ACE_Utils::UUID_Generator Class Reference

#include <UUID.h>

Collaboration diagram for ACE_Utils::UUID_Generator:

List of all members.

Classes
struct	UUID_State
Public Types
enum	{ ACE_UUID_CLOCK_SEQ_MASK = 0x3FFF }
typedef ACE_UINT64	UUID_Time
Public Member Functions
	UUID_Generator (void)
	Default constructor.
	~UUID_Generator ()
	Destructor.
void	init (void)
void	generate_UUID (UUID &, ACE_UINT16 version=0x0001, u_char variant=0x80)
UUID *	generate_UUID (ACE_UINT16 version=0x0001, u_char variant=0x80)
ACE_SYNCH_MUTEX *	lock (void)
void	lock (ACE_SYNCH_MUTEX *lock, bool release_lock)
	Set a new locking strategy and return the old one.
Private Member Functions
void	get_timestamp (UUID_Time &timestamp)
void	get_timestamp_and_clocksequence (UUID_Time &timestamp, ACE_UINT16 &clockSequence)
void	get_systemtime (UUID_Time &timeNow)
Private Attributes
UUID_Time	time_last_
	The system time when that last uuid was generated.
UUID_State	uuid_state_
	The UUID generator persistent state.
ACE_SYNCH_MUTEX *	lock_
bool	destroy_lock_
bool	is_init_
	Initalization state of the generator.

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Member Typedef Documentation

typedef ACE_UINT64 ACE_Utils::UUID_Generator::UUID_Time

Type to represent UTC as a count of 100 nanosecond intervals since 00:00:00.00, 15 October 1582.

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Member Enumeration Documentation

anonymous enum

Enumerator:

ACE_UUID_CLOCK_SEQ_MASK

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Constructor & Destructor Documentation

ACE_Utils::UUID_Generator::UUID_Generator

(

void

)

Default constructor.

ACE_Utils::UUID_Generator::~UUID_Generator

(

void

)

Destructor.

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Member Function Documentation

void ACE_Utils::UUID_Generator::generate_UUID	(	UUID &	uuid,
		ACE_UINT16	version = 0x0001,
		u_char	variant = 0x80
	)

Format timestamp, clockseq, and nodeID into an UUID of the specified version and variant. For generating UUID's with thread and process ids use variant=0xc0

UUID * ACE_Utils::UUID_Generator::generate_UUID	(	ACE_UINT16	version = 0x0001,
		u_char	variant = 0x80
	)

Format timestamp, clockseq, and nodeID into a VI UUID. For generating UUID's with thread and process ids use variant=0xc0

void ACE_Utils::UUID_Generator::get_systemtime

(

UUID_Time &

timestamp

)

[private]

Obtain the system time in UTC as a count of 100 nanosecond intervals since 00:00:00.00, 15 October 1582 (the date of Gregorian reform to the Christian calendar).

ACE_Time_Value is in POSIX time, seconds since Jan 1, 1970. UUIDs use time in 100ns ticks since 15 October 1582. The difference is: 15 Oct 1582 - 1 Jan 1600: 17 days in Oct, 30 in Nov, 31 in Dec + 17 years and 4 leap days (1584, 88, 92 and 96) 1 Jan 1600 - 1 Jan 1900: 3 centuries + 73 leap days ( 25 in 17th cent. and 24 each in 18th and 19th centuries) 1 Jan 1900 - 1 Jan 1970: 70 years + 17 leap days. This adds up, in days: (17+30+31+365*17+4)+ (365*300+73)+ (365*70+17) or 122192928000000000U (0x1B21DD213814000) 100 ns ticks.

Get the time of day, convert to 100ns ticks then add the offset.

void ACE_Utils::UUID_Generator::get_timestamp

(

UUID_Time &

timestamp

)

[private]

Obtain a UUID timestamp. Compensate for the fact that the time obtained from getSystem time has a resolution less than 100ns.

Obtain a new timestamp. If UUID's are being generated too quickly the clock sequence will be incremented

void ACE_Utils::UUID_Generator::get_timestamp_and_clocksequence	(	UUID_Time &	timestamp,
		ACE_UINT16 &	clockSequence
	)		[private]

Obtain a UUID timestamp and clock sequence. Compensate for the fact that the time obtained from getSystem time has a resolution less than 100ns.

void ACE_Utils::UUID_Generator::init

(

void

)

Initialize the UUID generator

Deprecated:

This method may go away in some future release.

ACE_SYNCH_MUTEX * ACE_Utils::UUID_Generator::lock

(

void

)

The locking strategy prevents multiple generators from accessing the UUID_state at the same time. Get the locking strategy.

void ACE_Utils::UUID_Generator::lock	(	ACE_SYNCH_MUTEX *	lock,
		bool	release_lock
	)

Set a new locking strategy and return the old one.

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Member Data Documentation

bool ACE_Utils::UUID_Generator::destroy_lock_ [private]

bool ACE_Utils::UUID_Generator::is_init_ [private]

Initalization state of the generator.

ACE_SYNCH_MUTEX* ACE_Utils::UUID_Generator::lock_ [private]

UUID_Time ACE_Utils::UUID_Generator::time_last_ [private]

The system time when that last uuid was generated.

UUID_State ACE_Utils::UUID_Generator::uuid_state_ [private]

The UUID generator persistent state.

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The documentation for this class was generated from the following files:

• UUID.h
• UUID.cpp