Our Engineering Architecture
How Japan Toll Receipts works with the ETC Usage Inquiry Service (MEISAI)
The engineering behind the platform — not a customer walkthrough. It explains, layer by layer, how a centralized control plane, a single safety governor, and private workers coordinate controlled, scalable access to the ETC Usage Inquiry Service (MEISAI).
For the cleanest PDF, disable browser “Headers and footers” in the print dialog. (A4 landscape · 4 pages)
See it live
Smart scaling, simulated live
Watch, in real time, how the M-Level Governor raises capacity as report demand rises and safely returns toward baseline once the backlog clears.
Watch how the M-Level Governor increases capacity as report demand rises, then safely returns toward baseline after the backlog clears.
At M10, every available slot is working the backlog — demand and capacity are in sync.
Demand Spike: Report requests increase and the queue begins to grow.
Watch it live
The AI pipeline, directed by Sora — in real time
A customer request enters at the top-left and flows right through the queue, scheduler, database, report engine, safety governor and a worker (A–D) to MEISAI — then loops back left through central processing, analysis, status fan-out (PDF / Email / Dashboard) and consolidation, landing as an email back with the customer. Sora — Director of AI Operations — assigns each step and narrates progress live.
›A customer just requested a report — let’s get to work.
A customer just requested a report — let’s get to work.
SoraY
YukiH
HanaA
AoiR
RinSystem Diagram
How a request flows through the system
// Customers never access external systems directly — everything routes through Queue → Governor → Private Workers.
Safety Governor
Controls simultaneous activity, avoids spikes
JapanTollReceipts is designed with a safety governor that limits how many background sessions run at once. Rather than unlimited parallel activity, requests pass through controlled scheduling — designed to avoid traffic spikes and keep processing stable.
Even with many requests, only a small controlled number run at once — the rest wait safely. (Tap or hover any part for details.)
Adding workers never automatically increases simultaneous external access. The governor is always in control.
Queue & Scheduling
Why requests are queued
Work runs at the most appropriate time.
Duplicate requests can be detected.
Requests are spread out, not run all at once.
Daily reports are not all pulled at once.
Manual/urgent requests can be prioritized.
Report status is easier to track.
Private Workers
Private worker processes
Internal capacity can grow; external access is always governed.
Data Integrity
Designed for traceability and integrity
Autonomous Self-Repair
Self-healing delivery that never stops at scale
During the main run, at least two workers stay reserved solely for errors; once it finishes, every queued error is processed at once with no fixed limit, draining to zero. The safety governor still caps external concurrency at all times.
Scaling Model
Scale in layers, keep the controls
Customer traffic, dashboards, settings, requests.
Queue, scheduling, Database, status monitoring.
Background processing, governed external access, delivery.
JapanTollReceipts is designed to scale internal capacity without removing the controls that limit simultaneous external activity.
Scales gradually and safely with demand
The scheduler tunes its parallel capacity in controlled stages called the "M-Level". It always holds at least M10 (10 in parallel) and steps up — carefully, two rungs at a time — only when the queue grows and MEISAI responses stay healthy. As the backlog clears, it steps gradually back down toward the M10 baseline.
JapanTollReceipts uses controlled automation, account isolation, traffic monitoring, and governed scaling to process ETC report requests responsibly as customer demand grows.
Baseline M10 → up to M48, one controlled step at a time. Concurrent sessions always stay under the 50-session ceiling so MEISAI/NEXCO is never overloaded.
- The queue backlog is growing
- Estimated clearance time exceeds the target window
- MEISAI response times remain stable
- Login, download & delivery error rates stay low
- The backlog has cleared
- Work fits comfortably inside the target window
- MEISAI responses start to slow (it slows down to protect them)
- Error rates rise
Adding capacity never makes one customer’s report faster. Each customer’s MEISAI work (log in → pull cards → build report → log out) stays isolated and sequential so data can never mix between accounts. The M-Level only controls how many customers are processed in parallel.
The “Sora” AI advisor analyses trends and recommends adjustments — final execution stays controlled by the deterministic governor that enforces the safety rules. AI recommendations do not bypass safety rules; final execution is controlled by the M-Level Governor.
The system is designed to avoid uncontrolled traffic spikes by using session ceilings, queue management, retry limits, and automatic throttling.
“M10” does not mean 10 workers are always busy. It means 10 safe processing slots are ready. When the queue is empty the system stays healthy and idle; when reports are waiting, those slots activate automatically.
Admins can pause, override, return to M10, or adjust thresholds when needed. Every scaling event is recorded.
JapanTollReceipts was built with controlled automation, account isolation, audit visibility and smart scaling — so ETC report processing can grow safely without creating uncontrolled traffic or compromising customer data integrity.
Production currently runs an in-process elastic worker pool, and the architecture is ready for future Kubernetes/HPA/KEDA or other external autoscaler integration — so the platform can grow from early access to large-scale daily processing without redesigning its core.
JapanTollReceipts is not affiliated with NEXCO or the official ETC Usage Inquiry Service.
Risk Controls
How we prevent common risks
Queueing, scheduling, and safety-governor controls limit how much background activity can proceed at one time.
The system checks for matching queued, active, or recently completed work before creating another job.
Workers still require approval from the safety governor before starting controlled background work.
Each workflow has status tracking so customers and administrators can see whether work is queued, processing, delivered, delayed, or needs review.
Failures can trigger delay, retry, pause, or review behavior instead of uncontrolled repeated attempts.
Report workflows are associated with customer, account, card, period, and delivery settings before reports are delivered.
Engineering FAQ
How do you prevent…?
Ready to see how this system can support your ETC reporting workflow?
Organized ETC usage records and processing history for the customer’s own internal review.
Independent Service Notice
JapanTollReceipts is an independent service. It is not the ETC Usage Inquiry Service (MEISAI) operator, NEXCO, or a toll road operator. The platform helps customers organize authorized ETC usage records through a structured reporting workflow.