nl_tokens: Returns a Maybe that emits { @code 0L } after a specified delay on a specified Scheduler . <p > <img width = 640 height = 200 src = https : // raw . github . com / wiki / ReactiveX / RxJava / images / rx - operators / timer . s . png alt = > <dl > <dt > <b > Scheduler : < / b > < / dt > <dd > You specify which { @link Scheduler } this operator will use . < / dd > < / dl >
pl_tokens: @ CheckReturnValue @ NonNull @ SchedulerSupport ( SchedulerSupport . CUSTOM ) public static Maybe < Long > timer ( long delay , TimeUnit unit , Scheduler scheduler ) { ObjectHelper . requireNonNull ( unit , "unit is null" ) ; ObjectHelper . requireNonNull ( scheduler , "scheduler is null" ) ; return RxJavaPlugins . onAssembly ( new MaybeTimer ( Math . <mask> ( 0L , delay ) , unit , scheduler ) ) ; }