Code Review

Use this skill when reviewing SynapseML changes.

Steps

1. Inspect diff: git --no-pager diff --stat && git --no-pager diff
2. Run Scala style: sbt scalastyle test:scalastyle
3. Run Python format check: black --check --extend-exclude 'docs/' .
4. Run targeted tests for touched code.
5. Apply the checklists below to every changed file.
6. Report only concrete issues with file paths and fixes.

Security Checklist

Apply when changes touch serialization, I/O, network, or authentication code.

Deserialization (CWE-502)

• No raw ObjectInputStream.readObject() — use SafeObjectInputStream with an allowlist
• resolveClass allowlist validates array component types — never allowlist the [ prefix directly; array handling must extract and validate the component class name
• resolveProxyClass is overridden to block or validate dynamic proxy interfaces
• Allowlist uses package-prefix matching, not blocklisting
• Allowlist presets contain no catch-all entries that bypass the filtering logic

Input Validation

• File paths, URLs, and user-supplied strings are validated before use
• No unsanitized string interpolation into SQL, shell commands, or config

Resource Management

• Streams, connections, and closeable resources use using() or try-finally
• Cleanup runs even when assertions or exceptions are thrown (especially in tests)

Secrets & Credentials

• No hardcoded secrets, tokens, or passwords in source or test code
• Credentials loaded from environment variables or secure config only

API Compatibility Checklist

Apply when changes modify public classes, traits, or companion objects.

Binary Compatibility (JVM)

• No method signature changes on existing public methods (default parameters generate synthetic bridges — use explicit overloads instead)
• No removed or renamed public classes, traits, or objects
• Companion object extends DefaultParamsReadable[T] preserved if it existed

Source Compatibility

• New parameters have defaults so existing callers compile unchanged
• No narrowed return types or widened parameter types on public methods
• Import changes don't break wildcard imports in downstream code

Scala Checklist

• License header present (enforced by scalastyle)
• Wrappable trait mixed in if the class needs a Python wrapper
• SynapseMLLogging trait mixed in; logClass() called in constructor
• No wildcard imports where explicit imports suffice (java.io._ → named imports)
• No RDD API usage — DataFrame/Dataset only
• Lines ≤ 120 chars, files ≤ 800 lines

Python Checklist

• License header present
• Formatted with black==22.3.0
• No edits to files under target/ (auto-generated)
• Hand-written overrides in src/main/python/ extend the generated _ClassName

Test Checklist

• New functionality has corresponding tests
• Tests use using() for resource cleanup (no bare .close() after assertions)
• Negative tests verify rejection/error cases, not just happy paths
• No test-only dependencies leaked into main scope