Developing elements of technology to port Integro geoinformation system to Linux based on the system approach

The article discusses choosing a technological approach to porting a Windows desktop application that utilizes a non-cross-platform user interface component library, and that implements a plugin architecture, to Linux. The approach described can be used in cases when flexibility and low overhead is preferred over a ready-made solution. The work has been done based on systems analysis. A collection of existing options and their elements is examined. The resulting solution consists in using model-driven software development to separate platform-specific components from cross-platform ones by means of well-defined programming interfaces. The suggested version of a technology by which source code is generated from a declarative description of an object-oriented interface model provides interoperability between objects, residing in different modules and separated by a compiler or a runtime library boundary. The XML technology stack is used to implement validation, code completion and transformation of model descriptions into C++ source code. Interfaces are represented by virtual method tables. Each method is a C-style function. A reference to an interface is a structure containing a pointer to a virtual method table, and a pointer to an object instance. For each interface there is a number of declarations and definition generated: a set of function declarations, a virtual method table declaration, an interface reference structure declaration, wrappers for interface references and implementation base classes in C++. The technology is successfully applied in the development of INTEGRO geographic information system.

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