mirror of https://gitee.com/bigwinds/arangodb
137 lines
4.5 KiB
C++
137 lines
4.5 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/ReadWriteLock.h"
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#include "Basics/Result.h"
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#include "VocBase/voc-types.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 <atomic>
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namespace rocksdb {
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class DB;
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class Transaction;
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}
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namespace arangodb {
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class RocksDBCounterManager {
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friend class RocksDBEngine;
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/// Constructor needs to be called synchronously,
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/// will load counts from the db and scan the WAL
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explicit RocksDBCounterManager(rocksdb::DB* db);
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public:
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struct CounterAdjustment {
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rocksdb::SequenceNumber _sequenceNum = 0;
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uint64_t _added = 0;
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uint64_t _removed = 0;
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TRI_voc_rid_t _revisionId = 0; // used for revision id
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CounterAdjustment() {}
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CounterAdjustment(rocksdb::SequenceNumber seq, uint64_t added,
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uint64_t removed, TRI_voc_rid_t revisionId)
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: _sequenceNum(seq), _added(added), _removed(removed), _revisionId(revisionId) {}
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rocksdb::SequenceNumber sequenceNumber() const {return _sequenceNum;};
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uint64_t added() const { return _added; }
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uint64_t removed() const { return _removed; }
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TRI_voc_rid_t revisionId() const { return _revisionId; }
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};
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/// Thread-Safe load a counter
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CounterAdjustment loadCounter(uint64_t objectId) const;
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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,
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CounterAdjustment const&);
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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(bool force);
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protected:
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struct CMValue {
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/// ArangoDB transaction ID
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rocksdb::SequenceNumber _sequenceNum;
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/// used for number of documents
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uint64_t _count;
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/// used for revision id
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TRI_voc_rid_t _revisionId;
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CMValue(rocksdb::SequenceNumber sq, uint64_t cc, TRI_voc_rid_t rid)
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: _sequenceNum(sq), _count(cc), _revisionId(rid) {}
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explicit CMValue(arangodb::velocypack::Slice const&);
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void serialize(arangodb::velocypack::Builder&) const;
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};
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void readSettings();
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void writeSettings();
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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, CMValue> _counters;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief synced sequence numbers
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//////////////////////////////////////////////////////////////////////////////
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std::unordered_map<uint64_t, rocksdb::SequenceNumber> _syncedSeqNums;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief currently syncing
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//////////////////////////////////////////////////////////////////////////////
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std::atomic<bool> _syncing;
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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 protect _syncing and _counters
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//////////////////////////////////////////////////////////////////////////////
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mutable basics::ReadWriteLock _rwLock;
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};
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}
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#endif
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