mirror of https://gitee.com/bigwinds/arangodb
128 lines
4.3 KiB
C++
128 lines
4.3 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 Simon Grätzer
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_ROCKSDB_ENGINE_ROCKSDB_COUNTMANAGER_H
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#define ARANGOD_ROCKSDB_ENGINE_ROCKSDB_COUNTMANAGER_H 1
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#include <rocksdb/types.h>
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#include "Basics/Common.h"
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#include "Basics/ConditionVariable.h"
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#include "Basics/ReadWriteLock.h"
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#include "Basics/Result.h"
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#include "Basics/Thread.h"
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#include "RocksDBEngine/RocksDBTypes.h"
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#include <velocypack/Builder.h>
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#include <velocypack/Slice.h>
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#include <velocypack/velocypack-aliases.h>
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namespace rocksdb {
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class DB;
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class Transaction;
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class Snapshot;
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}
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namespace arangodb {
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class RocksDBCounterManager : Thread {
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friend class RocksDBEngine;
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RocksDBCounterManager(rocksdb::DB* db, double interval);
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public:
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struct Counter {
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rocksdb::SequenceNumber sequenceNumber;
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uint64_t value1; // used for number of documents
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uint64_t value2; // used for revision id
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Counter(rocksdb::SequenceNumber seq, uint64_t value1, uint64_t value2)
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: sequenceNumber(seq), value1(value1), value2(value2) {}
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explicit Counter(VPackSlice const&);
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void serialize(VPackBuilder&) const;
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};
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/// Constructor needs to be called synchrunously,
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/// will load counts from the db and scan the WAL
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/// Thread-Safe load a counter
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std::pair<uint64_t, uint64_t> loadCounter(uint64_t objectId);
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/// collections / views / indexes can call this method to update
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/// their total counts. Thread-Safe needs the snapshot so we know
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/// the sequence number used
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void updateCounter(uint64_t objectId, rocksdb::Snapshot const* snapshot,
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uint64_t value1, uint64_t value2);
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/// Thread-Safe remove a counter
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void removeCounter(uint64_t objectId);
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/// Thread-Safe force sync
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arangodb::Result sync();
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void beginShutdown() override;
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protected:
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void run() override;
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private:
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void readCounterValues();
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bool parseRocksWAL();
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//////////////////////////////////////////////////////////////////////////////
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/// @brief counter values
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//////////////////////////////////////////////////////////////////////////////
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std::unordered_map<uint64_t, Counter> _counters;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief counter values
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//////////////////////////////////////////////////////////////////////////////
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std::unordered_map<uint64_t, Counter> _syncedCounters;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief currently syncing
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//////////////////////////////////////////////////////////////////////////////
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bool _syncing = false;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief rocsdb instance
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//////////////////////////////////////////////////////////////////////////////
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rocksdb::DB* _db;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief interval i which we will sync
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//////////////////////////////////////////////////////////////////////////////
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double const _interval;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief condition variable for heartbeat
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//////////////////////////////////////////////////////////////////////////////
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arangodb::basics::ConditionVariable _condition;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief protect _syncing and _counters
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//////////////////////////////////////////////////////////////////////////////
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basics::ReadWriteLock _rwLock;
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};
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}
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#endif
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