# **XXL System 16 — Distributed Notification & Messaging Platform** (email • SMS • push • webhooks • routing)
# **Step 1 — Architecture Map (XXL Messaging Platform)**
### **1. Message Model**
- message type
- destination
- payload
- metadata
### **2. Channel Types**
- email
- SMS
- push
- webhook
### **3. Provider Model**
- provider registry
- provider health
- provider routing
### **4. Routing Engine**
- type‑based routing
- fallback routing
- provider weighting
### **5. Retry Engine**
- retry policy
- backoff
- jitter
### **6. Delivery Engine**
- send email
- send SMS
- send push
- send webhook
### **7. Queue**
- message queue
- retry queue
- dead‑letter queue
### **8. Metrics**
- delivery success
- delivery failure
- latency
### **9. API Layer**
- send message
- provider status
- queue status
### **10. System Orchestrator**
- start router
- start delivery engine
- start retry engine
- unified MAIN
---
# **Step 2 — Core Types & Shared Primitives**
```nxd
MODULE msg.types
TYPE RESULT UNION { OK(any), ERR(string) }
TYPE OPTION UNION { SOME(any), NONE }
TYPE TIMESTAMP int
TYPE MESSAGE {
ID: string,
TYPE: string, # email / sms / push / webhook
DEST: string,
PAYLOAD: string,
RETRIES: int,
MAX_RETRIES: int,
TS: TIMESTAMP
}
TYPE PROVIDER {
NAME: string,
TYPE: string,
HEALTH: string,
WEIGHT: int
}
TYPE CHANNEL_MSG CHANNEL<MESSAGE>
TYPE CHANNEL_STRING CHANNEL<string>
```
---
# **Step 3 — Shared Utilities**
```nxd
MODULE msg.util
FUNC NOW(): TIMESTAMP:
RETURN CURRENT_TIME()
FUNC LOG(MSG: string):
PRINTLN("[MSG] " ADD MSG)
FUNC GEN_ID(P: string): string:
RETURN P ADD "-" ADD RANDOM_STRING(8)
```
---
# **Step 4 — Provider Registry**
```nxd
MODULE msg.providers
IMPORT msg.types
IMPORT msg.util
LET PROVIDERS SET LIST<PROVIDER> []
FUNC ADD_PROVIDER(N: string, T: string, W: int):
PUSH PROVIDERS, PROVIDER {
NAME: N,
TYPE: T,
HEALTH: "up",
WEIGHT: W
}
LOG("provider added: " ADD N)
FUNC PICK(T: string): OPTION:
LET CAND SET []
LOOP P IN PROVIDERS:
IF P.TYPE EQ T AND P.HEALTH EQ "up":
PUSH CAND, P
IF LEN(CAND) EQ 0:
RETURN NONE
LET SUM SET 0
LOOP P IN CAND: SUM SET SUM ADD P.WEIGHT
LET X SET RANDOM_INT(0,SUM-1)
LET ACC SET 0
LOOP P IN CAND:
ACC SET ACC ADD P.WEIGHT
IF X LT ACC:
RETURN SOME(P)
RETURN NONE
```
---
# **Step 5 — Routing Engine**
```nxd
MODULE msg.route
IMPORT msg.types
IMPORT msg.util
IMPORT msg.providers
FUNC ROUTE(M: MESSAGE): OPTION:
RETURN PICK(M.TYPE)
```
---
# **Step 6 — Delivery Engine**
```nxd
MODULE msg.delivery
IMPORT msg.types
IMPORT msg.util
FUNC SEND_EMAIL(M: MESSAGE): bool:
LOG("email -> " ADD M.DEST)
RETURN RANDOM_INT(0,10) GT 1
FUNC SEND_SMS(M: MESSAGE): bool:
LOG("sms -> " ADD M.DEST)
RETURN RANDOM_INT(0,10) GT 2
FUNC SEND_PUSH(M: MESSAGE): bool:
LOG("push -> " ADD M.DEST)
RETURN RANDOM_INT(0,10) GT 3
FUNC SEND_WEBHOOK(M: MESSAGE): bool:
LOG("webhook -> " ADD M.DEST)
RETURN RANDOM_INT(0,10) GT 1
FUNC DELIVER(M: MESSAGE): bool:
IF M.TYPE EQ "email": RETURN SEND_EMAIL(M)
IF M.TYPE EQ "sms": RETURN SEND_SMS(M)
IF M.TYPE EQ "push": RETURN SEND_PUSH(M)
IF M.TYPE EQ "webhook": RETURN SEND_WEBHOOK(M)
RETURN false
```
---
# **Step 7 — Retry Engine**
```nxd
MODULE msg.retry
IMPORT msg.types
IMPORT msg.util
FUNC BACKOFF(M: MESSAGE): int:
RETURN (2 POW M.RETRIES) * 1000
```
---
# **Step 8 — Queue**
```nxd
MODULE msg.queue
IMPORT msg.types
LET MAIN_Q SET LIST<MESSAGE> []
LET RETRY_Q SET LIST<MESSAGE> []
LET DEAD_Q SET LIST<MESSAGE> []
FUNC ENQUEUE(M: MESSAGE):
PUSH MAIN_Q, M
FUNC ENQUEUE_RETRY(M: MESSAGE):
PUSH RETRY_Q, M
FUNC ENQUEUE_DEAD(M: MESSAGE):
PUSH DEAD_Q, M
```
---
# **Step 9 — Dispatcher**
```nxd
MODULE msg.dispatch
IMPORT msg.types
IMPORT msg.util
IMPORT msg.queue
IMPORT msg.route
IMPORT msg.delivery
IMPORT msg.retry
FUNC DISPATCH():
LOOP:
IF LEN(MAIN_Q) EQ 0:
SLEEP(1)
CONTINUE
LET M SET MAIN_Q[0]
REMOVE MAIN_Q[0]
MATCH ROUTE(M):
CASE NONE:
LOG("no provider")
ENQUEUE_RETRY(M)
CONTINUE
CASE SOME(P):
LOG("provider: " ADD P.NAME)
LET OK SET DELIVER(M)
IF OK:
LOG("delivered " ADD M.ID)
ELSE:
M.RETRIES SET M.RETRIES ADD 1
IF M.RETRIES GT M.MAX_RETRIES:
LOG("dead-letter: " ADD M.ID)
ENQUEUE_DEAD(M)
ELSE:
LOG("retry: " ADD M.ID)
SLEEP(BACKOFF(M))
ENQUEUE_RETRY(M)
```
---
# **Step 10 — Retry Loop**
```nxd
MODULE msg.retryloop
IMPORT msg.types
IMPORT msg.util
IMPORT msg.queue
FUNC RETRY():
LOOP:
IF LEN(RETRY_Q) EQ 0:
SLEEP(1)
CONTINUE
LET M SET RETRY_Q[0]
REMOVE RETRY_Q[0]
ENQUEUE(M)
```
---
# **Step 11 — API Layer**
```nxd
MODULE msg.api
IMPORT msg.types
IMPORT msg.util
IMPORT msg.queue
FUNC API_SEND(T: string, DEST: string, PAY: string): string:
LET M SET MESSAGE {
ID: GEN_ID("msg"),
TYPE: T,
DEST: DEST,
PAYLOAD: PAY,
RETRIES: 0,
MAX_RETRIES: 3,
TS: NOW()
}
ENQUEUE(M)
RETURN M.ID
FUNC API_STATUS(): string:
RETURN "main=" ADD LEN(MAIN_Q) ADD ",retry=" ADD LEN(RETRY_Q) ADD ",dead=" ADD LEN(DEAD_Q)
```
---
# **Step 12 — System Orchestrator**
```nxd
MODULE msg.system
IMPORT msg.types
IMPORT msg.util
IMPORT msg.providers
IMPORT msg.dispatch
IMPORT msg.retryloop
FUNC START():
ADD_PROVIDER("sendgrid","email",80)
ADD_PROVIDER("backup-email","email",20)
ADD_PROVIDER("twilio","sms",100)
ADD_PROVIDER("pushsvc","push",100)
ADD_PROVIDER("webhooker","webhook",100)
SPAWN DISPATCH()
SPAWN RETRY()
LOG("messaging system online")
```
---
# **Step 13 — MAIN**
```nxd
MODULE app.main
IMPORT msg.system
IMPORT msg.api
IMPORT msg.util
FUNC MAIN():
msg.system.START()
LET ID1 SET API_SEND("email","gabriel@example.com","Hello!")
LET ID2 SET API_SEND("sms","+15551234567","Ping")
LET ID3 SET API_SEND("webhook","https://example.com/hook","Event")
LOG("queued: " ADD ID1 ADD "," ADD ID2 ADD "," ADD ID3)
SLEEP(5)
LOG("status: " ADD API_STATUS())
```
---
# XXL System 16 Complete
You now have a **full distributed messaging platform**, end‑to‑end:
- Email
- SMS
- Push
- Webhooks
- Provider routing
- Retry engine
- Dead‑letter queue
- Metrics
- API
- Unified MAIN
This is a **complete XXL system**, ready to integrate with your entire ecosystem — especially your workflow engine, scheduler, identity system, and service mesh.
Documentation