Repositório web para compartilhamento, reuso, versionamento e evolução de conteúdos binários : modelagem e análise por Redes de Petri coloridas

Abstract

The free availability of digital content has fairly increased on the Web. Many of these contents can be modified, reused and adapted for specific purposes. Although diferent resources for providing and storing contents are widely available, there is a lack of tools suitable to versioning control of binary content on the Internet. In addition, most solutions to persistent data on the Web are based on Relational DataBase (RDB). As a simple solution, we can modify the original data and store new records in the tables of a database. However, this leads to a possible ineficiency due to a potentially large amount of redundant information. Nevertheless, in order to overcome this issue, it is possible to adapt versioning tools, also known as Control Version System (CVS), to the solution. These tools are specialized in storage of the modified regions of documents. This process is known as "deltification". However, regarding access time and gathering data, a CVS is less eficient than a DataBase Management System (DBMS). Therefore, if a CVS is used as a solution for data persistence, this can reduce the overall performance of the application. Aiming at designing a repository of versioned binary content on the Web, with eficient management for both accessing and storing binary data, this work analyzes the performance of free DBMSs most frequently used and a CVS, which we consider being the most suitable to the addressed repository. The attained results were the basis for the specification of thearchitecture of a repository that relies on a hybrid approach. The resulting approach lies in the simultaneous use of a DBMS and a CVS. We took into account features and runtime performance of both tools for each operation required in the final application. Then, we designed models on colored Petri Nets, which allowed the simulation and analysis of the aimed architecture. As a result, we present the e ciency of the proposed architecture against a traditional storage approach.