JarCastingExpiring Cache
Sometimes it is good to have a cache that contains entries that expire. This is a simple implementation of such as cache which has served me well in very, very big applications for several years now.
This component is available in Maven Central.
A usage example (from the tests):
private ExpiringCache<Integer, String> loadOneThousand(final long ttl,
final int maxSize) {
final ExpiringCache<Integer, String> map = new ExpiringCache<Integer, String>(
ttl, maxSize);
for (int idx = 0; idx < ONETHOUSAND; idx++) {
map.put(Integer.valueOf(idx), Integer.toHexString(idx));
}
return map;
}
final Map<Integer, String> map1 = loadOneThousand(Integer.MAX_VALUE);
final String val1 = map1.get(Integer.valueOf(255));
assertEquals("ff", val1);
final Map<Integer, String> map2 = loadOneThousand(1);
Thread.sleep(10);
final String val2 = map2.get(Integer.valueOf(255));
assertNull(val2);
