Caffeine has expiresAfterWrite method which looks at last write time. I want it to look only at the creation time. So when the first entry comes then entry will be expired after a fixed amount of time without looking at the number of updates on this entry. Is this possible?
Yes, but requires using the more advanced Expiry api. In the below example, a newly created entry has a fixed 5 minute lifetime. This is done by returning currentDuration on an update or read.
LoadingCache<Key, Graph> graphs = Caffeine.newBuilder()
.expireAfter(new Expiry<Key, Graph>() {
public long expireAfterCreate(Key key, Graph graph, long currentTime) {
return TimeUnit.MINUTES.toNanos(5);
}
public long expireAfterUpdate(Key key, Graph graph,
long currentTime, long currentDuration) {
return currentDuration;
}
public long expireAfterRead(Key key, Graph graph,
long currentTime, long currentDuration) {
return currentDuration;
}
})
.build(key -> createExpensiveGraph(key));