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title
Elements of Messaging and Eventing Platforms

This document provides a brief overview of the essential elements of a messaging and eventing platform and how they relate to each other.

Message and Event Broker Categories

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import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.PostConstruct;
import java.util.Optional;
import java.util.concurrent.TimeUnit;

@Component
public class CacheStore {

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Conhecendo e setando parâmetros da JVM

Material de suporte rápido para conhecer e setar parâmetros de JVM mais comuns relacionados a propriedades da JVM, configuração de frameworks e libs, aplicação e tuning de memória heap e metaspace, além da definição do algoritimo de GC e algumas configurações para troubleshooting.

Introdução

Todos os comandos aqui são executados via linha de comando, mas podem ser definidos na sua IDE, variável de ambiente (JAVA_OPTS) ou no seu servidor de integração contínua (CI).

Rodando uma aplicação (jar):

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import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.dao.DataAccessException;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.context.request.WebRequest;
import java.time.LocalDateTime;
import java.util.Map;

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Modern Unix: ferramentas de linha de comando uteis

https://github.com/ibraheemdev/modern-unix

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@Entity
class Proposal(
    val name: String,
    //
    @Column(columnDefinition = "binary(16)") // this works but uses a MySQL's specific type
    val customerId: UUID
) {

    @Id
    @GeneratedValue

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Material de estudos sobre troubleshooting

Conteúdo sobre troubleshooting em geral

• Web Application Performance: 7 Common Problems and How to Solve Them
• Wizard Zines: Linux Debugging Tools
• Wizard Zines: Mysteries (idéia bacana e didáticas)
• Linux Performance Analysis in 60,000 Milliseconds
• Tweet: O Code Complete 2 tem um capítulo sobre debugging...
• Como a ciência pode te ajudar a resolver bugs
• Performance Analysis Methodology

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• vídeo no Youtube com explicação;
• repositório no Github com detalhes da instalação

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[wsl2]
memory=4GB
swap=16GB
localhostFowarding=true

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Gloogle Cloud: Rate-limiting strategies and techniques

Sever-side

• Even in the cases where the rate limiting is implemented entirely on the server side, the client should be engineered to react appropriately.
• Decisions about failing open or failing closed are mostly relevant on the server side, but knowledge of what retry techniques the clients use on a failed request might influence your decisions made about server behavior.
• In HTTP services, the most common way that services signal that they are applying rate limiting is by returning a 429 status code in the HTTP response. A 429 response can provide additional details about why the limit is applied (for example, a freemium user has a lower quota, or the system is undergoing maintenance).
• Build your system with robust error handling in case some part of your rate-limiting strategy fails, and understand what users of your service will receive in those situations. [...] U