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form: add form layout descriptor to write path - #1018
Add a per-file layout descriptor to the FORM write path, recording form_layout_version and technologies.
This provides the foundation for future readers to identify the file layout and support files written by earlier FORM versions, without relying on configuration to determine the storage technologies.
The descriptor is written at finalize and uses a backend-specific representation, independent of the container machinery.
Reader support and backward compatibility are not implemented in this PR.
Code: Add a per-file FORM layout descriptor with the layout version (1.0) and the technologies used in that file.
Code: Write descriptors during finalization, before navigation tables and product dictionaries. Reject reserved FORM block names, unplanned product files or technologies, and files that mix major technologies.
Storage: Add descriptor-writing interfaces to the storage writer and storage file. Store descriptor entries in the generic storage file, and write them as a backend-native TList of TNamed objects in ROOT.
Tests: Add coverage for descriptor writing, per-file technology metadata, and invalid plans. Test ROOT descriptor writing with detached, non-writable, and writable files.
Scope: This adds write-path metadata only. Reader support and backward compatibility are not implemented.
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Walkthrough
The persistence writer now records layout-version and technology metadata for planned output files. Storage interfaces and implementations carry the descriptor entries, and the ROOT-backed file writes them as named objects.
Storage APIs accept descriptor entries. storage_file retains them, and root_tfile_imp writes them as TNamed objects in a TList. Tests cover storage and ROOT write behavior.
Descriptor planning and finalization form/persistence/persistence_writer.*, test/form/form_basics_test.cpp
The persistence writer tracks planned technologies, validates technology and file plans, and writes layout-version and technology metadata during finalization. Tests cover metadata output and validation errors.
Retrying a rejected container batch can cause finalization to fail. The change is otherwise mergeable with this bounded risk noted.
Pre-merge checks: 4 · 1
Failed checks: 1 warning
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Docstring Coverage
Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Documentation-only edits and deletions within survi…
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 4 passed
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Title check
The title "form: add form layout descriptor to write path" names the main change: a per-file layout descriptor is added and written during finalize. The changeset adds descriptor constants, a write_de…
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The title "form: add form layout descriptor to write path" names the main change: a per-file layout descriptor is added and written during finalize. The changeset adds descriptor constants, a write_descriptor path through storage and ROOT file classes, and finalize-time descriptor writing with technology validation. The title is specific and matches the PR objectives. It omits the validation rules, which is acceptable for a title.
Full details: Docstring Coverage
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Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 8 functions across 12 files.
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Write docstrings for the functions missing them to satisfy the coverage threshold.
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Actionable comments posted: 2
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Inline comments:
Review comments at @form/persistence/persistence_writer.cpp:
- Line 108: Stage technology entries locally instead of updating
planned_technologies_ as each placement is processed, then merge the staged
entries into planned_technologies_ only after create_containers succeeds. Ensure
a failed batch leaves the writer’s existing technology plan unchanged so a
corrected retry can proceed.
Review comments at @test/form/form_storage_test.cpp:
- Around line 550-551: Update the test around root_tfile_imp and
write_descriptor(entries) to reopen form_descriptor_ok.root, read back
form_descriptor, and assert it contains the expected TNamed key and value.
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Commits
Reviewing files that changed from the base of the PR and between 9397fdd and 2c8c51a.
Files selected for processing: 12
form/persistence/descriptor.hpp
form/persistence/persistence_writer.cpp
form/persistence/persistence_writer.hpp
form/root_storage/root_tfile.cpp
form/root_storage/root_tfile.hpp
form/storage/istorage.hpp
form/storage/storage_file.cpp
form/storage/storage_file.hpp
form/storage/storage_writer.cpp
form/storage/storage_writer.hpp
test/form/form_basics_test.cpp
test/form/form_storage_test.cpp
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Applicability reference: AGENTS.md: # Phlex — Kilo Agent Instructions **Authoritative sources**: `.clang-format` and `.clang-tidy` are the ground truth for formatting and naming.
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Right. The original implementation used SetOwner(true) and new TNamed, but clang-tidy flagged the implicit ownership transfer. The current implementation uses a std::vector<TNamed> to manage lifetimes explicitly and avoid raw new.
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What is the advantage of storing a TList here since a std::vector<std::pair<std::string, std::string>> can be stored directly into a TFile (both with and without an explicit dictionary for that vector instance)?
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I tested this with ROOT 6.40.02. std::vector<std::pair<std::string, std::string>> requires a generated dictionary for writing, while TList works out of the box. More importantly, TList supports generic inspection through ROOT tools because it derives from TObject; an STL vector does not. Although std::map<std::string, std::string> also works without an explicit dictionary, inspecting it requires knowing its exact type. For a bootstrap descriptor, generic inspectability is useful, so I think TList is a reasonable choice for now.
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Fair points. In ROOT 6.40.02, WriteObject fails without a compiled CollectionProxy, even in an interpreted macro. A generated dictionary would solve this, but adds an extra dependency library and runtime rootmap resolution.
You're also right that I overstated the inspection advantage. TList mainly offers the convenience of generic TObject::Print().
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A generated dictionary would solve this, but adds an extra dependency library and runtime rootmap resolution.
Don't you already have dictionaries for other things? Independently adding a dictionary does not have add a library; it can be part of an existing library. The rootmap is not integral to a framework uses as it is more useful for the autoloading of the library and autoparsing the header files (and are also tiny files, so I am not sure what the concern is).
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Summary
Add a per-file layout descriptor to the FORM write path, recording
form_layout_versionandtechnologies.This provides the foundation for future readers to identify the file layout and support files written by earlier FORM versions, without relying on configuration to determine the storage technologies.
The descriptor is written at finalize and uses a backend-specific representation, independent of the container machinery.
Reader support and backward compatibility are not implemented in this PR.
1.0) and the technologies used in that file.TListofTNamedobjects in ROOT.