86 lines
2.5 KiB
C++
86 lines
2.5 KiB
C++
#ifndef DBS_RELATION_MANAGER_H
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#define DBS_RELATION_MANAGER_H
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#include "Algebras/DBService2/Relation.hpp"
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#include "Algebras/DBService2/RecordManager.hpp"
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#include "Algebras/DBService2/SecondoNodeAdapter.hpp"
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#include <string>
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namespace DBService {
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class RelationManager : public RecordManager<DBService::Relation, SecondoRelationAdapter> {
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public:
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RelationManager(std::string newDatabase);
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/*
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Finds a Relation by its given relation database and relation name
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performing an in-memory search.
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Returns ~nullptr~ if such a Relations does not exist.
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*/
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std::shared_ptr<DBService::Relation> findByDatabaseAndName(
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std::string relationDatabase,
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std::string relationName);
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/*
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Searches all Relations in-memory and returns the existing original Node
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given an new (non-persisted) original Node.
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If no such original Node exists ~nullptr~ is returned.
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*/
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std::shared_ptr<DBService::Node> findOriginalNode(
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std::shared_ptr<DBService::Node> nodeToFind);
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/*
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Returns true if there's a Relation with a non-zero number of Replicas.
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*/
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bool doesRelationHaveReplicas(
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std::string relationDatabase,
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std::string relationName);
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/*
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Returns a random replica associated with the relation specified
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by the given ~relationDatabase~ and ~relationName~.
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Returns ~nullptr~ if no relation or replica could be found.
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*/
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std::shared_ptr<Replica> getRandomReplica(std::string relationDatabase,
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std::string relationName);
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/*
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Returns ~true~ if a Derivative with the provided ~derivativeName~ exists.
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return ~false~ otherwise.
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Searches for the Derivative by searching all Relations.
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*/
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bool doesDerivativeExist(std::string derivativeName);
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/*
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Deletes all Relations belonging to the provided ~relationDatabase~.
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*/
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void deleteRelationsByRelationDatabase(std::string relationDatabase);
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/*
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Destroys the relation specified by its ~relationDatabase~ and
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~relationName~.
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Does nothing if no relation is found.
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*/
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void deleteRelationByDatabaseAndName(std::string relationDatabase,
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std::string relationName);
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/*
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Destroys the derivative specified by its ~derivativeName~,
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~relationDatabase~ and ~relationName~.
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Does nothing if no relation or derivative is found.
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*/
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void deleteDerivativeByName(std::string relationDatabase,
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std::string relationName, std::string derivativeName);
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};
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}
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#endif |