Duration

sealed abstract class Duration extends Serializable with Ordered[Duration]

Utility for working with java.util.concurrent.TimeUnit durations.

This class is not meant as a general purpose representation of time, it is optimized for the needs of scala.concurrent.

Basic Usage

Examples:

import scala.concurrent.duration._ val duration = Duration(100, MILLISECONDS) val duration = Duration(100, "millis") duration.toNanos duration < 1.second duration <= Duration.Inf

Invoking inexpressible conversions (like calling toSeconds on an infinite duration) will throw an IllegalArgumentException.

Implicits are also provided for Int, Long and Double. Example usage:

import scala.concurrent.duration._ val duration = 100.millis

The DSL provided by the implicit conversions always allows construction of finite durations, even for infinite Double inputs; use Duration.Inf instead.

Extractors, parsing and arithmetic are also included:

val d = Duration("1.2 µs") val Duration(length, unit) = 5 millis val d2 = d * 2.5 val d3 = d2 + 1.millisecond

Handling of Time Units

Calculations performed on finite durations always retain the more precise unit of either operand, no matter whether a coarser unit would be able to exactly express the same duration. This means that Duration can be used as a lossless container for a (length, unit) pair if it is constructed using the corresponding methods and no arithmetic is performed on it; adding/subtracting durations should in that case be done with care.

Correspondence to Double Semantics

The semantics of arithmetic operations on Duration are two-fold:

- exact addition/subtraction with nanosecond resolution for finite durations, independent of the summands' magnitude - isomorphic to java.lang.Double when it comes to infinite or undefined values

The conversion between Duration and Double is done using Duration.toUnit (with unit NANOSECONDS) and Duration.fromNanos(Double)

Ordering

The default ordering is consistent with the ordering of Double numbers, which means that Undefined is considered greater than all other durations, including Duration.Inf.

Companion
object
Source
Duration.scala
class Object
trait Matchable
class Any

Value members

Abstract methods

def *(factor: Double): Duration

Return this duration multiplied by the scalar factor. When involving non-finite factors the semantics match those of Double.

Throws
IllegalArgumentException

in case of a finite overflow: the range of a finite duration is +-(2^63-1)ns, and no conversion to infinite durations takes place.

Source
Duration.scala
def +(other: Duration): Duration

Return the sum of that duration and this. When involving non-finite summands the semantics match those of Double.

Throws
IllegalArgumentException

in case of a finite overflow: the range of a finite duration is +-(2^63-1)ns, and no conversion to infinite durations takes place.

Source
Duration.scala
def -(other: Duration): Duration

Return the difference of that duration and this. When involving non-finite summands the semantics match those of Double.

Throws
IllegalArgumentException

in case of a finite overflow: the range of a finite duration is +-(2^63-1)ns, and no conversion to infinite durations takes place.

Source
Duration.scala
def /(divisor: Double): Duration

Return this duration divided by the scalar factor. When involving non-finite factors the semantics match those of Double.

Throws
IllegalArgumentException

in case of a finite overflow: the range of a finite duration is +-(2^63-1)ns, and no conversion to infinite durations takes place.

Source
Duration.scala
def /(divisor: Duration): Double

Return the quotient of this and that duration as floating-point number. The semantics are determined by Double as if calculating the quotient of the nanosecond lengths of both factors.

This method returns whether this duration is finite, which is not the same as !isInfinite for Double because this method also returns false for Duration.Undefined.

def length: Long

Obtain the length of this Duration measured in the unit obtained by the unit method.

Throws
IllegalArgumentException

when invoked on a non-finite duration

Source
Duration.scala

Return duration which is equal to this duration but with a coarsest Unit, or self in case it is already the coarsest Unit

Examples:

Duration(60, MINUTES).toCoarsest // Duration(1, HOURS) Duration(1000, MILLISECONDS).toCoarsest // Duration(1, SECONDS) Duration(48, HOURS).toCoarsest // Duration(2, DAYS) Duration(5, SECONDS).toCoarsest // Duration(5, SECONDS)
def toDays: Long

Return the length of this duration measured in whole days, rounding towards zero.

Throws
IllegalArgumentException

when invoked on a non-finite duration

Source
Duration.scala

Return the length of this duration measured in whole hours, rounding towards zero.

Throws
IllegalArgumentException

when invoked on a non-finite duration

Source
Duration.scala

Return the length of this duration measured in whole microseconds, rounding towards zero.

Throws
IllegalArgumentException

when invoked on a non-finite duration

Source
Duration.scala

Return the length of this duration measured in whole milliseconds, rounding towards zero.

Throws
IllegalArgumentException

when invoked on a non-finite duration

Source
Duration.scala

Return the length of this duration measured in whole minutes, rounding towards zero.

Throws
IllegalArgumentException

when invoked on a non-finite duration

Source
Duration.scala

Return the length of this duration measured in whole nanoseconds, rounding towards zero.

Throws
IllegalArgumentException

when invoked on a non-finite duration

Source
Duration.scala

Return the length of this duration measured in whole seconds, rounding towards zero.

Throws
IllegalArgumentException

when invoked on a non-finite duration

Source
Duration.scala
def toUnit(unit: TimeUnit): Double

Return the number of nanoseconds as floating point number, scaled down to the given unit. The result may not precisely represent this duration due to the Double datatype's inherent limitations (mantissa size effectively 53 bits). Non-finite durations are represented as - Duration.Undefined is mapped to Double.NaN - Duration.Inf is mapped to Double.PositiveInfinity - Duration.MinusInf is mapped to Double.NegativeInfinity

Negate this duration. The only two values which are mapped to themselves are Duration.Zero and Duration.Undefined.

Obtain the time unit in which the length of this duration is measured.

Throws
IllegalArgumentException

when invoked on a non-finite duration

Source
Duration.scala

Concrete methods

def div(divisor: Double): Duration

Return this duration divided by the scalar factor. When involving non-finite factors the semantics match those of Double.

Throws
IllegalArgumentException

in case of a finite overflow: the range of a finite duration is +-(2^63-1)ns, and no conversion to infinite durations takes place.

Source
Duration.scala
def div(other: Duration): Double

Return the quotient of this and that duration as floating-point number. The semantics are determined by Double as if calculating the quotient of the nanosecond lengths of both factors.

def gt(other: Duration): Boolean
def gteq(other: Duration): Boolean
def lt(other: Duration): Boolean
def lteq(other: Duration): Boolean
def max(other: Duration): Duration

Return the larger of this and that duration as determined by the natural ordering.

def min(other: Duration): Duration

Return the smaller of this and that duration as determined by the natural ordering.

def minus(other: Duration): Duration

Return the difference of that duration and this. When involving non-finite summands the semantics match those of Double.

Throws
IllegalArgumentException

in case of a finite overflow: the range of a finite duration is +-(2^63-1)ns, and no conversion to infinite durations takes place.

Source
Duration.scala
def mul(factor: Double): Duration

Return this duration multiplied by the scalar factor. When involving non-finite factors the semantics match those of Double.

Throws
IllegalArgumentException

in case of a finite overflow: the range of a finite duration is +-(2^63-1)ns, and no conversion to infinite durations takes place.

Source
Duration.scala
def neg(): Duration

Negate this duration. The only two values which are mapped to themselves are Duration.Zero and Duration.Undefined.

def plus(other: Duration): Duration

Return the sum of that duration and this. When involving non-finite summands the semantics match those of Double.

Throws
IllegalArgumentException

in case of a finite overflow: the range of a finite duration is +-(2^63-1)ns, and no conversion to infinite durations takes place.

Source
Duration.scala
def swap: (T2, T1)
Implicitly added by durationToPair

Swaps the elements of this Tuple.

Returns

a new Tuple where the first element is the second element of this Tuple and the second element is the first element of this Tuple.

Source
Tuple2.scala

Inherited methods

def <(that: Duration): Boolean

Returns true if this is less than that

Inherited from
Ordered
Source
Ordered.scala
def <=(that: Duration): Boolean

Returns true if this is less than or equal to that.

Inherited from
Ordered
Source
Ordered.scala
def >(that: Duration): Boolean

Returns true if this is greater than that.

Inherited from
Ordered
Source
Ordered.scala
def >=(that: Duration): Boolean

Returns true if this is greater than or equal to that.

Inherited from
Ordered
Source
Ordered.scala
def compare(that: Duration): Int

Result of comparing this with operand that.

Implement this method to determine how instances of A will be sorted.

Returns x where:

  • x < 0 when this < that

  • x == 0 when this == that

  • x > 0 when this > that

Inherited from
Ordered
Source
Ordered.scala
def compareTo(that: Duration): Int

Result of comparing this with operand that.

Inherited from
Ordered
Source
Ordered.scala
Implicitly added by durationToPair

An iterator over the names of all the elements of this product.

Inherited from
Product
Source
Product.scala
Implicitly added by durationToPair

An iterator over all the elements of this product.

Returns

in the default implementation, an Iterator[Any]

Inherited from
Product
Source
Product.scala