mirror of https://gitee.com/bigwinds/arangodb
88 lines
3.0 KiB
C++
88 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_MMFILES_MMFILES_TRANSACTION_MANAGER_H
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#define ARANGOD_MMFILES_MMFILES_TRANSACTION_MANAGER_H 1
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#include "Basics/Common.h"
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#include "Basics/ReadWriteLock.h"
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#include "StorageEngine/TransactionManager.h"
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#include "VocBase/voc-types.h"
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namespace arangodb {
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class MMFilesTransactionManager final : public TransactionManager {
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static constexpr size_t numBuckets = 16;
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public:
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MMFilesTransactionManager() : TransactionManager() {}
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~MMFilesTransactionManager() = default;
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// register a list of failed transactions
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void registerFailedTransactions(std::unordered_set<TRI_voc_tid_t> const& failedTransactions) override;
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// unregister a list of failed transactions
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void unregisterFailedTransactions(std::unordered_set<TRI_voc_tid_t> const& failedTransactions) override;
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// return the set of failed transactions
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std::unordered_set<TRI_voc_tid_t> getFailedTransactions() override;
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// register a transaction
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void registerTransaction(TRI_voc_tid_t transactionId,
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std::unique_ptr<TransactionData> data,
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bool isReadOnlyTransaction) override;
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// unregister a transaction
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void unregisterTransaction(TRI_voc_tid_t transactionId, bool markAsFailed, bool isReadOnlyTransaction) override;
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// iterate all the active transactions
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void iterateActiveTransactions(
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std::function<void(TRI_voc_tid_t, TransactionData const*)> const& callback) override;
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uint64_t getActiveTransactionCount() override;
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private:
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// hashes the transaction id into a bucket
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inline size_t getBucket(TRI_voc_tid_t id) const {
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return std::hash<TRI_voc_cid_t>()(id) % numBuckets;
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}
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// a lock protecting ALL buckets in _transactions
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basics::ReadWriteLock _allTransactionsLock;
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struct {
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// a lock protecting _activeTransactions and _failedTransactions
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basics::ReadWriteLock _lock;
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// currently ongoing transactions
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std::unordered_map<TRI_voc_tid_t, std::unique_ptr<TransactionData>> _activeTransactions;
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// set of failed transactions
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std::unordered_set<TRI_voc_tid_t> _failedTransactions;
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} _transactions[numBuckets];
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};
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} // namespace arangodb
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#endif
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