Useful for: developersanalytics
The Big Picture
The actual execution of a scheduled call - includes dispatch result for success/failure.
Use Cases
- Track task execution outcomes
- Monitor scheduled operations
From Chain Metadata
Dispatched some task.
Triggers
Preconditions
- Block reached scheduled time
- Task existed in Agenda
Effects
Postconditions
- Task executed (success or failure recorded in result)
Side Effects
- Side effects of the dispatched call
- May reschedule if periodic
Event Data
| # | Name | Type | Description |
|---|---|---|---|
| 0 | task | (u32, u32) | Task address as (block_number, index) tuple |
| 1 | id | Option | Optional 32-byte task name (None for anonymous tasks) |
| 2 | result | Result | Dispatch result (Ok or Err with error details) |
Code Examples
import { ApiPromise, WsProvider } from "@polkadot/api";
import { stringCamelCase } from "@polkadot/util";
const provider = new WsProvider("wss://entrypoint-finney.opentensor.ai:443");
const api = await ApiPromise.create({ provider });
// Subscribe to Dispatched events
api.query.system.events((events) => {
events
.filter(({ event }) =>
event.section === stringCamelCase("Scheduler") &&
event.method === "Dispatched"
)
.forEach(({ event }) => {
console.log("Dispatched:", event.data.toHuman());
});
});Runtime Info
- Pallet Index
- 15
- Event Index
- 2
- First Version
- v133
- Current Version
- v393