mirror of https://gitee.com/bigwinds/arangodb
53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_UTILS_VERSION_TRACKER_H
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#define ARANGOD_UTILS_VERSION_TRACKER_H 1
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#include "Basics/Common.h"
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#include "Logger/Logger.h"
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namespace arangodb {
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/// @brief a class for tracking a global version number
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/// this version number is increased on every DDL operation, and may be sent
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/// to the agency in order to notify other listeners about DDL changes
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class VersionTracker {
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public:
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VersionTracker() : _value(0) {}
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void track(char const*) {
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++_value;
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// can enable this for tracking things later
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// LOG_TOPIC(TRACE, Logger::FIXME) << "version updated by " << msg;
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}
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uint64_t current() const { return _value; }
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private:
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std::atomic<uint64_t> _value;
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};
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} // namespace arangodb
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#endif
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