Červnové setkání Pražské Czech Java User Group proběhne 8.6. od 19h v posluchárně S5 na Matematicko-fyzikální fakultě Karlovy Univerzity na Malostranském náměstí 25, Praha 1. Čekají nás dvě prezentace v angličtině na téma Hystrix – managing failures in distributed systems (Tomasz Nurkiewicz) a Microservices at 4financeIT ( Marcin Grzejszczak). Součástí setkání je i občerstvení, které zajišťuje firma 4Finance. Vstup na akce CZJUGu je zdarma, a není třeba se předem registrovat. Pokud se chystáte přijít, dejte nám vědět formou hlasování v anketě na hlavní stránce portálu java.cz.

Hystrix – managing failures in distributed systems

We live in a distributed world where integration between components is ubiquitous. Assuming all parts of the system are working at the same time and are not overloaded is too optimistic. Our application must be prepared for failures, must tolerate, handle and test exceptional conditions.

Hystrix is a library that provides complete set of tools for managing failures. It monitors potentially problematic sections of code (like network calls), measures execution time and error rate. It can pro-actively turn off malfunctioning features for a period of time and keep system resources bound. Built-in real-time monitoring is also really useful to quickly troubleshoot anomalies and bottlenecks.

During this session we will focus on live demos and code samples, no slides are planned. Real-life use cases and proven setups will be covered.

Tomasz Nurkiewicz

Spent half of his life on programming, for the last 8 years professionally in Java land. Loves back-end, tolerates JavaScript. Passionate about alternative JVM languages. Disappointed with the quality of software written these days (so often by himself!), hates long methods and hidden side effects. Interested in charting, data analysis and reporting. Believes that computers were invented so that developers can automate boring and repetitive tasks. Also their own. On a daily basis works in financial sector. Involved in open-source, DZone’s Most Valuable Blogger (http://nurkiewicz.com), used to be very active on StackOverflow. Likes programming. Claims that code not tested automatically is not a feature but just a rumour.

Microservices at 4financeIT

Currently in the world of IT there is a hype for microservices. By many people understood as: "I'm going to set up a couple of repositories and then I'll have microservice architecture". Today's presentation will show you why it's not true and that this architecture involves a lot of work to be done from the infrastructure perspective. I'll show you the problems that we had to face and how we tackled them at 4financeIT. I'll show you also how we've managed to minimize the time needed to set up a new microservice. Apart from that I'll describe what service discovery is, how to gather metrics from your applications and how to aggregate logs in a distributed system.

Marcin Grzejszczak

Software Architect at 4financeIT. Author of "Mockito Instant" and "Mockito Cookbook" books. Co-author of the Groovy @Builder AST transformation in Groovy core and "micro-infra-spring" library for microservices. Author of Uptodate Gradle plugin, Spock subjects-collaborators extension and Gradle test profiler open source projects. Co-founder of the Warsaw Groovy User Group and frequent microservice hackathon organizer.