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Merge branch 'HEXA-672' of https://github.com/tomekl007/tutorials into tomekl007-HEXA-672

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Predrag Maric 2017-02-08 02:52:37 +01:00
commit ec19a20ee0
1 changed files with 24 additions and 0 deletions
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core-java/src/test/java/com/baeldung/weakhashmap/WeakHashMapTest.java
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@ -29,6 +29,30 @@ public class WeakHashMapTest {
await().atMost(10, TimeUnit.SECONDS).until(map::isEmpty);
}
@Test
public void givenWeakHashMap_whenCacheValueThatHasNoReferenceToIt_GCShouldReclaimThatObjectButLeaveReferencedObject() {
//given
WeakHashMap<UniqueImageName, BigImage> map = new WeakHashMap<>();
BigImage bigImageFirst = new BigImage("foo");
UniqueImageName imageNameFirst = new UniqueImageName("name_of_big_image");
BigImage bigImageSecond = new BigImage("foo_2");
UniqueImageName imageNameSecond = new UniqueImageName("name_of_big_image_2");
map.put(imageNameFirst, bigImageFirst);
map.put(imageNameSecond, bigImageSecond);
assertTrue(map.containsKey(imageNameFirst));
assertTrue(map.containsKey(imageNameSecond));
//when
imageNameFirst = null;
System.gc();
//then
await().atMost(10, TimeUnit.SECONDS).until(() -> map.size() == 1);
await().atMost(10, TimeUnit.SECONDS).until(() -> map.containsKey(imageNameSecond));
}
class BigImage {
public final String imageId;