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Oatmeal
feeds.twtxt.net
 (3y ago)

** Occasional notes **
If they aren’t weekly, I guess they’re occasional?

3rd repair procedure to fix brain bleed was a success. I have a few more scans and follow ups, but, knock wood I think I’m through at this point.

I’ve spent about a week laying low and taking it easy navigating some wild pain, but that is subsiding now. I watched a bunch of stuff. It was a nice change of pace. I don’t typically watch much television or many movies. Stand outs (all things I revisited) include:

  • Michael Clayton
  • Point Break, the o … ⌘ Read more

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Oatmeal
feeds.twtxt.net
 (3y ago)

** week notes **
Am I allowed to call them“week notes” if I don’t do them weekly?

I went in for what was supposed to be my final brain scan, a diagnostic angiogram (don’t look that up). The good news is that the repair has officially cured my brain bleed! The bad news is that they saw another vessel that looks primed to bleed; I’m due for another repair procedure sometime in October. I’m pretty bummed to not be done with this ordeal, but trying to remain optimistic that this new one was caught before it bled and because the surgeon s … ⌘ Read more

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hashtable
feeds.twtxt.net
 (3y ago)

Une presse française lâche et paresseuse
Ah, finalement, qu’il est doux d’être journaliste en France dans un journal de révérence ! Jadis, c’était un travail fatigant, voire stressant et parfois même risqué : il fallait aller chercher l’information directement sur le terrain et la corroborer le carnet de notes à la main. Certains événements pouvaient impliquer de mettre sa vie en danger ; et […] ⌘ Read more

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xuu
txt.sour.is
 (4y ago)
↳ In-reply-to » Progress! so i have moved into working on aggregates. Which are a grouping of events that replayed on an object set the current state of the object. I came up with this little bit of generic wonder.

(cont.)

Just to give some context on some of the components around the code structure.. I wrote this up around an earlier version of aggregate code. This generic bit simplifies things by removing the need of the Crud functions for each aggregate.

Domain Objects

A domain object can be used as an aggregate by adding the event.AggregateRoot struct and finish implementing event.Aggregate. The AggregateRoot implements logic for adding events after they are either Raised by a command or Appended by the eventstore Load or service ApplyFn methods. It also tracks the uncommitted events that are saved using the eventstore Save method.

type User struct {
  Identity string ```json:"identity"`

  CreatedAt time.Time

  event.AggregateRoot
}

// StreamID for the aggregate when stored or loaded from ES.
func (a *User) StreamID() string {
	return "user-" + a.Identity
}
// ApplyEvent to the aggregate state.
func (a *User) ApplyEvent(lis ...event.Event) {
	for _, e := range lis {
		switch e := e.(type) {
		case *UserCreated:
			a.Identity = e.Identity
			a.CreatedAt = e.EventMeta().CreatedDate
        /* ... */
		}
	}
}
Events

Events are applied to the aggregate. They are defined by adding the event.Meta and implementing the getter/setters for event.Event

type UserCreated struct {
	eventMeta event.Meta

	Identity string
}

func (c *UserCreated) EventMeta() (m event.Meta) {
	if c != nil {
		m = c.eventMeta
	}
	return m
}
func (c *UserCreated) SetEventMeta(m event.Meta) {
	if c != nil {
		c.eventMeta = m
	}
}
Reading Events from EventStore

With a domain object that implements the event.Aggregate the event store client can load events and apply them using the Load(ctx, agg) method.

// GetUser populates an user from event store.
func (rw *User) GetUser(ctx context.Context, userID string) (*domain.User, error) {
	user := &domain.User{Identity: userID}

	err := rw.es.Load(ctx, user)
	if err != nil {
		if err != nil {
			if errors.Is(err, eventstore.ErrStreamNotFound) {
				return user, ErrNotFound
			}
			return user, err
		}
		return nil, err
	}
	return user, err
}
OnX Commands

An OnX command will validate the state of the domain object can have the command performed on it. If it can be applied it raises the event using event.Raise() Otherwise it returns an error.

// OnCreate raises an UserCreated event to create the user.
// Note: The handler will check that the user does not already exsist.
func (a *User) OnCreate(identity string) error {
    event.Raise(a, &UserCreated{Identity: identity})
    return nil
}

// OnScored will attempt to score a task.
// If the task is not in a Created state it will fail.
func (a *Task) OnScored(taskID string, score int64, attributes Attributes) error {
	if a.State != TaskStateCreated {
		return fmt.Errorf("task expected created, got %s", a.State)
	}
	event.Raise(a, &TaskScored{TaskID: taskID, Attributes: attributes, Score: score})
	return nil
}
Crud Operations for OnX Commands

The following functions in the aggregate service can be used to perform creation and updating of aggregates. The Update function will ensure the aggregate exists, where the Create is intended for non-existent aggregates. These can probably be combined into one function.

// Create is used when the stream does not yet exist.
func (rw *User) Create(
  ctx context.Context,
  identity string,
  fn func(*domain.User) error,
) (*domain.User, error) {
	session, err := rw.GetUser(ctx, identity)
	if err != nil && !errors.Is(err, ErrNotFound) {
		return nil, err
	}

	if err = fn(session); err != nil {
		return nil, err
	}

	_, err = rw.es.Save(ctx, session)

	return session, err
}

// Update is used when the stream already exists.
func (rw *User) Update(
  ctx context.Context,
  identity string,
  fn func(*domain.User) error,
) (*domain.User, error) {
	session, err := rw.GetUser(ctx, identity)
	if err != nil {
		return nil, err
	}

	if err = fn(session); err != nil {
		return nil, err
	}

	_, err = rw.es.Save(ctx, session)
	return session, err
}

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luke_smiths_blog
feeds.twtxt.net
 (4y ago)

Monerotopia Presentation and Website News
Just a note that within two hours (11AM NY time), my edited Monerotopia presentation with slides and all will be premiering here on the Monero Talk channel on YouTube.

I did already do an extended commentary and explanation of my talk here on my PeerTube channel, and I might put this an the edited talk onto my YouTube channel if I feel like it. You shou … ⌘ Read more

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nixos-news
feeds.twtxt.net
 (4y ago)

Nix 2.8.0 released
We’re pleased to announce the availability of Nix 2.8.0. It will be
available from NixOS -\
Getting Nix / NixOS.

Here are the release notes:

  • New experimental command:nix fmt, which applies a
    formatter defined by the formatter.<system></system> flake
    output to the Nix expressions in a flake.

  • Various Nix commands can now read expressions from standard input
    using--file -.

  • New experimental builtin function
    builtins.fetchClosure that c … ⌘ Read more

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oxplot_blog
feeds.twtxt.net
 (4y ago)

Annotate PDFs on Linux
This post is about a GUI tool called pdfrankestein that
fills a gap on mostly Linux machines where a powerful and easy to use
PDF annotator does not exist.

Adobe Acrobat® on Windows and Mac allow you to add text, drawings and
signatures to PDF documents. This is useful when filling forms or
marking notes to send back to someone. Such a tool with similar
capabilities and easy of use does not exist on Linux. The reason that’s
often cited is that PDF is a c … ⌘ Read more

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docker_blog
feeds.twtxt.net
 (4y ago)

Docker: Nine Years YOUNG
Nine years ago today, March 15, 2013, Solomon Hykes, the founder of Docker, first demoed Docker publicly to the world at PyCon. On stage Solomon noted that, for developers, “shipping to the server is hard,” and thus he and the early team designed Docker to help developers more easily build, share, and run any app, […]

The post Docker: Nine Years YOUNG appeared first on Docker Blog. ⌘ Read more

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nixos-news
feeds.twtxt.net
 (4y ago)

Nix 2.7.0 released
We’re pleased to announce the availability of Nix 2.7.0. It will be
available from
NixOS - Getting Nix / NixOS.

Here are the release notes:

  • Nix will now make some helpful suggestions when you mistype something
    on the command line. For instance, if you type nix build
    nixpkgs#thunderbrd, it will suggest
    thunderbird.

  • A number of “default” flake output attributes have been renamed.
    These are:

    • defaultPackage.<system></system> → packag ... ⌘ [Read more](https://nixos.org/blog/announcements.html#nix-2.7.0)

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Oatmeal
feeds.twtxt.net
 (4y ago)

** 2022-02-24 feature/6.0 Android test plan **

Overview

Will test the upgrade path from a known state to new version to ensure that settings and app state are maintained during upgrade process.

V. 6.0 of libro.fm android app introduces an entirely new local database. This testing is focused on ensuring that local data remains intact between versions.

Notes

This evening I was mostly focused on setting up a successful build of feature/6.0 on my test device or the emulator. So far, no dice. My next … ⌘ Read more

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github_blog
feeds.twtxt.net
 (4y ago)

GitHub Enterprise Server 3.4 improves developer productivity and adds reusable workflows to CI/CD
The GitHub Enterprise Server 3.4 release candidate delivers enhancements to make life easier and more productive, from keyboard shortcuts to auto-generated release notes! ⌘ Read more

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Oatmeal
feeds.twtxt.net
 (4y ago)

** What is an addressing mode? **
In a recent post I referenced addressing modes. But what the heck are they!?

Setting the stage

The instruction register holds the program instruction that is currently being run.

A fixed number of bits within the instruction register represent the operation, e.g. “op. code” — examples of these instructions include things like add, subtract, load, and store. We can imagine the instruction register like this:

[![ASCII diagram of … ⌘ Read more

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Aaron_Parecki
feeds.twtxt.net
 (4y ago)

Stream a USB webcam to HDMI on a Raspberry Pi
This post exists to collect my notes on displaying a USB webcam on the Raspberry Pi HDMI outputs. This is not the same as streaming the webcam (easy), and this is not for use with the Raspberry Pi camera module. This is specifically for USB UVC webcams. ⌘ Read more

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Oatmeal
feeds.twtxt.net
 (4y ago)

** Notes on 6502 Assembly **
The NES runs a very slightly modified 6502 processor. What follows are some very introductory, and not at all exhaustive notes on 6502 Assembly, or ASM.

If you find this at all interesting, Easy 6502 is a really great introductory primer on 6502 Assembly that lets you get your hands dirty right from a web browser.

Numbers

Numbers pre … ⌘ Read more

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nixos-news
feeds.twtxt.net
 (4y ago)

Nix 2.6.0 released
We’re pleased to announce the availability of
Nix 2.6.0.

Instructions how to install Nix on different platforms can be found on
the download page.

Here are the release notes:

  • New builtin functionbuiltins.zipAttrsWith with the same
    functionality as lib.zipAttrsWith from Nixpkgs, but
    much more efficient.

  • The Nix CLI now searches for aflake.nix up until the
    root of the current Git repository … ⌘ Read more

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quark
ferengi.one
 (4y ago)
↳ In-reply-to » The original twt is unavailable. It may have been edited or deleted, or is from an unknown or muted feed.

@prologic@twtxt.net, who calls me name when I am busy profiting? 😂 In a less serious note—because nothing is more serious than making profit, of course—yes, it seems your avatar issue has been fixed. I am kind of sad, I looked forward each day to see which random one was going to show. LOL.

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Planet_Jabber_XMPP
feeds.twtxt.net
 (4y ago)

Peter Saint-Andre: Meditations on Bach #9: Musical Monadology
In meditation #7 of this series, I took note of some similarities between the aesthetics of Aristotle and the music of Bach. Another intriguing influence might be the monadology of Gottfried Wilhelm Leibniz (1646-1716), who directly influenced philosophers and musical theorists in the Bach’s orbit: for instance, Bach’s student Lorenz Mizler (1711-1778) was a follower of the Leibniz scholar Christian Wolff (1679-1754). In chapter 5 of his book Music in the Culture of th … ⌘ Read more

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newest_python_peps
feeds.twtxt.net
 (4y ago)

PEP 678: Enriching Exceptions with Notes
Exception objects are typically initialized with a message that describes the
error which has occurred. Because further information may be available when the
exception is caught and re-raised, this PEP proposes to add a .__note__
attribute and update the builtin traceback formatting code to include it in
the formatted traceback following the exception string. ⌘ Read more

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