live_component_lib_ref.h

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/*! \file
  \brief  The disti::LiveComponentLibRef class declaration.

  \par Copyright Information

  Copyright (c) 2017 by The DiSTI Corporation.<br>
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  <br>
  All rights reserved.<br>

  This Software contains proprietary trade secrets of DiSTI and may not be
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mechanical, or otherwise, without the written permission of DiSTI.  Said
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Derivative Works based on this or other copyrighted DiSTI Software.

  NO WARRANTY. THE SOFTWARE IS PROVIDED "AS-IS," WITHOUT WARRANTY OF ANY KIND,
AND ANY USE OF THIS SOFTWARE PRODUCT IS AT YOUR OWN RISK. TO THE MAXIMUM EXTENT
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AND CONDITIONS, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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  LIMITATION OF LIABILITY. TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW,
IN NO EVENT SHALL DISTI OR ITS SUPPLIERS BE LIABLE FOR ANY SPECIAL, INCIDENTAL,
INDIRECT, OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING, WITHOUT LIMITATION,
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*/
#ifndef _LIVE_COMPONENT_LIB_REF_H
#define _LIVE_COMPONENT_LIB_REF_H

#include "gls_include.h"
#include "gls_version.h"
#include <string>

namespace disti
{
class DynamicLibrary;
class ComponentBase;
#ifdef GLES
class RSOInterfaceES1;
typedef RSOInterfaceES1 RsoImplBaseInterface;
#else
class RSOInterface1;
typedef RSOInterface1 RsoImplBaseInterface;
#endif

class GlsRSOWrapper;

/** This class is used to load a live component DLL (or .so) and allow
  * easy calling of the live component library functions through the class methods.
  * The library remains loaded until the reference is changed to another file
  * or object destruction.
  */
class LiveComponentLibRef
{
public:
    /** Constructs a LiveComponentLibRef. */
    static GLS_EXPORT LiveComponentLibRef* CreateInstance( const LiveComponentLibRef& );
    /** Constructs a LiveComponentLibRef.  
      * \param filePath If a file path is specified, it will attempt a load immediatly.
      */
    static GLS_EXPORT LiveComponentLibRef* CreateInstance( const char* filePath = NULL );

    virtual GLS_EXPORT LiveComponentLibRef* CloneObject() const;

    /** Delete a LiveComponentLibRef instance using the
      * correct delete operator.
      */
    virtual GLS_EXPORT void DeleteInstance();

    GLS_EXPORT const LiveComponentLibRef& operator=( const LiveComponentLibRef& );

    /** Sets the desired file name (.DLL or .so).
      * Set to NULL to unload the current library. */
    GLS_EXPORT void LoadLibrary( const char* fileName, const bool searchLibraryPath = false );
    inline void     UnloadLibrary() { LoadLibrary( NULL ); }

    /** Returns true if the library was sucessfully loaded. */
    GLS_EXPORT bool Loaded() const;

    /** Returns the last error string or NULL if no error has occured. */
    GLS_EXPORT const char* ErrorString() const;

    /** Returns the path to the library or NULL if no library is loaded. */
    GLS_EXPORT const char* LoadedFilePath() const;

    /** Returns the built version info for the given class.
      * \param className The name of the class to check.
      * \returns If Loaded() is true and the className is valid, returns the compiler version associated with the given class.
      * Otherwise, the return value is undefined. */
    GLS_EXPORT const GlsBuiltVersionInfo& BuiltVersionInfo( const char* className ) const;

    /** \returns The DefaultClassName for the current LiveComponent Library if it is provided
      *          or NULL if it is unavailable. */
    GLS_EXPORT const char* DefaultClassName() const;

    /** Attempts to create a LiveComponent instance of the given class.
      * Call Destroy() on the object to delete it safely.
      * Objects returned by this method may not be safe to use if the GlsBuiltVersionInfo
      * for the LiveComponent Library does not match that of the container.
      * \param className The name of the class to instanciate.
      * \returns Pointer to the new instance if successful, NULL otherwise. */
    GLS_EXPORT ComponentBase* CreateLiveComponent( const char* className ) const;

    /** Safely delete an object that was returned from
      * CreateLiveComponent.
      * \param className Must be the same name that was passed to CreateLiveComponent
      * \param comp The component to delete */
    GLS_EXPORT void DeleteLiveComponent( const char* className, ComponentBase* comp ) const;

    /** Attempts to create a LiveComponent instance of the given class using the safe interface.
      * Call DestroyInstance() on the object to delete it safely.
      * \param className The name of the class to instanciate.
      * \param[out] RSOVersion The version number of the RSO and the returned interface
      * \returns Pointer to the new instance if successful, NULL otherwise. */
    GLS_EXPORT RsoImplBaseInterface* CreateRSOInterface( const char* className, unsigned int& RSOVersion ) const;

protected:
    /** Constructs a LiveComponentLibRef.  
      * Private - call CreateInstance instead
      * \param filePath If a file path is specified, it will attempt a load immediatly.
      */
    LiveComponentLibRef( const char* filePath = NULL );
    LiveComponentLibRef( const LiveComponentLibRef& );
    /** Destructor
      * Private - call DeleteInstance instead.
      */
    virtual GLS_EXPORT ~LiveComponentLibRef();

    std::string     _loadedFilePath;
    DynamicLibrary* _lib;
    char*           _errorString;

    GLS_EXPORT void DeleteLibrary();

    GLS_EXPORT bool UpdateLoad();

    GLS_EXPORT void SetErrorString( const char* value );

    void EnableDialogs( const char* className, bool value ) const;
};

} // namespace disti

#endif