Nagornyi K. Models and tools for maintenance of program systems based on post object-oriented technologies

The actual scientific-applied problem to design models and information technologies for estimation of usage effectiveness of post object-oriented technologies (POOT) in legacy software systems (LSS) maintenance process. Issues of LSS, developed based on object-oriented approach, maintenance process were examined among which, a problem of the crosscutting functionality (CF) phenomenon emergence in LSS was focused on. Main POOT were analyzed: aspect-oriented software development (AOSD), feature-oriented software development (FOSD), context-oriented software development (COSD). POOT are based on object-oriented approach and have mechanisms for isolation of the CF source code of a basic functionality source code, and a posterior non-invasive injection it back. An issue of the effectiveness coefficient estimation of POOT usage was formalized. In order to solve it the knowledge-oriented approach was proposed based on the model of the multidimensional informational space, and it consist of four coherent issues, namely: Issue 1 - to elaborate an approach for initial LSS-type definition, based on its structural complexity and functional requirements (FR) state; Issue 2 - to elaborate a method for cost assessment on a program modification of an LSS with POOT usage; Issue 3 - construct metrics to estimate the CF-level in LSS; Issue 4 - to propose an approach for quantitative estimation of the final usage effectiveness of a specific POOT for a particular LSS-type taking into account solutions of 1-3 issues. To resolve Issue 1, logic-linguistic approach was proposed for FR current state assessment and a motivated choice of an object-oriented metric collection for structural complexity calculation was done. Based on which a method of an LSS-type definition was proposed. In order to solve Issue 2 architectural models for technological features of POOTs were elaborated and proposed metrics and algorithms for cost estimation of an LSS modification with an appropriate POOT: AOSD, FOSD or COSD. For Issue 3 resolving a classification of CF was performed and a combined metric for CF-level in LSS was elaborated. Finally, to perform Issue 4 an algorithmic model for informational technology performing was introduced and the procedure for complex effectiveness estimation of POOT based on fuzzy-logic was elaborated. Based on the elaborated algorithmic model and the effectiveness estimation procedure, the informational technology was elaborated. It includes the experimental technique and the integrated CASE-tool designed for complex effectiveness estimation of POOT's usage in LSS maintenance process. The obtained results were analyzed and practical advices were given concerning POOT's usage in LSS maintenance.