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CORE SERVICES
REQUEST
REQUEST
VERIFY
YES
NO
RETRY
WRITES
Web App
Mobile App
API Gateway
single entry
Token
valid?
Orders Service
order write
Postgres
orders
LEGEND
FOCAL
DECISION
STORE
INPUT
SERVICE
import-mermaid
导入 · Mermaid
INGRESS SOURCES
Web Client App
Rate: 4 req/sec (Steady)
Mobile Native API
Rate: 3 req/sec (Steady)
Payment Webhooks
Rate: 8 req/sec (Spike)
Legacy ERP Batch
Rate: 12 req/sec (Spike)
Central Ingress Queue Buffer
Capacity: 5 slots (Bounded FIFO)
Slot 1: req_web_8019 [GET /api]
Slot 2: req_mob_4412 [POST /auth]
DEPTH
2/5
Slot 3: req_pay_9920 [WEBHOOK]
Slot 4: req_erp_1044 [BATCH]
Slot 5: req_erp_1045 [FULL]
FULL
5/5
WARN
429 Rate Limiter & Overflow Sink
Status: 429 Backpressure (19 req/sec Shed)
Constrained Worker Service
Instance: Worker-Node-01
Service Capacity: 8 req/sec max
Status: PROCESSING [FIFO]
Downstream Database & Core API
Result: 200 OK Admitted Traffic Stream (8 req/sec)
System State: Controlled Equilibrium
Worker Protected · Backpressure Active
Admitted Flow
High Ingress
429 Backpressure
Normal Slot
Capacity Warn
Overflown (429)
Queue Depth Badge
queue-animated
扇入队列 · 动画