Este trabalho de mestrado propõe uma plataforma para o desenvolvimento e a execução de aplicações distribuídas em grids computacionais. Tal plataforma visa simplificar o desenvolvimento dessas aplicações, ao mesmo tempo em que as torna capazes de usar recursos compartilhados em um grid. No esquema proposto, o ambiente de desenvolvimento do grid tem estreito relacionamento com o próprio grid, na medida em que o grid distribui a execução dos programas gerados pelo ambiente de desenvolvimento de forma automática. Além de definir a forma de desenvolver as aplicações, o presente trabalho de mestrado também propõe uma infra-estrutura para grids composta por um sistema de troca de mensagens, um escalonador baseado na teoria fuzzy e um mecanismo simples de persistência distribuída. / This thesis proposes a platform for computational grids distributed applications development and execution. The purpose of this platform is to simplify the development of such applications while delivering access to shared resources in a grid environment. In the proposed schema, the grid development environment has a close link with the grid itself as the grid distributes the execution of programs created by the development environment in an automated fashion. Besides presenting a way to develop applications, this thesis also proposes a grid infrastructure composed by a message system, a job scheduler based on fuzzy theory and a simple mechanism of distributed persistence.

Este trabalho de mestrado propõe uma plataforma para o desenvolvimento e a execução de aplicações distribuídas em grids computacionais. Tal plataforma visa simplificar o desenvolvimento dessas aplicações, ao mesmo tempo em que as torna capazes de usar recursos compartilhados em um grid. No esquema proposto, o ambiente de desenvolvimento do grid tem estreito relacionamento com o próprio grid, na medida em que o grid distribui a execução dos programas gerados pelo ambiente de desenvolvimento de forma automática. Além de definir a forma de desenvolver as aplicações, o presente trabalho de mestrado também propõe uma infra-estrutura para grids composta por um sistema de troca de mensagens, um escalonador baseado na teoria fuzzy e um mecanismo simples de persistência distribuída. / This thesis proposes a platform for computational grids distributed applications development and execution. The purpose of this platform is to simplify the development of such applications while delivering access to shared resources in a grid environment. In the proposed schema, the grid development environment has a close link with the grid itself as the grid distributes the execution of programs created by the development environment in an automated fashion. Besides presenting a way to develop applications, this thesis also proposes a grid infrastructure composed by a message system, a job scheduler based on fuzzy theory and a simple mechanism of distributed persistence.

Microservices is one of the most commonly used buzzword of the systems architecture industry and is being adopted by several of the world’s largest technology companies such as Netflix, Uber and Amazon. The architecture which embraces splitting up your system in smaller independent units is an extension of the service-oriented architecture and an opponent of the monolithic architecture. Being a top buzzword and promises of extreme scalability has spiked the interest for microservices, but unlike the relatively simple monolithic architecture the complexity of microservices creates a new set of obstacles. This work sheds a light on these issues and implements solutions for some of the most frequent problems using a case study. The study shows that while microservices can help reduce the inner complexity of a system, it greatly increases the outer complexity and creates the need for a variety of tools aimed at distributed systems. It also concludes that communication and data storage are two of the most frequently occurring issues when developing microservices with the most difficult one being how you reason with and structure your data, especially for efficient queries across microservices. / Microservices eller så kallade mikrotjänster är ett ofta förekommande buzzword inom systemarkitektur och nyttjas av flera teknikjättar som exempelvis Netflix, Uber och Amazon. Arkitekturen som bygger på att dela upp sina system i mindre oberoende delar är en utbyggnad av den tjänstorienterade arkitekturen och numera motståndare till den klassiska monolitiska arkitekturen. En plats högt upp på trendlistan och lovord om extrem skalbarhet har gjort att intresset för mikrotjänster är enormt, men till skillnad från den relativt simpla monolitiska arkitekturen skapar komplexiteten hos mikrostjänster en rad nya hinder. Det här arbetet belyser dessa hinder och implementerar även lösningar för de vanligaste förekommande problemen med hjälp av en fallstudie. Resultatet visar att även fast en mikrotjänstarkitektur kan minska systemets interna komplexitet så leder det till en markant ökning av systemets yttre komplexitet och det skapas ytterligare behov av en mängd olika verktyg och tjänster designade för distribuerade system. Studien visar också att de två mest förekommande problemen vid utveckling av en mikrotjänstarkitektur är kommunikation och datalagring där hantering och struktur av data är den mest komplicerade och kräver mycket kunskap, speciellt för att skapa effektiva datasökningar som sträcker sig över flera mikrotjänster.