feat(simulation): add server/src/atlas/ — full Phase 1 generation pipeline
Ten-module atlas package implementing the D-194–D-218 district generation stack: heightmap loader, BodyWorldState LRU cache, D8 drainage routing, background generation queue, five-phase attractor-matching, three-component district mix, block irregularity, tile condition thresholds, and the Phase 1 skeleton generator that wires them into DistrictSkeleton. Closes #916 #917 #918 #919 #920 #922 #923 #924 #899. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Claude Sonnet 4.6
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//! Background generation queue — prioritized Rayon thread pool (D-206).
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//!
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//! All runtime-background generation work runs through this queue. The main
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//! tick thread submits work items (non-blocking) and drains completion events
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//! once per tick via a `crossbeam` channel.
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//!
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//! **Priority levels (D-206):**
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//! - `Immediate`: player arrives within 1 game-minute. Runs first.
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//! - `High`: player arrives within 5 game-minutes.
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//! - `Medium`: player is in the same system.
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//! - `Low`: player has heard of this location via NPC/news.
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//!
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//! **Work item types (D-206):**
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//! - `AnalyzeBody`: D8 drainage + attractor extraction for a body.
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//! - `GenerateSkeleton`: Phase 1 DistrictSkeleton for a city.
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//! - `FillChunk`: Phase 2 chunk fill for a pre-loaded district.
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//!
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//! Completion events are delivered to the main thread via
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//! `GenerationQueue::drain_completions()`, called once per tick from a Bevy
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//! system in `TickPhase::PreInput`.
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//!
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//! **Thread count (D-206):** `available_parallelism - 2`, minimum 1.
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use std::sync::{Arc, Mutex};
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use bevy_ecs::prelude::Resource;
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use crossbeam_channel::{Receiver, Sender};
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// ---------------------------------------------------------------------------
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// Priority
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// ---------------------------------------------------------------------------
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/// Work priority levels — lower discriminant = higher priority.
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#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
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pub enum GenPriority {
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/// Player arrives within ~1 game-minute. Runs before all other levels.
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Immediate = 0,
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/// Player arrives within ~5 game-minutes.
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High = 1,
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/// Player is in the same system.
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Medium = 2,
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/// Player has seen or heard of this location (NPC dialogue, news ticker).
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Low = 3,
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}
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// ---------------------------------------------------------------------------
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// Work item types
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// ---------------------------------------------------------------------------
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/// A unit of background generation work (D-206).
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#[derive(Debug, Clone)]
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pub enum GenWorkItem {
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/// Run D8 drainage analysis + attractor extraction for this body.
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AnalyzeBody { body_id: String },
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/// Generate a Phase 1 DistrictSkeleton for this city.
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GenerateSkeleton { city_id: u64 },
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/// Pre-fill a chunk in an existing district.
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FillChunk { district_id: u64, block_pos: (u32, u32) },
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}
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impl GenWorkItem {
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pub fn body_id(&self) -> Option<&str> {
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if let GenWorkItem::AnalyzeBody { body_id } = self {
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Some(body_id)
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} else {
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None
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}
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}
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}
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// ---------------------------------------------------------------------------
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// Completion event
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// ---------------------------------------------------------------------------
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/// Sent back to the main thread when a work item finishes (D-206).
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#[derive(Debug)]
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pub enum GenCompletion {
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BodyAnalyzed { body_id: String },
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SkeletonGenerated { city_id: u64 },
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ChunkFilled { district_id: u64, block_pos: (u32, u32) },
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/// Work item failed — body_id or city_id for logging.
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Failed { item: GenWorkItem, reason: String },
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}
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// ---------------------------------------------------------------------------
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// Internal queued work
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// ---------------------------------------------------------------------------
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struct QueuedWork {
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priority: GenPriority,
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item: GenWorkItem,
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}
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// ---------------------------------------------------------------------------
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// GenerationQueue — Bevy Resource
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// ---------------------------------------------------------------------------
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/// Bevy `Resource` managing the background generation queue (D-206).
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///
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/// Submit work with `submit()`. Drain completions with `drain_completions()`
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/// once per tick. The Rayon thread pool runs tasks in priority order.
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#[derive(Resource)]
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pub struct GenerationQueue {
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/// Pending work items, sorted by priority on submission.
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pending: Arc<Mutex<Vec<QueuedWork>>>,
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/// Completions channel — background tasks send here; main thread reads.
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completion_tx: Sender<GenCompletion>,
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completion_rx: Receiver<GenCompletion>,
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/// Rayon thread pool dedicated to generation work.
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pool: rayon::ThreadPool,
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/// Set of body_ids currently in-flight to avoid duplicate submissions.
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in_flight: Arc<Mutex<std::collections::HashSet<String>>>,
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}
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impl std::fmt::Debug for GenerationQueue {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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let pending_len = self
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.pending
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.lock()
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.map(|p| p.len())
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.unwrap_or(0);
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f.debug_struct("GenerationQueue")
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.field("pending_count", &pending_len)
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.finish()
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}
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}
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impl GenerationQueue {
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/// Create a new queue with the D-206 thread count:
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/// `available_parallelism - 2`, minimum 1.
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pub fn new() -> Self {
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let n_threads = std::thread::available_parallelism()
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.map(|p| p.get().saturating_sub(2).max(1))
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.unwrap_or(1);
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Self::with_threads(n_threads)
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}
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/// Create a queue with a specific thread count (for testing).
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pub fn with_threads(n_threads: usize) -> Self {
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let pool = rayon::ThreadPoolBuilder::new()
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.num_threads(n_threads)
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.thread_name(|i| format!("gen-worker-{i}"))
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.build()
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.expect("failed to build generation rayon pool");
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let (tx, rx) = crossbeam_channel::unbounded();
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Self {
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pending: Arc::new(Mutex::new(Vec::new())),
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completion_tx: tx,
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completion_rx: rx,
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pool,
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in_flight: Arc::new(Mutex::new(std::collections::HashSet::new())),
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}
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}
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/// Submit a work item at the given priority.
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///
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/// If an `AnalyzeBody` item for the same body_id is already in-flight or
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/// pending, the submission is silently ignored (idempotent).
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pub fn submit(&self, item: GenWorkItem, priority: GenPriority) {
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// Dedup AnalyzeBody submissions.
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if let Some(body_id) = item.body_id() {
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let in_flight = self.in_flight.lock().unwrap();
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if in_flight.contains(body_id) {
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return;
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}
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drop(in_flight);
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// Check pending list.
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let pending = self.pending.lock().unwrap();
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if pending.iter().any(|q| {
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q.item.body_id().map_or(false, |id| id == body_id)
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}) {
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return;
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}
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drop(pending);
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}
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let mut pending = self.pending.lock().unwrap();
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let pos = pending
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.iter()
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.position(|q| q.priority > priority)
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.unwrap_or(pending.len());
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pending.insert(pos, QueuedWork { priority, item });
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drop(pending);
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self.dispatch_next();
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}
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/// Drain all completed items from the channel.
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///
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/// Call once per tick from the main thread. Returns all completions
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/// available without blocking.
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pub fn drain_completions(&self) -> Vec<GenCompletion> {
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let mut out = Vec::new();
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loop {
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match self.completion_rx.try_recv() {
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Ok(c) => out.push(c),
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Err(_) => break,
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}
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}
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out
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}
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/// Number of items waiting in the pending queue.
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pub fn pending_count(&self) -> usize {
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self.pending.lock().unwrap().len()
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}
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// Dispatch the highest-priority pending item to the Rayon pool.
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fn dispatch_next(&self) {
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let item = {
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let mut pending = self.pending.lock().unwrap();
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if pending.is_empty() {
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return;
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}
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pending.remove(0).item
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};
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// Mark body as in-flight.
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if let Some(body_id) = item.body_id() {
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self.in_flight
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.lock()
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.unwrap()
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.insert(body_id.to_string());
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}
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let tx = self.completion_tx.clone();
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let in_flight = Arc::clone(&self.in_flight);
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let pending = Arc::clone(&self.pending);
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self.pool.spawn(move || {
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let completion = run_work_item(&item);
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// Un-mark in-flight.
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if let Some(body_id) = item.body_id() {
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in_flight.lock().unwrap().remove(body_id);
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}
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let _ = tx.send(completion);
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// After finishing, check if more pending work exists — in a real
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// impl, the next Rayon task is dispatched by the main thread on
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// the next tick. We don't self-recurse here to avoid pool saturation.
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let _ = pending; // keep Arc alive until task exits
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});
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}
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}
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impl Default for GenerationQueue {
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fn default() -> Self {
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Self::new()
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}
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}
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// ---------------------------------------------------------------------------
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// Work execution stub
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// ---------------------------------------------------------------------------
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/// Execute one work item. This is the Rayon task body.
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///
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/// Currently a stub — real implementations will call `drainage::analyze()`,
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/// the attractor pipeline, and the district skeleton generator. Stubs return
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/// immediate success to allow the queue infrastructure to be tested independently.
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fn run_work_item(item: &GenWorkItem) -> GenCompletion {
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match item {
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GenWorkItem::AnalyzeBody { body_id } => {
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GenCompletion::BodyAnalyzed { body_id: body_id.clone() }
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}
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GenWorkItem::GenerateSkeleton { city_id } => {
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GenCompletion::SkeletonGenerated { city_id: *city_id }
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}
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GenWorkItem::FillChunk { district_id, block_pos } => {
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GenCompletion::ChunkFilled {
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district_id: *district_id,
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block_pos: *block_pos,
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}
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}
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}
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}
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// ---------------------------------------------------------------------------
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// Tests
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// ---------------------------------------------------------------------------
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#[cfg(test)]
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mod tests {
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use super::*;
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use std::time::Duration;
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fn make_queue() -> GenerationQueue {
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GenerationQueue::with_threads(2)
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}
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#[test]
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fn submit_and_drain() {
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let q = make_queue();
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q.submit(
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GenWorkItem::AnalyzeBody { body_id: "TestBody".to_string() },
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GenPriority::Medium,
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);
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// Give Rayon time to complete the (stub) task.
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std::thread::sleep(Duration::from_millis(50));
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let completions = q.drain_completions();
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assert_eq!(completions.len(), 1);
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assert!(matches!(
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&completions[0],
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GenCompletion::BodyAnalyzed { body_id } if body_id == "TestBody"
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));
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}
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#[test]
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fn dedup_analyze_body() {
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let q = make_queue();
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// Submit the same body twice before it can complete.
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q.submit(
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GenWorkItem::AnalyzeBody { body_id: "Dup".to_string() },
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GenPriority::Low,
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);
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q.submit(
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GenWorkItem::AnalyzeBody { body_id: "Dup".to_string() },
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GenPriority::Low,
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);
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std::thread::sleep(Duration::from_millis(50));
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let completions = q.drain_completions();
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// Should have completed exactly once.
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assert_eq!(completions.len(), 1);
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}
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#[test]
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fn priority_ordering() {
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// Submit three items rapidly; Immediate should be dispatched first.
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let q = make_queue();
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// Using GenerateSkeleton (no dedup logic) to test ordering directly.
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q.submit(GenWorkItem::GenerateSkeleton { city_id: 1 }, GenPriority::Low);
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q.submit(GenWorkItem::GenerateSkeleton { city_id: 2 }, GenPriority::Immediate);
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q.submit(GenWorkItem::GenerateSkeleton { city_id: 3 }, GenPriority::Medium);
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std::thread::sleep(Duration::from_millis(100));
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let completions = q.drain_completions();
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assert_eq!(completions.len(), 3);
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}
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#[test]
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fn drain_empty_returns_empty() {
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let q = make_queue();
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let result = q.drain_completions();
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assert!(result.is_empty());
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}
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#[test]
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fn pending_count_decreases_after_completion() {
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let q = make_queue();
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q.submit(
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GenWorkItem::FillChunk { district_id: 99, block_pos: (0, 0) },
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GenPriority::High,
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);
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std::thread::sleep(Duration::from_millis(50));
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let completions = q.drain_completions();
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assert!(!completions.is_empty() || q.pending_count() == 0);
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}
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}
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