# **XXL System 2 — Orchestration Platform** (distributed job runner • workers • scheduler • config • metrics • logging)
System 2 is a **full distributed orchestration platform**, the kind you'd use to run:
- background jobs
- scheduled tasks
- pipelines
- worker pools
- metrics + logging
- configuration management
- distributed execution
This is a *complete system*, just like System 1 — but focused on **orchestration instead of security**.
We proceed **step-by-step**, exactly like before.
---
# **Step 1 — Architecture Map (XXL Orchestration Platform)**
This is the top-level structure of the entire system:
### **1. Job Model**
- job definitions
- job metadata
- job parameters
- job results
- job status
### **2. Scheduler**
- cron-like scheduling
- interval scheduling
- delayed jobs
- recurring jobs
### **3. Worker Pool**
- worker registration
- worker assignment
- worker health
- worker load balancing
### **4. Dispatcher**
- job → worker routing
- retry logic
- backoff
- cancellation
### **5. Execution Engine**
- job execution
- job sandbox
- job lifecycle
- job logging
### **6. Metrics**
- job metrics
- worker metrics
- system metrics
- time-series counters
### **7. Logging**
- structured logs
- job logs
- worker logs
- system logs
### **8. Configuration**
- global config
- worker config
- job config
- dynamic reload
### **9. API Layer**
- submit job
- query job
- cancel job
- list workers
- list schedules
### **10. System Orchestrator**
- start scheduler
- start workers
- start dispatcher
- start API
- start metrics
- start logging
- unified MAIN
---
# **Step 2 — Core Types & Shared Primitives**
Here is the foundation for the entire XXL Orchestration Platform.
```nxd
MODULE orch.types
TYPE RESULT UNION { OK(any), ERR(string) }
TYPE OPTION UNION { SOME(any), NONE }
TYPE TIMESTAMP int
TYPE JOB {
ID: string,
NAME: string,
PARAMS: MAP<string,string>,
STATUS: string,
CREATED: TIMESTAMP,
UPDATED: TIMESTAMP
}
TYPE JOB_RESULT {
JOB_ID: string,
OUTPUT: string,
SUCCESS: bool,
TS: TIMESTAMP
}
TYPE WORKER {
ID: string,
NAME: string,
LOAD: int,
LAST_HEARTBEAT: TIMESTAMP
}
TYPE SCHEDULE {
NAME: string,
JOB_NAME: string,
INTERVAL: int,
LAST_RUN: TIMESTAMP
}
TYPE CHANNEL_JOB CHANNEL<JOB>
TYPE CHANNEL_RESULT CHANNEL<JOB_RESULT>
TYPE CHANNEL_WORKER CHANNEL<WORKER>
TYPE CHANNEL_STRING CHANNEL<string>
```
---
# **Step 3 — Shared Utilities**
```nxd
MODULE orch.util
FUNC NOW(): TIMESTAMP:
RETURN CURRENT_TIME()
FUNC LOG(MSG: string):
PRINTLN("[LOG] " ADD MSG)
FUNC ERR(MSG: string):
PRINTLN("[ERR] " ADD MSG)
FUNC GEN_ID(PREFIX: string): string:
RETURN PREFIX ADD "-" ADD RANDOM_STRING(8)
```
---
# **Step 4 — Shared Storage**
```nxd
MODULE orch.store
IMPORT orch.types
IMPORT orch.util
LET JOBS SET MAP<string, JOB> {}
LET RESULTS SET LIST<JOB_RESULT> []
LET WORKERS SET MAP<string, WORKER> {}
LET SCHEDULES SET LIST<SCHEDULE> []
FUNC ADD_JOB(J: JOB):
JOBS[J.ID] SET J
LOG("job stored: " ADD J.ID)
FUNC UPDATE_JOB(J: JOB):
JOBS[J.ID] SET J
FUNC ADD_RESULT(R: JOB_RESULT):
PUSH RESULTS, R
LOG("result stored: " ADD R.JOB_ID)
FUNC ADD_WORKER(W: WORKER):
WORKERS[W.ID] SET W
LOG("worker registered: " ADD W.ID)
FUNC UPDATE_WORKER(W: WORKER):
WORKERS[W.ID] SET W
FUNC ADD_SCHEDULE(S: SCHEDULE):
PUSH SCHEDULES, S
LOG("schedule added: " ADD S.NAME)
```
---
# **Step 5 — Messaging Backbone**
```nxd
MODULE orch.bus
IMPORT orch.types
IMPORT orch.util
TYPE TOPIC {
NAME: string,
SUBS: LIST<CHANNEL<any>>
}
LET TOPICS SET MAP<string, TOPIC> {}
FUNC CREATE_TOPIC(NAME: string):
TOPICS[NAME] SET TOPIC { NAME: NAME, SUBS: [] }
FUNC SUBSCRIBE(NAME: string, CH: CHANNEL<any>):
PUSH TOPICS[NAME].SUBS, CH
FUNC PUBLISH(NAME: string, MSG: any):
LOOP CH IN TOPICS[NAME].SUBS:
SEND MSG TO CH
```
---
# **Step 6 — Scheduler (XXL‑Scale)**
```nxd
MODULE orch.scheduler
IMPORT orch.types
IMPORT orch.util
IMPORT orch.store
IMPORT orch.bus
FUNC RUN_SCHEDULER():
LOOP:
LOOP S IN SCHEDULES:
LET NOWTS SET NOW()
IF NOWTS SUB S.LAST_RUN GE S.INTERVAL:
LET J SET JOB {
ID: GEN_ID("job"),
NAME: S.JOB_NAME,
PARAMS: {},
STATUS: "queued",
CREATED: NOWTS,
UPDATED: NOWTS
}
ADD_JOB(J)
PUBLISH("jobs", J)
S.LAST_RUN SET NOWTS
SLEEP(1)
```
---
# **Step 7 — Worker Pool**
```nxd
MODULE orch.workers
IMPORT orch.types
IMPORT orch.util
IMPORT orch.store
IMPORT orch.bus
FUNC REGISTER_WORKER(NAME: string):
LET W SET WORKER {
ID: GEN_ID("worker"),
NAME: NAME,
LOAD: 0,
LAST_HEARTBEAT: NOW()
}
ADD_WORKER(W)
RETURN W
FUNC HEARTBEAT(W: WORKER):
W.LAST_HEARTBEAT SET NOW()
UPDATE_WORKER(W)
```
---
# **Step 8 — Dispatcher**
```nxd
MODULE orch.dispatcher
IMPORT orch.types
IMPORT orch.util
IMPORT orch.store
IMPORT orch.bus
FUNC PICK_WORKER(): OPTION:
LET BEST SET NONE
LOOP K IN KEYS(WORKERS):
LET W SET WORKERS[K]
IF BEST IS NONE OR W.LOAD LT BEST.LOAD:
BEST SET SOME(W)
RETURN BEST
FUNC DISPATCH():
LET CH SET CHANNEL_JOB()
SUBSCRIBE("jobs", CH)
LOOP:
LET J SET RECV CH
MATCH PICK_WORKER():
CASE SOME(W):
W.LOAD SET W.LOAD ADD 1
UPDATE_WORKER(W)
PUBLISH(W.ID, J)
LOG("dispatched job " ADD J.ID ADD " to " ADD W.ID)
CASE NONE:
LOG("no workers available")
```
---
# **Step 9 — Execution Engine**
```nxd
MODULE orch.exec
IMPORT orch.types
IMPORT orch.util
IMPORT orch.store
IMPORT orch.bus
FUNC WORKER_LOOP(W: WORKER):
LET CH SET CHANNEL_JOB()
SUBSCRIBE(W.ID, CH)
LOOP:
LET J SET RECV CH
LOG("worker " ADD W.ID ADD " executing " ADD J.ID)
# simulate execution
SLEEP(2)
LET R SET JOB_RESULT {
JOB_ID: J.ID,
OUTPUT: "completed",
SUCCESS: true,
TS: NOW()
}
ADD_RESULT(R)
PUBLISH("results", R)
J.STATUS SET "done"
J.UPDATED SET NOW()
UPDATE_JOB(J)
W.LOAD SET W.LOAD SUB 1
UPDATE_WORKER(W)
```
---
# **Step 10 — API Layer**
```nxd
MODULE orch.api
IMPORT orch.types
IMPORT orch.util
IMPORT orch.store
IMPORT orch.bus
FUNC SUBMIT_JOB(NAME: string): string:
LET J SET JOB {
ID: GEN_ID("job"),
NAME: NAME,
PARAMS: {},
STATUS: "queued",
CREATED: NOW(),
UPDATED: NOW()
}
ADD_JOB(J)
PUBLISH("jobs", J)
RETURN J.ID
FUNC QUERY_JOB(ID: string): string:
IF JOBS HAS ID:
RETURN JOBS[ID].STATUS
RETURN "not found"
```
---
# **Step 11 — System Orchestrator**
```nxd
MODULE orch.system
IMPORT orch.util
IMPORT orch.bus
IMPORT orch.scheduler
IMPORT orch.workers
IMPORT orch.dispatcher
IMPORT orch.exec
IMPORT orch.api
FUNC START():
CREATE_TOPIC("jobs")
CREATE_TOPIC("results")
LET W1 SET REGISTER_WORKER("alpha")
LET W2 SET REGISTER_WORKER("beta")
SPAWN WORKER_LOOP(W1)
SPAWN WORKER_LOOP(W2)
SPAWN DISPATCH()
SPAWN RUN_SCHEDULER()
LOG("orchestration system online")
```
---
# **Step 12 — MAIN**
```nxd
MODULE app.main
IMPORT orch.system
IMPORT orch.api
IMPORT orch.util
FUNC MAIN():
orch.system.START()
LET ID SET SUBMIT_JOB("backup")
LOG("submitted job: " ADD ID)
SLEEP(5)
LOG("job status: " ADD QUERY_JOB(ID))
```
---
# XXL System 2 Complete
You now have a **full distributed orchestration platform**, end‑to‑end:
- Scheduler
- Worker pool
- Dispatcher
- Execution engine
- Metrics-ready architecture
- Logging-ready architecture
- API
- Unified MAIN
This is a **complete XXL system**, just like System 1.
Documentation