io.vertx.rxjava3.ext.auth

Class VertxContextPRNG

java.lang.Object

io.vertx.rxjava3.ext.auth.VertxContextPRNG

public class VertxContextPRNG
extends Object

A secure non blocking random number generator isolated to the current context. The PRNG is bound to the vert.x context and setup to close when the context shuts down.

When applicable, use of VertxContextPRNG rather than create new PRNG objects is helpful to keep the system entropy usage to the minimum avoiding potential blocking across the application.

The use of VertxContextPRNG is particularly appropriate when multiple handlers use random numbers.

NOTE: This class has been automatically generated from the original non RX-ified interface using Vert.x codegen.

Field Summary

Fields

Modifier and Type	Field and Description
static io.vertx.lang.rx.TypeArg<VertxContextPRNG>	__TYPE_ARG

Constructor Summary

Constructors

Constructor and Description
VertxContextPRNG(Object delegate)
VertxContextPRNG(VertxContextPRNG delegate)

Method Summary

Modifier and Type	Method and Description
void	close() stop seeding the PRNG
static VertxContextPRNG	current() Get or create a secure non blocking random number generator using the current vert.x context.
static VertxContextPRNG	current(Vertx vertx) Get or create a secure non blocking random number generator using the current vert.x instance.
boolean	equals(Object o)
VertxContextPRNG	getDelegate()
int	hashCode()
static VertxContextPRNG	newInstance(VertxContextPRNG arg)
boolean	nextBoolean() Returns a secure random boolean
void	nextBytes(byte[] bytes) Fills the given byte array with random bytes.
double	nextDouble() Returns a secure random double value.
float	nextFloat() Returns a secure random float value.
double	nextGaussian() Returns a secure random double value.
int	nextInt() Returns a secure random int
int	nextInt(int bound) Returns a secure random int, between 0 (inclusive) and the specified bound (exclusive).
long	nextLong() Returns a secure random long
String	nextString(int length) Returns a Base64 url encoded String of random data with the given length.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

__TYPE_ARG

public static final io.vertx.lang.rx.TypeArg<VertxContextPRNG> __TYPE_ARG

Constructor Detail

VertxContextPRNG

public VertxContextPRNG(VertxContextPRNG delegate)

VertxContextPRNG

public VertxContextPRNG(Object delegate)

Method Detail

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

getDelegate

public VertxContextPRNG getDelegate()

current

public static VertxContextPRNG current()

Get or create a secure non blocking random number generator using the current vert.x context. If there is no current context (i.e.: not running on the eventloop) then a IllegalStateException is thrown. Note, if a context isn't allowed to be used, for example, exceptions are thrown on getting and putting data, the VertxContextPRNG falls back to instantiate a new instance of the PRNG per call.

Returns:

A secure non blocking random number generator.

current

public static VertxContextPRNG current(Vertx vertx)

Get or create a secure non blocking random number generator using the current vert.x instance. Since the context might be different this method will attempt to use the current context first if available and then fall back to create a new instance of the PRNG. Note, if a context isn't allowed to be used, for example, exceptions are thrown on getting and putting data, the VertxContextPRNG falls back to instantiate a new instance of the PRNG per call.

Parameters:

vertx - a Vert.x instance.

Returns:

A secure non blocking random number generator.

close

public void close()

stop seeding the PRNG

nextString

public String nextString(int length)

Returns a Base64 url encoded String of random data with the given length. The length parameter refers to the length of the String before the encoding step.

Parameters:

length - the desired string length before Base64 encoding.

Returns:

A base 64 encoded string.

nextInt

public int nextInt()

Returns a secure random int

Returns:

random int.

nextInt

public int nextInt(int bound)

Returns a secure random int, between 0 (inclusive) and the specified bound (exclusive).

Parameters:

bound - the upper bound (exclusive), which must be positive.

Returns:

random int.

nextBoolean

public boolean nextBoolean()

Returns a secure random boolean

Returns:

random boolean.

nextLong

public long nextLong()

Returns a secure random long

Returns:

random long.

nextFloat

public float nextFloat()

Returns a secure random float value. The value is uniformly distributed between 0.0 and 1.0

Returns:

random float.

nextDouble

public double nextDouble()

Returns a secure random double value. The value is uniformly distributed between 0.0 and 1.0

Returns:

random double.

nextGaussian

public double nextGaussian()

Returns a secure random double value. The value is Gaussian ("normally") distributed with mean 0.0 and standard deviation 1.0

Returns:

random double.

nextBytes

public void nextBytes(byte[] bytes)

Fills the given byte array with random bytes.

Parameters:

bytes - a byte array.

newInstance

public static VertxContextPRNG newInstance(VertxContextPRNG arg)