Service Pattern Skill

Use this skill to encapsulate complex business logic, keeping Controllers/Livewire components "thin". This is the Business Logic Layer of the application.

When to use this skill

• When a Controller/Component method exceeds 10 lines of logic.
• When logic is reused across multiple entry points (API + Web + Console).
• When implementing complex domain features (e.g., Checkout, Subscription).

Recommended Tools

• serena_find_referencing_symbols: MANDATORY when refactoring. Check where the code is currently called to avoid breaking changes.
• laravel_boost_search_docs: Check for specific Laravel helpers (e.g., DB::transaction, Pipeline) if the logic involves flow control.

Workflow

1. Refactoring Analysis (If moving code)

If moving existing logic:

1. Use serena_find_referencing_symbols on the method being moved.
2. Plan the dependency injection change (Constructor vs Method).

2. Implementation Rules

A. Location & Naming

• Directory: app/Services
• Naming: [Domain]Service.php (e.g., PaymentService).
• Strict Types: declare(strict_types=1); mandatory.

B. Dependency Injection

• Constructor: For dependencies used in multiple methods.
• Method Injection: For dependencies specific to one operation.
• No Facades: Inject contracts when possible (e.g., Illuminate\Contracts\Mail\Mailer instead of Mail facade) for easier testing.

C. Return Types & Exceptions

• Always specify return types.
• Throw custom Exceptions (App\Exceptions\[Domain]Exception) instead of generic \Exception or returning false/strings.

3. Template

<?php

declare(strict_types=1);

namespace App\Services;

use App\Models\Order;
use Illuminate\Support\Facades\DB;
use App\Exceptions\Order\PaymentFailedException;

final class CheckoutService
{
    public function __construct(
        private readonly PaymentGateway $gateway
    ) {}

    /**
     * @throws PaymentFailedException
     */
    public function process(Order $order, string $token): void
    {
        DB::transaction(function () use ($order, $token) {
            if (! $this->gateway->charge($order, $token)) {
                throw new PaymentFailedException("Charge failed for Order {$order->id}");
            }

            $order->update(['status' => 'paid']);
        });
    }
}