mirror of https://gitee.com/bigwinds/arangodb
73 lines
2.6 KiB
C++
73 lines
2.6 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2017 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 Daniel H. Larkin
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_CACHE_TRANSACTION_WINDOW_H
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#define ARANGODB_CACHE_TRANSACTION_WINDOW_H
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#include "Basics/Common.h"
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#include <stdint.h>
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#include <atomic>
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namespace arangodb {
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namespace cache {
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////////////////////////////////////////////////////////////////////////////////
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/// @brief Manage windows in time when there are either no ongoing transactions
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/// or some.
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///
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/// Allows clients to start a transaction, end a transaction, and query an
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/// identifier for the current window.
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////////////////////////////////////////////////////////////////////////////////
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class TransactionWindow {
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public:
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//////////////////////////////////////////////////////////////////////////////
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/// @brief Initialize state with no open transactions.
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//////////////////////////////////////////////////////////////////////////////
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TransactionWindow();
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//////////////////////////////////////////////////////////////////////////////
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/// @brief Signal the beginning of a transaction.
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//////////////////////////////////////////////////////////////////////////////
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void start();
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//////////////////////////////////////////////////////////////////////////////
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/// @brief Signal the end of a transaction.
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//////////////////////////////////////////////////////////////////////////////
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void end();
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//////////////////////////////////////////////////////////////////////////////
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/// @brief Return the current window identifier.
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//////////////////////////////////////////////////////////////////////////////
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uint64_t term();
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private:
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std::atomic<uint64_t> _open;
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std::atomic<uint64_t> _term;
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};
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}; // end namespace cache
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}; // end namespace arangodb
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#endif
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