mirror of https://gitee.com/bigwinds/arangodb
88 lines
3.4 KiB
C++
88 lines
3.4 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_AQL_AQL_TRANSACTION_H
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#define ARANGOD_AQL_AQL_TRANSACTION_H 1
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#include "Aql/Collection.h"
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#include "Basics/Common.h"
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#include "Basics/Result.h"
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#include "Transaction/Methods.h"
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#include "Transaction/Options.h"
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#include "Transaction/StandaloneContext.h"
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#include "VocBase/vocbase.h"
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#include <map>
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namespace arangodb {
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namespace aql {
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class AqlTransaction : public transaction::Methods {
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public:
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/// @brief create the transaction and add all collections
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/// from the query context
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static std::shared_ptr<AqlTransaction>
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create(std::shared_ptr<transaction::Context> const& transactionContext,
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std::map<std::string, aql::Collection*> const* collections,
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transaction::Options const& options, bool isMainTransaction,
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std::unordered_set<std::string> inaccessibleCollections =
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std::unordered_set<std::string>());
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/// @brief end the transaction
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~AqlTransaction() {}
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/// @brief add a list of collections to the transaction
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Result addCollections(std::map<std::string, aql::Collection*> const& collections);
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/// @brief documentCollection
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LogicalCollection* documentCollection(TRI_voc_cid_t cid);
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/// @brief lockCollections, this is needed in a corner case in AQL: we need
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/// to lock all shards in a controlled way when we set up a distributed
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/// execution engine. To this end, we prevent the standard mechanism to
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/// lock collections on the DBservers when we instantiate the query. Then,
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/// in a second round, we need to lock the shards in exactly the right
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/// order via an HTTP call. This method is used to implement that HTTP action.
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int lockCollections() override;
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AqlTransaction(std::shared_ptr<transaction::Context> const& transactionContext,
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transaction::Options const& options);
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/// protected so we can create different subclasses
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AqlTransaction(std::shared_ptr<transaction::Context> const& transactionContext,
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std::map<std::string, aql::Collection*> const* collections,
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transaction::Options const& options, bool isMainTransaction);
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/// @brief add a collection to the transaction
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Result processCollection(aql::Collection*);
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protected:
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/// @brief keep a copy of the collections, this is needed for the clone
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/// operation
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std::map<std::string, aql::Collection*> _collections;
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};
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} // namespace aql
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} // namespace arangodb
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#endif
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