File indexing completed on 2024-06-16 04:50:17

 /*
     SPDX-FileCopyrightText: 2008 Volker Krause <vkrause@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #pragma once
 
 #include "akonadicore_export.h"
 
 #include <QMetaType>
 #include <QObject>
 
 namespace Akonadi
 {
 class ServerManagerPrivate;
 
 /**
  * @short Provides methods to control the Akonadi server process.
  *
  * Asynchronous, low-level control of the Akonadi server.
  * Akonadi::Control provides a synchronous interface to some of the methods in here.
  *
  * @author Volker Krause <vkrause@kde.org>
  * @see Akonadi::Control
  * @since 4.2
  */
 class AKONADICORE_EXPORT ServerManager : public QObject
 {
     Q_OBJECT
 public:
     /**
      * Enum for the various states the server can be in.
      * @since 4.5
      */
     enum State {
         NotRunning, ///< Server is not running, could be no one started it yet or it failed to start.
         Starting, ///< Server was started but is not yet running.
         Running, ///< Server is running and operational.
         Stopping, ///< Server is shutting down.
         Broken, ///< Server is not operational and an error has been detected.
         Upgrading ///< Server is performing a database upgrade as part of a new startup.
     };
 
     /**
      * Starts the server. This method returns immediately and does not wait
      * until the server is actually up and running.
      * @return @c true if the start was possible (which not necessarily means
      * the server is really running though) and @c false if an immediate error occurred.
      * @see Akonadi::Control::start()
      */
     static bool start();
 
     /**
      * Stops the server. This methods returns immediately after the shutdown
      * command has been send and does not wait until the server is actually
      * shut down.
      * @return @c true if the shutdown command was sent successfully, @c false
      * otherwise
      */
     static bool stop();
 
     /**
      * Shows the Akonadi self test dialog, which tests Akonadi for various problems
      * and reports these to the user if.
      * @param parent the parent widget for the dialog
      */
     static void showSelfTestDialog(QWidget *parent);
 
     /**
      * Checks if the server is available currently. For more detailed status information
      * see state().
      * @see state()
      */
     [[nodiscard]] static bool isRunning();
 
     /**
      * Returns the state of the server.
      * @since 4.5
      */
     [[nodiscard]] static State state();
 
     /**
      * Returns the reason why the Server is broken, if known.
      *
      * If state() is @p Broken, then you can use this method to obtain a more
      * detailed description of the problem and present it to users. Note that
      * the message can be empty if the reason is not known.
      *
      * @since 5.6
      */
     [[nodiscard]] static QString brokenReason();
 
     /**
      * Returns the identifier of the Akonadi instance we are connected to. This is usually
      * an empty string (representing the default instance), unless you have explicitly set
      * the AKONADI_INSTANCE environment variable to connect to a different one.
      * @since 4.10
      */
     [[nodiscard]] static QString instanceIdentifier();
 
     /**
      * Returns @c true if we are connected to a non-default Akonadi server instance.
      * @since 4.10
      */
     [[nodiscard]] static bool hasInstanceIdentifier();
 
     /**
      * Types of known D-Bus services.
      * @since 4.10
      */
     enum ServiceType {
         Server,
         Control,
         ControlLock,
         UpgradeIndicator,
     };
 
     /**
      * Returns the namespaced D-Bus service name for @p serviceType.
      * Use this rather the raw service name strings in order to support usage of a non-default
      * instance of the Akonadi server.
      * @param serviceType the service type for which to return the D-Bus name
      * @since 4.10
      */
     static QString serviceName(ServiceType serviceType);
 
     /**
      * Known agent types.
      * @since 4.10
      */
     enum ServiceAgentType {
         Agent,
         Resource,
         Preprocessor,
     };
 
     /**
      * Returns the namespaced D-Bus service name for an agent of type @p agentType with agent
      * identifier @p identifier.
      * @param agentType the agent type to use for D-Bus base name
      * @param identifier the agent identifier to include in the D-Bus name
      * @since 4.10
      */
     [[nodiscard]] static QString agentServiceName(ServiceAgentType agentType, const QString &identifier);
 
     /**
      * Adds the multi-instance namespace to @p string if required (with '_' as separator).
      * Use whenever a multi-instance safe name is required (configfiles, identifiers, ...).
      * @param string the string to adapt
      * @since 4.10
      */
     [[nodiscard]] static QString addNamespace(const QString &string);
 
     /**
      * Returns the singleton instance of this class, for connecting to its
      * signals
      */
     static ServerManager *self();
 
     enum OpenMode {
         ReadOnly,
         ReadWrite,
     };
     /**
      * Returns absolute path to akonadiserverrc file with Akonadi server
      * configuration.
      */
     [[nodiscard]] static QString serverConfigFilePath(OpenMode openMode);
 
     /**
      * Returns absolute path to configuration file of an agent identified by
      * given @p identifier.
      */
     [[nodiscard]] static QString agentConfigFilePath(const QString &identifier);
 
     /**
      * Returns current Akonadi database generation identifier
      *
      * Generation is guaranteed to never change unless as long as the database
      * backend is not removed and re-created. In such case it is guaranteed that
      * the new generation number will be higher than the previous one.
      *
      * Generation can be used by applications to detect when Akonadi database
      * has been recreated and thus some of the configuration (for example
      * collection IDs stored in a config file) must be invalidated.
      *
      * @note Note that the generation number is only available if the server
      * is running. If this function is called before the server starts it will
      * return 0.
      *
      * @since 5.4
      */
     [[nodiscard]] static uint generation();
 
 Q_SIGNALS:
     /**
      * Emitted whenever the server becomes fully operational.
      */
     void started();
 
     /**
      * Emitted whenever the server becomes unavailable.
      */
     void stopped();
 
     /**
      * Emitted whenever the server state changes.
      * @param state the new server state
      * @since 4.5
      */
     void stateChanged(Akonadi::ServerManager::State state);
 
 private:
     /// @cond PRIVATE
     friend class ServerManagerPrivate;
     ServerManager(ServerManagerPrivate *dd);
     ServerManagerPrivate *const d;
     /// @endcond
 };
 
 }
 
 Q_DECLARE_METATYPE(Akonadi::ServerManager::State)