78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
#ifndef ASYNCDBCONNECTION_H
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#define ASYNCDBCONNECTION_H
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#include <QObject>
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#include "Pgsql_Connection.h"
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#include "Pgsql_Params.h"
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#include "Pgsql_Result.h"
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#include "Expected.h"
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#include "ConnectionConfig.h"
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#include <QElapsedTimer>
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#include <mutex>
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#include <memory>
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class ASyncDBConnectionThread;
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/** \brief Class that handles asynchronous execution of queries.
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*
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* Queries are passed to this class with a routine to call on completion
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* when the result is on that routine is called.
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*/
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class ASyncDBConnection: public QObject {
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Q_OBJECT
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public:
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enum class State {
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NotConnected,
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Connecting,
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Connected, ///< connected and idle
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QuerySend, ///< connected query send expecting result
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CancelSend, ///< cancel send expecting result
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Terminating ///< shutting down
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};
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using on_result_callback = std::function<void(Expected<std::shared_ptr<Pgsql::Result>>, qint64)>;
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explicit ASyncDBConnection();
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~ASyncDBConnection();
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State state() const;
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void setupConnection(const ConnectionConfig &config);
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void closeConnection();
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/** Sends command to the server.
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When the result is in on_result will be called directly within the thread.
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If the command gives multiple results on_result will be called for each result.
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*/
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bool send(const std::string &command, on_result_callback on_result);
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bool send(const std::string &command, Pgsql::Params params, on_result_callback on_result);
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bool cancel();
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Q_SIGNALS:
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void onStateChanged(ASyncDBConnection::State state);
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void onNotice(Pgsql::ErrorDetails notice);
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private:
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Pgsql::Connection m_connection;
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std::unique_ptr<ASyncDBConnectionThread> m_threadData;
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std::thread m_thread;
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ConnectionConfig m_config;
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State m_state = State::NotConnected;
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Pgsql::Canceller m_canceller;
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QElapsedTimer m_timer;
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void doStateCallback(State state);
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void processNotice(const PGresult *result);
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friend class ASyncDBConnectionThread;
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};
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Q_DECLARE_METATYPE(ASyncDBConnection::State);
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Q_DECLARE_METATYPE(Pgsql::ErrorDetails);
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Q_DECLARE_METATYPE(std::shared_ptr<Pgsql::Result>);
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#endif // ASYNCDBCONNECTION_H
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