mirror of https://gitee.com/bigwinds/arangodb
115 lines
3.6 KiB
C++
115 lines
3.6 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 "Basics/Common.h"
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#include "Basics/Result.h"
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#include "Aql/Collection.h"
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#include "Transaction/StandaloneContext.h"
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#include "Transaction/Methods.h"
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#include "VocBase/vocbase.h"
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namespace arangodb {
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namespace aql {
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class AqlTransaction final : public transaction::Methods {
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public:
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/// @brief create the transaction and add all collections from the query
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/// context
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AqlTransaction(
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std::shared_ptr<transaction::Context> transactionContext,
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std::map<std::string, aql::Collection*> const* collections,
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bool isMainTransaction)
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: transaction::Methods(transactionContext),
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_collections(*collections) {
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if (!isMainTransaction) {
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addHint(transaction::Hints::Hint::LOCK_NEVER);
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} else {
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addHint(transaction::Hints::Hint::LOCK_ENTIRELY);
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}
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for (auto it : *collections) {
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if (!processCollection(it.second).ok()) {
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break;
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}
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}
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}
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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(
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std::map<std::string, aql::Collection*> const& collections) {
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Result res;
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for (auto const& it : collections) {
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res = processCollection(it.second);
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if (!res.ok()) {
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return res;
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}
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}
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return res;
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}
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/// @brief add a collection to the transaction
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Result processCollection(aql::Collection*);
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/// @brief add a coordinator collection to the transaction
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Result processCollectionCoordinator(aql::Collection*);
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/// @brief add a regular collection to the transaction
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Result processCollectionNormal(aql::Collection* collection);
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/// @brief documentCollection
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LogicalCollection* documentCollection(TRI_voc_cid_t cid);
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/// @brief clone, used to make daughter transactions for parts of a
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/// distributed
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/// AQL query running on the coordinator
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transaction::Methods* clone() const override {
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return new AqlTransaction(transaction::StandaloneContext::Create(vocbase()),
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&_collections, false);
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}
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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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/// @brief keep a copy of the collections, this is needed for the clone
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/// operation
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private:
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std::map<std::string, aql::Collection*> _collections;
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};
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}
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}
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#endif
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