A Proposal of Reference Architecture for the Reconfigurable Software Development Frank José Affonso Department of Statistics, Applied Mathematics and Computation Univ Estadual Paulista - UNESP Rio Claro - SP, Brazil / Evandro Luis Linhari Rodrigues Department of Electrical Engineering University of São Paulo - USP São Carlos - SP, Brazil The 24th International Conference on Software Engineering and Knowledge Engineering (SEKE 2012) July /

Main topics Introduction; Concepts and Definitions; Related Work; A Proposal of Reference Architecture; Conclusions; 2

Introduction Computational systems endowed with runtime reconfiguration characteristics; Ability to incorporate customers’ emerging needs; Reconfigurable software must attend many development approach: Object-Oriented; Aspect-Oriented; Service-Oriented; Remote Method Invocation. 3

Introduction (cont.) The Development of Reconfigurable Software needs: Reconfigurable Software Development Methodology (RSDM); Reconfigurable Execution Environment (REE); Software engineering tool; Architectural models; 4

Concepts and Definitions The Computational Reflection can be defined as any activity performed by a system on itself; The main objective is to obtain information about its own activities, aiming to improve its performance, introduce new capabilities (features or functionality), or even solve its problems by choosing the best procedure. 5

Reflection: Reflections Concepts and Definitions (cont.) HumansSoftware Reflections 6

Related Work According to some authors, the reconfigurable software development is associated: Flexible Architectural Model; Automated Processes; Software Engineering Tools; 7

A Reference Architecture The Reference architecture model for the reconfigurable software development such as automated processes; This model represents a real solution (abstraction), based on a particular domain (reconfigurable systems) and experience (patterns) to treat the runtime software reconfiguration without the developers’ participation. 8

A Reference Architecture (cont.) Reconfiguration like “assembly line”; Uncertainties Process conducted by human 9

A Reference Architecture (cont.) Reconfiguration like “assembly line”; Automated process 10

A Reference Architecture (cont.) Model organized in packages: 11

A Reference Architecture (cont.) The annotations module aims to assist the software engineer in the definition of artifacts reconfiguration level which are being developed: Metadata (annotation) indicating the reconfiguration level supported by the artifact must be present; It is recommended that this module has a functionality to verify if the annotations were inserted correctly. 12

A Reference Architecture (cont.) The state management module aims to preserve the artifacts execution state; When a software artifact is selected for manual or automatic reconfiguration, the information contained in its current state must be preserved. 13

A Reference Architecture (cont.) The reflection module aims to perform the artifacts "disassembly" to obtain structural information (attributes) and behavior (methods): The artifacts are disassembled; A metamodel is instantiated; New information, according to the clients' interests, are added to create a new metamodel; The new metamodel is transferred to the source code generator module to create the new artifact. 14

A Reference Architecture (cont.) The source code generator module aims to generate the software artifacts based on metamodel (instantiated in reflection module); To execute this operation, the software engineer must provide: An artifact template based on the architectural pattern (logical layer, persistence layer, and others); 15

A Reference Architecture (cont.) The query and rules module aims to be consulted by software artifacts in REE repositories; When an artifact is developed and inserted into the REE, an automatic mechanism rulesFactory is responsible for disassembling this artifact and creating rules set that describes the artifact functionalities. These rules are stored in REE repositories and reused when a search is performed. 16

A Reference Architecture (cont.) The configuration module aims to control the size of software artifacts when the reconfiguration is performed; The artifacts are developed to meet specific requirements and to act in a specific domain; This module allows performing the growth control in the artifacts size and a number of adaptations. 17

A Reference Architecture (cont.) The reconfiguration module can be considered the "orchestrator" of the model, since it performs call and coordinates all the activities of the other modules; This module must implement a "connection point" as a system supervisor (reconfigurator package) between the dynamic compiler (dynamicCompiler package) and dynamic classloader (dynamicClassLoader package); The module functionalities aim to compile/recompile the artifacts software and upload its binary code in runtime (memory). 18

Conclusions This work presented a proposal for reference architecture model for the reconfigurable systems development using automated processes; Standardization should be adopted in the design and development of reconfigurable systems; Reusability of the reference architectural model and creation of concrete architecture model for reconfigurable software development. 19

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