feat(eventbus): add platform runtimes and benchmarks

Add the Entities NativeQueue adapter, standalone .NET runtime and source generator, reproducible smoke coverage, and Unity benchmark assets for EventBus 2.0.
2026-08-26 01:17:39 +08:00
parent ad5a7b68a3
commit 724e0bc8d8
32 changed files with 1813 additions and 0 deletions
@@ -0,0 +1,11 @@
+# ShrinkEventBus for .NET
+
+- `ShrinkEventBus.Core`：`netstandard2.1` ValueTask 运行时，不引用 UnityEngine 或 UniTask。
+- `ShrinkEventBus.Generator`：Roslyn incremental generator，为 `partial` 普通 C# subscriber 生成强类型绑定。
+- `ShrinkEventBus.Smoke`：`net8.0` 烟测，覆盖多 Bus 隔离、Inline 和 DedicatedThread。
+
+```bash
+dotnet build DotNet/ShrinkEventBus.Core/ShrinkEventBus.Core.csproj -c Release
+dotnet build DotNet/ShrinkEventBus.Generator/ShrinkEventBus.Generator.csproj -c Release
+dotnet run --project DotNet/ShrinkEventBus.Smoke/ShrinkEventBus.Smoke.csproj -c Release
+```
@@ -0,0 +1,205 @@
+#nullable enable
+
+using System;
+using System.Collections.Concurrent;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace ShrinkEventBus
+{
+    internal interface IDotNetScheduler : IDisposable
+    {
+        bool IsOnSchedulerThread { get; }
+        bool TryPost(Action action);
+        ValueTask PostAsync(Func<ValueTask> action, CancellationToken cancellationToken);
+    }
+
+    internal sealed class QueueFullException : InvalidOperationException { }
+
+    internal static class DotNetSchedulerFactory
+    {
+        public static IDotNetScheduler Create(string name, ShrinkBusOptions options)
+        {
+            return options.Scheduler switch
+            {
+                ShrinkBusSchedulerKind.MainThread => new SynchronizationContextScheduler(options),
+                ShrinkBusSchedulerKind.DedicatedThread => new DedicatedScheduler(name, options),
+                ShrinkBusSchedulerKind.TaskPool => new TaskPoolScheduler(options),
+                _ => new InlineScheduler()
+            };
+        }
+    }
+
+    internal sealed class InlineScheduler : IDotNetScheduler
+    {
+        public bool IsOnSchedulerThread => true;
+        public bool TryPost(Action action) { action(); return true; }
+        public ValueTask PostAsync(Func<ValueTask> action, CancellationToken cancellationToken)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            return action();
+        }
+        public void Dispose() { }
+    }
+
+    internal sealed class SynchronizationContextScheduler : IDotNetScheduler
+    {
+        private readonly SynchronizationContext _context;
+        private readonly int _threadId;
+        private int _disposed;
+
+        public SynchronizationContextScheduler(ShrinkBusOptions options)
+        {
+            _context = SynchronizationContext.Current ?? throw new InvalidOperationException(
+                "MainThread scheduler requires a current SynchronizationContext in a pure .NET host.");
+            _threadId = Thread.CurrentThread.ManagedThreadId;
+        }
+
+        public bool IsOnSchedulerThread => Thread.CurrentThread.ManagedThreadId == _threadId;
+
+        public bool TryPost(Action action)
+        {
+            if (Volatile.Read(ref _disposed) != 0)
+                return false;
+            if (IsOnSchedulerThread)
+                action();
+            else
+                _context.Post(_ => action(), null);
+            return true;
+        }
+
+        public ValueTask PostAsync(Func<ValueTask> action, CancellationToken cancellationToken)
+        {
+            if (IsOnSchedulerThread)
+                return action();
+            return new ValueTask(PostCoreAsync(action, cancellationToken));
+        }
+
+        private Task PostCoreAsync(Func<ValueTask> action, CancellationToken cancellationToken)
+        {
+            var completion = new TaskCompletionSource<bool>(TaskCreationOptions.RunContinuationsAsynchronously);
+            _context.Post(async _ =>
+            {
+                try { cancellationToken.ThrowIfCancellationRequested(); await action(); completion.SetResult(true); }
+                catch (OperationCanceledException) { completion.SetCanceled(); }
+                catch (Exception ex) { completion.SetException(ex); }
+            }, null);
+            return completion.Task;
+        }
+
+        public void Dispose() => Interlocked.Exchange(ref _disposed, 1);
+    }
+
+    internal sealed class TaskPoolScheduler : IDotNetScheduler
+    {
+        private readonly SemaphoreSlim _concurrency;
+        private readonly int _capacity;
+        private int _pending;
+        private int _disposed;
+
+        public TaskPoolScheduler(ShrinkBusOptions options)
+        {
+            var concurrency = options.DispatchMode == ShrinkDispatchMode.Ordered ? 1 : options.MaxConcurrency;
+            _concurrency = new SemaphoreSlim(concurrency, concurrency);
+            _capacity = options.QueueCapacity;
+        }
+
+        public bool IsOnSchedulerThread => false;
+
+        public bool TryPost(Action action)
+        {
+            if (Volatile.Read(ref _disposed) != 0 || Interlocked.Increment(ref _pending) > _capacity)
+            {
+                Interlocked.Decrement(ref _pending);
+                return false;
+            }
+            _ = Task.Run(async () =>
+            {
+                await _concurrency.WaitAsync().ConfigureAwait(false);
+                try { action(); }
+                finally { _concurrency.Release(); Interlocked.Decrement(ref _pending); }
+            });
+            return true;
+        }
+
+        public async ValueTask PostAsync(Func<ValueTask> action, CancellationToken cancellationToken)
+        {
+            if (Volatile.Read(ref _disposed) != 0 || Interlocked.Increment(ref _pending) > _capacity)
+            {
+                Interlocked.Decrement(ref _pending);
+                throw new QueueFullException();
+            }
+            await _concurrency.WaitAsync(cancellationToken).ConfigureAwait(false);
+            try { await action().ConfigureAwait(false); }
+            finally { _concurrency.Release(); Interlocked.Decrement(ref _pending); }
+        }
+
+        public void Dispose()
+        {
+            Interlocked.Exchange(ref _disposed, 1);
+            _concurrency.Dispose();
+        }
+    }
+
+    internal sealed class DedicatedScheduler : IDotNetScheduler
+    {
+        private sealed class Work
+        {
+            public Func<ValueTask> Action = null!;
+            public TaskCompletionSource<bool>? Completion;
+        }
+
+        private readonly BlockingCollection<Work> _queue;
+        private readonly Thread _thread;
+        private int _threadId;
+        private int _disposed;
+
+        public DedicatedScheduler(string name, ShrinkBusOptions options)
+        {
+            _queue = new BlockingCollection<Work>(options.QueueCapacity);
+            _thread = new Thread(Run) { IsBackground = true, Name = $"ShrinkBus:{name}" };
+            _thread.Start();
+        }
+
+        public bool IsOnSchedulerThread => Thread.CurrentThread.ManagedThreadId == Volatile.Read(ref _threadId);
+
+        public bool TryPost(Action action)
+        {
+            if (IsOnSchedulerThread) { action(); return true; }
+            return Volatile.Read(ref _disposed) == 0 && _queue.TryAdd(new Work
+            {
+                Action = () => { action(); return default; }
+            });
+        }
+
+        public ValueTask PostAsync(Func<ValueTask> action, CancellationToken cancellationToken)
+        {
+            if (IsOnSchedulerThread)
+                return action();
+            var completion = new TaskCompletionSource<bool>(TaskCreationOptions.RunContinuationsAsynchronously);
+            if (Volatile.Read(ref _disposed) != 0 || !_queue.TryAdd(new Work
+                { Action = action, Completion = completion }))
+                throw new QueueFullException();
+            return new ValueTask(completion.Task);
+        }
+
+        public void Dispose()
+        {
+            if (Interlocked.Exchange(ref _disposed, 1) != 0)
+                return;
+            _queue.CompleteAdding();
+        }
+
+        private void Run()
+        {
+            Volatile.Write(ref _threadId, Thread.CurrentThread.ManagedThreadId);
+            foreach (var work in _queue.GetConsumingEnumerable())
+            {
+                try { work.Action().AsTask().GetAwaiter().GetResult(); work.Completion?.SetResult(true); }
+                catch (OperationCanceledException) { work.Completion?.SetCanceled(); }
+                catch (Exception ex) { work.Completion?.SetException(ex); }
+            }
+            _queue.Dispose();
+        }
+    }
+}
@@ -0,0 +1,16 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>netstandard2.1</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>disable</ImplicitUsings>
+    <AssemblyName>ShrinkEventBus.Core</AssemblyName>
+    <RootNamespace>ShrinkEventBus</RootNamespace>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="..\..\Assets\Modules\ShrinkEventBus\Runtime\ShrinkEventContracts.cs"
+             Link="Contracts\ShrinkEventContracts.cs" />
+    <Compile Include="..\..\Assets\Modules\ShrinkEventBus\Runtime\ShrinkEventAttributes.cs"
+             Link="Contracts\ShrinkEventAttributes.cs" />
+  </ItemGroup>
+</Project>
@@ -0,0 +1,494 @@
+#nullable enable
+
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace ShrinkEventBus
+{
+    public delegate ValueTask ShrinkAsyncEventHandler<in TEvent>(TEvent eventData,
+        CancellationToken cancellationToken) where TEvent : IShrinkEvent;
+
+    public interface IShrinkEventBus : IDisposable
+    {
+        ShrinkBusKey Key { get; }
+        ShrinkBusOptions Options { get; }
+        ShrinkPostResult Post<TEvent>(in TEvent eventData) where TEvent : IShrinkEvent;
+        ValueTask<ShrinkPostResult> PostAsync<TEvent>(TEvent eventData,
+            CancellationToken cancellationToken = default) where TEvent : IShrinkEvent;
+        IDisposable Attach(object target);
+    }
+
+    public interface IShrinkBusResolver
+    {
+        IShrinkEventBus GetBus(ShrinkBusKey key);
+        bool TryGetBus(ShrinkBusKey key, out IShrinkEventBus bus);
+    }
+
+    public interface IShrinkGeneratedSubscriber
+    {
+        IDisposable AttachGenerated(IShrinkBusResolver resolver, ShrinkBusKey? defaultBus = null);
+    }
+
+    public sealed class ShrinkEventBinding : IDisposable
+    {
+        private readonly List<IDisposable> _items = new List<IDisposable>();
+        private bool _disposed;
+
+        public void Add(IDisposable item)
+        {
+            if (item == null)
+                throw new ArgumentNullException(nameof(item));
+            if (_disposed)
+            {
+                item.Dispose();
+                throw new ObjectDisposedException(nameof(ShrinkEventBinding));
+            }
+            _items.Add(item);
+        }
+
+        public void Dispose()
+        {
+            if (_disposed)
+                return;
+            _disposed = true;
+            for (var i = _items.Count - 1; i >= 0; i--)
+                _items[i].Dispose();
+            _items.Clear();
+        }
+    }
+
+    public static class ShrinkStaticBindingRegistry
+    {
+        internal sealed class Entry
+        {
+            public long Id;
+            public ShrinkBusKey Key;
+            public Func<IShrinkBusResolver, IDisposable> Factory = null!;
+        }
+
+        private static readonly object Gate = new object();
+        private static readonly List<Entry> Entries = new List<Entry>();
+        private static readonly List<WeakReference<ShrinkEventBusHost>> Hosts =
+            new List<WeakReference<ShrinkEventBusHost>>();
+        private static long _nextId;
+
+        public static void Register(ShrinkBusKey key,
+            Func<IShrinkBusResolver, IDisposable> factory)
+        {
+            if (factory == null)
+                throw new ArgumentNullException(nameof(factory));
+
+            ShrinkEventBusHost[] hosts;
+            Entry entry;
+            lock (Gate)
+            {
+                entry = new Entry
+                {
+                    Id = Interlocked.Increment(ref _nextId),
+                    Key = key,
+                    Factory = factory
+                };
+                Entries.Add(entry);
+                hosts = LiveHostsLocked();
+            }
+
+            for (var i = 0; i < hosts.Length; i++)
+                hosts[i].TryAttachStatic(entry);
+        }
+
+        internal static void TrackHost(ShrinkEventBusHost host)
+        {
+            lock (Gate)
+            {
+                LiveHostsLocked();
+                Hosts.Add(new WeakReference<ShrinkEventBusHost>(host));
+            }
+        }
+
+        internal static Entry[] GetEntries(ShrinkBusKey key)
+        {
+            lock (Gate)
+                return Entries.FindAll(item => item.Key == key).ToArray();
+        }
+
+        private static ShrinkEventBusHost[] LiveHostsLocked()
+        {
+            var result = new List<ShrinkEventBusHost>(Hosts.Count);
+            for (var i = Hosts.Count - 1; i >= 0; i--)
+            {
+                if (Hosts[i].TryGetTarget(out var host))
+                    result.Add(host);
+                else
+                    Hosts.RemoveAt(i);
+            }
+            return result.ToArray();
+        }
+    }
+
+    public sealed class ShrinkEventBusHost : IShrinkBusResolver, IDisposable
+    {
+        private readonly ConcurrentDictionary<ShrinkBusKey, IShrinkEventBus> _buses =
+            new ConcurrentDictionary<ShrinkBusKey, IShrinkEventBus>();
+        private readonly object _staticGate = new object();
+        private readonly Dictionary<long, IDisposable> _staticBindings =
+            new Dictionary<long, IDisposable>();
+        private bool _disposed;
+
+        public ShrinkEventBusHost()
+        {
+            ShrinkStaticBindingRegistry.TrackHost(this);
+        }
+
+        public IShrinkEventBus CreateBus(ShrinkBusKey key, ShrinkBusOptions options)
+        {
+            if (_disposed)
+                throw new ObjectDisposedException(nameof(ShrinkEventBusHost));
+            var bus = new DotNetShrinkEventBus(key, options);
+            if (!_buses.TryAdd(key, bus))
+            {
+                bus.Dispose();
+                throw new InvalidOperationException($"Bus '{key}' is already registered.");
+            }
+            var entries = ShrinkStaticBindingRegistry.GetEntries(key);
+            for (var i = 0; i < entries.Length; i++)
+                TryAttachStatic(entries[i]);
+            return bus;
+        }
+
+        public IShrinkEventBus GetBus(ShrinkBusKey key)
+        {
+            if (_buses.TryGetValue(key, out var bus))
+                return bus;
+            throw new KeyNotFoundException($"Bus '{key}' is not registered.");
+        }
+
+        public bool TryGetBus(ShrinkBusKey key, out IShrinkEventBus bus) =>
+            _buses.TryGetValue(key, out bus!);
+
+        public IDisposable Attach(object target, ShrinkBusKey? defaultBus = null)
+        {
+            if (target is not IShrinkGeneratedSubscriber generated)
+                throw new InvalidOperationException(
+                    $"Type {target?.GetType().FullName ?? "<null>"} has no generated event binding.");
+            return generated.AttachGenerated(this, defaultBus);
+        }
+
+        public void Dispose()
+        {
+            if (_disposed)
+                return;
+            _disposed = true;
+            lock (_staticGate)
+            {
+                foreach (var binding in _staticBindings.Values)
+                    binding.Dispose();
+                _staticBindings.Clear();
+            }
+            foreach (var bus in _buses.Values)
+                bus.Dispose();
+            _buses.Clear();
+        }
+
+        internal void TryAttachStatic(ShrinkStaticBindingRegistry.Entry entry)
+        {
+            lock (_staticGate)
+            {
+                if (_disposed || _staticBindings.ContainsKey(entry.Id) || !_buses.ContainsKey(entry.Key))
+                    return;
+                _staticBindings.Add(entry.Id, entry.Factory(this));
+            }
+        }
+    }
+
+    public static class ShrinkGeneratedBinding
+    {
+        public static IDisposable Subscribe<TEvent>(IShrinkBusResolver resolver, ShrinkBusKey? defaultBus,
+            string? configuredBus, object? owner, Action<TEvent> handler, ShrinkEventPriority priority,
+            int numericPriority, bool receiveCanceled) where TEvent : IShrinkEvent
+        {
+            return Resolve(resolver, defaultBus, configuredBus).Subscribe(
+                owner, handler, priority, numericPriority, receiveCanceled);
+        }
+
+        public static IDisposable SubscribeAsync<TEvent>(IShrinkBusResolver resolver, ShrinkBusKey? defaultBus,
+            string? configuredBus, object? owner, ShrinkAsyncEventHandler<TEvent> handler,
+            ShrinkEventPriority priority, int numericPriority, bool receiveCanceled) where TEvent : IShrinkEvent
+        {
+            return Resolve(resolver, defaultBus, configuredBus).SubscribeAsync(
+                owner, handler, priority, numericPriority, receiveCanceled);
+        }
+
+        private static DotNetShrinkEventBus Resolve(IShrinkBusResolver resolver, ShrinkBusKey? defaultBus,
+            string? configuredBus)
+        {
+            var key = string.IsNullOrWhiteSpace(configuredBus)
+                ? defaultBus ?? ShrinkBusKey.Game
+                : ShrinkBusKey.Parse(configuredBus);
+            return resolver.GetBus(key) as DotNetShrinkEventBus
+                ?? throw new InvalidOperationException("Generated bindings require the built-in bus implementation.");
+        }
+    }
+
+    internal sealed class DotNetShrinkEventBus : IShrinkEventBus
+    {
+        private readonly ConcurrentDictionary<Type, IEventChannel> _channels =
+            new ConcurrentDictionary<Type, IEventChannel>();
+        private readonly IDotNetScheduler _scheduler;
+        private long _nextSubscriptionId;
+        private bool _disposed;
+
+        public DotNetShrinkEventBus(ShrinkBusKey key, ShrinkBusOptions options)
+        {
+            Key = key;
+            Options = (options ?? throw new ArgumentNullException(nameof(options))).CloneValidated();
+            _scheduler = DotNetSchedulerFactory.Create(key.Id, Options);
+        }
+
+        public ShrinkBusKey Key { get; }
+        public ShrinkBusOptions Options { get; }
+
+        public ShrinkPostResult Post<TEvent>(in TEvent eventData) where TEvent : IShrinkEvent
+        {
+            if (_disposed)
+                return ShrinkPostResult.Rejected(ShrinkPostFailure.BusStopped);
+            var copied = eventData;
+            if (_scheduler.IsOnSchedulerThread)
+                return Channel<TEvent>().Post(copied);
+
+            return _scheduler.TryPost(() => Channel<TEvent>().Post(copied))
+                ? new ShrinkPostResult(true, false, false)
+                : ShrinkPostResult.Rejected(ShrinkPostFailure.QueueFull);
+        }
+
+        public async ValueTask<ShrinkPostResult> PostAsync<TEvent>(TEvent eventData,
+            CancellationToken cancellationToken = default) where TEvent : IShrinkEvent
+        {
+            if (_disposed)
+                return ShrinkPostResult.Rejected(ShrinkPostFailure.BusStopped);
+            ShrinkPostResult result = default;
+            try
+            {
+                await _scheduler.PostAsync(async () =>
+                {
+                    result = await Channel<TEvent>().PostAsync(eventData, Options.DispatchMode, cancellationToken)
+                        .ConfigureAwait(false);
+                }, cancellationToken).ConfigureAwait(false);
+                return result;
+            }
+            catch (QueueFullException)
+            {
+                return ShrinkPostResult.Rejected(ShrinkPostFailure.QueueFull);
+            }
+            catch (OperationCanceledException) when (cancellationToken.IsCancellationRequested)
+            {
+                return new ShrinkPostResult(true, false, false, ShrinkPostFailure.Canceled);
+            }
+        }
+
+        public IDisposable Attach(object target)
+        {
+            if (target is not IShrinkGeneratedSubscriber generated)
+                throw new InvalidOperationException(
+                    $"Type {target?.GetType().FullName ?? "<null>"} has no generated event binding.");
+            return generated.AttachGenerated(new SingleBusResolver(this), Key);
+        }
+
+        public IDisposable Subscribe<TEvent>(object? owner, Action<TEvent> handler,
+            ShrinkEventPriority priority, int numericPriority, bool receiveCanceled) where TEvent : IShrinkEvent
+        {
+            return Channel<TEvent>().Add(Interlocked.Increment(ref _nextSubscriptionId), owner,
+                handler, null, priority, numericPriority, receiveCanceled);
+        }
+
+        public IDisposable SubscribeAsync<TEvent>(object? owner, ShrinkAsyncEventHandler<TEvent> handler,
+            ShrinkEventPriority priority, int numericPriority, bool receiveCanceled) where TEvent : IShrinkEvent
+        {
+            return Channel<TEvent>().Add(Interlocked.Increment(ref _nextSubscriptionId), owner,
+                null, handler, priority, numericPriority, receiveCanceled);
+        }
+
+        public void Dispose()
+        {
+            if (_disposed)
+                return;
+            _disposed = true;
+            _scheduler.Dispose();
+            foreach (var channel in _channels.Values)
+                channel.Clear();
+            _channels.Clear();
+        }
+
+        private EventChannel<TEvent> Channel<TEvent>() where TEvent : IShrinkEvent =>
+            (EventChannel<TEvent>)_channels.GetOrAdd(typeof(TEvent), _ => new EventChannel<TEvent>());
+
+        private sealed class SingleBusResolver : IShrinkBusResolver
+        {
+            private readonly IShrinkEventBus _bus;
+            public SingleBusResolver(IShrinkEventBus bus) => _bus = bus;
+            public IShrinkEventBus GetBus(ShrinkBusKey key) => key == _bus.Key
+                ? _bus
+                : throw new KeyNotFoundException($"Bus '{key}' is not available.");
+            public bool TryGetBus(ShrinkBusKey key, out IShrinkEventBus bus)
+            {
+                bus = _bus;
+                return key == _bus.Key;
+            }
+        }
+    }
+
+    internal interface IEventChannel
+    {
+        void Clear();
+    }
+
+    internal sealed class EventChannel<TEvent> : IEventChannel where TEvent : IShrinkEvent
+    {
+        private sealed class Entry
+        {
+            public long Id = 0;
+            public object? Owner;
+            public Action<TEvent>? Sync;
+            public ShrinkAsyncEventHandler<TEvent>? Async;
+            public ShrinkEventPriority Priority;
+            public int NumericPriority;
+            public bool ReceiveCanceled;
+        }
+
+        private readonly object _gate = new object();
+        private readonly List<Entry> _entries = new List<Entry>();
+        private Entry[] _snapshot = Array.Empty<Entry>();
+
+        public IDisposable Add(long id, object? owner, Action<TEvent>? sync,
+            ShrinkAsyncEventHandler<TEvent>? asyncHandler, ShrinkEventPriority priority,
+            int numericPriority, bool receiveCanceled)
+        {
+            lock (_gate)
+            {
+                _entries.Add(new Entry
+                {
+                    Id = id,
+                    Owner = owner,
+                    Sync = sync,
+                    Async = asyncHandler,
+                    Priority = priority,
+                    NumericPriority = numericPriority,
+                    ReceiveCanceled = receiveCanceled
+                });
+                Rebuild();
+            }
+            return new Subscription(this, id);
+        }
+
+        public ShrinkPostResult Post(TEvent eventData)
+        {
+            var handled = false;
+            var snapshot = _snapshot;
+            for (var i = 0; i < snapshot.Length; i++)
+            {
+                var entry = snapshot[i];
+                if (IsCanceled(eventData) && !entry.ReceiveCanceled)
+                    continue;
+                if (entry.Sync != null)
+                    entry.Sync(eventData);
+                else if (entry.Async != null)
+                    _ = entry.Async(eventData, CancellationToken.None).AsTask();
+                else
+                    continue;
+                handled = true;
+            }
+            return ShrinkPostResult.Completed(handled, IsCanceled(eventData));
+        }
+
+        public async ValueTask<ShrinkPostResult> PostAsync(TEvent eventData, ShrinkDispatchMode mode,
+            CancellationToken cancellationToken)
+        {
+            var handled = false;
+            var snapshot = _snapshot;
+            if (mode == ShrinkDispatchMode.Parallel)
+            {
+                var tasks = new List<Task>();
+                for (var i = 0; i < snapshot.Length; i++)
+                {
+                    var entry = snapshot[i];
+                    if (IsCanceled(eventData) && !entry.ReceiveCanceled)
+                        continue;
+                    if (entry.Sync != null)
+                        entry.Sync(eventData);
+                    else if (entry.Async != null)
+                        tasks.Add(entry.Async(eventData, cancellationToken).AsTask());
+                    else
+                        continue;
+                    handled = true;
+                }
+                if (tasks.Count > 0)
+                    await Task.WhenAll(tasks).ConfigureAwait(false);
+            }
+            else
+            {
+                for (var i = 0; i < snapshot.Length; i++)
+                {
+                    cancellationToken.ThrowIfCancellationRequested();
+                    var entry = snapshot[i];
+                    if (IsCanceled(eventData) && !entry.ReceiveCanceled)
+                        continue;
+                    if (entry.Sync != null)
+                        entry.Sync(eventData);
+                    else if (entry.Async != null)
+                        await entry.Async(eventData, cancellationToken).ConfigureAwait(false);
+                    else
+                        continue;
+                    handled = true;
+                }
+            }
+            return ShrinkPostResult.Completed(handled, IsCanceled(eventData));
+        }
+
+        public void Clear()
+        {
+            lock (_gate)
+            {
+                _entries.Clear();
+                _snapshot = Array.Empty<Entry>();
+            }
+        }
+
+        private void Remove(long id)
+        {
+            lock (_gate)
+            {
+                _entries.RemoveAll(item => item.Id == id);
+                Rebuild();
+            }
+        }
+
+        private void Rebuild()
+        {
+            _entries.Sort((left, right) =>
+            {
+                var leftValue = left.NumericPriority == 0 ? (int)left.Priority * 1000 : -left.NumericPriority;
+                var rightValue = right.NumericPriority == 0 ? (int)right.Priority * 1000 : -right.NumericPriority;
+                var result = leftValue.CompareTo(rightValue);
+                return result != 0 ? result : left.Id.CompareTo(right.Id);
+            });
+            _snapshot = _entries.ToArray();
+        }
+
+        private static bool IsCanceled(TEvent value) =>
+            value is IShrinkCancelableEvent cancelable && cancelable.IsCanceled;
+
+        private sealed class Subscription : IDisposable
+        {
+            private EventChannel<TEvent>? _owner;
+            private readonly long _id;
+            public Subscription(EventChannel<TEvent> owner, long id)
+            {
+                _owner = owner;
+                _id = id;
+            }
+            public void Dispose() => Interlocked.Exchange(ref _owner, null)?.Remove(_id);
+        }
+    }
+}
@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>disable</ImplicitUsings>
+    <AssemblyName>ShrinkEventBus.Generator</AssemblyName>
+    <RootNamespace>ShrinkEventBus.Generator</RootNamespace>
+    <IncludeBuildOutput>false</IncludeBuildOutput>
+    <NoWarn>$(NoWarn);RS2008</NoWarn>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.1" PrivateAssets="all" />
+  </ItemGroup>
+</Project>
@@ -0,0 +1,309 @@
+#nullable enable
+
+using System;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Linq;
+using System.Text;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+using Microsoft.CodeAnalysis.Text;
+
+namespace ShrinkEventBus.Generator
+{
+    [Generator]
+    public sealed class ShrinkEventBusGenerator : IIncrementalGenerator
+    {
+        private const string SubscriberAttribute = "ShrinkEventBus.ShrinkEventSubscriberAttribute";
+        private const string SubscribeAttribute = "ShrinkEventBus.ShrinkSubscribeAttribute";
+
+        private static readonly DiagnosticDescriptor PartialRequired = new DiagnosticDescriptor(
+            "SHRINKEVENT001", "Subscriber must be partial",
+            "Subscriber type '{0}' must be partial so ShrinkEventBus can generate a reflection-free binding",
+            "ShrinkEventBus", DiagnosticSeverity.Error, true);
+
+        private static readonly DiagnosticDescriptor UnsupportedHandler = new DiagnosticDescriptor(
+            "SHRINKEVENT002", "Unsupported handler signature",
+            "Handler '{0}' must be void(TEvent), UniTask(TEvent), UniTask(TEvent, CancellationToken), or ValueTask(TEvent, CancellationToken)",
+            "ShrinkEventBus", DiagnosticSeverity.Error, true);
+
+        private static readonly DiagnosticDescriptor TopLevelRequired = new DiagnosticDescriptor(
+            "SHRINKEVENT003", "Top-level subscriber required",
+            "Subscriber type '{0}' must be top-level in the current generator version",
+            "ShrinkEventBus", DiagnosticSeverity.Error, true);
+
+        public void Initialize(IncrementalGeneratorInitializationContext context)
+        {
+            context.RegisterSourceOutput(context.CompilationProvider,
+                static (sourceContext, compilation) =>
+                {
+                    if (compilation.GetTypeByMetadataName(
+                            "System.Runtime.CompilerServices.ModuleInitializerAttribute") == null)
+                    {
+                        sourceContext.AddSource("ShrinkEventBus.ModuleInitializerAttribute.g.cs",
+                            SourceText.From(
+                                "namespace System.Runtime.CompilerServices { [global::System.AttributeUsage(global::System.AttributeTargets.Method, Inherited = false)] internal sealed class ModuleInitializerAttribute : global::System.Attribute { } }",
+                                Encoding.UTF8));
+                    }
+                });
+
+            var candidates = context.SyntaxProvider.ForAttributeWithMetadataName(
+                SubscriberAttribute,
+                static (node, _) => node is ClassDeclarationSyntax,
+                static (syntaxContext, _) => (INamedTypeSymbol)syntaxContext.TargetSymbol);
+
+            context.RegisterSourceOutput(candidates.Collect(), Generate);
+        }
+
+        private static void Generate(SourceProductionContext context,
+            ImmutableArray<INamedTypeSymbol> candidates)
+        {
+            foreach (var type in candidates)
+                GenerateType(context, type);
+        }
+
+        private static void GenerateType(SourceProductionContext context, INamedTypeSymbol type)
+        {
+            if (type.ContainingType != null)
+            {
+                context.ReportDiagnostic(Diagnostic.Create(TopLevelRequired,
+                    type.Locations.FirstOrDefault(), type.ToDisplayString()));
+                return;
+            }
+
+            var isPartial = type.DeclaringSyntaxReferences
+                .Select(reference => reference.GetSyntax())
+                .OfType<ClassDeclarationSyntax>()
+                .Any(declaration => declaration.Modifiers.Any(SyntaxKind.PartialKeyword));
+            if (!isPartial)
+            {
+                context.ReportDiagnostic(Diagnostic.Create(PartialRequired,
+                    type.Locations.FirstOrDefault(), type.ToDisplayString()));
+                return;
+            }
+
+            var handlers = new List<HandlerModel>();
+            foreach (var method in type.GetMembers().OfType<IMethodSymbol>())
+            {
+                var attribute = method.GetAttributes().FirstOrDefault(item =>
+                    item.AttributeClass?.ToDisplayString() == SubscribeAttribute);
+                if (attribute == null)
+                    continue;
+
+                if (!TryCreateHandler(method, attribute, type.IsStatic, out var handler))
+                {
+                    context.ReportDiagnostic(Diagnostic.Create(UnsupportedHandler,
+                        method.Locations.FirstOrDefault(), method.ToDisplayString()));
+                    continue;
+                }
+                handlers.Add(handler);
+            }
+
+            var subscriber = type.GetAttributes().First(item =>
+                item.AttributeClass?.ToDisplayString() == SubscriberAttribute);
+            var defaultBus = ReadString(subscriber, "DefaultBus");
+            var source = type.IsStatic
+                ? BuildStaticSource(type, handlers, defaultBus)
+                : BuildSource(type, handlers, defaultBus);
+            var hint = type.ToDisplayString().Replace('.', '_').Replace('+', '_') + ".ShrinkEvents.g.cs";
+            context.AddSource(hint, SourceText.From(source, Encoding.UTF8));
+        }
+
+        private static bool TryCreateHandler(IMethodSymbol method, AttributeData attribute,
+            bool staticSubscriber,
+            out HandlerModel model)
+        {
+            model = default;
+            if (method.IsStatic != staticSubscriber || method.Parameters.Length == 0 || method.Parameters.Length > 2)
+                return false;
+
+            var eventType = method.Parameters[0].Type.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat);
+            var returnType = method.ReturnType.ToDisplayString();
+            var isSync = method.ReturnsVoid && method.Parameters.Length == 1;
+            var isValueTask = returnType == "System.Threading.Tasks.ValueTask" &&
+                              method.Parameters.Length == 2 &&
+                              method.Parameters[1].Type.ToDisplayString() == "System.Threading.CancellationToken";
+            var isUniTask = returnType == "Cysharp.Threading.Tasks.UniTask";
+            var isUniTaskLegacy = isUniTask && method.Parameters.Length == 1;
+            var isUniTaskCancelable = isUniTask && method.Parameters.Length == 2 &&
+                                      method.Parameters[1].Type.ToDisplayString() == "System.Threading.CancellationToken";
+            if (!isSync && !isValueTask && !isUniTaskLegacy && !isUniTaskCancelable)
+                return false;
+
+            var bindingMethod = isSync
+                ? "Subscribe"
+                : isUniTaskLegacy ? "SubscribeAsyncLegacy" : "SubscribeAsync";
+
+            model = new HandlerModel(
+                method.Name,
+                eventType,
+                bindingMethod,
+                ReadString(attribute, "Bus"),
+                ReadInt(attribute, "Priority", 2),
+                ReadInt(attribute, "NumericPriority", 0),
+                ReadBool(attribute, "ReceiveCanceled", false));
+            return true;
+        }
+
+        private static string BuildSource(INamedTypeSymbol type, IReadOnlyList<HandlerModel> handlers,
+            string defaultBus)
+        {
+            var builder = new StringBuilder();
+            builder.AppendLine("// <auto-generated />");
+            builder.AppendLine("#nullable enable");
+            if (!type.ContainingNamespace.IsGlobalNamespace)
+            {
+                builder.Append("namespace ").Append(type.ContainingNamespace.ToDisplayString()).AppendLine();
+                builder.AppendLine("{");
+            }
+
+            var accessibility = type.DeclaredAccessibility switch
+            {
+                Accessibility.Public => "public ",
+                Accessibility.Internal => "internal ",
+                _ => string.Empty
+            };
+            builder.Append("    ").Append(accessibility).Append("partial class ")
+                .Append(type.Name).AppendLine(" : global::ShrinkEventBus.IShrinkGeneratedSubscriber");
+            builder.AppendLine("    {");
+            builder.AppendLine("        global::System.IDisposable global::ShrinkEventBus.IShrinkGeneratedSubscriber.AttachGenerated(");
+            builder.AppendLine("            global::ShrinkEventBus.IShrinkBusResolver resolver,");
+            builder.AppendLine("            global::ShrinkEventBus.ShrinkBusKey? defaultBus)");
+            builder.AppendLine("        {");
+            builder.AppendLine("            var binding = new global::ShrinkEventBus.ShrinkEventBinding();");
+
+            foreach (var handler in handlers)
+            {
+                var bus = string.IsNullOrWhiteSpace(handler.Bus) ? defaultBus : handler.Bus;
+                builder.Append("            binding.Add(global::ShrinkEventBus.ShrinkGeneratedBinding.")
+                    .Append(handler.BindingMethod).Append('<').Append(handler.EventType).AppendLine(">(");
+                builder.Append("                resolver, defaultBus, ")
+                    .Append(ToLiteral(bus)).AppendLine(", this,");
+                builder.Append("                this.").Append(handler.MethodName)
+                    .Append(", (global::ShrinkEventBus.ShrinkEventPriority)")
+                    .Append(handler.Priority).Append(", ").Append(handler.NumericPriority).Append(", ")
+                    .Append(handler.ReceiveCanceled ? "true" : "false").AppendLine("));");
+            }
+
+            builder.AppendLine("            return binding;");
+            builder.AppendLine("        }");
+            builder.AppendLine("    }");
+            if (!type.ContainingNamespace.IsGlobalNamespace)
+                builder.AppendLine("}");
+            return builder.ToString();
+        }
+
+        private static string BuildStaticSource(INamedTypeSymbol type,
+            IReadOnlyList<HandlerModel> handlers, string defaultBus)
+        {
+            var builder = new StringBuilder();
+            builder.AppendLine("// <auto-generated />");
+            builder.AppendLine("#nullable enable");
+            if (!type.ContainingNamespace.IsGlobalNamespace)
+            {
+                builder.Append("namespace ").Append(type.ContainingNamespace.ToDisplayString()).AppendLine();
+                builder.AppendLine("{");
+            }
+
+            var accessibility = type.DeclaredAccessibility switch
+            {
+                Accessibility.Public => "public ",
+                Accessibility.Internal => "internal ",
+                _ => string.Empty
+            };
+            builder.Append("    ").Append(accessibility).Append("static partial class ")
+                .Append(type.Name).AppendLine();
+            builder.AppendLine("    {");
+            builder.AppendLine("        [global::System.Runtime.CompilerServices.ModuleInitializer]");
+            builder.AppendLine("        internal static void ShrinkEventBus_RegisterStaticBindings()");
+            builder.AppendLine("        {");
+            for (var i = 0; i < handlers.Count; i++)
+            {
+                var bus = string.IsNullOrWhiteSpace(handlers[i].Bus) ? defaultBus : handlers[i].Bus;
+                builder.Append("            global::ShrinkEventBus.ShrinkStaticBindingRegistry.Register(")
+                    .Append("global::ShrinkEventBus.ShrinkBusKey.Parse(")
+                    .Append(ToLiteral(bus)).Append("), ShrinkEventBus_Bind_").Append(i).AppendLine(");");
+            }
+            builder.AppendLine("        }");
+
+            for (var i = 0; i < handlers.Count; i++)
+            {
+                var handler = handlers[i];
+                var bus = string.IsNullOrWhiteSpace(handler.Bus) ? defaultBus : handler.Bus;
+                builder.Append("        private static global::System.IDisposable ShrinkEventBus_Bind_")
+                    .Append(i).AppendLine("(global::ShrinkEventBus.IShrinkBusResolver resolver)");
+                builder.AppendLine("        {");
+                builder.Append("            return global::ShrinkEventBus.ShrinkGeneratedBinding.")
+                    .Append(handler.BindingMethod).Append('<').Append(handler.EventType).AppendLine(">(");
+                builder.Append("                resolver, null, ").Append(ToLiteral(bus))
+                    .AppendLine(", null,");
+                builder.Append("                ").Append(handler.MethodName)
+                    .Append(", (global::ShrinkEventBus.ShrinkEventPriority)")
+                    .Append(handler.Priority).Append(", ").Append(handler.NumericPriority).Append(", ")
+                    .Append(handler.ReceiveCanceled ? "true" : "false").AppendLine(");");
+                builder.AppendLine("        }");
+            }
+
+            builder.AppendLine("    }");
+            if (!type.ContainingNamespace.IsGlobalNamespace)
+                builder.AppendLine("}");
+            return builder.ToString();
+        }
+
+        private static string ReadString(AttributeData attribute, string name)
+        {
+            foreach (var pair in attribute.NamedArguments)
+            {
+                if (pair.Key == name)
+                    return pair.Value.Value as string ?? string.Empty;
+            }
+            return string.Empty;
+        }
+
+        private static int ReadInt(AttributeData attribute, string name, int defaultValue)
+        {
+            foreach (var pair in attribute.NamedArguments)
+            {
+                if (pair.Key == name && pair.Value.Value != null)
+                    return Convert.ToInt32(pair.Value.Value);
+            }
+            return defaultValue;
+        }
+
+        private static bool ReadBool(AttributeData attribute, string name, bool defaultValue)
+        {
+            foreach (var pair in attribute.NamedArguments)
+            {
+                if (pair.Key == name && pair.Value.Value is bool value)
+                    return value;
+            }
+            return defaultValue;
+        }
+
+        private static string ToLiteral(string value) => SymbolDisplay.FormatLiteral(value ?? string.Empty, true);
+
+        private readonly struct HandlerModel
+        {
+            public HandlerModel(string methodName, string eventType, string bindingMethod, string bus,
+                int priority, int numericPriority, bool receiveCanceled)
+            {
+                MethodName = methodName;
+                EventType = eventType;
+                BindingMethod = bindingMethod;
+                Bus = bus;
+                Priority = priority;
+                NumericPriority = numericPriority;
+                ReceiveCanceled = receiveCanceled;
+            }
+
+            public string MethodName { get; }
+            public string EventType { get; }
+            public string BindingMethod { get; }
+            public string Bus { get; }
+            public int Priority { get; }
+            public int NumericPriority { get; }
+            public bool ReceiveCanceled { get; }
+        }
+    }
+}
@@ -0,0 +1,62 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using ShrinkEventBus;
+
+internal readonly struct PingEvent : IShrinkEvent
+{
+    public PingEvent(int value) => Value = value;
+    public int Value { get; }
+}
+
+[ShrinkEventSubscriber]
+internal sealed partial class SmokeSubscriber
+{
+    public int Sum { get; private set; }
+    public int ThreadId { get; private set; }
+
+    [ShrinkSubscribe]
+    private void OnPing(PingEvent evt)
+    {
+        Sum += evt.Value;
+        ThreadId = Thread.CurrentThread.ManagedThreadId;
+    }
+}
+
+[ShrinkEventSubscriber(DefaultBus = "game")]
+internal static partial class StaticSmokeSubscriber
+{
+    public static int Sum { get; set; }
+
+    [ShrinkSubscribe]
+    private static void OnPing(PingEvent evt) => Sum += evt.Value;
+}
+
+internal static class Program
+{
+    private static async Task<int> Main()
+    {
+        using var host = new ShrinkEventBusHost();
+        var game = host.CreateBus(ShrinkBusKey.Game, ShrinkBusOptions.Inline());
+        var workerKey = new ShrinkBusKey("worker", "smoke");
+        var worker = host.CreateBus(workerKey, ShrinkBusOptions.DedicatedThread());
+        var gameSubscriber = new SmokeSubscriber();
+        var workerSubscriber = new SmokeSubscriber();
+        var callerThread = Thread.CurrentThread.ManagedThreadId;
+
+        using var gameBinding = host.Attach(gameSubscriber, ShrinkBusKey.Game);
+        using var workerBinding = host.Attach(workerSubscriber, workerKey);
+        game.Post(new PingEvent(2));
+        await worker.PostAsync(new PingEvent(3));
+
+        if (gameSubscriber.Sum != 2 || workerSubscriber.Sum != 3 || StaticSmokeSubscriber.Sum != 2 ||
+            workerSubscriber.ThreadId == callerThread)
+        {
+            Console.Error.WriteLine("FAIL");
+            return 1;
+        }
+
+        Console.WriteLine("PASS");
+        return 0;
+    }
+}
@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>disable</ImplicitUsings>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\ShrinkEventBus.Core\ShrinkEventBus.Core.csproj" />
+    <ProjectReference Include="..\ShrinkEventBus.Generator\ShrinkEventBus.Generator.csproj"
+                      OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
+  </ItemGroup>
+</Project>