[Enhancement] Enhance MessageImpl to allow subclasses to access properties

[bcaw-ofeer]

Before Creating the Enhancement Request

• I have confirmed that this should be classified as an enhancement rather than a bug/feature.

Programming Language of the Client

Java

Summary

Enhance MessageImpl to allow subclasses to access properties

Motivation

Currently, MessageImpl.properties is private and getProperties() returns a new HashMap copy. This prevents inheritance-based access to properties and creates unnecessary object allocations. Making properties protected allows subclasses to access the properties map directly, while returning an unmodifiable map prevents external modifications while avoiding object creation overhead.

Describe the Solution You'd Like

1. Change MessageImpl.properties visibility from private to protected
2. Modify getProperties() to return Collections.unmodifiableMap(properties) instead of new HashMap<>(properties)

This change enables:

• Inheritance-based access to properties in subclasses
• Immutable view of properties to prevent external modifications
• Better performance by avoiding unnecessary HashMap allocations
• Maintains backward compatibility while improving extensibility

Describe Alternatives You've Considered

None

Additional Context

No response

[github-actions]

This issue is stale because it has been open for 30 days with no activity. It will be closed in 3 days if no further activity occurs.

[github-actions]

This issue was closed because it has been inactive for 3 days since being marked as stale.