org.eclipse.jgit.util.time

Class MonotonicSystemClock

java.lang.Object

org.eclipse.jgit.util.time.MonotonicSystemClock

All Implemented Interfaces:

MonotonicClock

public class MonotonicSystemClock
extends Object
implements MonotonicClock

A MonotonicClock based on System.currentTimeMillis.

Since:

4.6

Constructor Summary

Constructors

Constructor and Description
MonotonicSystemClock()

Method Summary

Modifier and Type	Method and Description
ProposedTimestamp	propose() Obtain a timestamp close to "now".

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MonotonicSystemClock

public MonotonicSystemClock()

Method Detail

propose

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.

Specified by:

propose in interface MonotonicClock

Returns:

a ProposedTimestamp object.