> ## Documentation Index
> Fetch the complete documentation index at: https://docs.qu.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Subscriber

A **Subscriber** manages a subscription.

Only developers sub-classing [**AbstractProvider**](/sdk/content/classes/AbstractProvider) will care about this, if they are
modifying a low-level feature of how subscriptions operate.

## Properties

| Property           | Type     | Description                                                                                                                                           |
| :----------------- | :------- | :---------------------------------------------------------------------------------------------------------------------------------------------------- |
| `pollingInterval?` | `number` | The frequency (in ms) to poll for events, if polling is used by the subscriber.<br /><br />For non-polling subscribers, this must return `undefined`. |

## Methods

### pause()

```ts theme={null}
pause(dropWhilePaused?): void
```

Called when the subscription should pause.

If `dropWhilePaused`, events that occur while paused should not be emitted
[**Subscriber.resume**](/sdk/content/interfaces/Subscriber#resume).

#### Parameters

| Parameter          | Type      | Description                               |
| :----------------- | :-------- | :---------------------------------------- |
| `dropWhilePaused`? | `boolean` | If `true`, events that occur while paused |

#### Returns

`void`

#### Source

[providers/abstract-provider.ts:233](https://github.com/dominant-strategies/quais.js/blob/c1c12d43f9d34c6baad2b0542bd6d0acd6fefcbf/src/providers/abstract-provider.ts#L233)

***

### resume()

```ts theme={null}
resume(): void
```

Resume a paused subscriber.

#### Returns

`void`

#### Source

[providers/abstract-provider.ts:238](https://github.com/dominant-strategies/quais.js/blob/c1c12d43f9d34c6baad2b0542bd6d0acd6fefcbf/src/providers/abstract-provider.ts#L238)

***

### start()

```ts theme={null}
start(): void
```

Called initially when a subscriber is added the first time.

#### Returns

`void`

#### Source

[providers/abstract-provider.ts:218](https://github.com/dominant-strategies/quais.js/blob/c1c12d43f9d34c6baad2b0542bd6d0acd6fefcbf/src/providers/abstract-provider.ts#L218)

***

### stop()

```ts theme={null}
stop(): void
```

Called when there are no more subscribers to the event.

#### Returns

`void`

#### Source

[providers/abstract-provider.ts:223](https://github.com/dominant-strategies/quais.js/blob/c1c12d43f9d34c6baad2b0542bd6d0acd6fefcbf/src/providers/abstract-provider.ts#L223)