//  Copyright (C) 2007-2010  CEA/DEN, EDF R&D, OPEN CASCADE
//
//  Copyright (C) 2003-2007  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
//  CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2.1 of the License.
//
//  This library is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
//
//  See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
//

//  File   : DSC_Engines.idl
//  Author : Andre RIBES, EDF
//  $Header:
//
#ifndef _DSC_ENGINES_IDL_
#define _DSC_ENGINES_IDL_

#include "SALOME_Component.idl"
#include "SALOME_Ports.idl"

/*! \file DSC_Engines.idl 
     \brief interfaces that permits to add a dynamic port model to the SALOME object model. 
 */
module Engines {

  /*! \brief Interface of a DSC component.

    This interface defines the operations needed to add a component model with dynamic port 
    declaration to the SALOME object model. A component is a black box that interacts with 
    other components only by his ports. A port represents a connection point for the component. 
    In this model, a port is a CORBA interface, so a CORBA object.
    
    There is two ways for a component to interact with a port type :
    - It implements the port : it means "the component provides an implementation of the
    interface of the port". We design this kind of port as "provides ports". It provides an 
    interface to other components.
    - It needs to use an object that provides the port interface. We say that the component uses this 
    port type. It is represented by a "uses" port. A uses port can be connected with a provides port
    of the same interface type. When the connection is done, a component can use the "uses port" to use the 
    interface provided by the "provides port".
    
    The interface DSC implements the component interface that containes the operations that are needed 
    to manage declarations into a component and connections between ports.

    These operations are logicaly divided in two parts :
    - First part permits to add an get ports of a component.
    - Second part permits to connect/disconnect ports.
  */
  interface DSC : Engines::Component {

/*--------------------------------------------------------------------------------------------*/
/*-------------------------------------- Types Part ------------------------------------------*/

    //! a uses port
    /*!
      This sequence is a uses port. It's a sequence since a uses port can be
      connected with x provides port. Sometimes this kind of uses port is called multiple port.
      At this programming level, the user has to deal with the sequence. In the DSC_user 
      layer, the user only deals with one pointer.
    */  
    typedef sequence<Ports::Port> uses_port;

    //! This enumeration is used when the connection of a port (uses or provides) is changed. 
    /*!
      This information is for the component's user code.
    */  
    enum Message {AddingConnection,
                  RemovingConnection, 
                  ApplicationError};
    
    //!  This exception is raised when a port is used before it is added to the component.
    exception PortNotDefined {};
    
    //!  This exception is raised if you try to add a port with the same name than a previous defined port.
    exception PortAlreadyDefined {};
    
    //!  This exception is raised when you try to use a port that is not connected.
    exception PortNotConnected {};

    //! This exception is raised if the type of the provides port is bad.
    /*!
      This exception contains a string that gives what type is expected
      and the type that the operation received.
    */
    exception BadPortType {
      string expected;
      string received;
    };

    //!  Port's reference is Nil !
    exception NilPort {};

    //!  Port's reference is not the right reference.
    exception BadPortReference {};

    //!  Object property is not good for the port
    exception BadProperty {};


/*--------------------------------------------------------------------------------------------*/
/*-------------------------------------- Operation Part --------------------------------------*/

    //!  This operation adds a provides port to the component.
    /*!

      \param ref  port's Corba reference.
      \param provides_port_name port's name.
      \param port_prop port's property object.
    
      \exception PortAlreadyDefined
      \exception NilPort
      \exception BadProperty

      \note Notice that the name of the port is unique on a component. So if there is 
      a uses port that has the same name, the PortAlreadyDefined exception will be throw. 
      Also notice that each port as an object property that is associated with.
    */
    void add_provides_port(in Ports::Port ref, 
			   in string provides_port_name,
			   in Ports::PortProperties port_prop) raises(PortAlreadyDefined,
								      NilPort,
								      BadProperty);

    //!  This operation adds a uses port to the component.
    /*!

      \param repository_id  port's Corba repository id. 
	     Eg : IDL:toto.tata/MODULE/INTERFACE_NAME:1.0
      \param uses_port_name port's name.
      \param port_prop port's property object.

      \exception PortAlreadyDefined
      \exception BadProperty

      \note Notice that the name of the port is unique on the component. So if there is 
      a provides port that has the same name, the PortAlreadyDefined exception will be throw. 
      Also notice that each port as an object property that is associated with.
    */
    void add_uses_port(in string repository_id, 
		       in string uses_port_name,
		       in Ports::PortProperties port_prop) raises(PortAlreadyDefined,
								  BadProperty);

    //!  Get a provides port of the component.
    /*! 
      It can be used by the framework or the component himself.

      If it's the framework that wants the port, the reference has to be gived
      even if the port is not connected (boolean connection_error to false).
      Contrary, if it's the component that wants the port, the port is given
      in most of cases only if it is connected (boolean connection_error to true). 
      Notice that you can choose the behaviour that you want. 
     
      \param provides_port_name port's name.
      \param connection_error true if you want to wait that the port is connected with 
      an another port.
      \return port's Corba reference.

      \exception PortNotDefined
      \exception PortNotConnected
      \exception BadPortType

    */
    Ports::Port get_provides_port(in string provides_port_name,
				  in boolean connection_error) raises(PortNotDefined,
								      PortNotConnected,
								      BadPortType);

    //! Get a uses port of the component.
    /*! 
      It can be used by the framework or the component himself.
      Actually, only the user layer of the component will use this operation.
      A uses port could be obtained if and only if the uses port is connected. The sequence
      contains all the connections since a uses port can have multiple connections.

      There is a system of callbacks to prevent the user code that there is a new 
      (or a deletion) of a connection (see DSC_Callbacks class). 

      \param uses_port_name port's name.
      \return uses port's sequence.

      \exception PortNotDefined
      \exception PortNotConnected
      \exception BadPortType

      \see DSC_Callbacks
    */
    uses_port get_uses_port(in string uses_port_name) raises(PortNotDefined, 
							     PortNotConnected,
							     BadPortType);


    //!  Connect a provides port with a uses port.
    /*!

      \param provides_port_name provides port's name.

      \exception PortNotDefined

      \note Notice that the provides doesn't uses port names or component reference.
    */
    void connect_provides_port(in string provides_port_name) raises(PortNotDefined); 
    
    //!  Connect a uses port with a provides port.
    /*!

      \param uses_port_name uses port's name.
      \param provides_port_ref provides port's Corba reference.

      \exception PortNotDefined
      \exception BadPortType
      \exception NilPort
    */
    void connect_uses_port(in string uses_port_name, 
			   in Ports::Port provides_port_ref) raises(PortNotDefined, 
								    BadPortType, 
								    NilPort);

    //! Check if a port is connected. 
    /*!
      You can test a uses port or a provides port.

      \param port_name port's name.
      \return true if the uses port is connected.      

      \exception PortNotDefined
    */
    boolean is_connected(in string port_name) raises(PortNotDefined);

    //! Disconnect a uses port from a provides port.
    /*!

      \param provides_port_name provides port's name.
      \param message state associated with the disconnection.

      \exception PortNotDefined
      \exception PortNotConnected
    */
    void disconnect_provides_port(in string provides_port_name, 
				  in Engines::DSC::Message message) raises(PortNotDefined,
									   PortNotConnected);

    //!  Disconnect a provides port from a uses port.
    /*!

      \param uses_port_name uses port's name.
      \param provides_port_ref CORBA reference of the provides port.
      \param message state associated with the disconnection.
      
      \exception PortNotDefined
      \exception PortNotConnected
      \exception BadPortReference
    */
    void disconnect_uses_port(in string uses_port_name, 
			      in Ports::Port provides_port_ref, 
			      in Engines::DSC::Message message) raises(PortNotDefined,
								       PortNotConnected,
								       BadPortReference);
    //! Get port's property object.
    /*!

      \param port_name port's name.
      \return properties object's CORBA reference.

      \exception PortNotDefined
    */
    Ports::PortProperties get_port_properties(in string port_name) raises(PortNotDefined);

  };

  /*! \brief Interface of the ConnectionManager.
    It is a helper object for connection operations.
    The ConnectionManager is used like other services of SALOME (e.g ContainerManager).
  */
  interface ConnectionManager {
   
    //!  The Id given to the disconnect method is bad.
    exception BadId {};

    //!  A connection Id. It's unique.
    typedef short connectionId;

    //!  Connect a uses port with a provides port.
    /*!

      \param uses_component The component that have the uses port.
      \param uses_port_name uses port's name.
      \param provides_component The component that have the provides port.
      \param provides_port_name provides port's name.

      \exception Engines::DSC::PortNotDefined
      \exception Engines::DSC::BadPortType
      \exception Engines::DSC::NilPort

      \return the id of the connection that the ConnectionManager will use
      to release this connection when the framework (or a user script, ...) 
      will call ConnectionManager::disconnect.
    */ 
    connectionId connect(in Engines::DSC uses_component, 
			 in string uses_port_name, 
			 in Engines::DSC provides_component, 
			 in string provides_port_name) raises(Engines::DSC::PortNotDefined, 
							      Engines::DSC::BadPortType, 
							      Engines::DSC::NilPort);

    //!  Release a connection that has been previously created by the ConnectionManager.
    /*!

      \param id The id of the connection previously gived by the connect operation
      of the ConnectionManager.
      \param message state associated with the disconnection.

      \exception Engines::ConnectionManager::BadId
    */  
    void disconnect(in connectionId id,
		    in Engines::DSC::Message message) raises(Engines::ConnectionManager::BadId,
							     Engines::DSC::PortNotDefined,
							     Engines::DSC::PortNotConnected,
							     Engines::DSC::BadPortReference);

    //!  Shutdown the ConnectionManager process.
    oneway void ShutdownWithExit();

    //!  Return the PID of the connection manager
    long getPID();
  };

/*--------------------------------------------------------------------------------------------*/
  
  /*! \brief Interface of the Superv_Component. 
    This interface is a DSC component that contains services for the SALOME module SUPERV.
    This interface contains methods that are only in local (so they are described 
    and explained in the implementation class Superv_Component_i). These methods give access 
    to data-oriented ports provided by default by SALOME's kernel.
  */
  interface Superv_Component : Engines::DSC {
    
    //! Operation to create the service ports before it is executed
    /*! 
      The SUPERV module call this method before starting the service. Thus the service 
      can add its dynamics ports before it is started.

      \param service_name service's name.
      \return true if the service is correctly initialised.
     */
    boolean init_service(in string service_name);
  };
};

#endif
