joaop21 / onlinesupermarket

Fault Tolerance Project

OnlineSuperMarket

Fault Tolerance Project

Replicated Online SuperMarket made for Fault Tolerance class.

This project was implemented using Java and Spread toolkit, thus practicing group communication, software replication techniques and ensure some consistency criteria.

Informally, the system can be described as similar to a cart system, which is replicated among servers, and after some server failure the system should recover it, sending the database operations that were missed and the timers to clean some old carts (physical time problem). Find out more in the Report

This project was carried out in the second semester of the fourth year of informatics engineering course at University of Minho. [2019-2020]

Wiki

• System Architecture
• Database Architecture

Contributors

João Silva	Henrique Pereira	Miguel Carvalho
github.com/joaop21	github.com/hpereira98	github.com/MAACarvalho

onlinesupermarket's Issues

Needs recuperation when failure occured

Fazer com manipulação de ficheiros.

Client Middleware for Server Interaction

Server Middleware - Gateway for client connections

Client Middleware for Load Balancing (Driver)

Database - Modularity

Communication - Defining ProtocolBuffers

Database - Cart logic

Server Middleware - Spread communication

Database - Search Items

Database - Initial database population

Load Balancers - Leader Election

SocketIO error when reading from a close socket

Add Logger

Logger instead of System.out.println.

Communication - Client-Server Protocol

Client - Simple Interface

Spread - Middleware

Application - Skeletons

Create skeletons for the existing classes, as JOP suggested at the beginning.

Database - Change stock value (Operation, Set)

• Change stock value (Operation, Set)

Communication - Server-Server Protocol

Load Balancers - Server election

Add Benchmarking

Communication - Client-LoadBalancer Protocol

Application - TMAX orders

Application - Business Logic

• Order
• Item
• OrderLine?
• Customer?

Client Interface

Perhaps a logout feature would be nice.

Client - Stubs

Create stubs for the existing classes, as JOP suggested at the beginning.

Server Middleware - Operation treatment