mirror of https://gitee.com/bigwinds/arangodb
116 lines
3.7 KiB
C++
116 lines
3.7 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 Michael Hackstein
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_AQL_ENGINE_INFO_CONTAINER_COORDINATOR_H
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#define ARANGOD_AQL_ENGINE_INFO_CONTAINER_COORDINATOR_H 1
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#include "Basics/Common.h"
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#include "Aql/types.h"
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#include "Cluster/ClusterInfo.h"
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#include <stack>
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namespace arangodb {
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namespace aql {
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class ExecutionEngine;
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class ExecutionEngineResult;
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class ExecutionNode;
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class Query;
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class QueryRegistry;
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class EngineInfoContainerCoordinator {
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private:
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struct EngineInfo {
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public:
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EngineInfo(QueryId id, size_t idOfRemoteNode);
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~EngineInfo();
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#if (_MSC_VER != 0)
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#pragma warning(disable : 4521) // stfu wintendo.
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#endif
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EngineInfo(EngineInfo&) = delete;
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EngineInfo(EngineInfo const& other) = delete;
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EngineInfo(EngineInfo const&& other);
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void addNode(ExecutionNode* en);
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Result buildEngine(Query* query, QueryRegistry* queryRegistry, std::string const& dbname,
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std::unordered_set<std::string> const& restrictToShards,
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MapRemoteToSnippet const& dbServerQueryIds,
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std::vector<uint64_t>& coordinatorQueryIds) const;
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QueryId queryId() const { return _id; }
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private:
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// The generated id how we can find this query part
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// in the coordinators registry.
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QueryId const _id;
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// The nodes belonging to this plan.
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std::vector<ExecutionNode*> _nodes;
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// id of the remote node this plan collects data from
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size_t _idOfRemoteNode;
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};
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public:
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EngineInfoContainerCoordinator();
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~EngineInfoContainerCoordinator();
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// Insert a new node into the last engine on the stack
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void addNode(ExecutionNode* node);
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// Open a new snippet, which is connected to the given remoteNode id
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void openSnippet(size_t idOfRemoteNode);
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// Close the currently open snippet.
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// This will finallizes the EngineInfo from the given information
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// This will intentionally NOT insert the Engines into the query
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// registry for easier cleanup
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// Returns the queryId of the closed snippet
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QueryId closeSnippet();
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// Build the Engines on the coordinator
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// * Creates the ExecutionBlocks
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// * Injects all Parts but the First one into QueryRegistery
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// Return the first engine which is not added in the Registry
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ExecutionEngineResult buildEngines(Query* query, QueryRegistry* registry,
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std::string const& dbname,
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std::unordered_set<std::string> const& restrictToShards,
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MapRemoteToSnippet const& dbServerQueryIds,
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std::vector<uint64_t>& coordinatorQueryIds) const;
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private:
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// @brief List of EngineInfos to distribute accross the cluster
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std::vector<EngineInfo> _engines;
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std::stack<size_t> _engineStack;
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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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