~~Cancel~~

~~Ack~~

Cancelable

execution

CancelableFuture

execution

CompositeCancelable

cancelables

Continue

Ack

cancel

Cancelable CompositeCancelable MultiAssignmentCancelable RefCountCancelable SerialCancelable SingleAssignmentCancelable StackedCancelable SingleAssignmentSubscription

cancelTask

State

cancelables

execution

clock

State

collect

CancelableFuture

currentTimeMillis

Scheduler TestScheduler