mirror of https://gitee.com/bigwinds/arangodb
86 lines
2.7 KiB
C++
86 lines
2.7 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2018 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 Kaveh Vahedipour
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_CONSENSUS_INCEPTION_H
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#define ARANGOD_CONSENSUS_INCEPTION_H 1
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#include <memory>
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#include "Agency/AgencyCommon.h"
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#include "Basics/Common.h"
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#include "Basics/ConditionVariable.h"
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#include "Basics/Mutex.h"
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#include "Basics/Thread.h"
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#include <velocypack/Builder.h>
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#include <velocypack/velocypack-aliases.h>
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namespace arangodb {
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namespace consensus {
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class Agent;
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/// @brief This class organizes the startup of the agency until the point
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/// where the RAFT implementation can commence function
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class Inception : public Thread {
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public:
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/// @brief Construct with agent
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explicit Inception(Agent&);
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/// @brief Defualt dtor
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virtual ~Inception();
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/// @brief Report acknowledged version for peer id
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void reportVersionForEp(std::string const&, size_t);
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void beginShutdown() override;
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void run() override;
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void signalConditionVar();
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private:
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/// @brief We are a restarting active RAFT agent
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///
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/// Make sure that majority of agents agrees on pool and active list.
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/// Subsequently, start agency. The exception to agreement over active agent
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/// list among peers is if an agent joins with empty active list. This allows
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/// for a peer with empty list to join nevertheless.
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/// The formation of an agency is tried for an hour before giving up.
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bool restartingActiveAgent();
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/// @brief Gossip your way into the agency
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///
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/// No persistence: gossip an agency together.
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void gossip();
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Agent& _agent; //< @brief The agent
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arangodb::basics::ConditionVariable _cv; //< @brief For proper shutdown
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std::unordered_map<std::string, size_t> _acked; //< @brief acknowledged config version
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mutable arangodb::Mutex _vLock; //< @brieg Guard _acked
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};
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} // namespace consensus
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} // namespace arangodb
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#endif
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