Processing Amazon S3 batch events

To enhance the documentation, the following additions would be beneficial:

A dedicated section under Amazon S3 -> Using Batch Operations or an example code for AWS SDK for Java specifically focusing on processing S3 batch events with Java Lambda functions.
Step-by-step instructions on how to set up a Java Lambda function to receive and process S3 batch events, including code snippets for: • Retrieving the batch event data from the Lambda input stream • Parsing the S3 batch event JSON structure • Iterating through the individual tasks within the batch event • Decoding the S3 object keys • Performing desired operations on the S3 objects (e.g., copying, processing, indexing) • Generating and returning the appropriate batch response
Best practices and performance considerations when handling large batch events, such as implementing parallelism, batching operations, and efficient resource management.
Complete end-to-end sample code demonstrating the entire workflow, from receiving the S3 batch event to processing the objects and returning the batch response. For example: @Override public void handleRequest(InputStream inputStream, OutputStream outputStream, Context context) { AmazonS3 s3Client = AmazonS3ClientBuilder.standard().withRegion(AWS_ELASTIC_REGION).build(); BulkProcessor processor = processor(es, BULK_ACTIONS, BULK_CONCURRENCY); PrintWriter writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream, StandardCharsets.UTF_8))); try { BufferedReader eventReader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8)); ObjectMapper objectMapper = new ObjectMapper(); for (String event; (event = eventReader.readLine()) != null; ) {
```
    S3BatchEvent batchEvent = objectMapper.readValue(event, S3BatchEvent.class);
    S3BatchResponse response = new S3BatchResponse();
    response.setInvocationSchemaVersion(batchEvent.getInvocationSchemaVersion());
    response.setInvocationId(batchEvent.getInvocationId());
    // Ensure that the result of response.getResults() is not null by creating an empty list
    response.setResults(new ArrayList<>());

    for (S3BatchEvent.Task task : batchEvent.getTasks()) {
        String taskId = task.getTaskId();
        String s3Key = decode(task.getS3Key());
        // Perform desired operations on the S3 object
        // ...
    }
}
```
} catch (IOException e) { // Handle exceptions } }

awsdocs / aws-doc-sdk-examples

Processing Amazon S3 batch events #6663

Background story

What does this example accomplish?

Which AWS service(s)?

Which AWS SDKs or tools?

Are there existing code examples to leverage?

Do you have any reference code?