[mesmith75]

Fixes #22

This will save time later on and be a bit more realistic.

Note this is not strictly time ordered, only approximately. Perhaps that is ok if we don't expect to get data from the detector in strict time ordering. I haven't been able to find a way to do an exact time ordering that is not computationally expensive.

Assisted by GPT-5.6 Sol and claude-sonnet-5 .

Summary by CodeRabbit

• New Features
  • Added configurable event timing with approximate and exact generation modes.
  • Event timing can now be seeded for reproducible results and derived from simulated protons-on-target (PoT).
  • Added event numbers and metadata to generated input files.
  • Added validation for file summaries, event counts, timing settings, and PoT values.
• Bug Fixes
  • File-summary PoT now takes precedence over configured values, with warnings for mismatches.
• Updates
  • The digitisation workflow now generates five events with exact timing and writes to digitised_hits_time.root.

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📝 Walkthrough

The change adds event metadata to generated input files, introduces approximate and exact event-time generators, and configures read_sim_file to provide generated times. digitise_hits now consumes those times, and the workflow selects exact generation.

Changes: Event Time Flow

Layer / File(s)	Summary
Event metadata production CMakeLists.txt, tools/make_test_input.cpp	The input writer adds event_header and event_number fields and writes a file_summary JSON object after closing the RNTuple writer. CMake adds the Boost.JSON dependency.
Event-time generator implementations src/utilities/approx_sorted_random.hpp, src/utilities/sorted_random.hpp	approx_sorted_random generates times from event indices using a beta distribution. sorted_random generates increasing times using cached binary partitions and sorted uniform samples for terminal groups. Both validate their configured inputs and event indices.
Time generation and provider wiring src/read_sim_file.cpp, CMakeLists.txt	read_sim_file validates summary data, selects PoT from the summary or configuration, reads event numbers, and selects the configured time generator. CMake adds the target’s include path and links its random-number and JSON dependencies.
Digitised time consumption and workflow settings src/digitise_hits.cpp, workflows/digitise_hits.jsonnet	digitise_hits uses the source time product and no longer generates a separate event offset. The workflow sets five entries, selects exact time generation, and changes the output filename.

Priority: ➖ Normal

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant ROOTFile
  participant read_sim_file
  participant TimeGenerator
  participant digitise_hits
  ROOTFile->>read_sim_file: provide file_summary and event_number
  read_sim_file->>TimeGenerator: generate time for event number
  TimeGenerator-->>read_sim_file: return event time
  read_sim_file->>digitise_hits: provide time product

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Suggested reviewers: olantwin

Merge Risk: 🟡 Moderate · up to 2b218

Previously supported input files can fail before processing, and invalid event metadata or PoT can cause further failures. Address these paths before merging.

Security architecture risk: 🔵 Low · up to 33ac8

The change stays within the configured simulation pipeline, and the inspected code does not establish a new privilege boundary or security vulnerability. Per-event generation avoids shared mutable timing state. Deployment exposure and framework recovery guarantees remain unverified.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — If timing configuration or event inputs are adversary-controlled, the demonstrated propagation path reaches event-time products and digitised-hit outputs in the configured job. The available evidence does not establish who can control those inputs or the maximum deployment-wide attackable scope.

Trust Boundaries and Controls

• observed — The new dependency identifies a producer within the same configured workflow through matching creator, layer and suffix selectors. The inspected registration interfaces are C++ plugin entrypoints; their public visibility does not itself establish remote reachability. Product selectors identify graph inputs rather than authenticate callers.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 44.44% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 18 functions across 7 files. (2 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly identifies the main change: generating event time offsets in order. This matches the timing-generation and ordering changes in the pull request.
Linked Issues check		Issue #22 requires saved time offsets in order. The digitisation workflow selects time_generator: 'exact'. read_sim_file maps each input event_number to sorted_random, which generates increasi…
Out of Scope Changes check		The changes that add file-summary PoT handling, event numbers, timing generators, source time propagation, and build dependencies support the ordered time-offset path for issue #22. The workflow confi…

Full details: Linked Issues check

Explanation

Issue #22 requires saved time offsets in order. The digitisation workflow selects time_generator: 'exact'. read_sim_file maps each input event_number to sorted_random, which generates increasing offsets by event number. The source publishes the offset as the time product, and digitise_hits passes that value to Digitiser. The reviewed changes satisfy the linked coding requirement.

Full details: Out of Scope Changes check

Explanation

The changes that add file-summary PoT handling, event numbers, timing generators, source time propagation, and build dependencies support the ordered time-offset path for issue #22. The workflow configuration selects that path. No unrelated change is demonstrated.

Full details: Docstring Coverage

Explanation

Docstring coverage is 44.44% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 18 functions across 7 files. (2 skipped: 2 unsupported.)

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

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Inline comments:
In `@src/read_sim_file.cpp`:
- Line 36: Update the next method to accept PhiloxRng by reference, and mark the
provider lambda capturing time_rng as mutable so uniform53 advances the captured
RNG state across calls.
- Around line 114-120: Update the provide_time callback to derive the generated
time from the data_cell_index id rather than advancing timeGenerator by callback
invocation order. Preserve the rntuple_source.time publication and serial
concurrency configuration, ensuring event indices receive deterministic
non-ascending-safe time offsets regardless of callback order.

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Inline comments:
In `@src/read_sim_file.cpp`:
- Around line 38-39: Update the offset generation around Shannon::PhiloxRng and
beta_dist so the returned offsets are monotonically ordered by event rank,
rather than independently sampled per rank. Use non-overlapping rank intervals
or generate one sample sequence and retain its sorted order, while preserving
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[mesmith75]

@olantwin Does this look ok for you?

[olantwin]

It would be good to explain the approximate time ordering somewhere and referencing e.g. a paper explaining the approach in more detail.

I'm not sure whether exact time ordering might be possible in a threadsafe way if we know the exact number of entries ahead of time.

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@mesmith75 sorry, I have no idea what happened here... I just triggered the review...

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@mesmith75 sorry, I have no idea what happened here... I just triggered the review...

I've removed coderabbits commit. Seems like interacting with coderabbit on mobile with a bad connection is dangerous...

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Inline comments:
Review comments at @src/read_sim_file.cpp:
- Line 40: Validate nToGen in the constructor initializer path before converting
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✅ clang-tidy: no new issues

[mesmith75]

Now we have two options!

[olantwin]

Merging the name fix seems to have broken everything.

Mind if I rebase this and get it to run?

I think the ordering etc. are all fine.

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Actionable comments posted: 4

🧹 Nitpick comments: 2

src/utilities/common.hpp: 1

21-21: 📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win

Mark checked_event_count as inline.

This header defines a non-template, non-inline function at namespace scope. Two translation units that include common.hpp will each emit a definition, and the link then fails with an ODR violation. Today only read_sim_file.cpp includes it. Any second consumer, such as a unit test, breaks the build.

Proposed fix

-std::uint64_t checked_event_count(double nToGen) {
+inline std::uint64_t checked_event_count(double nToGen) {

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Review comment at @src/utilities/common.hpp at line 21:
Mark the namespace-scope function checked_event_count as inline in common.hpp to
prevent multiple definitions when the header is included by multiple translation
units.

src/utilities/sorted_random.hpp: 1

63-69: 📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win

Add <array> and <algorithm> includes.

The file uses std::array and std::sort but does not include <array> or <algorithm>. It compiles today only because another header includes them indirectly. The make_cache function also uses int n_layers to compute 1 << n_layers without validation. A negative or large cacheDepth causes undefined behavior.

Based on learnings: "add the direct include" when a header relies on incidental header leakage.

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Review comment at @src/utilities/sorted_random.hpp around lines 63 - 69:
Add direct `<array>` and `<algorithm>` includes to the header for its uses of
`std::array` and `std::sort`. In `make_cache`, validate `n_layers` before
computing `1 << n_layers` so negative or oversized `cacheDepth` values cannot
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Inline comments:
Review comments at @CMakeLists.txt:
- Line 37: Move the src directory entry out of target_link_libraries and add it
to target_include_directories for read_sim_file, so the utilities/... headers
resolve through the intended include path.

Review comments at @src/read_sim_file.cpp:
- Line 58: Update the `gen->next` call to use the available `original_event_id`
field instead of the nonexistent `aegir_event_id` on `SHiP::EventHeader`.
- Line 73: Validate pot_sim with a negated inclusive range check against 1 and
nominal_pot_per_spill before calculating the time span or passing it to
generator constructors. Ensure this rejects NaN and out-of-range values before
any conversion to std::uint64_t.

Review comments at @src/utilities/approx_sorted_random.hpp:
- Around line 41-44: Update the SHiPRandom minimum version in CMakeLists.txt and
the pixi lock to a release that provides beta_dist_approx and Precision, and
avoid narrowing RNG counters: preserve k’s 64-bit type in
src/utilities/approx_sorted_random.hpp lines 41–44, and preserve node’s 64-bit
type in src/utilities/sorted_random.hpp lines 112–115 and at line 62.

---

Nitpick comments:
Review comments at @src/utilities/common.hpp:
- Line 21: Mark the namespace-scope function checked_event_count as inline in
common.hpp to prevent multiple definitions when the header is included by
multiple translation units.

Review comments at @src/utilities/sorted_random.hpp:
- Around line 63-69: Add direct `<array>` and `<algorithm>` includes to the
header for its uses of `std::array` and `std::sort`. In `make_cache`, validate
`n_layers` before computing `1 << n_layers` so negative or oversized
`cacheDepth` values cannot cause undefined behavior.

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[mesmith75]

@olantwin This looks to be good now. I think the test failures are because it is not with the latest data-model commit.

You can now select your choice of time ordering at run time.

[olantwin]

A few small comments

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Inline comments:
Review comments at @src/read_sim_file.cpp:
- Around line 122-136: Validate pot_sim immediately after selecting it from
pot_from_file or pot_from_cfg and before computing high_time or converting it
with std::llround; require a finite value in the inclusive range [1.0, 9.0e15],
throwing std::invalid_argument otherwise. Preserve the existing precedence and
subsequent event-count conversion.
- Around line 165-168: Update the event-ID reader initialization around
RNTupleReader and evt_number_view to detect the legacy SHiP::EventHeader schema
before requesting event_number. For legacy files, read and use original_event_id
without accessing aegir_event_id; preserve the existing event_number view and
processing path for newer files.

Review comments at @tools/make_test_input.cpp:
- Line 93: Validate that n_events is nonzero before creating the output file or
writing the summary, so max_event_number_saved cannot underflow from n_events -
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[mesmith75]

Now uses the file summary from ShipSoft/aegir#158