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macOS Internals

Understand your Mac and iPhone more deeply by tracing the evolution of Mac OS X from prelease to Swift. John Siracusa delivers the details.

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Install Arch Linux in VirtualBox

Quick install guide for Arch -- if you're looking for an automated installer, consider Arch Anywhere.

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Download the latest version from: https://www.archlinux.org/download/

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**/
 
const int c = 261;
const int d = 294;
const int e = 329;
const int f = 349;
const int g = 391;
const int gS = 415;
const int a = 440;
const int aS = 455;

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A state machine is defined as follows:

• Input - a set of inputs
• Output - a set of outputs
• State - a set of states
• S0 ∈ S - an initial state
• T : Input * State -> Output * State - a transition function

If you model your services (aggregates, projections, process managers, sagas, whatever) as state machines, one issue to address is management of State. There must be a mechanism to provide State to the state machine, and to persist resulting State for subsequent retrieval. One way to address this is by storing State is a key-value store. Another way is to use a SQL database. Yet another way is event sourcing. The benefit of even sourcing is that you never need to store State itself. Instead, you rely on the Output of a service to reconstitute state. In order to do that, the state machine transition function needs to be factored into two functions as follows:

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public interface IPublisherEvents
{
  void OnPublished(object value);
}

public interface IPublisher : IActor, IActorEventPublisher<IPublisherEvents>
{
  Task PublishAsync(object value);
}

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/*
 * Copyright (C) 2014 Chris Banes
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <dk.ostebaronen.droid.viewpagerindicator.TitlePageIndicator 
    android:id="@+id/viewPagerIndicator"
    android:padding="10dip"

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <dk.ostebaronen.droid.viewpagerindicator.TitlePageIndicator 
    android:id="@+id/viewPagerIndicator"
    android:padding="10dip"

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  <Grid x:Name="LayoutRoot" Width="37" Height="42" Visibility="Collapsed" Opacity="0">
    <VisualStateManager.VisualStateGroups>
      <VisualStateGroup>
        <VisualState x:Name="DefaultState">
          <Storyboard>
            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="LayoutRoot" Storyboard.TargetProperty="Visibility"
              BeginTime="0:0:0.2">
              <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="Collapsed"/>
            </ObjectAnimationUsingKeyFrames>
            <DoubleAnimation Storyboard.TargetName="LayoutRoot" Storyboard.TargetProperty="Opacity"

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namespace BenjiiMe.Animation
{
    public class ContinuumTransition : TransitionElement
    {
        public const string ContinuumElementPropertyName = "ContinuumElement";
        public const string ContinuumModePropertyName = "Mode";

        public FrameworkElement ContinuumElement
        {
            get { return (FrameworkElement)GetValue(ContinuumElementProperty); }