alexandreaquiles

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alexandreaquiles

• 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

• 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

(defn square [x]
  (* x x))

(defn average [x y]
  (/ (+ x y) 2))

(defn improve [guess x]
  (average guess (/ x guess)))

(defn abs [x]

alexandreaquiles

(ns estoque.desconto)

;Good Practices

;split code into smaller pieces
; reuse
; compose
;readability

;PREDICATE - it returns true or false

alexandreaquiles

public enum FormatoLivro {
  PDF,
  EPUB;
}

alexandreaquiles

public class CalculadoraDePrecos {

	public static BigDecimal calcula(Sessao sessao, Integer quantidade) {
		return sessao.calcula(quantidade);
	}

}

alexandreaquiles

package br.com.paradizo.tema;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.file.FileSystem;
import java.nio.file.FileSystemAlreadyExistsException;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;

alexandreaquiles

public class FileUtils {

	public static String getResourceContents(String resource) throws URISyntaxException, IOException {
		Path resourcePath = getResourceAsPath(resource);
		return getPathContents(resourcePath);
	}

	private static Path getResourceAsPath(String resource) throws URISyntaxException, IOException {
		URI uri = FileUtils.class.getResource(resource).toURI();

alexandreaquiles

@Configuration
public class JacksonConfig {

  @Bean
  public ObjectMapper objectMapper() {
    ObjectMapper mapper = new ObjectMapper();
    mapper.setVisibility(PropertyAccessor.GETTER, Visibility.NONE);
    mapper.setVisibility(PropertyAccessor.SETTER, Visibility.NONE);
    mapper.setVisibility(PropertyAccessor.CREATOR, Visibility.NONE);
    mapper.setVisibility(PropertyAccessor.FIELD, Visibility.ANY);