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//$Id$
#ifndef ACE_UUID_H
#define ACE_UUID_H
#include "ace/pre.h"
#include "ace/OS.h"
#include "ace/SString.h"
#include "ace/Singleton.h"
typedef unsigned char Octet;
/**
* @class ACE_UUID
*
* ACE_UUID represebt a Universally Unique IDentifier (UUID)
* as described in (the expired) INTERNET-DRAFT
* specification entitled UUIDs and GUIDs. All instances of
* UUID are of the time-based variety. That is, the version
* number part of the timeHiAndVersion field is 1.
*
* The default constructor creates a nil UUID.
*
* UUIDs have value semantics. In addition, they may be
* compared for ordering and equality.
*
* Note: the statement of UUID uniqueness is less stringent
* than the requirement for UUID in general. There is no
* guarantee that a UUID generated by by this class is
* universally unique with respect to another arbitrary
* UUID.
*/
class ACE_Export ACE_UUID
{
public:
/**
* Type to hold a MAC address
*/
struct UUID_node_t
{
typedef enum { NODE_ID_SIZE = 6 } ;
typedef Octet NodeID[NODE_ID_SIZE];
bool operator == (const UUID_node_t& right) const;
bool operator != (const UUID_node_t& right) const;
bool operator < (const UUID_node_t& right) const;
NodeID nodeID;
};
struct UUID_t
{
// Data Members for Class Attributes
ACE_UINT32 timeLow;
ACE_UINT16 timeMid;
ACE_UINT16 timeHiAndVersion;
Octet clockSeqHiAndReserved;
Octet clockSeqLow;
ACE_UINT16 thr_id;
ACE_UINT32 pid;
UUID_node_t node;
};
ACE_UUID(void);
/**
* Copy constructor
*/
ACE_UUID(const ACE_UUID &right);
/**
* Construct a UUID based on a UUID_t
*/
ACE_UUID (const UUID_t& newUUID);
/**
* Constructs a UUID from a string representation.
*/
ACE_UUID (const ACE_SString& uuidString);
~ACE_UUID(void);
/**
* Assignment Operation
*/
ACE_UUID & operator=(const ACE_UUID &right);
/**
* Equality Operations
*/
bool operator==(const ACE_UUID &right) const;
bool operator!=(const ACE_UUID &right) const;
/**
* Relational Operations
*/
bool operator< (const ACE_UUID &right) const;
bool operator> (const ACE_UUID &right) const;
bool operator<=(const ACE_UUID &right) const;
bool operator>=(const ACE_UUID &right) const;
/**
* Returns a string representation of the UUID. Internally,
* the string representation, which is contained in as
* String, is only computed if this operation is called.
* Once the representation is computed it can never change.
*/
const ACE_SString* to_string (void);
static ACE_UUID NIL_UUID;
private:
/**
* The string representation of the UUID. This is created
* and updated only on demand.
*/
//mutable ACE_SString asString;
ACE_SString *as_string_;
// This ACE_UUID_Impl's representation of the UUID
UUID_t uuid_;
};
/**
* @class ACE_UUID_Generator
* Singleton class that generates UUIDs.
*/
class ACE_Export ACE_UUID_Generator
{
public:
//static ACE_UUID_Generator* instance();
// Format timestamp, clockseq, and nodeID into a VI UUID.
void generateV1(ACE_UUID::UUID_t&);
// Format timestamp, clockseq, and nodeID into a VI UUID.
ACE_UUID generateUUID ();
/**
* Type to represent UTC as a count of 100 nanosecond intervals since
* 00:00:00.00, 15 October 1582.
*/
typedef ACE_UINT64 UUID_time_t;
ACE_UUID_Generator();
~ACE_UUID_Generator();
private:
//friend class ACE_Singleton< ACE_UUID_Generator, ACE_SYNCH_MUTEX >;
/**
* The maximum number of uuids that can be generated per tick of the
* system clock. This number should be the number of 100ns ticks of the
* actual resolution of the system's clock.
*/
enum { UUIDS_PER_TICK = 1000 };
/**
* The number of uuids generated in this process since the last clock
* tick. Value never exceeds uuidsPerTick - 1.
*/
ACE_UINT32 uuidsThisTick;
/**
* The system time when that last uuid was generated.
*/
UUID_time_t timeLast;
/**
* Type to map to contain the UUID generator persistent state. This
* will be kept in memory mapped shared memory
*/
struct UUID_state
{
UUID_time_t timestamp;
ACE_UUID::UUID_node_t node;
ACE_UINT16 clockSequence;
};
/**
* Obtain a UUID timestamp. Compensate for the fact that the time
* obtained from getSystem time has a resolution less than 100ns.
*/
void getTimestamp( UUID_time_t& timestamp);
/**
* 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).
*/
void get_system_time( UUID_time_t& timeNow);
/**
* The UUID generator persistent state.
*/
UUID_state uuid_state_;
// No value semantics
//ACE_UNIMPLEMENTED_FUNC (ACE_UUID_Generator( const ACE_UUID_Generator&))
// ACE_UNIMPLEMENTED_FUNC (ACE_UUID_Generator& operator=( const ACE_UUID_Generator&))
};
typedef ACE_Singleton <ACE_UUID_Generator, ACE_Thread_Mutex> ACE_UUID_GENERATOR;
#if defined (__ACE_INLINE__)
#include "ace/UUID.i"
#endif /* __ACE_INLINE__ */
#include "ace/post.h"
#endif // ACE_UUID_H
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