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@alexandreaquiles
alexandreaquiles / eval.clj
Created July 18, 2020 20:52
Trying a Clojure version of Paul Graham's The Roots of Lisp: http://www.paulgraham.com/rootsoflisp.html
(defn eval* [e a]
(defn atom* [x]
(or (= x '()) (not (seq? x))))
(defn null* [x]
(= x '()))
(defn and* [x y]
(cond x
(cond y true
:default false)
:default false))
@alexandreaquiles
alexandreaquiles / Kafka.drawio
Last active March 28, 2024 18:36
draw.io Kafka Diagram (open it in https://draw.io)
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@alexandreaquiles
alexandreaquiles / todo.md
Last active June 2, 2020 21:58
Kafka Consumer Groups, Offsets and Partitions
  • Create a topic with 3 partitions: bin/kafka-topics.sh --bootstrap-server localhost:9092 --create --topic TEST --partitions 3
  • Alter the number of partitions of an existing topic to 3: bin/kafka-topics.sh --bootstrap-server localhost:9092 --alter --topic BOOK_ORDERS --partitions 3
  • List consumer groups: bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --list
  • Describe consumers groups and its partitions and offsets: bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --describe --group EbookGeneratorService
  • Describe partitions and offsets of all consumer groups: bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --describe --all-groups
@alexandreaquiles
alexandreaquiles / todo.md
Created June 1, 2020 19:46
Kafka Exercise
  • Install Kafka
  • Change config/zookeeper.properties and config/server.properties to use non-temporary folders
  • Run Zookeeper: bin/zookeeper-server-start.sh config/zookeeper.properties
  • Run Kafka: bin/kafka-server-start.sh config/server.properties
  • Produce some records to the ebooks topic: bin/kafka-console-producer.sh --bootstrap-server localhost:9092 --topic ebooks
  • Consume the ebooks topic from the beginning: bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic ebooks --from-beginning
  • List the topics bin/kafka-topics.sh --bootstrap-server localhost:9092 --list
  • Describe the ebooks topic: bin/kafka-topics.sh --bootstrap-server localhost:9092 --describe --topic ebooks
@alexandreaquiles
alexandreaquiles / sqrt.clj
Created May 30, 2020 15:11
Square Implementation from SICP
(defn square [x]
(* x x))
(defn average [x y]
(/ (+ x y) 2))
(defn improve [guess x]
(average guess (/ x guess)))
(defn abs [x]
@alexandreaquiles
alexandreaquiles / estoque.clj
Created May 19, 2020 19:23
High Order Functions
(ns estoque.desconto)
;Good Practices
;split code into smaller pieces
; reuse
; compose
;readability
;PREDICATE - it returns true or false
public enum FormatoLivro {
PDF,
EPUB;
}
@alexandreaquiles
alexandreaquiles / CalculadoraDePrecos.java
Created July 4, 2018 19:38
Solução sugerida para exercício de Refatoração do PM-87.
public class CalculadoraDePrecos {
public static BigDecimal calcula(Sessao sessao, Integer quantidade) {
return sessao.calcula(quantidade);
}
}