source: pacpusframework/trunk/include/Pacpus/kernel/ComponentBase.h@ 36

/**
 *
 * Distributed under the UTC Heudiascy Pacpus License, Version 1.0.
 * Copyright (c) UTC Heudiasyc 2010 - 2013. All rights reserved.
 *
 * See the LICENSE file for more information or a copy at:
 *   http://www.hds.utc.fr/~kurdejma/LICENSE_1_0.txt
 *
 */
 
#ifndef DEF_PACPUS_COMPONENTBASE_H
#define DEF_PACPUS_COMPONENTBASE_H

#include <Pacpus/kernel/ComponentManager.h>
#include <Pacpus/kernel/pacpus.h>
#include <Pacpus/kernel/XmlComponentConfig.h>

#include <QString>

namespace pacpus
{
  class ComponentManager;

  /** ComponentBase
   * @brief Base class of a Pacpus component.
   */
  class PACPUSLIB_API ComponentBase
  {
    friend class ComponentManager;
    public:
      /**
       * Enumeration of the state that can take a component, the three last states suppose
       * that the component is started.
       */
      enum COMPONENT_STATE
      {
        STOPPED,
        NOT_MONITORED,
        MONITOR_OK,
        MONITOR_NOK
      };

      /** Resulting state of a component after its configuration. */
      enum COMPONENT_CONFIGURATION
      {
        CONFIGURED_OK,
        NOT_CONFIGURED,
        CONFIGURATION_DELAYED,
        CONFIGURED_FAILED
      };

      /** Ctor of ComponentBase.
       * @param name Name of your component.
       */
      ComponentBase(const QString& name);

      /** Dtor of ComponentBase. */
      virtual ~ComponentBase();

      /** Return the state of the component.
       * @return Value of the current state.
       */
      COMPONENT_STATE getState();

      /** Check whether the component if configurer or not.
       * @return True if the component is configured, otherwise false.
       */
      bool isConfigured() const;

    protected:
      /** Change the state of the component.
       * @param state New component state.
       */
      void setState(COMPONENT_STATE state);

      /** Called when the component starts, you must override this function. */
      virtual void startActivity() = 0;

      /** Called when the component stops, you must override this function. */
      virtual void stopActivity() = 0;

      /** Called by the ComponentManager, it configure the component thanks a XML node.
       * @param config Component's XML node.
       * @return State of the configuration.
       * FIXME: 'config' should be const, but we can't change the prototype without breaking
       * old stuff.
       */
      virtual COMPONENT_CONFIGURATION configureComponent(XmlComponentConfig config) = 0;

      // The XML node that is got in the configureComponent method
      XmlComponentConfig param;

      // the name of the component. It is this one in the XML config file
      QString componentName;

      // is the component is recording data?
      bool recording;

      // provided for compatibility with old DBITE framework
      bool THREAD_ALIVE;

      // is the component active?
      bool mIsActive;

      // a pointer to the manager of components
      ComponentManager * mgr;

    private:
      // called by the ComponentManager to start the component
      int startComponent();

      // called by the ComponentManager to stop the component
      int stopComponent();

      // store the state of the component
      COMPONENT_STATE componentState_;

      // is the component configured (ie configureComponent method was called)
      COMPONENT_CONFIGURATION configuration_;
  };
}

#endif