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UUIDGenerator.h
//
// UUIDGenerator.h
//
// $Id: //poco/1.3/Foundation/include/Poco/UUIDGenerator.h#3 $
//
// Library: Foundation
// Package: UUID
// Module:  UUID
//
// Definition of the UUIDGenerator class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#ifndef Foundation_UUIDGenerator_INCLUDED
#define Foundation_UUIDGenerator_INCLUDED


#include "Poco/Foundation.h"
#include "Poco/UUID.h"
#include "Poco/Mutex.h"
#include "Poco/Random.h"
#include "Poco/Timestamp.h"
#include "Poco/Environment.h"


namespace Poco {


class DigestEngine;


00057 class Foundation_API UUIDGenerator
      /// This class implements a generator for Universal Unique Identifiers,
      /// as specified in Appendix A of the DCE 1.1 Remote Procedure
      /// Call Specification (http://www.opengroup.org/onlinepubs/9629399/),
      /// RFC 2518 (WebDAV), section 6.4.1 and the UUIDs and GUIDs internet
      /// draft by Leach/Salz from February, 1998 
      /// (http://ftp.ics.uci.edu/pub/ietf/webdav/uuid-guid/draft-leach-uuids-guids-01.txt)
{
public:
      UUIDGenerator();
            /// Creates the UUIDGenerator.

      ~UUIDGenerator();
            /// Destroys the UUIDGenerator.

      UUID create();
            /// Creates a new time-based UUID, using the MAC address of
            /// one of the system's ethernet adapters.
            ///
            /// Throws a SystemException if no MAC address can be
            /// obtained.
      
      UUID createFromName(const UUID& nsid, const std::string& name);
            /// Creates a name-based UUID.

      UUID createFromName(const UUID& nsid, const std::string& name, DigestEngine& de);
            /// Creates a name-based UUID, using the given digest engine.
            
      UUID createRandom();
            /// Creates a random UUID.
            
      UUID createOne();
            /// Tries to create and return a time-based UUID (see create()), and, 
            /// if that does not work due to the unavailability of a MAC address,
            /// creates and returns a random UUID (see createRandom()).
            ///
            /// The UUID::version() method can be used to determine the actual kind of
            /// the UUID generated.

      static UUIDGenerator& defaultGenerator();
            /// Returns a reference to the default UUIDGenerator.
            
protected:
      Timestamp::UtcTimeVal timeStamp();
      void getNode();

private:
      FastMutex           _mutex;
      Random              _random;
      Timestamp           _lastTime;
      int                 _ticks;
      Environment::NodeId _node;
      bool                _haveNode;
      
      UUIDGenerator(const UUIDGenerator&);
      UUIDGenerator& operator = (const UUIDGenerator&);
};


} // namespace Poco


#endif // Foundation_UUIDGenerator_INCLUDED

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