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package cgeo.geocaching.utils;
import static org.assertj.core.api.Assertions.assertThat;
import cgeo.geocaching.Geocache;
import java.util.Map;
public class LeastRecentlyUsedMapTest extends AbstractLRUTest {
public static void testLruMode() {
final Map<String, String> map = new LeastRecentlyUsedMap.LruCache<String, String>(4);
map.put("one", "1");
map.put("two", "2");
map.put("three", "3");
// keep in cache
map.get("one");
map.put("four", "4");
map.put("five", "5");
map.put("six", "6");
// keep in cache
map.get("one");
// re-add
map.put("five", "5");
map.put("seven", "7");
assertEquals("six, one, five, seven", colToStr(map.keySet()));
}
public static void testBoundedMode() {
final Map<String, String> map = new LeastRecentlyUsedMap.Bounded<String, String>(5);
map.put("one", "1");
map.put("two", "2");
map.put("three", "3");
// read does not change anything
map.get("one");
map.put("four", "4");
// re-put should update the order
map.put("three", "3");
map.put("five", "5");
// read does not change anything
map.get("one");
map.put("six", "6");
map.put("seven", "7");
assertEquals("four, three, five, six, seven", colToStr(map.keySet()));
}
public static void testRemoveEldestEntry() {
final LeastRecentlyUsedMap<String, Geocache> cache = new LeastRecentlyUsedMap.LruCache<String, Geocache>(10);
final Geocache first = new Geocache();
assertThat(cache.put("1", first)).isNull();
final Geocache second = new Geocache();
assertThat(cache.put("2", second)).isNull();
assertThat(cache).hasSize(2);
assertThat(cache.containsKey("1")).isTrue();
assertThat(cache.containsValue(first)).isTrue();
assertThat(cache.containsKey("2")).isTrue();
assertThat(cache.containsValue(second)).isTrue();
for (int i = 3; i <= 10; i++) {
assertThat(cache.put(Integer.toString(i), new Geocache())).isNull();
}
assertThat(cache).hasSize(10);
assertThat(cache.containsKey("1")).isTrue();
assertThat(cache.containsValue(first)).isTrue();
assertThat(cache.containsKey("2")).isTrue();
assertThat(cache.containsValue(second)).isTrue();
assertThat(cache.remove("1")).isNotNull(); // just replacing the old entry would not work
assertThat(cache.put("1", new Geocache())).isNull();
assertThat(cache.put("11", new Geocache())).isNull();
assertThat(cache).hasSize(10);
// first has been overwritten by new value, but key must be in, because it is very new
assertThat(cache.containsKey("1")).isTrue();
// second has been overwritten by 11
assertThat(cache.containsKey("2")).isFalse();
assertThat(cache.containsKey("11")).isTrue();
}
}
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