# MissionCallback

The **MissionCallback** module defines the callbacks invoked after synchronization starts. These callbacks can be used as input parameters in [registerMissionListener](js-apis-distributedMissionManager.md#distributedmissionmanagerregistermissionlistener).

> **NOTE**
>
> The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.

## MissionCallback.notifyMissionsChanged

**System capability**: SystemCapability.Ability.AbilityRuntime.Mission

**System API**: This is a system API.

**Parameters**

| Name| Template| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| deviceId |  string | Yes| Device ID in the callback that notifies a mission change.|

**Example**
```ts
import distributedMissionManager from '@ohos.distributedMissionManager';

distributedMissionManager.registerMissionListener(
    {
        deviceId: '123456'
    },
    {
        notifyMissionsChanged: (deviceId: string) => {
            console.log(`notifyMissionsChanged deviceId: ${JSON.stringify(deviceId)}`);
        },
        notifySnapshot: (deviceId: string, mission: number) => {
            console.log(`notifySnapshot deviceId: ${JSON.stringify(deviceId)}`);
            console.log(`notifySnapshot mission: ${JSON.stringify(mission)}`);
        },
        notifyNetDisconnect: (deviceId: string, state: number) => {
            console.log(`notifyNetDisconnect deviceId: ${JSON.stringify(deviceId)}`);
            console.log(`notifyNetDisconnect state: ${JSON.stringify(state)}`);
        }
    }
);
```

## MissionCallback.notifySnapshot

**System capability**: SystemCapability.Ability.AbilityRuntime.Mission

**System API**: This is a system API.

**Parameters**

| Name| Template| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| deviceId |  string | Yes| Device ID in the callback that notifies a snapshot change.|
| mission |  number | Yes| Mission ID in the callback that notifies a snapshot change.|

**Example**
```ts
import distributedMissionManager from '@ohos.distributedMissionManager';

distributedMissionManager.registerMissionListener(
    {
        deviceId: '123456'
    },
    {
        notifyMissionsChanged: (deviceId: string) => {
            console.log(`notifyMissionsChanged deviceId: ${JSON.stringify(deviceId)}`);
        },
        notifySnapshot: (deviceId: string, mission: number) => {
            console.log(`notifySnapshot deviceId: ${JSON.stringify(deviceId)}`);
            console.log(`notifySnapshot mission: ${JSON.stringify(mission)}`);
        },
        notifyNetDisconnect: (deviceId: string, state: number) => {
            console.log(`notifyNetDisconnect deviceId: ${JSON.stringify(deviceId)}`);
            console.log(`notifyNetDisconnect state: ${JSON.stringify(state)}`);
        }
    }
);
```

## MissionCallback.notifyNetDisconnect

**System capability**: SystemCapability.Ability.AbilityRuntime.Mission

**System API**: This is a system API.

**Parameters**

| Name| Template| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| deviceId |  string | Yes| Device ID in the callback that notifies disconnection.|
| state |  number | Yes| Network status in the callback that notifies disconnection.|

**Example**
```ts
import distributedMissionManager from '@ohos.distributedMissionManager';

distributedMissionManager.registerMissionListener(
    {
        deviceId: '123456'
    },
    {
        notifyMissionsChanged: (deviceId: string) => {
            console.log(`notifyMissionsChanged deviceId: ${JSON.stringify(deviceId)}`);
        },
        notifySnapshot: (deviceId: string, mission: number) => {
            console.log(`notifySnapshot deviceId: ${JSON.stringify(deviceId)}`);
            console.log(`notifySnapshot mission: ${JSON.stringify(mission)}`);
        },
        notifyNetDisconnect: (deviceId: string, state: number) => {
            console.log(`notifyNetDisconnect deviceId: ${JSON.stringify(deviceId)}`);
            console.log(`notifyNetDisconnect state: ${JSON.stringify(state)}`);
        }
    }
);
```