Offloading Slow Work with Laravel Queues: High-Throughput Job Architecture

<?php

declare(strict_types=1);

namespace App\Jobs;

use App\Models\Invoice;
use App\Mail\InvoiceGeneratedMail;
use Barryvdh\DomPDF\Facade\Pdf;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
use Illuminate\Support\Facades\Mail;
use Illuminate\Support\Facades\Storage;

class GenerateAndDispatchInvoiceJob implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    public int $tries = 3;
    public array $backoff = [15, 60, 180];

    public function __construct(public readonly Invoice $invoice) {
        $this->onQueue('invoices');
    }

    public function handle(): void
    {
        $pdf = Pdf::loadView('admin.invoices.pdf', [
            'invoice' => $this->invoice,
            'balance' => $this->invoice->total_amount,
            'paid' => 0,
        ]);
        $fileName = "invoices/INV-{$this->invoice->id}.pdf";
        Storage::disk('public')->put($fileName, $pdf->output());
        $this->invoice->update(['pdf_path' => $fileName, 'status' => 'dispatched']);
        if ($this->invoice->client_email) {
            Mail::to($this->invoice->client_email)->send(new InvoiceGeneratedMail($this->invoice, $pdf->output()));
        }
    }
}