This is the new *Amazon CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [Amazon CloudFormation User Guide](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/Welcome.html).

# AWS::MediaTailor::PrefetchSchedule AvailMatchingCriteria
<a name="aws-properties-mediatailor-prefetchschedule-availmatchingcriteria"></a>

MediaTailor only places (consumes) prefetched ads if the ad break meets the criteria defined by the dynamic variables. This gives you granular control over which ad break to place the prefetched ads into.

As an example, let's say that you set `DynamicVariable` to `scte.event_id` and `Operator` to `EQUALS`, and your playback configuration has an ADS URL of `https://my.ads.server.com/path?&podId=[scte.avail_num]&event=[scte.event_id]&duration=[session.avail_duration_secs]`. And the prefetch request to the ADS contains these values `https://my.ads.server.com/path?&podId=3&event=my-awesome-event&duration=30`. MediaTailor will only insert the prefetched ads into the ad break if has a SCTE marker with an event id of `my-awesome-event`, since it must match the event id that MediaTailor uses to query the ADS.

You can specify up to five `AvailMatchingCriteria`. If you specify multiple `AvailMatchingCriteria`, MediaTailor combines them to match using a logical `AND`. You can model logical `OR` combinations by creating multiple prefetch schedules.

## Syntax
<a name="aws-properties-mediatailor-prefetchschedule-availmatchingcriteria-syntax"></a>

To declare this entity in your Amazon CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-mediatailor-prefetchschedule-availmatchingcriteria-syntax.json"></a>

```
{
  "[DynamicVariable](#cfn-mediatailor-prefetchschedule-availmatchingcriteria-dynamicvariable)" : {{String}},
  "[Operator](#cfn-mediatailor-prefetchschedule-availmatchingcriteria-operator)" : {{String}}
}
```

### YAML
<a name="aws-properties-mediatailor-prefetchschedule-availmatchingcriteria-syntax.yaml"></a>

```
  [DynamicVariable](#cfn-mediatailor-prefetchschedule-availmatchingcriteria-dynamicvariable): {{String}}
  [Operator](#cfn-mediatailor-prefetchschedule-availmatchingcriteria-operator): {{String}}
```

## Properties
<a name="aws-properties-mediatailor-prefetchschedule-availmatchingcriteria-properties"></a>

`DynamicVariable`  <a name="cfn-mediatailor-prefetchschedule-availmatchingcriteria-dynamicvariable"></a>
The dynamic variable(s) that MediaTailor should use as avail matching criteria. MediaTailor only places the prefetched ads into the avail if the avail matches the criteria defined by the dynamic variable. For information about dynamic variables, see [Using dynamic ad variables](https://docs.amazonaws.cn/mediatailor/latest/ug/variables.html) in the *MediaTailor User Guide*.  
You can include up to 100 dynamic variables.  
*Required*: Yes  
*Type*: String  
*Update requires*: [Replacement](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)

`Operator`  <a name="cfn-mediatailor-prefetchschedule-availmatchingcriteria-operator"></a>
For the `DynamicVariable` specified in `AvailMatchingCriteria`, the Operator that is used for the comparison.  
*Required*: Yes  
*Type*: String  
*Allowed values*: `EQUALS`  
*Update requires*: [Replacement](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)