shouldCreateFullyCustom() throws Exception {
ConcurrentReferenceHashMap<Integer, String> map =
new ConcurrentReferenceHashMap<Integer, String>(5, 0.5f, 3);
// concurrencyLevel of 3 ends up as 4 (nearest power of 2)
assertThat(map.getSegmentsSize(), is(4));
// initialCapacity is 5/4 (rounded up, to nearest power of 2)
assertThat(map.getSegment(0).getSize(), is(2));
assertThat(map.getLoadFactor(), is(0.5f));
}