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165 lines
3.9 KiB
C++
165 lines
3.9 KiB
C++
//
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// UUIDGenerator.cpp
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//
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// $Id: //poco/1.4/Foundation/src/UUIDGenerator.cpp#1 $
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//
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// Library: Foundation
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// Package: UUID
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// Module: UUID
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#include "Poco/UUIDGenerator.h"
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#include "Poco/Thread.h"
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#include "Poco/RandomStream.h"
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#include "Poco/DigestEngine.h"
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#include "Poco/MD5Engine.h"
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#include "Poco/SingletonHolder.h"
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#include <cstring>
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namespace Poco {
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UUIDGenerator::UUIDGenerator(): _ticks(0), _haveNode(false)
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{
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}
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UUIDGenerator::~UUIDGenerator()
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{
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}
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UUID UUIDGenerator::create()
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{
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FastMutex::ScopedLock lock(_mutex);
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if (!_haveNode)
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{
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Environment::nodeId(_node);
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_haveNode = true;
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}
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Timestamp::UtcTimeVal tv = timeStamp();
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UInt32 timeLow = UInt32(tv & 0xFFFFFFFF);
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UInt16 timeMid = UInt16((tv >> 32) & 0xFFFF);
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UInt16 timeHiAndVersion = UInt16((tv >> 48) & 0x0FFF) + (UUID::UUID_TIME_BASED << 12);
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UInt16 clockSeq = (UInt16(_random.next() >> 4) & 0x3FFF) | 0x8000;
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return UUID(timeLow, timeMid, timeHiAndVersion, clockSeq, _node);
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}
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UUID UUIDGenerator::createFromName(const UUID& nsid, const std::string& name)
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{
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MD5Engine md5;
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return createFromName(nsid, name, md5);
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}
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UUID UUIDGenerator::createFromName(const UUID& nsid, const std::string& name, DigestEngine& de)
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{
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poco_assert_dbg (de.digestLength() >= 16);
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UUID netNsid = nsid;
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netNsid.toNetwork();
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de.reset();
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de.update(&netNsid._timeLow, sizeof(netNsid._timeLow));
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de.update(&netNsid._timeMid, sizeof(netNsid._timeMid));
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de.update(&netNsid._timeHiAndVersion, sizeof(netNsid._timeHiAndVersion));
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de.update(&netNsid._clockSeq, sizeof(netNsid._clockSeq));
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de.update(&netNsid._node[0], sizeof(netNsid._node));
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de.update(name);
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char buffer[16];
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const DigestEngine::Digest& d = de.digest();
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for (int i = 0; i < 16; ++i)
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{
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buffer[i] = d[i];
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}
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return UUID(buffer, UUID::UUID_NAME_BASED);
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}
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UUID UUIDGenerator::createRandom()
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{
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char buffer[16];
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RandomInputStream ris;
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ris.read(buffer, sizeof(buffer));
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return UUID(buffer, UUID::UUID_RANDOM);
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}
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Timestamp::UtcTimeVal UUIDGenerator::timeStamp()
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{
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Timestamp now;
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for (;;)
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{
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if (now != _lastTime)
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{
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_lastTime = now;
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_ticks = 0;
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break;
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}
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if (_ticks < 100)
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{
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++_ticks;
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break;
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}
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now.update();
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}
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Timestamp::UtcTimeVal tv = now.utcTime();
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return tv + _ticks;
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}
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UUID UUIDGenerator::createOne()
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{
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try
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{
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return create();
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}
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catch (Exception&)
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{
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return createRandom();
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}
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}
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namespace
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{
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static SingletonHolder<UUIDGenerator> sh;
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}
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UUIDGenerator& UUIDGenerator::defaultGenerator()
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{
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return *sh.get();
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}
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} // namespace Poco
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