Dissertaç ˜ao de Mestrado Mestrado em Engenharia Informática Jo ...

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7. CONCLUSION AND FUTURE WORK 7.1. Future Work cation pre or post installation on the virtual appliance. Configuring the application before its installation on the virtual appliance consists on altering the configuration file in the application package and then install it on the virtual appliance. This approach was seen to lead to package redundancy, since the number of required different configuration will equate to the number of application packages to be installed. Moreover, in case of further configurations of an application, this approach requires a package to be re-installed on another VA. A better approach is the configuration post installation. In this approach, an application configuration file is extracted from inside a VA and configured by the tool, only to be merged with the VA in the end of the configuration process. Although this approach requires knowledge of the application location, it allows for easy configuration of any number of virtual ap- pliances and, additionally, it does not force an application to be reinstalled in case of a reconfiguration. The Smart Application Reconfiguration Tool (SmART) is the contribution of this thesis for the automatic configuration of applications problem. It processes the configuration files of the applications, applying a series a transformations on each file with the aim of abstracting them from their original formats and eventually converting them back to their formats. One way to deal with the problem is to take advantage of the patterns oftenly found in configuration files. A study conducted on the applications most likely to be encountered by the tool showed that the configuration files resort only to the concepts of parameter setting, parameter block and comment, whereas other patterns occur in a punctual way. After the development phase had ceased, the tool was submitted to some tests so as to val- idate it. SmART was found to meet all the requirements identified in the requirement analysis phase. Then, the configuration of some applications was detailed. It shows the intermediate states of the configuration file and, in the end, the configuration file reproduced by the tool is shown to be functional. With the concept proved and having developed a functional prototype, the integration of the SmART tool with the VIRTU tool proceeded. This process is intended to provide VIRTU with the ability to automatically configure applications, regardless of their vendors. To com- plement this dissertation with reliable information about VIRTU, we spent two weeks with the Evolve team. The integrational process only started on the final term of the elaboration of the dissertation. Therefore, we can only offer a suggestion of how to execute the integration process, meanwhile identifying the possible obstacles that might occur. 7.1 Future Work Initially, the tool was thought to implement a graphical interface for the grammar definition process to become more natural to the user. However, in the end there was not enough time to study a graphical framework and, therefore, this feature was not implemented, although the current implementation allows the user to define a grammar. Nevertheless, this dissertation explains in detail what utilities the interface must offer, and how they can be accomplished. Another suggestion for a future improvement on the tool is for it to infer the meanings of 80
7. CONCLUSION AND FUTURE WORK 7.1. Future Work different patterns in new configuration file languages on its own, using grammar inference. Grammar inference [Hon], also known as automata induction, grammar induction and automatic language acquisition, is a field of research with the purpose of learning grammars and languages from data. It can be applied on the fields of syntatic pattern recognition, adaptative intelligent agents, diagnosis, computational biology, systems modelling, prediction, natural language acquisition, data mining and knowledge discovery. According to [PH01], it is possible to learn grammars from simple examples, like sparse configuration files. There is active work on this subject, namely the GenParse project, which is a collaboration among the University of Alabama-Birmingham, U.S.A. and the University of Maribor, Slove- nia. It aims at easing the development of Domain-Specific Languages and also at developing renovation tools for legacy systems. It makes use of the Genetic Programming paradigm to infer Context-Free Grammars. 81
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Universidade Nova de Lisboa Faculda
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To my family and friends, who suppo
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Sumário Entre os sectores de tecno
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CONTENTS 3.5 Modifying the Configur
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List of Figures 2.1 Virtual applian
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List of Listings 1.1 Apache configu
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1 Introduction This dissertation pr
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1. INTRODUCTION 1.2. Problem Descri
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2. STATE OF THE ART AND RELATED WOR
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3 An application reconfiguration fr
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3. AN APPLICATION RECONFIGURATION F
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Bibliography [Ama09] Amazon. Amazon
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BIBLIOGRAPHY [Sol09a] Evolve Space
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Dissertaç ˜ao de Mestrado Mestrado em Engenharia Informática Jo ...

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