---
title: "PrefetchScheduler"
description: "Implementations of this interface accept prefetch requests via [schedulePrefetch] and decide when
to execute them in a way that will have minimal impact on user experience, e.g. during frame idle
time.

Requests should be executed by invoking [PrefetchRequest.execute]. The implementation of
[PrefetchRequest.execute] will return `false` when all work for that request is done, or `true`
when it still has more to do but doesn't think it can complete it within
[PrefetchRequestScope.availableTimeNanos]."
type: "interface"
---

<div class='type'>Interface</div>


<a id='references'></a>

<div class='sourceset sourceset-common'>Common</div>


> **Deprecated** Customization of PrefetchScheduler is no longer supported. LazyLayout will attach an appropriate scheduler internally. If you needed to customize it please file a Feature Request.


```kotlin
@ExperimentalFoundationApi
interface PrefetchScheduler
```


Implementations of this interface accept prefetch requests via `schedulePrefetch` and decide when
to execute them in a way that will have minimal impact on user experience, e.g. during frame idle
time.

Requests should be executed by invoking `PrefetchRequest.execute`. The implementation of
`PrefetchRequest.execute` will return `false` when all work for that request is done, or `true`
when it still has more to do but doesn't think it can complete it within
`PrefetchRequestScope.availableTimeNanos`.


## Functions

```kotlin
fun schedulePrefetch(prefetchRequest: PrefetchRequest)
```


Accepts a prefetch request. Implementations should find a time to execute them which will
have minimal impact on user experience.