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AgentCompany/builtin-skills/software-engineer/clean-code/references/class-separate-concerns.md
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ZacharyZhang-NY e74dafcd36 Silence render-disposed spam, unbreak bundled skills, drop board wake
Three independently ugly bugs that all fed the same log flood:

* Electron's `WebFrameMain.send` writes every "Render frame was disposed"
  to stderr via `console.error`. When the worker fans a second
  agent-event past a reloading renderer, we produced thousands of
  identical lines and stalled the main loop on stderr I/O. Added a
  `mainFrame.detached` guard so the send is short-circuited before
  Electron's own catch block fires, and installed a targeted filter in
  `suppress-warnings.ts` (now actually imported from the entry point)
  so the specific `console.error("Error sending from webFrameMain:"…)`
  noise never reaches the terminal. Any other payload still surfaces.

* `dispatchAgentMessage` accepted the human-reader sentinel as a wake
  target when an agent replied to `__board__` — `wakeAgentIfPossible`
  then called `db.getAgent("__board__")`, threw, and the dispatcher
  kept repeating on every send. Strip `HUMAN_SENDER_ID` at
  `resolveMessageWakeTargets`, and keep a defense-in-depth guard in the
  heartbeat so a stray caller (future automation fan-out) cannot
  reintroduce the crash.

* Pi's skills loader rejects any SKILL.md whose frontmatter `name`
  diverges from its parent directory. The four bundled `my-writing-style`
  copies declared `name: writing-style-skill`, so every install emitted
  a warning and dropped the skill. They also lived as orphan gitlinks
  (mode 160000 without .gitmodules), and the global `*.md` gitignore
  hid every other SKILL.md from version control. Fixed the frontmatter
  to match the dir, converted the dangling submodules to plain trees,
  and allowlisted `builtin-skills/**/*.md` so a fresh clone carries the
  catalogue instead of silently losing it.
2026-04-20 08:13:48 -04:00

2.4 KiB

title, impact, impactDescription, tags
title impact impactDescription tags
Separate Construction from Use MEDIUM enables testing and reduces coupling class, construction, factories, separation

Separate Construction from Use

The startup process of object construction is a separate concern from runtime logic. Applications should separate the main function (which builds objects) from the rest of the system (which uses them).

Incorrect (construction mixed with use):

public class OrderProcessor {
    public void processOrder(Order order) {
        // Construction buried in business logic
        EmailService emailService = new SmtpEmailService(
            "smtp.example.com", 587, "user", "password");
        InventoryService inventory = new InventoryServiceImpl(
            new PostgresConnection("localhost", 5432));
        PaymentGateway gateway = new StripeGateway(API_KEY);

        // Business logic
        inventory.reserve(order.getItems());
        gateway.charge(order.getPayment());
        emailService.sendConfirmation(order);
    }
}

Correct (construction separated from use):

// Main builds the object graph
public class Application {
    public static void main(String[] args) {
        EmailService emailService = new SmtpEmailService(
            Config.get("smtp.host"), Config.getInt("smtp.port"));
        InventoryService inventory = new InventoryServiceImpl(
            new PostgresConnection(Config.get("db.url")));
        PaymentGateway gateway = new StripeGateway(Config.get("stripe.key"));

        OrderProcessor processor = new OrderProcessor(
            emailService, inventory, gateway);

        processor.start();
    }
}

// Business class receives dependencies
public class OrderProcessor {
    private final EmailService emailService;
    private final InventoryService inventory;
    private final PaymentGateway gateway;

    public OrderProcessor(EmailService email, InventoryService inv,
                          PaymentGateway pay) {
        this.emailService = email;
        this.inventory = inv;
        this.gateway = pay;
    }

    public void processOrder(Order order) {
        inventory.reserve(order.getItems());
        gateway.charge(order.getPayment());
        emailService.sendConfirmation(order);
    }
}

Alternative: Use Dependency Injection frameworks (Spring, Guice) to manage construction.

Reference: Clean Code, Chapter 11: Systems