NIAD-5467 - Clinical information missing from bundle

[MartinWheelerMT]

What

• Add 'synchronized' to COPC Message handler, due to race condition when attemping to e merge and uncompress large EHR Extract.
• Update changelog.

Why

This has proven impossible to replicate locally, but we have identified an area where a race condition may occur when multiple threads may attempt to merge and uncompress a large EHR bundle at the same time, causing the bundle to be corrupted.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Internal change (non-breaking change with no effect on the functionality affecting end users)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes
• I have updated the Changelog with details of my change in the UNRELEASED section if this change will affect end users
• A corresponding change has been made to the Mapping Documentation repository

[Copilot]

Pull request overview

This PR aims to prevent corruption of large EHR Extract bundles by adding synchronization around the “merge + uncompress + bundle” step in the COPC message flow, and documenting the fix in the changelog.

Changes:

• Added a synchronized block around canMergeCompleteBundle / mergeAndBundleMessage in COPCMessageHandler.
• Updated CHANGELOG.md with an Unreleased “Fixed” entry describing the race-condition mitigation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
gp2gp-translator/src/main/java/uk/nhs/adaptors/pss/translator/task/COPCMessageHandler.java	Adds synchronization around merging/uncompressing the complete EHR Extract bundle.
CHANGELOG.md	Documents the race-condition fix in the Unreleased section.

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[github-actions]

Images built and published to ECR using a Build Id of PR-1210-a00f99f

[github-actions]

Looks good. All 3 mutations in this change were killed.

class	surviving	killed
💯uk.nhs.adaptors.pss.translator.task.COPCMessageHandler	0	3

See https://pitest.org

• Arcmutate licence valid until 2028-03-02 (yyyy/mm/dd) (non-commercial use only)
• Project uses Spring, but the Arcmutate Spring plugin is not present.