george-hawkins

package week2

import java.util.Arrays

import common.ParallelConstructs._

import scala.util.Random
import org.scalameter._

object ParallelMergeSortLecture extends App {

george-hawkins

package week2

object Lecture6 extends App {
  def reduceSeg1[A](inp: Array[A], left: Int, right: Int, a0: A, f: (A, A) => A): A = {
    var a = a0
    var i = left
    while (i < right) {
      a = f(a, inp(i))
      i += 1
    }

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sealed trait Conc[+T] {
  def level: Int
  def size: Int
  def left: Conc[T] = throw new NoSuchElementException("no left subtree")
  def right: Conc[T] = throw new NoSuchElementException("no right subtree")

  def <>[U >: T](that: Conc[U]): Conc[U] = {
    if (this == Empty) that
    else if (that == Empty) this
    else concat(this, that)

george-hawkins

QEMU arm64 cloud server emulation

This is basically a rehash of an original post on CNXSoft - all credit (particularly for the Virtio device arguments used below) belongs to the author of that piece.

Download the latest uefi1.img image. E.g. ubuntu-16.04-server-cloudimg-arm64-uefi1.img from https://cloud-images.ubuntu.com/releases/16.04/release/

Download the UEFI firmware image QEMU_EFI.fd from https://releases.linaro.org/components/kernel/uefi-linaro/latest/release/qemu64/

Determine your current username and get your current ssh public key:

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george-hawkins

package com.example;

import java.lang.reflect.Method;
import java.security.Principal;

import org.junit.Assert;
import org.junit.Test;
import org.springframework.core.MethodParameter;
import org.springframework.security.core.Authentication;

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[Unit]
Description=Broadcast triggered shutdown
After=network.target

# To install:
#     $ sudo apt-get install socat
#     $ sudo chown root:root broadcast-shutdown.service
#     $ sudo mv broadcast-shutdown.service /etc/systemd/system
#     $ sudo systemctl daemon-reload
#     $ sudo systemctl enable broadcast-shutdown

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Github-flavored Markdown doesn't support aspect retaining or absolute image dimensions.

Original

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Accessing Okta accounts etc. in Java

If you've already followed the Getting Started With Okta document from Stormpath then you should already have a Spring Boot application where users can login.

However if you try to interogate the system e.g. for all accounts you'll quickly find out that most of the methods provided by Application, such as getAccounts(), throw UnsupportedOperationException.

Another way to get at this data is via the Okta Java SDK.

By default this SDK uses a different mechanism to pickup the Okta API token etc. to the one used by the Okta compatible version of the Stormpath Spring Boot SDK.

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#!/bin/bash

DRIVERS_DIR=/sys/bus/pci/drivers

# George Hawkins Nov 18th, 2014
# I found various scripts that bind and unbind the USB devices to reset the whole USB system.
# All used hardcoded slots and drivers - slots aren't consistent across machines and driver names change with OS releases.
# This script attempts to discover all values.

# This awk script finds all PCI devices with class 'USB controller' that have a slot and a driver.