org.apache.cassandra.utils

Interface MonotonicClock

All Known Implementing Classes:

MonotonicClock.AbstractEpochSamplingClock, MonotonicClock.SampledClock, MonotonicClock.SystemClock

public interface MonotonicClock

Wrapper around time related functions that are either implemented by using the default JVM calls or by using a custom implementation for testing purposes. See preciseTime for how to use a custom implementation. Please note that Clock wasn't used, as it would not be possible to provide an implementation for now() with the exact same properties of System.nanoTime().

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	MonotonicClock.AbstractEpochSamplingClock
static class	MonotonicClock.Defaults
static class	MonotonicClock.SampledClock
static class	MonotonicClock.SystemClock

Field Summary

Fields

Modifier and Type	Field and Description
static MonotonicClock	approxTime
static MonotonicClock	preciseTime Static singleton object that will be instantiated by default with a system clock implementation.

Method Summary

Modifier and Type	Method and Description
long	error()
boolean	isAfter(long instant)
boolean	isAfter(long now, long instant)
long	now()
MonotonicClockTranslation	translate()

Field Detail

preciseTime

static final MonotonicClock preciseTime

Static singleton object that will be instantiated by default with a system clock implementation. Set cassandra.clock system property to a FQCN to use a different implementation instead.

approxTime

static final MonotonicClock approxTime

Method Detail

now

long now()

See Also:

Provides a monotonic time that can be compared with any other such value produced by the same clock since the application started only; these times cannot be persisted or serialized to other nodes. Nanosecond precision.

error

long error()

Returns:

nanoseconds of potential error

translate

MonotonicClockTranslation translate()

isAfter

boolean isAfter(long instant)

isAfter

boolean isAfter(long now,
                long instant)