gEventAction.cc

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#include "gEventAction.h"
#include "../gactionConventions.h"
 
// geant4
#include "G4Event.hh"
#include "G4Threading.hh"
 
// c++
#include <string>
 
// gemc
#include "event/gEventDataCollection.h"
#include "../generator/gPrimaryGeneratorAction.h"
#include "../tracking/gTrackProvenance.h"
 
// c++
#include <algorithm>
#include <cctype>
#include <chrono>
#include <sstream>
#include <unordered_set>
 
namespace {
GGeneratedParticleBank make_generated_particle_bank(const GParticleRecordEvent& particles) {
    GGeneratedParticleBank bank;
    bank.reserve(particles.size());
 
    for (const auto& particle : particles) {
        bank.push_back({
            particle.name,
            particle.pid,
            particle.type,
            particle.multiplicity,
            particle.p,
            particle.theta,
            particle.phi,
            particle.vx,
            particle.vy,
            particle.vz
        });
    }
 
    return bank;
}
 
GAncestorBank make_ancestor_bank(const std::vector<GTrackRecord>& records) {
    GAncestorBank bank;
    bank.reserve(records.size());
    for (const auto& record : records) {
        bank.push_back({
            record.pid,
            record.tid,
            record.mtid,
            record.kinetic_energy,
            record.momentum.x(),
            record.momentum.y(),
            record.momentum.z(),
            record.vertex.x(),
            record.vertex.y(),
            record.vertex.z()
        });
    }
    return bank;
}
 
bool scalar_bool_option_enabled(const std::shared_ptr<GOptions>& goptions, const std::string& name) {
    std::string value = goptions->getScalarString(name);
    std::transform(value.begin(), value.end(), value.begin(),
                   [](unsigned char c) { return static_cast<char>(std::tolower(c)); });
    return value == "true" || value == "1" || value == "yes" || value == "on";
}
 
// Match a detector against an option containing comma- or whitespace-separated names.
bool detector_is_listed(const std::shared_ptr<GOptions>& goptions, const std::string& option,
                        const std::string& detector) {
    std::string detectors = goptions->getScalarString(option);
    std::replace(detectors.begin(), detectors.end(), ',', ' ');
 
    std::istringstream names(detectors);
    std::string        name;
    while (names >> name) {
        if (name == "all" || name == detector) return true;
    }
    return false;
}
 
// Convert a substring to a non-negative integer, returning false on any malformed input.
bool to_non_negative_int(const std::string& text, int& out) {
    if (text.empty()) return false;
    size_t pos = 0;
    int    value;
    try { value = std::stoi(text, &pos); }
    catch (...) { return false; }
    if (pos != text.size() || value < 0) return false;
    out = value;
    return true;
}
}
 
 
// Construct the event action and keep access to shared configuration plus the
// non-owning thread-local run action used during event finalization.
GEventAction::GEventAction(const std::shared_ptr<GOptions>& gopt, GRunAction* run_a,
                           std::shared_ptr<GTrackProvenance> provenance) :
    GBase(gopt, EVENTACTION_LOGGER),
    goptions(gopt),
    run_action(run_a),
    track_provenance(std::move(provenance)) {
    const auto thread_id = G4Threading::G4GetThreadId();
    const auto desc      = "GEventAction " + std::to_string(thread_id);
    log->debug(CONSTRUCTOR, FUNCTION_NAME, desc);
    save_all_ancestors  = goptions->getSwitch(SAVE_ALL_ANCESTORS_SWITCH);
    save_original_track = goptions->getSwitch(SAVE_ORIGINAL_TRACK_SWITCH) || save_all_ancestors;
 
    // Parse the log_every option of the form N or N-NTH. Anything malformed disables the
    // feature and is reported once (from thread 0) to avoid duplicated warnings across workers.
    std::string spec = goptions->getScalarString(LOG_EVERY_OPTION);
    if (!spec.empty() && spec != UNINITIALIZEDSTRINGQUANTITY) {
        const auto dash = spec.find('-');
        std::string n_part   = dash == std::string::npos ? spec : spec.substr(0, dash);
        std::string nth_part = dash == std::string::npos ? std::string() : spec.substr(dash + 1);
 
        // Effective worker-thread count, mirroring gemc::get_nthreads clamping (0 means all cores).
        int nthreads = goptions->getScalarInt("nthreads");
        const int ncores = G4Threading::G4GetNumberOfCores();
        if (nthreads == 0 || nthreads > ncores) nthreads = ncores;
 
        int n = 0;
        if (!to_non_negative_int(n_part, n) || n == 0) {
            if (thread_id <= 0)
                log->warning("Ignoring invalid -", LOG_EVERY_OPTION, "=", spec,
                             " : N must be a positive integer.");
        }
        else if (dash != std::string::npos) {
            int nth = 0;
            if (!to_non_negative_int(nth_part, nth) || nth >= nthreads) {
                if (thread_id <= 0)
                    log->warning("Ignoring invalid -", LOG_EVERY_OPTION, "=", spec,
                                 " : thread id must be in [0, ", nthreads - 1, "].");
            }
            else {
                log_every_n      = n;
                log_every_thread = nth;
            }
        }
        else { log_every_n = n; }
    }
}
 
// Print the periodic "Starting event" line, honoring the log module and optional thread filter.
// The reported event number, count and rate are all per worker thread: each enabled thread logs
// every N events it processes, showing its own 1-based event count and average rate (events / second).
void GEventAction::log_event_start(int thread_id) {
    if (log_every_n <= 0) return;
    if (log_every_thread >= 0 && log_every_thread != thread_id) return;
 
    // Anchor this thread's clock on its first counted event, then count this event.
    const auto now = std::chrono::steady_clock::now();
    if (log_events_seen == 0) { log_start_time = now; }
    ++log_events_seen;
 
    if (log_events_seen % log_every_n != 0) return;
 
    const double elapsed_s = std::chrono::duration<double>(now - log_start_time).count();
    const double rate      = elapsed_s > 0.0 ? static_cast<double>(log_events_seen) / elapsed_s : 0.0;
 
    // log_events_seen is this thread's own 1-based count, not the global Geant4 event id.
    log->info(0, "Starting event n. ", log_events_seen, " in thread ", thread_id,
              ". Average rate: ", rate, " events / second");
}
 
// Begin-of-event hook used mainly for tracing event and thread identifiers.
void GEventAction::BeginOfEventAction([[maybe_unused]] const G4Event* event) {
    const auto thread_id = G4Threading::G4GetThreadId();
    const auto event_id  = event->GetEventID();
 
    log->debug(NORMAL, FUNCTION_NAME, " event id ", event_id, " in thread ", thread_id);
    if (track_provenance != nullptr) { track_provenance->clear(); }
 
    log_event_start(thread_id);
}
 
// Finalize the event by reading hit collections, digitizing them, routing the
// resulting payload according to collection mode, and publishing event-mode output.
void GEventAction::EndOfEventAction([[maybe_unused]] const G4Event* event) {
    if (run_action == nullptr) {
        log->error(ERR_GRUNACTION_NOT_EXISTING, FUNCTION_NAME,
                   " run_action is null - cannot access digitization routines or streamers.");
        return;
    }
 
    // Count each processed event once, even when it produces no payload.
    run_action->increment_run_events_processed();
 
    const auto thread_id = G4Threading::G4GetThreadId();
    const auto event_id  = event->GetEventID();
 
    auto gevent_header       = std::make_unique<GEventHeader>(goptions, event_id, thread_id);
    auto eventDataCollection = std::make_shared<GEventDataCollection>(goptions, std::move(gevent_header));
    eventDataCollection->setGeneratedParticles(
        make_generated_particle_bank(GPrimaryGeneratorAction::currentGeneratedParticleRecords()));
    eventDataCollection->setGeneratedTrackedParticles(
        make_generated_particle_bank(GPrimaryGeneratorAction::currentGeneratedTrackedParticleRecords()));
 
    auto* const hcs_this_event = event->GetHCofThisEvent();
    if (hcs_this_event == nullptr) {
        if (!eventDataCollection->getGeneratedParticles().empty() ||
            !eventDataCollection->getGeneratedTrackedParticles().empty()) {
            publish_event_data(eventDataCollection);
        }
        return;
    }
 
    const auto digi_map = run_action->get_digitization_routines_map();
    if (digi_map == nullptr) {
        log->error(ERR_GDIGIMAP_NOT_EXISTING, FUNCTION_NAME,
                   " no digitization routines map available in thread ", thread_id);
        return;
    }
 
    bool has_event_mode_payload = false;
    bool has_run_mode_payload   = false;
    const bool also_reject_true_info = scalar_bool_option_enabled(goptions, "also_reject_true_info");
    std::unordered_set<int> ancestor_track_ids;
 
    // Loop over every hit collection produced during this event and dispatch each
    // collection to the digitization routine registered under its collection name.
    for (G4int hci = 0; hci < hcs_this_event->GetNumberOfCollections(); ++hci) {
        auto* const this_ghc = static_cast<GHitsCollection*>(hcs_this_event->GetHC(hci));
        if (this_ghc == nullptr) {
            continue;
        }
 
        const std::string hcSDName = this_ghc->GetSDname();
        const bool no_digitized = detector_is_listed(goptions, NO_DIGITIZED_OPTION, hcSDName);
        const bool no_true_info = detector_is_listed(goptions, NO_TRUE_INFO_OPTION, hcSDName);
 
        log->info(2, FUNCTION_NAME, " worker ", thread_id,
                  " for event number ", event_id,
                  " for collection number ", hci + 1,
                  " collection name: ", hcSDName);
 
        // Resolve the digitization routine responsible for this collection.
        const auto it = digi_map->find(hcSDName);
        if (it == digi_map->end()) {
            log->error(ERR_GDIGIMAP_NOT_EXISTING, FUNCTION_NAME,
                       " no digitization routine registered for collection ", hcSDName,
                       " in thread ", thread_id);
            continue;
        }
 
        const auto& digitization_routine = it->second;
        if (digitization_routine == nullptr) {
            log->error(ERR_GDIGIMAP_NOT_EXISTING, FUNCTION_NAME,
                       " digitization routine is null for collection ", hcSDName,
                       " in thread ", thread_id);
            continue;
        }
 
        const auto collection_mode = digitization_routine->collection_mode();
        size_t accepted_hit_index = 0;
 
        // Process all hits in the collection. Event-mode digitizers append to the
        // event container, while run-mode digitizers append to the run container.
        for (size_t hitIndex = 0; hitIndex < this_ghc->GetSize(); ++hitIndex) {
 
            auto* const this_hit = static_cast<GHit*>(this_ghc->GetHit(hitIndex));
            if (this_hit == nullptr) {
                continue;
            }
            if (save_all_ancestors) {
                const auto track_ids = this_hit->getTids();
                ancestor_track_ids.insert(track_ids.begin(), track_ids.end());
            }
 
            auto digi_data = no_digitized ? nullptr : digitization_routine->digitizeHit(this_hit, hitIndex);
            bool hit_accepted = digi_data != nullptr;
 
            // Apply post-digitization threshold and efficiency policies. Plugins may declare a
            // policy intrinsic or leave it controlled by -applyThresholds / -applyInefficiencies.
            // Both are evaluated so the detector's random-number sequence remains stable.
            if (hit_accepted) {
                const bool skip_threshold  = digitization_routine->apply_thresholds(this_hit, digi_data.get());
                const bool skip_efficiency = digitization_routine->apply_efficiency(this_hit, digi_data.get());
                if (skip_threshold || skip_efficiency) {
                    digi_data.reset();
                    hit_accepted = false;
                }
            }
 
            if (collection_mode == CollectionMode::event) {
                if (hit_accepted) {
                    ++accepted_hit_index;
                    digi_data->includeVariable("hitn", static_cast<int>(accepted_hit_index));
                    run_action->record_analysis_digitized(hcSDName, *digi_data);
                    eventDataCollection->addDetectorDigitizedData(hcSDName, std::move(digi_data));
                    has_event_mode_payload = true;
                }
            }
            else if (collection_mode == CollectionMode::run) {
                if (hit_accepted) {
                    run_action->record_analysis_digitized(hcSDName, *digi_data);
                    run_action->collect_event_data_collections(
                        hcSDName,
                        std::move(digi_data));
                    has_run_mode_payload = true;
                }
            }
 
            // Event output already requires true information. In GUI analysis mode, request it for
            // run-mode plugins too so their runtime-defined variables can be discovered without an API schema.
            const bool collect_true = !no_true_info &&
                (no_digitized || hit_accepted || !also_reject_true_info) &&
                (collection_mode == CollectionMode::event || run_action->analysis_enabled());
            if (collect_true) {
                const size_t output_hit_index = collection_mode == CollectionMode::event && hit_accepted
                    ? accepted_hit_index : hitIndex + 1;
                auto true_data = digitization_routine->collectTrueInformation(this_hit, output_hit_index);
                if (save_original_track && track_provenance != nullptr && true_data != nullptr) {
                    const int           tid = this_hit->getTid();
                    const G4ThreeVector op  = track_provenance->originalTrackMomentum(tid);
                    true_data->includeVariable("otid", track_provenance->originalTrackId(tid));
                    true_data->includeVariable("opid", track_provenance->originalTrackPid(tid));
                    true_data->includeVariable("opx", op.getX());
                    true_data->includeVariable("opy", op.getY());
                    true_data->includeVariable("opz", op.getZ());
                }
                if (true_data != nullptr) { run_action->record_analysis_true(hcSDName, *true_data); }
                if (collection_mode == CollectionMode::event) {
                    eventDataCollection->addDetectorTrueInfoData(hcSDName, std::move(true_data));
                    has_event_mode_payload = true;
                }
            }
        }
    }
 
    if (save_all_ancestors && track_provenance != nullptr) {
        eventDataCollection->setAncestors(
            make_ancestor_bank(track_provenance->ancestorsForTracks(ancestor_track_ids)));
    }
 
    // Record whether this event contributed at least one run-mode payload entry.
    if (has_run_mode_payload) {
        run_action->increment_run_events_with_payload();
    }
 
    // Publish event-mode output once, after all collections have been processed.
    if (has_event_mode_payload ||
        !eventDataCollection->getAncestors().empty() ||
        !eventDataCollection->getGeneratedParticles().empty() ||
        !eventDataCollection->getGeneratedTrackedParticles().empty()) {
        publish_event_data(eventDataCollection);
    }
}
 
// Send the completed event-data object to every configured worker-thread streamer.
void GEventAction::publish_event_data(const std::shared_ptr<GEventDataCollection>& event_data) const {
    if (run_action == nullptr || event_data == nullptr) {
        return;
    }
 
    if (!run_action->has_streamer_threads_map()) {
        return;
    }
 
    const auto gstreamers_threads_map = run_action->get_streamer_threads_map();
    if (gstreamers_threads_map == nullptr) {
        log->error(ERR_STREAMERMAP_NOT_EXISTING, FUNCTION_NAME,
                   " no thread streamer map available - event will not be published.");
        return;
    }
 
    for (const auto& [name, gstreamer] : *gstreamers_threads_map) {
        if (gstreamer == nullptr) {
            log->error(ERR_STREAMERMAP_NOT_EXISTING, FUNCTION_NAME,
                       " null gstreamer instance for streamer ", name);
            continue;
        }
 
        gstreamer->publishEventData(event_data);
    }
}