mirror of https://gitee.com/bigwinds/arangodb
134 lines
5.0 KiB
C++
134 lines
5.0 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_ROCKSDB_ROCKSDB_TRANSACTION_COLLECTION_H
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#define ARANGOD_ROCKSDB_ROCKSDB_TRANSACTION_COLLECTION_H 1
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#include "Basics/Common.h"
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#include "StorageEngine/TransactionCollection.h"
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#include "VocBase/AccessMode.h"
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#include "VocBase/voc-types.h"
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namespace arangodb {
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struct RocksDBDocumentOperation;
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namespace transaction {
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class Methods;
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}
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class TransactionState;
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/// @brief collection used in a transaction
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class RocksDBTransactionCollection final : public TransactionCollection {
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public:
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RocksDBTransactionCollection(TransactionState* trx, TRI_voc_cid_t cid,
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AccessMode::Type accessType, int nestingLevel);
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~RocksDBTransactionCollection();
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/// @brief request a main-level lock for a collection
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/// returns TRI_ERROR_LOCKED in case the lock was successfully acquired
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/// returns TRI_ERROR_NO_ERROR in case the lock does not need to be acquired and no other error occurred
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/// returns any other error code otherwise
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int lockRecursive() override;
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/// @brief request a lock for a collection
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/// returns TRI_ERROR_LOCKED in case the lock was successfully acquired
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/// returns TRI_ERROR_NO_ERROR in case the lock does not need to be acquired and no other error occurred
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/// returns any other error code otherwise
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int lockRecursive(AccessMode::Type, int nestingLevel) override;
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/// @brief request an unlock for a collection
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int unlockRecursive(AccessMode::Type, int nestingLevel) override;
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/// @brief check whether a collection is locked in a specific mode in a
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/// transaction
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bool isLocked(AccessMode::Type, int nestingLevel) const override;
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/// @brief check whether a collection is locked at all
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bool isLocked() const override;
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/// @brief whether or not any write operations for the collection happened
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bool hasOperations() const override;
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void freeOperations(transaction::Methods* activeTrx,
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bool mustRollback) override;
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bool canAccess(AccessMode::Type accessType) const override;
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int updateUsage(AccessMode::Type accessType, int nestingLevel) override;
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int use(int nestingLevel) override;
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void unuse(int nestingLevel) override;
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void release() override;
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TRI_voc_rid_t revision() const { return _revision; }
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uint64_t numberDocuments() const {
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return _initialNumberDocuments + _numInserts - _numRemoves;
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}
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uint64_t numInserts() const { return _numInserts; }
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uint64_t numUpdates() const { return _numUpdates; }
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uint64_t numRemoves() const { return _numRemoves; }
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/// @brief add an operation for a transaction collection
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void addOperation(TRI_voc_document_operation_e operationType,
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uint64_t operationSize, TRI_voc_rid_t revisionId);
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void commitCounts();
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/// @brief Every index can track hashes inserted into this index
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/// Used to update the estimate after the trx commited
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void trackIndexInsert(uint64_t idxObjectId, uint64_t hash);
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/// @brief Every index can track hashes removed from this index
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/// Used to update the estimate after the trx commited
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void trackIndexRemove(uint64_t idxObjectId, uint64_t hash);
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private:
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/// @brief request a lock for a collection
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/// returns TRI_ERROR_LOCKED in case the lock was successfully acquired
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/// returns TRI_ERROR_NO_ERROR in case the lock does not need to be acquired and no other error occurred
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/// returns any other error code otherwise
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int doLock(AccessMode::Type, int nestingLevel);
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/// @brief request an unlock for a collection
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int doUnlock(AccessMode::Type, int nestingLevel);
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private:
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AccessMode::Type _lockType; // collection lock type, used for exclusive locks
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int _nestingLevel; // the transaction level that added this collection
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uint64_t _initialNumberDocuments;
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TRI_voc_rid_t _revision;
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uint64_t _operationSize;
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uint64_t _numInserts;
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uint64_t _numUpdates;
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uint64_t _numRemoves;
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bool _usageLocked;
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/// @brief A list where all indexes with estimates can store their operations
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/// Will be applied to the inserter on commit and not applied on abort
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std::unordered_map<uint64_t,
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std::pair<std::vector<uint64_t>, std::vector<uint64_t>>>
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_trackedIndexOperations;
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};
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}
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#endif
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