sjednac’s gists

sjednac / SbtAmazonEcr.scala

Last active July 4, 2021 07:12

Pushing Docker images to Amazon ECR using an SBT plugin

	object SbtAmazonEcr extends App {
	while(true) {
	println("Hello Docker.")
	Thread.sleep(3000)
	}
	}

sjednac / BusyApp.java

Last active May 11, 2021 07:03

JVM monitoring in a Docker environment

	public final class BusyApp {
	public static void main(String []args) throws Exception {
	final java.util.Random generator = new java.util.Random();
	while (true) {
	generator.ints(1000000, 0, 100).sorted();
	Thread.sleep(5000L);
	}
	}
	}

sjednac / TimeSeries.scala

Last active June 4, 2018 14:32

Computing local information within a rolling time window in Scala

	import scala.io.Source

	case class Observation(time: Int, value: BigDecimal)

	class Memory(val length: Int, val observation: Option[Observation], val pastEvents: List[Observation]) {

	def record(newObservation: Observation): Memory = {
	val newEvents = (newObservation :: pastEvents).takeWhile(_.time > newObservation.time - length)
	new Memory(length, Some(newObservation), newEvents)
	}

sjednac / ZooKeeperReader.scala

Last active September 25, 2015 19:58

A minimal property reader for Apache ZooKeeper

	import java.time._
	import org.apache.curator.framework._
	import org.apache.curator.retry._
	import org.apache.zookeeper.CreateMode._

	object ZooKeeperReader extends App {
	val connectionString = "192.168.59.201:2181,192.168.59.202:2181,192.168.59.203:2181,192.168.59.204:2181,192.168.59.205:2181"
	val retryPolicy = new RetryOneTime(1000)
	val client = CuratorFrameworkFactory.newClient(connectionString, retryPolicy)

sjednac / SpringAndSeleniumScalaTest.scala

Created May 28, 2015 22:32

A Selenium test run with ScalaTest on a Spring Boot application.

	import org.junit.runner.RunWith
	import org.scalatest.selenium.HtmlUnit
	import org.scalatest.{FlatSpec, ShouldMatchers}
	import org.springframework.boot.test.{SpringApplicationConfiguration, WebIntegrationTest}
	import org.springframework.test.context.TestContextManager
	import org.springframework.test.context.junit4.SpringJUnit4ClassRunner

	@RunWith(classOf[SpringJUnit4ClassRunner])
	@SpringApplicationConfiguration(classes = Array(classOf[Application]))
	@WebIntegrationTest(value = Array("server.port=9000"))

sjednac / UnboundedKnapsackDP.java

Last active June 4, 2017 06:01

Unbounded knapsack solver using dynamic programming approach.

	import java.math.BigInteger;
	import java.text.MessageFormat;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.Collection;
	import java.util.Collections;
	import java.util.List;
	import java.util.Scanner;
	import java.util.function.BiFunction;
	import java.util.stream.Collectors;

sjednac / OptionalSpringBeanInjection.scala

Created December 29, 2014 16:57

Optional Spring bean injection using a @Profile

	import collection.JavaConversions._
	import org.springframework.beans.factory.annotation._
	import org.springframework.context.ApplicationContext
	import org.springframework.context.annotation._
	import org.springframework.stereotype._

	package com.example.core {

	@ComponentScan(basePackages = Array("com.example.core"))
	@Configuration

sjednac / SimpleScalatraRestService.scala

Created December 8, 2014 18:31

A simple Scalatra REST service launched with Jetty

	import javax.servlet.ServletContext
	import org.eclipse.jetty.server.Server
	import org.eclipse.jetty.webapp.WebAppContext
	import org.json4s.{DefaultFormats, Formats}
	import org.scalatra._
	import org.scalatra.json._
	import org.scalatra.servlet.ScalatraListener

	case class User(id: Int, name: String)

sjednac / Log4j2WithMongoAppenderDemo.scala

Last active August 29, 2015 14:09

Log4j 2.x with MongoDB & SLF4J

	object Log4j2WithMongoAppenderDemo extends App {
	val logger = org.slf4j.LoggerFactory.getLogger(Log4j2WithMongoAppenderDemo.getClass)

	logger.trace("A trace message")
	logger.debug("A debug message")
	logger.info("An info message")
	logger.warn("A warning message")
	logger.error("An error message")
	logger.error("An error message with an exception", new Exception("Some serious problem"))

sjednac / RaptureIORedditReader.scala

Last active August 29, 2015 14:07

An example Rapture IO client for a RESTful web service.

	import rapture._
	import core._, io._, net._, uri._, json._, codec._

	import encodings.`UTF-8`
	import jsonBackends.jackson._

	case class PostContainer(kind: String, data: Post)
	case class Post(id: String, subreddit: String, score: Int, title: String, author: String, permalink: String) {
	lazy val topComment = {
	val json = Json.parse(uri"http://www.reddit.com/r/${subreddit}/comments/${id}.json?sort=top&limit=1&depth=1".slurp[Char])

Szymon Jednac sjednac