/guava/android/guava/src/com/google/common/cache/CacheBuilder.java
this.ticker = checkNotNull( NULL_TICKER) ;
this.ticker = checkNotNull ( ticker ) ;
long getRefreshNanos() { return (refreshNanos == UNSET_INT) ? DEFAULT_REFRESH_NANOS : refreshNanos; } @CanIgnoreReturnValue public CacheBuilder<K, V> ticker(Ticker ticker) { checkState(this.ticker == null); <extra_id_0> return this; } Ticker getTicker(boolean recordsTime) { if (ticker != null) { return ticker; }