Stream retry support part 2: Introduce a new split method in AsyncRequestBody that returns an SdkP…

[zoewangg]

…ublisher of ClosableAsyncRequestBody and use it in s3 multipart client

Motivation and Context

• This PR introduces a new splitV2 method in AsyncRequestBody that returns an SdkPublisher of ClosableAsyncRequestBody instead of AsyncRequestBody, enabling proper resource management for split request bodies. The change is primarily implemented to support streaming retry for S3 multipart client for retry Support retries for individual parts of a multipart upload in Java SDK V2 #6198

• Introduces ClosableAsyncRequestBody interface extending AsyncRequestBody with close capability

• Updates S3 multipart client implementation to use the new splitV2 method
  Maintains backward compatibility by deprecating the original split method

Testing

Added wiremock tests

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have read the CONTRIBUTING document
• Local run of mvn install succeeds
• My code follows the code style of this project
• My change requires a change to the Javadoc documentation
• I have updated the Javadoc documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed
• I have added a changelog entry. Adding a new entry must be accomplished by running the scripts/new-change script and following the instructions. Commit the new file created by the script in .changes/next-release with your changes.
• My change is to implement 1.11 parity feature and I have updated LaunchChangelog

License

• I confirm that this pull request can be released under the Apache 2 license

[Copilot]

Pull Request Overview

This PR introduces a new splitV2 method in AsyncRequestBody that returns an SdkPublisher of ClosableAsyncRequestBody instead of AsyncRequestBody, enabling proper resource management for split request bodies. This change is designed to support streaming retry for S3 multipart uploads.

• Adds ClosableAsyncRequestBody interface extending AsyncRequestBody with close capability
• Updates S3 multipart client implementation to use the new splitV2 method
• Maintains backward compatibility by deprecating the original split method

Reviewed Changes

Copilot reviewed 17 out of 18 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
ClosableAsyncRequestBody.java	New interface extending AsyncRequestBody with close capability
AsyncRequestBody.java	Adds splitV2 method and deprecates original split method
SplittingPublisher.java	Updates to return ClosableAsyncRequestBody and improve resource management
UploadWithUnknownContentLengthHelper.java	Updated to use splitV2 and properly close request bodies
UploadWithKnownContentLengthHelper.java	Updated to use splitV2 method
KnownContentLengthAsyncRequestBodySubscriber.java	Updated to handle ClosableAsyncRequestBody and close resources
Test files	Updated tests to use new interfaces and verify retry behavior

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[sonarqubecloud]

Quality Gate failed

Failed conditions
66.5% Coverage on New Code (required ≥ 80%)
12.9% Duplication on New Code (required ≤ 3%)
C Reliability Rating on New Code (required ≥ A)

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