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Posix - Repository TODO

📋 Part of: Chronicle Architecture Documentation Module Layer: Layer 0 (Foundation) Priority: 🟢 P3 Last Updated: 2025-11-18

Purpose

This TODO file tracks work specific to Posix that feeds into the master ARCH_TODO.md. It helps break down the architecture documentation work into manageable, repository-specific chunks.

Related Main TODO Files

Module Information for Architecture Overview

Basic Information

  • Module Name: Posix
  • Maven Artifact ID: posix
  • Primary Purpose: Provide a zero-allocation, low-latency Java facade over a portable subset of POSIX and Linux system calls for file I/O, memory mapping and CPU-affinity helpers.
  • Layer in Chronicle Stack: Layer 0 (Foundation; POSIX integration and native system-call facade)
  • Dependencies (Chronicle modules): No direct runtime Chronicle library dependencies; uses shared java-parent-pom and chronicle-quality-rules for build and quality configuration
  • Key Classes/Interfaces: PosixAPI, PosixRuntimeException, Mapping, ProcMaps, ClockId

ISO Alignment and Trust Zone

  • Trust zone identified (Edge/Core/Foundation): Posix is a Foundation (Zone C) module providing low-level POSIX integration used by Chronicle-Core and other libraries for native capabilities.
  • Shared standards reviewed: Review the shared architectural and security standards in Chronicle-Quality-Rules/src/main/docs and make sure Posix docs clearly state its scope, risks and expected use by higher-level modules.

Architecture Information for ARCH_TODO.md Stage 3

Feeds into: ARCH_TODO.md Stage 3 - Module Deep Dives (ARCH-MOD-POSIX)

  • Core Abstractions: [List primary abstractions this module provides]
  • Interactions with other modules: [Which Chronicle modules does this use/integrate with?]
  • Typical use cases: [List 2-3 common scenarios where this module is used]
  • Performance characteristics: [Key performance metrics if applicable]
  • Design patterns used: [e.g., flyweight, single writer, etc.]

Existing Documentation Audit

  • Check if src/main/docs/architecture-overview.adoc exists
    • If yes: Review quality (compare to Chronicle-Bytes standard)
    • If no: Note as gap for ARCH_TODO Stage 5.5
  • Check if src/main/docs/project-requirements.adoc exists
    • If yes: Review for ARCH_TODO Stage 1.75 (Requirements Overview)
    • If no: Note as gap for FUNC_TODO.md
  • Check if src/main/docs/decision-log.adoc exists
    • If yes: Review for ARCH_TODO Stage 1.85 (Decision Log Overview)
    • If no: Note as gap for DECISION_TODO.md
  • Check if README.adoc provides good module overview
  • Check if AGENTS.md exists and follows canonical template

Documentation Gaps (for ARCH_TODO Stage 5.5)

Missing Documentation:

  • Architecture overview? [Y/N]
  • Requirements documentation? [Y/N]
  • Decision log? [Y/N]
  • Security review? [Y/N]
  • Testing strategy? [Y/N]
  • Performance targets? [Y/N]

Documentation Quality Issues:

  • Missing :toc:, :lang: en-GB, or :source-highlighter: rouge?
  • Manual section numbering instead of :sectnums:?
  • Broken cross-references?
  • Outdated information?

Requirements for Architecture Overview (ARCH_TODO Stage 1.75)

Feeds into: Requirements Overview consolidation

  • Identify key functional requirements: [List 3-5 most important]
  • Identify key non-functional requirements:
    • Performance targets: [e.g., latency, throughput]
    • Security obligations: [e.g., bounds checking, input validation]
    • Operability requirements: [e.g., monitoring, logging]
  • Map requirements to architecture patterns: [How do requirements drive design?]

Decisions for Architecture Overview (ARCH_TODO Stage 1.85)

Feeds into: Decision Log Overview consolidation

  • Identify key architectural decisions: [List 2-4 major decisions]
    • Decision ID (if in decision-log.adoc):
    • Brief description:
    • Rationale:
    • Alternatives considered:
  • Identify decision patterns used:
    • Off-heap memory? [Y/N - explain]
    • Single writer principle? [Y/N - explain]
    • Reference counting? [Y/N - explain]
    • Flyweight pattern? [Y/N - explain]

Glossary Terms (ARCH_TODO Stage 1.5)

Feeds into: Cross-module glossary

  • Module-specific terms to include in glossary:
    • Term 1: [Definition]
    • Term 2: [Definition]
    • [Add more as needed]

ISO 9001 Quality Management Considerations

Reference: ../COMPLIANCE_QUICK_REFERENCE.md

Design Inputs (ISO 9001 Clause 8.3.3)

  • Functional requirements documented?
    • Location: src/main/docs/project-requirements.adoc
    • Requirements use Nine-Box taxonomy? (POSIX-FN-NNN)
    • Requirements are testable and verifiable?
  • Non-functional requirements documented?
    • Performance requirements (POSIX-NF-P-NNN)
    • Security requirements (POSIX-NF-S-NNN)
    • Operability requirements (POSIX-NF-O-NNN)

Design Outputs (ISO 9001 Clause 8.3.5)

  • Architecture documented?
    • Location: src/main/docs/architecture-overview.adoc
    • Describes key components and their interactions?
    • Includes interface specifications?
  • APIs and interfaces specified?
    • Public API documented (JavaDoc)?
    • Integration points with other modules described?

Design Verification (ISO 9001 Clause 8.3.4)

  • Requirements traceable to tests?
    • Test classes reference requirement IDs in comments/docs?
    • Coverage: What % of requirements have corresponding tests?
  • Test strategy documented?
    • Unit test approach
    • Integration test approach
    • Performance test approach (if applicable)
  • Code review evidence?
    • PR review process followed?
    • Review comments addressed?

Design Changes (ISO 9001 Clause 8.3.4)

  • Architectural decisions documented?
    • Location: src/main/docs/decision-log.adoc
    • Decisions include context, alternatives, rationale?
    • Impact of changes assessed?
  • Change history maintained?
    • Git commit messages describe rationale?
    • Breaking changes documented in release notes?

ISO 27001 Information Security Considerations

Reference: ../ARCHITECTURE_RESEARCH_GUIDE.md - Security Research Topics

Secure Coding (ISO 27001 Control A.8.28)

  • Input validation implemented?
    • Where are untrusted inputs received? [List entry points]
    • How are malformed inputs handled?
    • Size limits enforced?
  • Bounds checking implemented?
    • Buffer overflow prevention mechanisms?
    • Array access validation?
    • Off-heap memory bounds checked?
  • Static analysis performed?
    • Checkstyle violations reviewed?
    • SpotBugs security patterns checked?
    • Suppressions justified and documented?

Access Control (ISO 27001 Control A.8.3)

  • Access restrictions implemented?
    • Are there authentication/authorization mechanisms? [Y/N]
    • If yes, where and how are they implemented?
    • Principle of least privilege followed?
  • Privileged operations identified?
    • Which operations require elevated privileges?
    • How are they protected?

Cryptographic Controls (ISO 27001 Control A.8.24)

  • Cryptography usage identified?
    • Is encryption used? [Y/N - where?]
    • Is hashing used? [Y/N - which algorithms?]
    • Is TLS/SSL used? [Y/N - configuration?]
  • Key management?
    • How are cryptographic keys managed?
    • Are keys hardcoded? [Y/N - if yes, flag as risk]

Network Security (ISO 27001 Control A.8.22)

  • Network communication security?
    • Does this module communicate over network? [Y/N]
    • If yes, is communication encrypted?
    • How are network endpoints authenticated?
  • Network configuration?
    • Secure defaults configured?
    • Insecure protocols disabled?

Vulnerability Management (ISO 27001 Control A.8.8)

  • Known vulnerabilities?
    • Any open security issues in GitHub?
    • Any CVEs against dependencies?
  • Security testing?
    • Fuzz testing performed?
    • Security-specific test cases?
    • Penetration testing performed?

Security Documentation

  • Security review documented?
    • Location: src/main/docs/security-review.adoc
    • Threat model documented?
    • Security controls described?
    • Known limitations documented?

Improvement Tasks (ARCH_TODO Stage 5.5)

Feeds into: Improve Existing Module Documentation

High Priority

  • Create missing architecture-overview.adoc (if needed)
  • Add missing front-matter to existing docs
  • Fix broken cross-references
  • Add :sectnums: where appropriate

Medium Priority

  • Expand brief architecture docs (if < 75 lines)
  • Add "Trade-offs and Alternatives" section (following Chronicle-Bytes pattern)
  • Add performance characteristics section
  • Create decision log entries for undocumented decisions

Low Priority

  • Add diagrams (PlantUML or draw.io)
  • Create example code snippets
  • Expand requirements documentation
  • Add cross-references to other module docs

Code Quality Tasks

Reference: ../QUALITY_PLAYBOOK.md

  • Run Checkstyle scan and document violations
    • A Java 21 mvn clean verify -DskipTests run for Posix (see verify-posix-clean-verify-skipTests-java21.log) invokes Checkstyle and reports You have 0 Checkstyle violations. for this module.
  • Run SpotBugs scan and document issues
    • Earlier Java 21 quality runs (verify-posix-clean-verify-skipTests-java21.log) reported 18 SpotBugs findings across core and test/benchmark code (default encodings, lazy static initialisation, dead stores and ignored File results). These have since been fixed in code and fresh Java 21 mvn clean verify runs for Posix (see verify-posix-clean-verify-java21-tests-5.log and verify-posix-java21-spotbugs-after-fixes.log) now complete with BugInstance size is 0.
  • Identify any code review follow-ups from CODE_REVIEW_STATUS.md
    • Posix has code-review guidance in the global documentation, but no dedicated section yet in CODE_REVIEW_STATUS.md; with the SpotBugs backlog cleared, any remaining review items should be recorded there in a future pass.

Notes

  • 2025-11-18: Posix is Checkstyle- and SpotBugs-clean on Java 21 (verify-posix-clean-verify-skipTests-java21.log, verify-posix-clean-verify-java21-tests-5.log, verify-posix-java21-spotbugs-after-fixes.log). Remaining TODO items in this file relate to documentation and compliance and are being treated as longer-running work tracked as deferred in TODO_STATUS.md.

Completion Checklist

Before marking this repository's contribution to ARCH_TODO as complete:

  • All "Module Information" sections filled out
  • Existing documentation audited
  • Requirements identified for ARCH_TODO Stage 1.75
  • Decisions identified for ARCH_TODO Stage 1.85
  • Glossary terms identified for ARCH_TODO Stage 1.5
  • Documentation gaps documented
  • Improvement tasks prioritized
  • Information contributed to relevant ARCH_TODO stages

When complete, update: ../ARCH_TODO.md Stage 3 tracking matrix