@Test
public void testRefreshAbsentElement() throws Exception {
final IncrementingCacheEntryFactory factory = new IncrementingCacheEntryFactory();
selfPopulatingCache = new SelfPopulatingCache(cache, factory);
selfPopulatingCache.get("key1");
selfPopulatingCache.get("key2");
assertEquals(2, selfPopulatingCache.getSize());
assertEquals(2, factory.getCount());
// full refresh
selfPopulatingCache.refresh();
assertEquals(2, selfPopulatingCache.getSize());
assertEquals(4, factory.getCount());
// single element refresh which is not in the cache
Element e3 = selfPopulatingCache.refresh("key3");
assertEquals(3, selfPopulatingCache.getSize());
assertEquals(5, factory.getCount());
assertNotNull(e3);
assertEquals("key3", e3.getKey());
assertEquals(Integer.valueOf(5), e3.getValue());
}
@Test
public void testRefreshElement() throws Exception {
final IncrementingCacheEntryFactory factory = new IncrementingCacheEntryFactory();
selfPopulatingCache = new SelfPopulatingCache(cache, factory);
Element e1 = selfPopulatingCache.get("key1");
Element e2 = selfPopulatingCache.get("key2");
assertEquals(2, selfPopulatingCache.getSize());
assertEquals(2, factory.getCount());
assertEquals(Integer.valueOf(1), e1.getValue());
assertEquals(Integer.valueOf(2), e2.getValue());
// full refresh
selfPopulatingCache.refresh();
e1 = selfPopulatingCache.get("key1");
e2 = selfPopulatingCache.get("key2");
assertEquals(2, selfPopulatingCache.getSize());
assertEquals(4, factory.getCount());
// we cannot be sure which order key1 or key2 gets refreshed,
// as the implementation makes no guarantee over the sequence
// of the refresh; all we can be sure of is that between
// them key1&2 must have the values 3 & 4
int e1i = ((Integer) e1.getValue()).intValue();
int e2i = ((Integer) e2.getValue()).intValue();
assertTrue(((e1i == 3) && (e2i == 4)) || ((e1i == 4) && (e2i == 3)));
// single element refresh
selfPopulatingCache.get("key2");
Element e2r = selfPopulatingCache.refresh("key2");
assertEquals(2, selfPopulatingCache.getSize());
assertEquals(5, factory.getCount());
assertNotNull(e2r);
assertEquals("key2", e2r.getKey());
assertEquals(Integer.valueOf(5), e2r.getValue());
// additional element
Element e3 = selfPopulatingCache.get("key3");
assertEquals(3, selfPopulatingCache.getSize());
assertEquals(6, factory.getCount());
assertNotNull(e3);
assertEquals("key3", e3.getKey());
assertEquals(Integer.valueOf(6), e3.getValue());
// full refresh
selfPopulatingCache.refresh();
assertEquals(3, selfPopulatingCache.getSize());
assertEquals(9, factory.getCount());
}
