UUID UUIDGenerator::create() { FastMutex::ScopedLock lock(_mutex); if (!_haveNode) { Environment::nodeId(_node); _haveNode = true; } Timestamp::UtcTimeVal tv = timeStamp(); UInt32 timeLow = UInt32(tv & 0xFFFFFFFF); UInt16 timeMid = UInt16((tv >> 32) & 0xFFFF); UInt16 timeHiAndVersion = UInt16((tv >> 48) & 0x0FFF) + (UUID::UUID_TIME_BASED << 12); UInt16 clockSeq = (UInt16(_random.next() >> 4) & 0x3FFF) | 0x8000; return UUID(timeLow, timeMid, timeHiAndVersion, clockSeq, _node); }
UUID UUIDGenerator::createFromName(const UUID& nsid, const std::string& name, DigestEngine& de) { poco_assert_dbg (de.digestLength() >= 16); UUID netNsid = nsid; netNsid.toNetwork(); de.reset(); de.update(&netNsid._timeLow, sizeof(netNsid._timeLow)); de.update(&netNsid._timeMid, sizeof(netNsid._timeMid)); de.update(&netNsid._timeHiAndVersion, sizeof(netNsid._timeHiAndVersion)); de.update(&netNsid._clockSeq, sizeof(netNsid._clockSeq)); de.update(&netNsid._node[0], sizeof(netNsid._node)); de.update(name); char buffer[16]; const DigestEngine::Digest& d = de.digest(); for (int i = 0; i < 16; ++i) { buffer[i] = d[i]; } return UUID(buffer, UUID::UUID_NAME_BASED); }
UUID UUIDGenerator::createRandom() { char buffer[16]; RandomInputStream ris; ris.read(buffer, sizeof(buffer)); return UUID(buffer, UUID::UUID_RANDOM); }
#include "Poco/UUID.h" #include "Poco/UUIDGenerator.h" #include <iostream> using Poco::UUID; using Poco::UUIDGenerator; int main(int argc, char** argv) { UUIDGenerator& generator = UUIDGenerator::defaultGenerator(); UUID uuid1(generator.create()); // time based UUID uuid2(generator.createRandom()); UUID uuid3(generator.createFromName(UUID::uri(), "http://appinf.com")); std::cout << uuid1.toString() << std::endl; std::cout << uuid2.toString() << std::endl; std::cout << uuid3.toString() << std::endl; return 0; }