dalegaspi

import com.typesafe.scalalogging.StrictLogging
import monix.eval.Task
import monix.execution.Scheduler

import scala.concurrent.Future

object Stopwatch extends StrictLogging {

  /**
    * http://biercoff.com/easily-measuring-code-execution-time-in-scala/

dalegaspi

import java.io.{ByteArrayInputStream, ByteArrayOutputStream, ObjectInputStream, ObjectOutputStream}
import java.util.zip.{GZIPInputStream, GZIPOutputStream}
import scala.util.Try

/**
  * aped from https://gist.github.com/owainlewis/1e7d1e68a6818ee4d50e (gzip compression)
  * and from https://stackoverflow.com/a/39371571/918858 (ser/deser from Array[Byte])
  */
object Gzip {

dalegaspi

Homebrew and Symlink Issues

if you see this:

Error: An unexpected error occurred during the `brew link` step
The formula built, but is not symlinked into /usr/local
Permission denied @ dir_s_mkdir - /usr/local/Frameworks
Error: Permission denied @ dir_s_mkdir - /usr/local/Frameworks

dalegaspi

package com.tormund

import java.util
import java.util.concurrent.TimeUnit

import com.codahale.metrics._
import com.typesafe.scalalogging.StrictLogging
import org.json4s.DefaultFormats

/**

dalegaspi

// for use with your build.sbt

object Dependencies {
  // ... all your other dependencies
  
  val typesafeSlick = "com.typesafe.slick" %% "slick" % "3.1.1"
  val postgreSql = "org.postgresql" % "postgresql" % "9.4.1209"
  val hikariCP = "com.typesafe.slick" %% "slick-hikaricp" % "3.1.0" // you need really need this or you get ClassNotFoundException
}

dalegaspi

tail -f reporting.log | grep --line-buffered "INFO S3RecordFetcher - 20160119/" | cut -c23-64 | stdbuf -oL uniq | ts

dalegaspi

ResourceConfig rc = new ResourceConfig().packages(...)
  .register(...);
  
// this is to enable JMX...or any init parameters for that matter
rc.addProperties(ImmutableMap.of("jersey.config.server.monitoring.statistics.mbeans.enabled", "true"));

dalegaspi

• Use Java 8. Seriously, any other version is just backwards-thinking. Functional aspects of the new version is reason enough to use it.
• Use Jersey REST Framework. I've tried every other framework out there (including the bloated, over-engineered Play Framework) and nothing comes close to its efficiency and features without being bloated.
• Never use parallelStream()...at least in the current release of Java 8 as it has the most inane implementation of parallelism I have come across to date.
• On that note, never spawn threads at all within a request. If your request is taking too long using a single thread, you're doing it wrong.
• Use a profiler. Buy a YourKit license now.
• Be mindful of your logging. For example, if you're using Log4J2 asynchronous loggers, don't use includeLocation=true.
• If you need a simple in-memory, non-distributed caching, use Google Guava Caching libraries. For Pete's sake, don't roll your own using ConcurrentHashMap; life is too short for that.
• Need pooling objects

dalegaspi

java -cp chronicle-logger-tools-1.1.1.jar:chronicle-logger-1.1.1.jar:chronicle-3.5.3.jar:lang-6.6.7.jar net.openhft.chronicle.logger.tools.ChroniTail -t -u /opt/tomcat/logs/chronicle/main

dalegaspi

Introduction

There is very little information on the internet on how to send broadcast UDP messages in Java, which is kind of surprising since UDP broadcast is the simplest way to do broadcast messages without having to write a lot of code and or put in a lot of moving pieces, so long as one is aware of the drawbacks. I found myself having to search for this information and even Oracle's own documentation on this is just mediocre at best. Fortunately, someone took the time to write down. This is just a mirror of that information on GitHub to make it easier to find for someone searching for the same information.

The Sender

1. Import some needed classes

import sun.net.*;
import java.net.*;

2. Declare the port we send to