mirror of https://gitee.com/bigwinds/arangodb
113 lines
3.3 KiB
C++
113 lines
3.3 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_STATE_H
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#define ARANGOD_MMFILES_TRANSACTION_STATE_H 1
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#include "Basics/Common.h"
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#include "Basics/Result.h"
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#include "StorageEngine/TransactionState.h"
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namespace rocksdb {
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class Transaction;
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}
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namespace arangodb {
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class LocalDocumentId;
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class LogicalCollection;
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struct MMFilesDocumentOperation;
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class MMFilesWalMarker;
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/// @brief transaction type
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class MMFilesTransactionState final : public TransactionState {
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public:
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MMFilesTransactionState(TRI_vocbase_t& vocbase, TRI_voc_tid_t tid,
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transaction::Options const& options);
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~MMFilesTransactionState();
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/// @brief begin a transaction
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Result beginTransaction(transaction::Hints hints) override;
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/// @brief commit a transaction
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Result commitTransaction(transaction::Methods* trx) override;
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/// @brief abort a transaction
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Result abortTransaction(transaction::Methods* trx) override;
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bool hasFailedOperations() const override {
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return (_hasOperations && _status == transaction::Status::ABORTED);
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}
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/// @brief add a WAL operation for a transaction collection
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int addOperation(LocalDocumentId const& documentId, TRI_voc_rid_t revisionId,
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MMFilesDocumentOperation&, MMFilesWalMarker const* marker, bool&);
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/// @brief get the transaction id for usage in a marker
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TRI_voc_tid_t idForMarker() {
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if (isSingleOperation()) {
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return 0;
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}
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return _id;
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}
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/// @brief get (or create) a rocksdb WriteTransaction
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rocksdb::Transaction* rocksTransaction();
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private:
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/// @brief whether or not a marker needs to be written
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bool needWriteMarker(bool isBeginMarker) const {
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if (isBeginMarker) {
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return (!isReadOnlyTransaction() && !isSingleOperation());
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}
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return (isTopLevelTransaction() && _beginWritten && !isReadOnlyTransaction() &&
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!isSingleOperation());
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}
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/// @brief write WAL begin marker
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int writeBeginMarker();
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/// @brief write WAL abort marker
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int writeAbortMarker();
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/// @brief write WAL commit marker
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int writeCommitMarker();
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/// @brief free all operations for a transaction
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void freeOperations(transaction::Methods* activeTrx);
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private:
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rocksdb::Transaction* _rocksTransaction;
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bool _beginWritten;
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bool _hasOperations;
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/// @brief tick of last added & written operation
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TRI_voc_tick_t _lastWrittenOperationTick;
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};
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} // namespace arangodb
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#endif
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