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/* -*- C++ -*- */
//=============================================================================
/**
* @file ID_Generator.h
*
* @author Nanbor Wang
*/
//=============================================================================
#ifndef ACE_ID_GENERATOR_H
#define ACE_ID_GENERATOR_h
#include "ace/config-all.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#define ACE_OFFER_ID_LENGTH 21
/**
* @class ACE_ID_Generator
*
* @brief An unique ID generator.
*/
class ACE_ID_Generator
// Generate an offer ID according to current time and avoid
// duplicate ID. It guarantees ID uniqueness within a process,
// i.e. no two threads may get the same ID string. Using a
// similar method like the backery algorithm.
{
public:
/// allocate a new ID string and point <id> to it.
static char *get_new_id (char *id);
private:
/// Atomically get info required to generate an offer ID.
static void get_serial_id (time_t &t, size_t &s);
/// Get the lock instance.
static ACE_SYNCH_MUTEX *get_lock (void);
/// Record the time last offer ID generated.
static time_t last_time_;
/// Record serial number of last offer ID with same
/// generation time.
static size_t last_number_;
/// mutex to access private member.
static ACE_SYNCH_MUTEX *lock_;
};
#endif /* ACE_ID_GENERATOR_H */
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