darekmydlarz

public class Benchmarks {
    private static int LOOPS = 1_000;

    @Benchmark
    @Fork(value = 1, warmups = 2)
    @GroupThreads(100)
    public void atomicLong(Counters counters, Blackhole blackhole) {
        for (int i = 0; i < LOOPS; ++i) {
            blackhole.consume(counters.atomicCounter.incrementAndGet());
        }

darekmydlarz

How to read Kafka Consumer Group Offset

• Install Kafka Tools in a specific version - e.g. Scala 2.12, Version 1.1.0 - link
• List consumer groups, Kafka address: localhost:9092:

bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --list

• List topic offsets for group console-consumer-96905:

darekmydlarz

// before

case class Query(table: String, orderKey: String, whereClause: Option[String] = None) {
  def fetchQuery(): String = {
    Seq(
      s"SELECT * FROM $table",
      whereClause.map(w => s"WHERE $w").getOrElse(""),
      s"ORDER BY $orderKey ASC"
    ).mkString
  }

darekmydlarz

Start MySQL in a docker with volume mounted on the host and initial scripts

${PWD}/docker-entrypoint-initdb.d - contains initial scripts to be loaded on MySql startup

docker run --name mysql-1 \
    -itd -e MYSQL_ROOT_PASSWORD=password  \
    -e MYSQL_DATABASE:affiliate_dev \
    -p 127.0.0.1:3306:3306  \
 -v /Users/darek/docker/docker-entrypoint-initdb.d:/docker-entrypoint-initdb.d mysql:5.7.19

darekmydlarz

Problem

I have entity with jsonb column type.

public class Copy {
    private Long id;

    @Column(columnDefinition = "jsonb")
 private String content;

darekmydlarz

Image image = new RotatedImage( // just a regular declaration
  CLOCKWISE, 
  90,
  new GrayScaledImage(
    new CachedImage(
      "//cdn.google.com/logos/apple.png",
      new RemoteImage("//cdn.google.com/logos/apple.png")
    )
  )
);

darekmydlarz

// procedular programming
@Value
class IdProvider {
    private final String id;
    private final String email;

    // getters
}

darekmydlarz

package com.getbase.services.reach.api.dtos.request;

/**
 * Put quotes around the given String if necessary.
 * <p>
 * If the argument doesn't include spaces or quotes, return it as is. If it
 * contains double quotes, use single quotes - else surround the argument by
 * double quotes.
 * </p>
 * <p>

darekmydlarz

interface Board {
  Board movement(Movement movement);
  Player winner();
}

public static void main() {
  Player black = new Player("Black");
  Player white = new Player("White");
  Board board = new Board(black, white);
  Movement movement = new Movement(black, board).position();

darekmydlarz

import SimpleHTTPServer
import SocketServer
from time import sleep

PORT = 5000
SLEEP_TIME = 6


class SlowHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
    def do_GET(self):