Add Support for ARN as DynamoDB Standard Type

[belugabehr]

Describe the feature

Update DynamoDB client to natively support a new datatype: com.amazonaws.arn.Arn

Use Case

We store many ARNs in our DynamoDB instance related to SQS topics, StepFunctions State Machines, etc. - would be nice for to have native support for ARNs in DynamoDB mapper.

Proposed Solution

Add ARN support to list of standard supported types.

https://github.com/aws/aws-sdk-java/blob/master/aws-java-sdk-dynamodb/src/main/java/com/amazonaws/services/dynamodbv2/datamodeling/StandardTypeConverters.java#L83

Other Information

• https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DynamoDBMapper.DataTypes.html
• https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/HowItWorks.NamingRulesDataTypes.html
• https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/arns/Arn.html

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

AWS Java SDK version used

2

JDK version used

JDK 11

Operating System and version

Linux

[yasminetalby]

Hello @belugabehr ,

Thank you very much for your submission.
It seems that you have submitted a feature request regarding DynamoDBMapper which is a AWS Java SDK V1 but mention using the AWS Java SDK V2.
In the AWS Java SDK V2, the DynamoDBEnhancedClient has replaced the DynamoDBMapper.

Currently the AWS Java SDK Team is focusing on the implementation of parity features and new features for the AWS Java SDK V2 SDK. If you would like to request new feature for the DynamoDB high-level library I would recommend you to look into migration to the AWS Java SDK v2.

Thank you very much for your submission again!
Let me know if you have any further questions or request.

Sincerely,

Yasmine

[belugabehr]

@yasminetalby,

Thank you for your consideration and engagement.

The AWS SDK Java v2 is also missing this capability.

https://github.com/aws/aws-sdk-java-v2/tree/master/services-custom/dynamodb-enhanced/src/main/java/software/amazon/awssdk/enhanced/dynamodb/internal/converter

Thanks.

[debora-ito]

Hi @belugabehr thank you for reaching out.

Right now this feels too much like an edge case to be added to the list of DynamoDB Enhanced standard attribute converters, but we will keep this feature request open and ask for upvotes 👍 from anybody who is interested in seeing this in the SDK. Depending on the interest we will revisit.

You can use the converter as a custom converter in your project, by using the @DynamoDbConvertedBy attribute annotation in your bean class or attributeConverter if you're using StaticTableSchema.

[belugabehr]

Related to: #2955, #2416, #1890

[belugabehr]

You can use the converter as a custom converter in your project, by using the @DynamoDbConvertedBy attribute annotation in your bean class or attributeConverter if you're using StaticTableSchema.

That's the current workaround, however, we store all kinds of ARNs in our DDB instance, some are even custom to our application. It just seems like ARNs should have much more robust support.