How to set-up DynamoDB trigger using AWS Lambda

Question

I'm trying to create a DynamoDB trigger using DynamoDB Streams and AWS Lambda.But I am not very familiar with AWS Services yet, so i don’t know but how to read and process a DynamoDB Stream event in Java 8.

Essentially, what I want to do is create a record in table B whenever a record is created in table A.

Could any of you please point me to a code or post that handles this use case in Java?

Answer 1

Well this code worked for me. You can use it to receive and process DynamoDB events in a Lambda function -

public class Handler implements RequestHandler<DynamodbEvent, Void> {

    @Override
    public Void handleRequest(DynamodbEvent dynamodbEvent, Context context) {

        for (DynamodbStreamRecord record : dynamodbEvent.getRecords()) {

            if (record == null) {
                continue;
            }

            // Your code here
            // Write to Table B using DynamoDB Java API
        }

        return null;
    }
}

When you create your Lambda, add the stream from table A as your event source, and that's it.