java.lang.Object
- org.jgroups.util.UUID

All Implemented Interfaces:

java.lang.Comparable<Address>, Address, Constructable<UUID>, SizeStreamable, Streamable

Direct Known Subclasses:

FlagsUUID
```
public class UUID
extends java.lang.Object
implements Address, Constructable<UUID>
```
Logical address which is unique over space and time.
Copied from java.util.UUID, but unneeded fields from the latter have been removed. UUIDs needs to have a small memory footprint.

Author:

Bela Ban

Field Summary

Fields
Modifier and Type Field Description

protected long leastSigBits

protected long mostSigBits

protected static int SIZE
- Fields inherited from interface org.jgroups.Address
  IP_ADDR, NULL, SITE_MASTER, SITE_UUID, UUID_ADDR

Constructor Summary

Constructors
Modifier	Constructor	Description
	`UUID()`
`protected`	`UUID(byte[] data)`	Private constructor which uses a byte array to construct the new UUID
	`UUID(long mostSigBits, long leastSigBits)`
	`UUID(UUID uuid)`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`compareTo(Address other)`	Compares this UUID with the specified UUID.
`int`	`compareTo(UUID val)`
`UUID`	`copy()`
`java.util.function.Supplier<? extends UUID>`	`create()`	Creates an instance of the class implementing this interface
`protected static java.lang.String`	`digits(long val, int digits)`	Returns val represented by the specified number of hex digits.
`boolean`	`equals(java.lang.Object obj)`	Compares this object to the specified object.
`static UUID`	`fromString(java.lang.String name)`	Creates a `UUID` from the string standard representation as described in the `toString()` method.
`static byte[]`	`generateRandomBytes()`	Generate random bytes and adjusts them for a type-4 UUID
`long`	`getLeastSignificantBits()`
`long`	`getMostSignificantBits()`	Returns the most significant 64 bits of this UUID's 128 bit value.
`int`	`hashCode()`	Returns a hash code for this `UUID`.
`static java.lang.String`	`printName(UUID uuid)`
`static UUID`	`randomUUID()`	Static factory to retrieve a type 4 (pseudo randomly generated) UUID.
`void`	`readFrom(java.io.DataInput in)`	Read the state of the current object (including superclasses) from instream Note that the input stream must not be closed
`int`	`serializedSize()`	Returns the size (in bytes) of the marshalled object
`java.lang.String`	`toString()`
`java.lang.String`	`toStringLong()`	Returns a `String` object representing this `UUID`.
`void`	`writeTo(java.io.DataOutput out)`	Write the entire state of the current object (including superclasses) to outstream.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.jgroups.Address
isMulticast, isSiteAddress, isSiteMaster

- Field Detail
  - mostSigBits
```
protected long mostSigBits
```
  - leastSigBits
```
protected long leastSigBits
```
  - SIZE
```
protected static final int SIZE
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - UUID
```
public UUID()
```
  - UUID
```
public UUID(long mostSigBits,
            long leastSigBits)
```
  - UUID
```
public UUID(UUID uuid)
```
  - UUID
```
protected UUID(byte[] data)
```
    Private constructor which uses a byte array to construct the new UUID
- Method Detail
  - create
```
public java.util.function.Supplier<? extends UUID> create()
```
    Description copied from interface: Constructable
    
    Creates an instance of the class implementing this interface
    
    Specified by:
    
    create in interface Constructable<UUID>
  - randomUUID
```
public static UUID randomUUID()
```
    Static factory to retrieve a type 4 (pseudo randomly generated) UUID. The UUID is generated using a ThreadLocalRandom.
    
    Returns:
    
    A randomly generated UUID
  - getLeastSignificantBits
```
public long getLeastSignificantBits()
```
  - getMostSignificantBits
```
public long getMostSignificantBits()
```
    Returns the most significant 64 bits of this UUID's 128 bit value.
    
    Returns:
    
    The most significant 64 bits of this UUID's 128 bit value
  - printName
```
public static java.lang.String printName(UUID uuid)
```
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object
  - toStringLong
```
public java.lang.String toStringLong()
```
    Returns a String object representing this UUID.
    The UUID string representation is as described by this BNF:
    UUID = <time_low> "-" <time_mid> "-" <time_high_and_version> "-" <variant_and_sequence> "-" <node> time_low = 4*<hexOctet> time_mid = 2*<hexOctet> time_high_and_version = 2*<hexOctet> variant_and_sequence = 2*<hexOctet> node = 6*<hexOctet> hexOctet = <hexDigit><hexDigit> hexDigit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" | "a" | "b" | "c" | "d" | "e" | "f" | "A" | "B" | "C" | "D" | "E" | "F"
    Returns:
    
    A string representation of this UUID
  - fromString
```
public static UUID fromString(java.lang.String name)
```
    Creates a UUID from the string standard representation as described in the toString() method.
    
    Parameters:
    
    name - A string that specifies a UUID
    
    Returns:
    
    A UUID with the specified value
    
    Throws:
    
    java.lang.IllegalArgumentException - If name does not conform to the string representation as described in toString()
  - digits
```
protected static java.lang.String digits(long val,
                                         int digits)
```
    Returns val represented by the specified number of hex digits.
  - hashCode
```
public int hashCode()
```
    Returns a hash code for this UUID.
    
    Overrides:
    
    hashCode in class java.lang.Object
    
    Returns:
    
    A hash code value for this UUID
  - equals
```
public boolean equals(java.lang.Object obj)
```
    Compares this object to the specified object. The result is true if and only if the argument is not null, is a UUID object, and contains the same most- and least significant bits.
    
    Overrides:
    
    equals in class java.lang.Object
    
    Parameters:
    
    obj - The object to be compared
    
    Returns:
    
    true if the objects are the same; false otherwise
  - compareTo
```
public int compareTo(Address other)
```
    Compares this UUID with the specified UUID.
    The first of two UUIDs is greater than the second if the most significant field in which the UUIDs differ is greater for the first UUID.
    
    Specified by:
    
    compareTo in interface java.lang.Comparable<Address>
    
    Parameters:
    
    other - UUID to which this UUID is to be compared
    
    Returns:
    
    -1, 0 or 1 as this UUID is less than, equal to, or greater than val
  - compareTo
```
public int compareTo(UUID val)
```
  - writeTo
```
public void writeTo(java.io.DataOutput out)
             throws java.io.IOException
```
    Description copied from interface: Streamable
    
    Write the entire state of the current object (including superclasses) to outstream. Note that the output stream must not be closed
    
    Specified by:
    
    writeTo in interface Streamable
    
    Throws:
    
    java.io.IOException
  - readFrom
```
public void readFrom(java.io.DataInput in)
              throws java.io.IOException
```
    Description copied from interface: Streamable
    
    Read the state of the current object (including superclasses) from instream Note that the input stream must not be closed
    
    Specified by:
    
    readFrom in interface Streamable
    
    Throws:
    
    java.io.IOException
  - serializedSize
```
public int serializedSize()
```
    Description copied from interface: SizeStreamable
    
    Returns the size (in bytes) of the marshalled object
    
    Specified by:
    
    serializedSize in interface SizeStreamable
  - copy
```
public UUID copy()
```
  - generateRandomBytes
```
public static byte[] generateRandomBytes()
```
    Generate random bytes and adjusts them for a type-4 UUID

Modifier and Type	Field	Description
`protected long`	`leastSigBits`
`protected long`	`mostSigBits`
`protected static int`	`SIZE`

Class UUID

Field Summary

Fields inherited from interface org.jgroups.Address

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface org.jgroups.Address

Field Detail

mostSigBits

leastSigBits

SIZE

Constructor Detail

UUID

UUID

UUID

UUID

Method Detail

create

randomUUID

getLeastSignificantBits

getMostSignificantBits

printName

toString

toStringLong

fromString

digits

hashCode

equals

compareTo

compareTo

writeTo

readFrom

serializedSize

copy

generateRandomBytes