QUALITY_DECLARATION

This document is a declaration of software quality for the class_loader package, based on the guidelines in REP-2004.

class_loader Quality Declaration

The package class_loader claims to be in the Quality Level 1 category.

Below are the rationales, notes, and caveats for this claim, organized by each requirement listed in the Package Requirements for Quality Level 1 in REP-2004.

Version Policy [1]

Version Scheme [1.i]

class_loader uses semver according to the recommendation for ROS Core packages in the ROS 2 Developer Guide, and is at or above a stable version.

Version Stability [1.ii]

class_loader is at a stable version, i.e. >= 1.0.0. The current version can be found in its package.xml, and its change history can be found in its CHANGELOG.

Public API Declaration [1.iii]

All symbols in the installed headers are considered part of the public API.

All installed headers are in the include directory of the package, headers in any other folders are not installed and considered private.

API Stability Within a Released ROS Distribution [1.iv]/[1.vi]

class_loader will notbreak public API within a released ROS distribution, i.e. no major releases once the ROS distribution is released.

ABI Stability Within a Released ROS Distribution [1.v]/[1.vi]

class_loader will maintain ABI stability within a ROS distribution.

Change Control Process [2]

class_loader follows the recommended guidelines for ROS Core packages in the ROS 2 Developer Guide.

Change Requests [2.i]

This package requires that all changes occur through a pull request. Check the ROS 2 Developer Guide for additional information.

Contributor Origin [2.ii]

This package has a confirmation of contributor origin policy, which can be found in CONTRIBUTING.

Peer Review Policy [2.iii]

Following the recommended guidelines for ROS Core packages, all pull requests must have at least 1 peer review.

Continuous Integration [2.iv]

All pull requests must pass CI on all tier 1 platforms

Currently nightly results can be seen here:

• linux-aarch64_release

• linux_release

• mac_osx_release

• windows_release

Documentation Policy [2.v]

All pull requests must resolve related documentation changes before merging

Documentation [3]

Feature Documentation [3.i]

class_loader has a ROS 2 feature list. The feature list for ROS 1 can be found here, where each item in the list links to the corresponding feature documentation.

Public API Documentation [3.ii]

class_loader has documentation of its public API and it is hosted. There is documentation for all of the public API using docblocks, and new additions to the public API require documentation before being added.

License [3.iii]

The license for class_loader is BSD-3-Clause, and a summary is in each source file, the type is declared in the package.xml manifest file, and a full copy of the license is in the LICENSE file.

There is an automated test which runs a linter (ament_copyright) that ensures each file has a license statement.

Copyright Statement [3.iv]

The copyright holders each provide a statement of copyright in each source code file in class_loader.

There is an automated test which runs a linter (ament_copyright) that ensures each file has at least one copyright statement.

Most recent test results can be found here

Testing [4]

Feature Testing [4.i]

Each feature in class_loader has corresponding tests which simulate typical usage, and they are located in the test directory.

Currently nightly results can be seen here:

• linux-aarch64_release

• linux_release

• mac_osx_release

• windows_release

Public API Testing [4.ii]

Each part of the public API have tests, and new additions or changes to the public API require tests before being added. The tests aim to cover both typical usage and corner cases, but are quantified by contributing to code coverage.

Coverage [4.iii]

class_loader follows the recommendations for ROS Core packages in the ROS 2 Developer Guide, and opts to use branch coverage instead of line coverage.

This includes:

• tracking and reporting line coverage statistics

• achieving and maintaining a reasonable branch line coverage (90-100%)

• no lines are manually skipped in coverage calculations

Changes are required to make a best effort to keep or increase coverage before being accepted, but decreases are allowed if properly justified and accepted by reviewers.

This package has testing coverage of at least 95%. Current coverage statistics can be viewed here. A description of how coverage statistics are calculated is summarized in the ROS 2 On-boarding Guide.

Performance [4.iv]

class_loader follows the recommendations for performance testing of C/C++ code in the ROS 2 Developer Guide, and opts to do performance analysis on each release rather than each change.

System level performance benchmarks that cover features of class_loader can be found at:

• Benchmarks

• Performance

Changes that introduce regressions in performance must be adequately justified in order to be accepted and merged.

Linters and Static Analysis [4.v]

class_loader uses and passes all the standard linters and static analysis tools for a C++ package as described in the ROS 2 Developer Guide.

Dependencies [5]

Below are evaluations of each of class_loader’s run-time and build-time dependencies that have been determined to influence the quality.

It has one “buildtool” dependency, which does not affect the resulting quality of the package because it does not contribute to the public library API.

It also has several test dependencies, which do not affect the resulting quality of the package because these are only used to build and run test code.

Direct Runtime ROS Dependencies [5.i]/[5.ii]

Direct Runtime non-ROS Dependency [5.iii]

Platform Support [6]

class_loader supports all of the tier 1 platforms as described in REP-2000, and tests each change against all of them.

Currently nightly results can be seen here:

• linux-aarch64_release

• linux_release

• mac_osx_release

• windows_release

Vulnerability Disclosure Policy [7.i]

This package conforms to the Vulnerability Disclosure Policy in REP-2006.

Current status Summary

The chart below compares the requirements in the REP-2004 with the current state of the class_loader package.

Number	Requirement	Current state
1	Version policy	—
1.i	Version Policy available	✓
1.ii	Stable version	✓
1.iii	Declared public API	✓
1.iv	API stability policy	✓
1.v	ABI stability policy	✓
1.vi_	API/ABI stable within ros distribution	✓
2	Change control process	—
2.i	All changes occur on change request	✓
2.ii	Contributor origin (DCO, CLA, etc)	✓
2.iii	Peer review policy	✓
2.iv	CI policy for change requests	✓
2.v	Documentation policy for change requests	✓
3	Documentation	—
3.i	Per feature documentation	✓
3.ii	Per public API item documentation	✓
3.iii	Declared License(s)	✓
3.iv	Copyright in source files	✓
3.v.a	Quality declaration linked to README	✓
3.v.b	Centralized declaration available for peer review	✓
4	Testing	—
4.i	Feature items tests	✓
4.ii	Public API tests	✓
4.iii.a	Using coverage	✓
4.iii.a	Coverage policy	✓
4.iv.a	Performance tests (if applicable)	?
4.iv.b	Performance tests policy	✓
4.v.a	Code style enforcement (linters)	✓
4.v.b	Use of static analysis tools	✓
5	Dependencies	—
5.i	Must not have ROS lower level dependencies	✓
5.ii	Optional ROS lower level dependencies	✓
5.iii	Justifies quality use of non-ROS dependencies	✓
6	Platform support	—
6.i	Support targets Tier1 ROS platforms	✓
7	Security	—
7.i	Vulnerability Disclosure Policy	✓