# RegisterEventTopic
<a name="API_RegisterEventTopic"></a>

Associates a directory with an Amazon SNS topic. This establishes the directory as a publisher to the specified Amazon SNS topic. You can then receive email or text (SMS) messages when the status of your directory changes. You get notified if your directory goes from an Active status to an Impaired or Inoperable status. You also receive a notification when the directory returns to an Active status.

## Request Syntax
<a name="API_RegisterEventTopic_RequestSyntax"></a>

```
{
   "DirectoryId": "string",
   "TopicName": "string"
}
```

## Request Parameters
<a name="API_RegisterEventTopic_RequestParameters"></a>

The request accepts the following data in JSON format.

 ** [DirectoryId](#API_RegisterEventTopic_RequestSyntax) **   <a name="DirectoryService-RegisterEventTopic-request-DirectoryId"></a>
The Directory ID that will publish status messages to the Amazon SNS topic.  
Type: String  
Pattern: `^d-[0-9a-f]{10}$`   
Required: Yes

 ** [TopicName](#API_RegisterEventTopic_RequestSyntax) **   <a name="DirectoryService-RegisterEventTopic-request-TopicName"></a>
The Amazon SNS topic name to which the directory will publish status messages. This Amazon SNS topic must be in the same region as the specified Directory ID.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 256.  
Pattern: `[a-zA-Z0-9_-]+`   
Required: Yes

## Response Elements
<a name="API_RegisterEventTopic_ResponseElements"></a>

If the action is successful, the service sends back an HTTP 200 response with an empty HTTP body.

## Errors
<a name="API_RegisterEventTopic_Errors"></a>

For information about the errors that are common to all actions, see [Common Error Types](CommonErrors.md).

 ** ClientException **   
A client exception has occurred.    
 ** Message **   
The descriptive message for the exception.  
 ** RequestId **   
The Amazon request identifier.
HTTP Status Code: 400

 ** EntityDoesNotExistException **   
The specified entity could not be found.    
 ** Message **   
The descriptive message for the exception.  
 ** RequestId **   
The Amazon request identifier.
HTTP Status Code: 400

 ** InvalidParameterException **   
One or more parameters are not valid.    
 ** Message **   
The descriptive message for the exception.  
 ** RequestId **   
The Amazon request identifier.
HTTP Status Code: 400

 ** ServiceException **   
An exception has occurred in Amazon Directory Service.    
 ** Message **   
The descriptive message for the exception.  
 ** RequestId **   
The Amazon request identifier.
HTTP Status Code: 500

## Examples
<a name="API_RegisterEventTopic_Examples"></a>

The following examples are formatted for legibility.

### Example Request
<a name="API_RegisterEventTopic_Example_1"></a>

This example illustrates one usage of RegisterEventTopic.

```
POST / HTTP/1.1
Host: ds.us-west-2.amazonaws.com
Accept-Encoding: identity
Content-Length: 63
X-Amz-Target: DirectoryService_20150416.RegisterEventTopic
X-Amz-Date: 20161214T232258Z
User-Agent: aws-cli/1.11.24 Python/2.7.9 Windows/7 botocore/1.4.81
Content-Type: application/x-amz-json-1.1
Authorization: AWS4-HMAC-SHA256 
 Credential=AKIAI7E3BYXS3example/20161214/us-west-2/ds/aws4_request, 
 SignedHeaders=content-type;host;x-amz-date;x-amz-target, 
 Signature=6e1e2996789f568cf057fa66e70b1ba114d7388510787be6092055ab97a07828

 {
   "DirectoryId": "d-926example",
   "TopicName": "snstopicexample"
 }
```

### Example Response
<a name="API_RegisterEventTopic_Example_2"></a>

This example illustrates one usage of RegisterEventTopic.

```
HTTP/1.1 200 OK
x-amzn-RequestId: a68a1e79-c19b-11e6-870b-c3330207df37
Content-Type: application/x-amz-json-1.1
Content-Length: 29
Date: Wed, 14 Dec 2016 23:23:01 GMT

{  
  
}
```

## See Also
<a name="API_RegisterEventTopic_SeeAlso"></a>

For more information about using this API in one of the language-specific Amazon SDKs, see the following:
+  [Amazon Command Line Interface V2](https://docs.amazonaws.cn/goto/cli2/ds-2015-04-16/RegisterEventTopic) 
+  [Amazon SDK for .NET V4](https://docs.amazonaws.cn/goto/DotNetSDKV4/ds-2015-04-16/RegisterEventTopic) 
+  [Amazon SDK for C\$1\$1](https://docs.amazonaws.cn/goto/SdkForCpp/ds-2015-04-16/RegisterEventTopic) 
+  [Amazon SDK for Go v2](https://docs.amazonaws.cn/goto/SdkForGoV2/ds-2015-04-16/RegisterEventTopic) 
+  [Amazon SDK for Java V2](https://docs.amazonaws.cn/goto/SdkForJavaV2/ds-2015-04-16/RegisterEventTopic) 
+  [Amazon SDK for JavaScript V3](https://docs.amazonaws.cn/goto/SdkForJavaScriptV3/ds-2015-04-16/RegisterEventTopic) 
+  [Amazon SDK for Kotlin](https://docs.amazonaws.cn/goto/SdkForKotlin/ds-2015-04-16/RegisterEventTopic) 
+  [Amazon SDK for PHP V3](https://docs.amazonaws.cn/goto/SdkForPHPV3/ds-2015-04-16/RegisterEventTopic) 
+  [Amazon SDK for Python](https://docs.amazonaws.cn/goto/boto3/ds-2015-04-16/RegisterEventTopic) 
+  [Amazon SDK for Ruby V3](https://docs.amazonaws.cn/goto/SdkForRubyV3/ds-2015-04-16/RegisterEventTopic)