How to use 'Fake Ticker' with Caffeine?

[brent-holland]

In your discussion of testing here you suggest that we use guava-testing's 'FakeTicker' class. Unfortunately, when I try to use this I get an error of incompatible types. Your Caffeine.ticker method is looking for a caffeine.cache.Ticker and FakeTicker is a google.common.base.Ticker, can you please tell me how I can use a fake ticker with caffeine? I didn't see any sort of constructor / builder / converter method that took a google ticker and transformed to a caffeine ticker but perhaps I've missed something. Really need this as having to use a Thread.sleep in a unit test is a no no :)

Error:
incompatible types: com.google.common.base.Ticker cannot be converted to com.github.benmanes.caffeine.cache.Ticker

[ben-manes]

You missed the method reference to adapt. =)

FakeTicker ticker = new FakeTicker(); // Guava's testlib
Cache<Key, Graph> cache = Caffeine.newBuilder()
    .expireAfterWrite(10, TimeUnit.MINUTES)
    .executor(Runnable::run)
    .ticker(ticker::read)
    .maximumSize(10)
    .build();

[brent-holland]

You're absolutely right I missed the ref to read. Works great now and my UT doesn't take minutes to run. Thanks so much!