1# Work Scheduler Callbacks 2 3>  **NOTE**<br/> 4> The initial APIs of this module are supported since API version 9. API version 9 is a canary version for trial use. The APIs of this version may be unstable. 5 6 7## Modules to Import 8 9``` 10import WorkSchedulerExtensionAbility from '@ohos.WorkSchedulerExtensionAbility' 11``` 12 13## WorkSchedulerExtensionAbility.onWorkStart 14 15onWorkStart(work: workScheduler.WorkInfo): void 16 17Triggered when the Work Scheduler task starts. 18 19**System capability**: SystemCapability.ResourceSchedule.WorkScheduler 20 21**Parameters** 22 23| Name | Type | Mandatory | Description | 24| ---- | --------------------- | ---- | -------------- | 25| work | [workScheduler.WorkInfo](js-apis-workScheduler.md#workinfo) | Yes | Task to be added to the execution queue.| 26 27**Example** 28 29 ``` 30 export default class MyWorkSchedulerExtensionAbility extends WorkSchedulerExtensionAbility { 31 onWorkStart(workInfo) { 32 console.log('MyWorkSchedulerExtensionAbility onWorkStart' + JSON.stringify(workInfo)); 33 } 34 } 35 ``` 36 37## WorkSchedulerExtensionAbility.onWorkStop 38 39onWorkStop(work: workScheduler.WorkInfo): void 40 41Triggered when the Work Scheduler task stops. 42 43**System capability**: SystemCapability.ResourceSchedule.WorkScheduler 44 45**Parameters** 46 47| Name | Type | Mandatory | Description | 48| ---- | --------------------- | ---- | -------------- | 49| work | [workScheduler.WorkInfo](js-apis-workScheduler.md#workinfo) | Yes | Task to be added to the execution queue.| 50 51 52**Example** 53 54 ``` 55 export default class MyWorkSchedulerExtensionAbility extends WorkSchedulerExtensionAbility { 56 onWorkStop(workInfo) { 57 console.log('MyWorkSchedulerExtensionAbility onWorkStop' + JSON.stringify(workInfo)); 58 } 59 } 60 ``` 61
