mirror of https://gitee.com/bigwinds/arangodb
80 lines
2.9 KiB
C++
80 lines
2.9 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_MMFILES_TRANSACTION_COLLECTION_H
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#define ARANGOD_MMFILES_TRANSACTION_COLLECTION_H 1
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#include "Basics/Common.h"
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#include "Basics/SmallVector.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 MMFilesDocumentOperation;
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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 MMFilesTransactionCollection final : public TransactionCollection {
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public:
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MMFilesTransactionCollection(TransactionState* trx, TRI_voc_cid_t cid,
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AccessMode::Type accessType, int nestingLevel);
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~MMFilesTransactionCollection();
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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, bool mustRollback) override;
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bool canAccess(AccessMode::Type accessType) const 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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void addOperation(MMFilesDocumentOperation* operation);
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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
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/// and no other error occurred returns any other error code otherwise
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int doLock(AccessMode::Type, int nestingLevel) override;
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/// @brief request an unlock for a collection
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int doUnlock(AccessMode::Type, int nestingLevel) override;
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private:
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SmallVector<MMFilesDocumentOperation*, 64>::allocator_type::arena_type _arena;
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SmallVector<MMFilesDocumentOperation*, 64> _operations;
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TRI_voc_rid_t _originalRevision; // collection revision at trx start
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bool _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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} // namespace arangodb
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#endif
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