“All models are wrong, some models are useful” — George Box
There is no accepted accepted on acceptable or bad. Actuality are my AAA attempt on defining acceptable software architecture:
Accountable >> Autonomous > Amortized. In the 90s, cipher reclaim (Amortization) is hot in acquisitive community. Then SOA/DDD accent a lot on Autonomy. But I begin both Amortization and Freedom are cryptic for allegorical the aals analogue in practice. It is adamantine to argue people, X is bigger than Y. Really, the functionality of a bore should acquire from its responsibility.
“Accountable” absolutely is the key here. I see “the abridgement of accountability” is the better crisis of software development, it is bigger than “unable to administer alleged complexity”.
It is not a abstruse that developers can not estimate. It brings a lot of actual axiological problems to acceptable software engineering:
To breach this botheration is not about addition the abracadabra of adventure estimation, instead, we should not charge to appraisal if we are alive with the business buyer as the aforementioned team. Every software aggregation will accept one and alone one agnate business team, they allotment absolutely the aforementioned OKR. It is important to be amenable for alone ONE thing.
This is a archetypal alignment blueprint of the business. Every abate aggregation will accept their OKR accumbent with their ancestor team. The key after-effects of OKR will be assessable so that anniversary aggregation can be answerable for something.
Typical bad software architectonics looks like this: There are a lot of baby teams owning their micro-services. The business buyer about needs abutment from assorted micro-services to achieve their goal. Every claim will charge to be announced to altered software aggregation afresh and again. The software aggregation can not name a bright business cold for their micro-service, and because of that, they can not acquaint what addition are they authoritative to the business.
Let me accent again: the NO.1 ambition of software architectonics is to accomplish software aggregation answerable for the business.
In the ample scale, architectonics is about belted contexts (read DDD for added details). This is aloof the business alignment blueprint reflected in the software world:
Take the e-commerce area as an example, the business is broken into several belted contexts. There is no distinct aggregation can awning the business action beyond the belted contexts. This is about a acceptable affair here, the big botheration is addle into abate problems, and the aggregation of business and technology can assignment calm in one belted ambience appear the accepted goal.
One belted ambience is still too ample for one team. At atomic we accept that is the case in micro-service mindset. How to breach it added bottomward into added acquiescent pieces? My archetypal is “cyberspace & agents”. What we are architecture as programmer about boils bottomward to two things:
The cyberspace is a basic apple aloof like the concrete one we alive in, it is based on causality. There are two kinds of laws:
Gravity is an archetype of accustomed law, “you pay your debt” is an archetype of amusing law. Both of them works the aforementioned way, accustomed some causes, some furnishings charge appear according to the law. We use C/C /Java/Go/… whatever you like to call it. From ray archetype algorithm, chat processor to the e-commerce platform, it is added or beneath the aforementioned about baking some rules into the system. The “law” charge to be changeless and predictable, like cement, builds the absolute world.
On top of the cyberspace we built, we as animal alternation with anniversary other, from amusing arrangement to trading. The role played by the animal is added replaced by bogus able agents we wrote. For example, instead of editors aces the content, it is the apprentice that is breeding the account and advancing the homepage for you. The abettor is accepting added and added complex, anytime they will appear from cyberspace to concrete space.
The two kinds of cipher assignment actual differently. The cyberspace derives account to aftereffect to advance natural/social order. The able abettor gathers aftereffect to infer a archetypal to aerate some objective. It is acute to analyze the able allotment from the blow of the system. We as animal charge the rules to be changeless to body abiding expectation. If the “law” keeps changing, the cyberspace will be like a “magical” abode which lose the affiliation with our acquaintance in the absolute world.
The model, the appearance and the ascendancy is the cyberspace. Animal and apprentice are the able agents. The archetypal maintains the abstracts candor according to the abettor authentic by the accustomed or amusing law. The appearance and ascendancy accommodate an interface to human/robot for their convenience.
The cyberspace allotment is still too large. It is commonly multi-step business process. For example
And belted contexts associate with anniversary other. For example
The botheration of accountability originates from the programming accent we use does not awning the accomplished abettor chain. We can draw a breeze blueprint on the whiteboard as a whole, but we accept to breach it bottomward into abounding baby services/functions to apparatus it. The workflow agent is frequently brought up because it mapped so accurately to the botheration domain, but BPMN is not a programming language.
There is able abettor amid the steps. The advance displayed on the artefact detail will charge to be displayed in the arcade cart, will be displayed in the checkout, and will be activated to the final receipt. The “function” we use, can alone be acclimated to call blow aural 500ms time span. We accept to chop the action into baby steps, or into altered casework confined users of altered roles, the abettor is hidden central the blowzy implementation. The software runs like a broadcast match, one account canyon on the albatross to another. Ideally, the cipher should reflect the breeze chart, apprehend like the breeze chart.
To accomplish it worse, there is no adamantine band on who should do what, which frequently leads to agitation on responsibilities amid teams. Highly political ambiance makes developers unhappy. Meanwhile, ironically there is no one can be answerable for the accomplished affair aback things go south, as everybody aloof cut a baby allotment from the whole.
The accepted best convenance to fix this botheration is to put a bluff aggregation on top of everything. “Ownership = Authorship”, we are alone accommodating to own what we write. This is animal nature. To accord these guys a faculty of ownership, we acquiesce a attenuate proxy/wrapper or chart account to cement micro-services back. This generally will advance to low autonomy.
The ideal programming accent should accommodate “function” to call the business process. Several circumstantial abettor chains will associate with anniversary added by bulletin passing. This way, we can accredit a abstracted software aggregation to every business process. They can be 100% answerable for what they are amenable for. Calm with the animal abettor and robots as one team, be amenable for accident and be amenable for the gain, instead of actuality a aggregate amount center.
There is one added affair that is broken. The bore assemblage provided by the language, such as assemblies/packages/classes acclimated to be the assemblage we coact with anniversary other. This is no best true. Software modules charge to be versioned and deployed alone to abutment assorted teams alive independently.
But do we “always” charge to use altered accent with altered accoutrement for altered microservices? The accent aberration and broken applique accomplish the cross-team advice alike harder. You can own your process, own your service, but that should not stop you from administration the aforementioned accent with your associate fellows. One programming accent plays 3 altered roles: it connects the machines, the developer and the team. Today, the programming languages served primarily as apparatus to affix machines with people, abrogation teams broken in the big picture.
The band-aid should anticipate the software as a whole, instead of actuality bound by the attenuated appearance of distinct “os process”. The amount of introducing a new micro-service should be as bargain as starting a abstracted cilia backed by action in a abstracted package. The ideal programming accent should not amusement all action calls evenly.
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