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marcos-marado-atmind_booster
feeds.twtxt.net
 (3y ago)

RT by @mind_booster: Dear public bodies, business, & politicians: “incremental change is no longer an option: broad-based economy-wide transformations are required to avoid closing the window of opportunity to limit global warming to well below 2°C, pref. 1.5°C. Every fraction of a degree matters.”
Dear public bodies, business, & politicians: “incremental change is no longer an option: broad-based economy-wide transformations are required to avoid closing the window of opportunity to limit global warming to w … ⌘ Read more

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marcos-marado-atmind_booster
feeds.twtxt.net
 (3y ago)

“Para Portugal, […] seria necessário garantir uma redução de emissões de pelo menos 61% até 2030 relativamente aos níveis de 2005, em vez dos atuais 55% na Lei de bases do Clima, para alinhar o país com a meta de 1,5°C”
“Para Portugal, […] seria necessário garantir uma redução de emissões de pelo menos 61% até 2030 relativamente aos níveis de 2005, em vez dos atuais 55% na Lei de bases do Clima, para alinhar o país com a meta de 1,5°C”

[nitter.net/ZEROasts/status/1575415098352586760#m](https://nitter.n … ⌘ Read more

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xuu
txt.sour.is
 (3y 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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marcos-marado-atmind_booster
feeds.twtxt.net
 (3y ago)

“we looked at how damaging the journey of overshooting the 2°C temperature target would be,
[…]
The results suggest that a temporary overshoot would cause waves of irreversible extinctions and lasting damage to tens of thousands of species”
https://theconversation.com/climate-crisis-even-temporarily-overshooting-2-c-would-cause-permanent-damage-to-earths-species-185929?utm_source=twitter&utm_medium=bylinetwitterbutton
“we looked at how damaging the journey of overshooting the 2°C temperature target would … ⌘ Read more

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lyse
lyse.isobeef.org
 (3y ago)

Went on a hike this evening and brought my camera along. The 26°C felt much nicer than yesterday’s 33°C. I perfectly met a mate who also wanted to go for a quick walk, just like we planned it. The first half hour we went together and then I parted for the longer route to the local mountain. The sunset was absolutely brilliant, but the aftermath turned out to be very boring.

Sunset

Photo 9 shows the entrance to a wasp nest next to the bench in the previous take. The greenery blocks most the view, though. Several individuals took off and returned. But it wasn’t too crowded. Nothing like at a typical honey bee hive at this point in time

What I found quite strange, there was quite a lot of smell of dead meat and butyric acid in the air. Hello hot summer. Both in the forest as well as in the village. I think I noticed those nasty odors at six or seven different places. Never experienced that before. Not to thaaat extent.

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lyse
lyse.isobeef.org
 (3y ago)

I just read that on average we get about 108 liters of rain per square meter in July. This year it has only been 6 liters so far. I truly hope that we get some heavy rain later this evening. But looking at the forecast I reckon it will only be a few drops, if at all. It’s supposed to get less and less with each day and even hour I look at the weather report. :-( Terrible 35°C at the moment. Bwäh!

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Rob
jsreed5.org
 (3y ago)

The problem I have with the vast majority of social movements, left or right, is that they often lead to projection instead of introspection. Instead of person A trying to decide how person B can treat person C better, person A should try to decide how person A can treat person C better.

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lyse
lyse.isobeef.org
 (3y ago)

My mate and I spontaneously decided to go for a longer tour today in 29°C heat. We ended up hiking 23 km in 4:30 hours. I had two liters of mineral water in my backpack and we bought a bottle of cherry limonade each on the way in. In the end we opted for pear limo at the same self-service fridge. What a great invention these small vending machines and self-service huts are! In Germany shops are closed on Sundays, so we would have needed to find an open restaurant (plenty didn’t survive Corona) with some detours.

It was my first time on that particular terrain. We went through some beautiful and quaint forest paths with scenic views. I forgot to put my SD card back into my camera, so no photos until my mate will send me his.

Now my feet a cooling off in a bucket of cold water. Superb.

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lyse
lyse.isobeef.org
 (3y ago)

Yesterday, we had a heavy thunderstorm in the evening. At first it wasn’t too bad, just thunder in the distance and then a few drops of rain for at most five minutes. That was it. Alright, I thought, it’s over, let me call a mate and walk to the dairy farm. The heavy clouds looked awesome, a bit threatening but mostly harmless and just beautiful. We decided on a small detour to the home made ice cream vending machine and got ourselves some expensive, but very yummy pineapple/mint, yoghurt and raspberry/basil tubs. Mint was super strong, had to eat three spoons of some other flavors to actually taste it. A few spoons in and then the thunder rolled in from nowhere. So we quickly headed for the dairy farm while eating our ice creams. Half way there the sky floodgates opened and we took cover under a tree at the local playground. A minute later we decided to climb up the slide tower, because it had a proper roof. A tiny bit of hail cam down, but nothing serious.

About 15-20 minutes the rain stopped and the thunder and lighning rolled past. So we continued our journey and I finally filled my two one liter bottles successfully. Every now and then it drizzled a little bit through the forest. We reached our homes and a couple minutes later rain hit again. Thunder and lighning went crazy. The sky lit up every few seconds and this continued through half of the night.

Right after I hung up to meet my mate, another mate called and reported a few villages north of us they experienced hail sized a bit under golf balls. But he luckily managed to get the car in the underground carpark in time.

Today, it rained the whole morning. This was great since the temperatures stayed below 20°C, so my walk was a real joy. It’s going to get close to 30°C tomorrow, though, gnarf, örks, bwäh. :-(

Sunset, once again

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github_blog
feeds.twtxt.net
 (3y ago)

GitHub enables the development of functional safety applications by adding support for coding standards AUTOSAR C++ and CERT C++
GitHub is excited to announce the release of CodeQL queries that implement the standards CERT C++ and AUTOSAR C++. These queries can aid developers looking to demonstrate ISO 26262 Part 6 process compliance. ⌘ Read more

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Planet_Jabber_XMPP
feeds.twtxt.net
 (3y ago)

Erlang Solutions: Modern Software Engineering Principles for Fintechs by Daniel Pilon at SumUp
Daniel Pilon is a Software Engineering Manager at SumUp. Since 2007 he has worked across several industries before arriving in the fintech space. He has experience in many programming languages, such as C#, Java and JavaScript but since discovering Elixir and the power of functional programming a few years ago, he hasn’t looked back.

Right now he is building SumUp Bank, a complete digital banking solution … ⌘ Read more

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luke_smiths_blog
feeds.twtxt.net
 (3y 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
 (3y 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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niplav.site
 (3y ago)

second, there’s predictions. a prediction is Done when it’s made. you could add comments, explanations, models &c, but the prediction can be Done and stand there on its own. (there is a slight problem with the fact that predictions need to be updated over time, though, so there is some Piling there as well).

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