potato2003

$ echo HOST1 HOST2 | xargs -d ' ' -P2 -I{} ssh {} 'tail -F LOG_PATH | xargs -L 1 echo $(hostname): $1'

potato2003

                                               user     system      total        real
String#scan                                1.774321   0.007220   1.781541 (  1.799350)
String.unpack                              0.665138   0.003861   0.668999 (  0.678201)
String#chars.each_slice.map(join)         10.444911   0.023717  10.468628 ( 10.521092)
String#[] slice with times iteration       2.244066   0.006614   2.250680 (  2.264310)
String#slice with times iteration          2.271120   0.005431   2.276551 (  2.290473)

potato2003

systemd

特徴

cgroups による管理

従来の Upstart/daemontools 等の init系プロセスでは、

• double forking による自身を デーモン化するプロセス
• Puma/Unicorn 等の Hot restart

potato2003

#!/usr/bin/env ruby

# usage: setusergroups [-h|--help] username child
#
# setuidgid w. support for supplementary groups
# ruby porting of https://gist.github.com/kazuho/6181648
#
# see: http://d.hatena.ne.jp/hirose31/20130808/1375965331
# see: https://gist.github.com/kazuho/6181648

potato2003

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

public class Main {

    public static void main(String[] args) {
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy年MM月dd日 E曜日", Locale.JAPAN);
        Date now = new Date();

potato2003

#!/bin/bash

if [[ -z "${PACKAGE}" ]]; then
    echo "error: PACKAGE is not assagined."
    echo "  usage) export PACKAGE=com.example; $(basename ${0})"
    exit 1
fi

while :
do

potato2003

class ClassA(val label: String)

implicit val arg1:ClassA = new ClassA("ぼくは暗黙的パラメータ") // implicit def foo のための暗黙的パラメータ定義

implicit def foo(implicit a: ClassA):String = { // 引数の implicit 消すと 暗黙的パラメータ見つからないってエラーになる
  println("fooだよ")
  a.label
}

def bar()(implicit argStr:String):String = {

potato2003

implicit def session(implicit request: RequestHeader) = request.session

potato2003

$ scaladoc -d doc/ -s src/main/scala/**/*.scala

potato2003

trait SlickDBSessionElement extends StackableController {
  self: Controller =>

  import play.api.db.slick
  type Session = slick.Session

  case object DBSessionKey extends RequestAttributeKey[Session]

  override def proceed[A](req: RequestWithAttributes[A])(f: RequestWithAttributes[A] => Result): Result = {
    val session:Session = play.api.db.slick.DB.createSession()