mirror of https://gitee.com/bigwinds/arangodb
81 lines
3.0 KiB
C++
81 lines
3.0 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_UTILS_TRANSACTION_COLLECTION_H
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#define ARANGOD_UTILS_TRANSACTION_COLLECTION_H 1
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#include "Basics/Common.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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class LogicalCollection;
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struct MMFilesDocumentOperation;
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struct TransactionState;
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/// @brief collection used in a transaction
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struct TransactionCollection {
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friend struct TransactionState;
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TransactionCollection(TransactionState* trx, TRI_voc_cid_t cid, AccessMode::Type accessType, int nestingLevel)
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: _transaction(trx), _cid(cid), _accessType(accessType), _nestingLevel(nestingLevel), _collection(nullptr), _operations(nullptr),
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_originalRevision(0), _lockType(AccessMode::Type::NONE), _compactionLocked(false), _waitForSync(false) {}
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public:
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/// @brief request a lock for a collection
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int lock(AccessMode::Type, int nestingLevel);
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/// @brief request an unlock for a collection
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int unlock(AccessMode::Type, int nestingLevel);
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/// @brief check whether a collection is locked in a specific mode in a transaction
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bool isLocked(AccessMode::Type, int nestingLevel) const;
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/// @brief check whether a collection is locked at all
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bool isLocked() const;
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private:
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/// @brief request a lock for a collection
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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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public:
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TransactionState* _transaction; // the transaction
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TRI_voc_cid_t const _cid; // collection id
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AccessMode::Type _accessType; // access type (read|write)
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int _nestingLevel; // the transaction level that added this collection
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LogicalCollection* _collection; // vocbase collection pointer
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std::vector<MMFilesDocumentOperation*>* _operations;
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TRI_voc_rid_t _originalRevision; // collection revision at trx start
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AccessMode::Type _lockType; // collection lock type
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bool
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_compactionLocked; // was the compaction lock grabbed for the collection?
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bool _waitForSync; // whether or not the collection has waitForSync
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};
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}
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#endif
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