mirror of
https://github.com/ClickHouse/ClickHouse.git
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b79ead9c84
* Replicate poco into base/poco/ * De-register poco submodule * Build poco from ClickHouse * Exclude poco from stylecheck * Exclude poco from whitespace check * Exclude poco from typo check * Remove x bit from sources/headers (the style check complained) * Exclude poco from duplicate include check * Fix fasttest * Remove contrib/poco-cmake/* * Simplify poco build descriptions * Remove poco stuff not used by ClickHouse * Glob poco sources * Exclude poco from clang-tidy
105 lines
2.8 KiB
C++
105 lines
2.8 KiB
C++
//
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// UUIDGenerator.h
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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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// Definition of the UUIDGenerator class.
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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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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_UUIDGenerator_INCLUDED
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#define Foundation_UUIDGenerator_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/UUID.h"
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#include "Poco/Mutex.h"
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#include "Poco/Random.h"
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#include "Poco/Timestamp.h"
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#include "Poco/Environment.h"
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namespace Poco {
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class DigestEngine;
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class Foundation_API UUIDGenerator
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/// This class implements a generator for Universal Unique Identifiers,
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/// as specified in Appendix A of the DCE 1.1 Remote Procedure
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/// Call Specification (http://www.opengroup.org/onlinepubs/9629399/),
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/// RFC 2518 (WebDAV), section 6.4.1 and the UUIDs and GUIDs internet
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/// draft by Leach/Salz from February, 1998
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/// (http://ftp.ics.uci.edu/pub/ietf/webdav/uuid-guid/draft-leach-uuids-guids-01.txt)
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{
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public:
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UUIDGenerator();
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/// Creates the UUIDGenerator.
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~UUIDGenerator();
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/// Destroys the UUIDGenerator.
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UUID create();
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/// Creates a new time-based UUID, using the MAC address of
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/// one of the system's ethernet adapters.
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///
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/// Throws a SystemException if no MAC address can be
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/// obtained.
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UUID createFromName(const UUID& nsid, const std::string& name);
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/// Creates a name-based UUID.
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UUID createFromName(const UUID& nsid, const std::string& name, DigestEngine& de);
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/// Creates a name-based UUID, using the given digest engine.
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///
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/// Note: in order to create a standard-compliant UUID, the given DigestEngine
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/// must be either an instance of MD5Engine or SHA1Engine. The version field of
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/// the UUID will be set accordingly.
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UUID createFromName(const UUID& nsid, const std::string& name, DigestEngine& de, UUID::Version version);
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/// Creates a name-based UUID, using the given digest engine and version.
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UUID createRandom();
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/// Creates a random UUID.
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UUID createOne();
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/// Tries to create and return a time-based UUID (see create()), and,
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/// if that does not work due to the unavailability of a MAC address,
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/// creates and returns a random UUID (see createRandom()).
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///
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/// The UUID::version() method can be used to determine the actual kind of
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/// the UUID generated.
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static UUIDGenerator& defaultGenerator();
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/// Returns a reference to the default UUIDGenerator.
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protected:
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Timestamp::UtcTimeVal timeStamp();
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void getNode();
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private:
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FastMutex _mutex;
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Random _random;
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Timestamp _lastTime;
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int _ticks;
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Environment::NodeId _node;
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bool _haveNode;
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UUIDGenerator(const UUIDGenerator&);
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UUIDGenerator& operator = (const UUIDGenerator&);
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};
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} // namespace Poco
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#endif // Foundation_UUIDGenerator_INCLUDED
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