Constructors Constructor Description
All Methods Instance Methods Concrete Methods Modifier and Type Method Description
propose()Obtain a timestamp close to "now".
tick(long add, TimeUnit unit)Advance the time returned by future calls to
public void tick(long add, TimeUnit unit)Advance the time returned by future calls to
add- amount of time to add; must be
unit- unit of
public ProposedTimestamp propose()Obtain a timestamp close to "now".
Proposed times are close to "now", but may not yet be certainly in the past. This allows the calling thread to interleave other useful work while waiting for the clock instance to create an assurance it will never in the future propose a time earlier than the returned time.
A hypothetical implementation could read the local system clock (managed by NTP) and return that proposal, concurrently sending network messages to closely collaborating peers in the same cluster to also ensure their system clocks are ahead of this time. In such an implementation the
ProposedTimestamp.blockUntil(Duration)method would wait for replies from the peers indicating their own system clocks have moved past the proposed time.