reduce AsyncTrigger allocation

src/UniTask.NetCoreSandbox/Program.cs

@@ -15,6 +15,55 @@ using System.Reactive.Concurrency;
 
 namespace NetCoreSandbox
 {
+    public class Text
+    {
+
+        public string text { get; set; }
+    }
+
+    public static partial class UnityUIComponentExtensions
+    {
+        public static void BindTo(this IUniTaskAsyncEnumerable<string> source, Text text)
+        {
+            AAAACORECORE(source, text).Forget();
+
+            async UniTaskVoid AAAACORECORE(IUniTaskAsyncEnumerable<string> source2, Text text2)
+            {
+                var e = source2.GetAsyncEnumerator();
+                try
+                {
+                    while (await e.MoveNextAsync())
+                    {
+                        text2.text = e.Current;
+                        // action(e.Current);
+                    }
+                }
+                finally
+                {
+                    if (e != null)
+                    {
+                        await e.DisposeAsync();
+                    }
+                }
+            }
+        }
+
+        //public static IDisposable SubscribeToText<T>(this IObservable<T> source, Text text)
+        //{
+        //    return source.SubscribeWithState(text, (x, t) => t.text = x.ToString());
+        //}
+
+        //public static IDisposable SubscribeToText<T>(this IObservable<T> source, Text text, Func<T, string> selector)
+        //{
+        //    return source.SubscribeWithState2(text, selector, (x, t, s) => t.text = s(x));
+        //}
+
+        //public static IDisposable SubscribeToInteractable(this IObservable<bool> source, Selectable selectable)
+        //{
+        //    return source.SubscribeWithState(selectable, (x, s) => s.interactable = x);
+        //}
+    }
+
     class Program
     {
         static string FlattenGenArgs(Type type)

src/UniTask/Assets/Plugins/UniTask/Runtime/Triggers/AsyncAwakeTrigger.cs

@@ -19,56 +19,13 @@ namespace Cysharp.Threading.Tasks.Triggers
     }
 
     [DisallowMultipleComponent]
-    public class AsyncAwakeTrigger : MonoBehaviour
+    public sealed class AsyncAwakeTrigger : AsyncTriggerBase<AsyncUnit>
     {
-        bool called = false;
-        TriggerEvent<AsyncUnit> triggerEvent;
-
-        void Awake()
-        {
-            called = true;
-            triggerEvent?.TrySetResult(AsyncUnit.Default);
-            triggerEvent = null;
-        }
-
         public UniTask AwakeAsync()
         {
-            if (called) return UniTask.CompletedTask;
+            if (calledAwake) return UniTask.CompletedTask;
 
-            PlayerLoopHelper.AddAction(PlayerLoopTiming.Update, new AwakeMonitor(this));
-
-            if (triggerEvent == null)
-            {
-                triggerEvent = new TriggerEvent<AsyncUnit>();
-            }
-
-            return ((IAsyncOneShotTrigger)new AsyncTriggerHandler<AsyncUnit>(triggerEvent, true)).OneShotAsync();
-        }
-
-        private void OnDestroy()
-        {
-            triggerEvent?.TrySetCanceled(CancellationToken.None);
-        }
-
-        class AwakeMonitor : IPlayerLoopItem
-        {
-            readonly AsyncAwakeTrigger trigger;
-
-            public AwakeMonitor(AsyncAwakeTrigger trigger)
-            {
-                this.trigger = trigger;
-            }
-
-            public bool MoveNext()
-            {
-                if (trigger.called) return false;
-                if (trigger == null)
-                {
-                    trigger.OnDestroy();
-                    return false;
-                }
-                return true;
-            }
+            return ((IAsyncOneShotTrigger)new AsyncTriggerHandler<AsyncUnit>(this, true)).OneShotAsync();
         }
     }
 }

src/UniTask/Assets/Plugins/UniTask/Runtime/Triggers/AsyncDestroyTrigger.cs

@@ -19,11 +19,10 @@ namespace Cysharp.Threading.Tasks.Triggers
     }
 
     [DisallowMultipleComponent]
-    public class AsyncDestroyTrigger : MonoBehaviour
+    public sealed class AsyncDestroyTrigger : MonoBehaviour
     {
         bool awakeCalled = false;
         bool called = false;
-        TriggerEvent<AsyncUnit> triggerEvent;
         CancellationTokenSource cancellationTokenSource;
 
         public CancellationToken CancellationToken
@@ -34,6 +33,12 @@ namespace Cysharp.Threading.Tasks.Triggers
                 {
                     cancellationTokenSource = new CancellationTokenSource();
                 }
+
+                if (!awakeCalled)
+                {
+                    PlayerLoopHelper.AddAction(PlayerLoopTiming.Update, new AwakeMonitor(this));
+                }
+
                 return cancellationTokenSource.Token;
             }
         }
@@ -47,28 +52,24 @@ namespace Cysharp.Threading.Tasks.Triggers
         {
             called = true;
 
-            triggerEvent?.TrySetResult(AsyncUnit.Default);
             cancellationTokenSource?.Cancel();
             cancellationTokenSource?.Dispose();
-
-            triggerEvent = null;
         }
 
         public UniTask OnDestroyAsync()
         {
             if (called) return UniTask.CompletedTask;
 
-            if (!awakeCalled)
-            {
-                PlayerLoopHelper.AddAction(PlayerLoopTiming.Update, new AwakeMonitor(this));
-            }
+            var tcs = new UniTaskCompletionSource();
 
-            if (triggerEvent == null)
+            // OnDestroy = Called Cancel.
+            CancellationToken.RegisterWithoutCaptureExecutionContext(state =>
             {
-                triggerEvent = new TriggerEvent<AsyncUnit>();
-            }
+                var tcs2 = (UniTaskCompletionSource)state;
+                tcs2.TrySetResult();
+            }, tcs);
 
-            return ((IAsyncOneShotTrigger)new AsyncTriggerHandler<AsyncUnit>(triggerEvent, true)).OneShotAsync();
+            return tcs.Task;
         }
 
         class AwakeMonitor : IPlayerLoopItem

src/UniTask/Assets/Plugins/UniTask/Runtime/Triggers/AsyncStartTrigger.cs

@@ -1,6 +1,5 @@
 #pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
 
-using System.Threading;
 using UnityEngine;
 
 namespace Cysharp.Threading.Tasks.Triggers
@@ -19,67 +18,21 @@ namespace Cysharp.Threading.Tasks.Triggers
     }
 
     [DisallowMultipleComponent]
-    public class AsyncStartTrigger : MonoBehaviour
+    public sealed class AsyncStartTrigger : AsyncTriggerBase<AsyncUnit>
     {
-        bool awakeCalled = false;
-        bool called = false;
-        TriggerEvent<AsyncUnit> triggerEvent;
-
-        void Awake()
-        {
-            awakeCalled = true;
-        }
+        bool called;
 
         void Start()
         {
             called = true;
-            triggerEvent?.TrySetResult(AsyncUnit.Default);
-            triggerEvent = null;
+            RaiseEvent(AsyncUnit.Default);
         }
 
         public UniTask StartAsync()
         {
             if (called) return UniTask.CompletedTask;
 
-            if (!awakeCalled)
-            {
-                PlayerLoopHelper.AddAction(PlayerLoopTiming.Update, new AwakeMonitor(this));
-            }
-
-            if (triggerEvent == null)
-            {
-                triggerEvent = new TriggerEvent<AsyncUnit>();
-            }
-
-            return ((IAsyncOneShotTrigger)new AsyncTriggerHandler<AsyncUnit>(triggerEvent, true)).OneShotAsync();
-        }
-
-        private void OnDestroy()
-        {
-            triggerEvent?.TrySetCanceled(CancellationToken.None);
-        }
-
-        class AwakeMonitor : IPlayerLoopItem
-        {
-            readonly AsyncStartTrigger trigger;
-
-            public AwakeMonitor(AsyncStartTrigger trigger)
-            {
-                this.trigger = trigger;
-            }
-
-            public bool MoveNext()
-            {
-                if (trigger.called) return false;
-                if (trigger == null)
-                {
-                    trigger.OnDestroy();
-                    return false;
-                }
-                return true;
-            }
+            return ((IAsyncOneShotTrigger)new AsyncTriggerHandler<AsyncUnit>(this, true)).OneShotAsync();
         }
     }
-
-}
-
+}

src/UniTask/Assets/Plugins/UniTask/Runtime/Triggers/AsyncTriggerBase.cs

@@ -10,67 +10,67 @@ namespace Cysharp.Threading.Tasks.Triggers
 {
     public abstract class AsyncTriggerBase<T> : MonoBehaviour, IUniTaskAsyncEnumerable<T>
     {
-        protected TriggerEvent<T> triggerEvent;
+        TriggerEvent<T> triggerEvent;
 
-        bool calledAwake;
-        bool calledDestroy;
-        ICancelPromise triggerSlot;
+        internal protected bool calledAwake;
+        internal protected bool calledDestroy;
 
         void Awake()
         {
             calledAwake = true;
         }
 
-        protected TriggerEvent<T> GetTriggerEvent()
-        {
-            if (triggerEvent == null)
-            {
-                triggerEvent = new TriggerEvent<T>();
-                if (triggerSlot == null)
-                {
-                    triggerSlot = triggerEvent;
-                }
-                else
-                {
-                    throw new InvalidOperationException("triggerSlot is already filled.");
-                }
-            }
-
-            if (!calledAwake)
-            {
-                PlayerLoopHelper.AddAction(PlayerLoopTiming.Update, new AwakeMonitor(this));
-            }
-
-            return triggerEvent;
-        }
-
         void OnDestroy()
         {
             if (calledDestroy) return;
             calledDestroy = true;
 
-            triggerSlot?.TrySetCanceled();
-            triggerSlot = null;
+            triggerEvent.TrySetCanceled(CancellationToken.None);
+        }
+
+        internal void AddHandler(IResolveCancelPromise<T> handler)
+        {
+            if (!calledAwake)
+            {
+                PlayerLoopHelper.AddAction(PlayerLoopTiming.Update, new AwakeMonitor(this));
+            }
+
+            triggerEvent.Add(handler);
+        }
+
+        internal void RemoveHandler(IResolveCancelPromise<T> handler)
+        {
+            if (!calledAwake)
+            {
+                PlayerLoopHelper.AddAction(PlayerLoopTiming.Update, new AwakeMonitor(this));
+            }
+
+            triggerEvent.Remove(handler);
+        }
+
+        protected void RaiseEvent(T value)
+        {
+            triggerEvent.TrySetResult(value);
         }
 
         public IUniTaskAsyncEnumerator<T> GetAsyncEnumerator(CancellationToken cancellationToken = default)
         {
-            return new AsyncTriggerEnumerator(GetTriggerEvent(), cancellationToken);
+            return new AsyncTriggerEnumerator(this, cancellationToken);
         }
 
         sealed class AsyncTriggerEnumerator : MoveNextSource, IUniTaskAsyncEnumerator<T>, IResolveCancelPromise<T>
         {
             static Action<object> cancellationCallback = CancellationCallback;
 
-            readonly TriggerEvent<T> triggerEvent;
+            readonly AsyncTriggerBase<T> parent;
             CancellationToken cancellationToken;
             CancellationTokenRegistration registration;
             bool called;
             bool isDisposed;
 
-            public AsyncTriggerEnumerator(TriggerEvent<T> triggerEvent, CancellationToken cancellationToken)
+            public AsyncTriggerEnumerator(AsyncTriggerBase<T> parent, CancellationToken cancellationToken)
             {
-                this.triggerEvent = triggerEvent;
+                this.parent = parent;
                 this.cancellationToken = cancellationToken;
             }
 
@@ -105,13 +105,13 @@ namespace Cysharp.Threading.Tasks.Triggers
                     called = true;
 
                     TaskTracker.TrackActiveTask(this, 3);
-                    triggerEvent.Add(this);
+                    parent.AddHandler(this);
                     if (cancellationToken.CanBeCanceled)
                     {
                         registration = cancellationToken.RegisterWithoutCaptureExecutionContext(cancellationCallback, this);
                     }
                 }
-                
+
                 return new UniTask<bool>(this, completionSource.Version);
             }
 
@@ -122,7 +122,7 @@ namespace Cysharp.Threading.Tasks.Triggers
                     isDisposed = true;
                     TaskTracker.RemoveTracking(this);
                     registration.Dispose();
-                    triggerEvent.Remove(this);
+                    parent.RemoveHandler(this);
                 }
 
                 return default;
@@ -169,7 +169,7 @@ namespace Cysharp.Threading.Tasks.Triggers
     {
         static Action<object> cancellationCallback = CancellationCallback;
 
-        readonly TriggerEvent<T> trigger;
+        readonly AsyncTriggerBase<T> trigger;
 
         CancellationToken cancellationToken;
         CancellationTokenRegistration registration;
@@ -180,7 +180,7 @@ namespace Cysharp.Threading.Tasks.Triggers
 
         internal CancellationToken CancellationToken => cancellationToken;
 
-        public AsyncTriggerHandler(TriggerEvent<T> trigger, bool callOnce)
+        internal AsyncTriggerHandler(AsyncTriggerBase<T> trigger, bool callOnce)
         {
             if (cancellationToken.IsCancellationRequested)
             {
@@ -193,12 +193,12 @@ namespace Cysharp.Threading.Tasks.Triggers
             this.registration = default;
             this.callOnce = callOnce;
 
-            trigger.Add(this);
+            trigger.AddHandler(this);
 
             TaskTracker.TrackActiveTask(this, 3);
         }
 
-        public AsyncTriggerHandler(TriggerEvent<T> trigger, CancellationToken cancellationToken, bool callOnce)
+        internal AsyncTriggerHandler(AsyncTriggerBase<T> trigger, CancellationToken cancellationToken, bool callOnce)
         {
             if (cancellationToken.IsCancellationRequested)
             {
@@ -210,7 +210,7 @@ namespace Cysharp.Threading.Tasks.Triggers
             this.cancellationToken = cancellationToken;
             this.callOnce = callOnce;
 
-            trigger.Add(this);
+            trigger.AddHandler(this);
 
             if (cancellationToken.CanBeCanceled)
             {
@@ -235,7 +235,7 @@ namespace Cysharp.Threading.Tasks.Triggers
                 isDisposed = true;
                 TaskTracker.RemoveTracking(this);
                 registration.Dispose();
-                trigger.Remove(this);
+                trigger.RemoveHandler(this);
             }
         }
 
@@ -285,7 +285,8 @@ namespace Cysharp.Threading.Tasks.Triggers
         }
     }
 
-    public sealed class TriggerEvent<T> : IResolveCancelPromise<T>
+    // be careful to use, itself is struct.
+    public struct TriggerEvent<T>
     {
         // optimize: many cases, handler is single.
         IResolveCancelPromise<T> singleHandler;

src/UniTask/Assets/Plugins/UniTask/Runtime/Triggers/MonoBehaviourMessagesTriggers.tt

@@ -151,27 +151,27 @@ namespace Cysharp.Threading.Tasks.Triggers
     {
         void <#= (t.handlerInterface == null) ? "" : $"{t.handlerInterface}." #><#= t.methodName #>(<#= BuildMethodArgument(t.arguments) #>)
         {
-            triggerEvent?.TrySetResult(<#= BuildResultParameter(t.arguments) #>);
+            RaiseEvent(<#= BuildResultParameter(t.arguments) #>);
         }
 
         public <#= ToInterfaceName(t.methodName) #> Get<#= t.methodName #>AsyncHandler()
         {
-            return new AsyncTriggerHandler<<#= t.returnType #>>(GetTriggerEvent(), false);
+            return new AsyncTriggerHandler<<#= t.returnType #>>(this, false);
         }
 
         public <#= ToInterfaceName(t.methodName) #> Get<#= t.methodName #>AsyncHandler(CancellationToken cancellationToken)
         {
-            return new AsyncTriggerHandler<<#= t.returnType #>>(GetTriggerEvent(), cancellationToken, false);
+            return new AsyncTriggerHandler<<#= t.returnType #>>(this, cancellationToken, false);
         }
 
         public <#= ToUniTaskName(t.returnType) #> <#= t.methodName #>Async()
         {
-            return ((<#= ToInterfaceName(t.methodName) #>)new AsyncTriggerHandler<<#= t.returnType #>>(GetTriggerEvent(), true)).<#= t.methodName #>Async();
+            return ((<#= ToInterfaceName(t.methodName) #>)new AsyncTriggerHandler<<#= t.returnType #>>(this, true)).<#= t.methodName #>Async();
         }
 
         public <#= ToUniTaskName(t.returnType) #> <#= t.methodName #>Async(CancellationToken cancellationToken)
         {
-            return ((<#= ToInterfaceName(t.methodName) #>)new AsyncTriggerHandler<<#= t.returnType #>>(GetTriggerEvent(), cancellationToken, true)).<#= t.methodName #>Async();
+            return ((<#= ToInterfaceName(t.methodName) #>)new AsyncTriggerHandler<<#= t.returnType #>>(this, cancellationToken, true)).<#= t.methodName #>Async();
         }
     }
 <# if(Is2019_3(t.triggerName)) { #>

src/UniTask/Assets/Scenes/SandboxMain.cs

@@ -37,6 +37,200 @@ public enum MyEnum
     A, B, C
 }
 
+
+
+public interface IAsyncReadOnlyReactiveProperty<T> : IUniTaskAsyncEnumerable<T>
+{
+    T Value { get; }
+}
+
+
+public interface IAsyncReactiveProperty<T> : IAsyncReadOnlyReactiveProperty<T>
+{
+    new T Value { get; set; }
+}
+
+
+[Serializable]
+public struct AsyncValueReactiveProperty<T> : IUniTaskAsyncEnumerable<T>
+{
+    TriggerEvent<T> triggerEvent;
+
+    [SerializeField]
+    T latestValue;
+
+    public T Value
+    {
+        get
+        {
+            return latestValue;
+        }
+        set
+        {
+            this.latestValue = value;
+            triggerEvent.TrySetResult(value);
+        }
+    }
+
+    public AsyncValueReactiveProperty(T value)
+    {
+        this.latestValue = value;
+        this.triggerEvent = default;
+    }
+
+    public IUniTaskAsyncEnumerator<T> GetAsyncEnumerator(CancellationToken cancellationToken)
+    {
+        return new Enumerator(triggerEvent, cancellationToken);
+    }
+
+    public class Enumerator : MoveNextSource, IUniTaskAsyncEnumerator<T>, IResolveCancelPromise<T>
+    {
+        static Action<object> cancellationCallback = CancellationCallback;
+
+        readonly TriggerEvent<T> triggerEvent;
+        readonly CancellationToken cancellationToken;
+        readonly CancellationTokenRegistration cancellationTokenRegistration;
+        T value;
+
+        public Enumerator(TriggerEvent<T> triggerEvent, CancellationToken cancellationToken)
+        {
+            this.triggerEvent = triggerEvent;
+            this.cancellationToken = cancellationToken;
+
+            triggerEvent.Add(this);
+
+            if (cancellationToken.CanBeCanceled)
+            {
+                cancellationTokenRegistration = cancellationToken.RegisterWithoutCaptureExecutionContext(cancellationCallback, this);
+            }
+        }
+
+        public T Current => value;
+
+        public UniTask<bool> MoveNextAsync()
+        {
+            completionSource.Reset();
+            return new UniTask<bool>(this, completionSource.Version);
+        }
+
+        public UniTask DisposeAsync()
+        {
+            triggerEvent.TrySetCanceled(cancellationToken);
+            triggerEvent.Remove(this);
+            return default;
+        }
+
+        public bool TrySetResult(T value)
+        {
+            this.value = value;
+            return triggerEvent.TrySetResult(value);
+        }
+
+        public bool TrySetCanceled(CancellationToken cancellationToken = default)
+        {
+            DisposeAsync().Forget();
+            return true;
+        }
+
+        static void CancellationCallback(object state)
+        {
+            var self = (Enumerator)state;
+            self.DisposeAsync().Forget();
+        }
+    }
+}
+
+
+public static partial class UnityUIComponentExtensions
+{
+    public static void BindTo(this IUniTaskAsyncEnumerable<string> source, Text text, bool rebindOnError = true)
+    {
+        BindToCore(source, text, text.GetCancellationTokenOnDestroy(), rebindOnError).Forget();
+    }
+
+    public static void BindTo(this IUniTaskAsyncEnumerable<string> source, Text text, CancellationToken cancellationToken, bool rebindOnError = true)
+    {
+        BindToCore(source, text, cancellationToken, rebindOnError).Forget();
+    }
+
+    static async UniTaskVoid BindToCore(IUniTaskAsyncEnumerable<string> source, Text text, CancellationToken cancellationToken, bool rebindOnError)
+    {
+        var repeat = false;
+        BIND_AGAIN:
+        var e = source.GetAsyncEnumerator(cancellationToken);
+        try
+        {
+            while (true)
+            {
+                bool moveNext;
+                try
+                {
+                    moveNext = await e.MoveNextAsync();
+                    repeat = false;
+                }
+                catch (Exception ex)
+                {
+                    if (ex is OperationCanceledException) return;
+
+                    if (rebindOnError && !repeat)
+                    {
+                        repeat = true;
+                        if (e != null)
+                        {
+                            await e.DisposeAsync();
+                        }
+
+                        goto BIND_AGAIN;
+                    }
+                    else
+                    {
+                        throw;
+                    }
+                }
+
+                if (!moveNext) return;
+
+                text.text = e.Current;
+            }
+        }
+        finally
+        {
+            if (e != null)
+            {
+                await e.DisposeAsync();
+            }
+        }
+    }
+
+    //public static IDisposable SubscribeToText<T>(this IObservable<T> source, Text text)
+    //{
+    //    return source.SubscribeWithState(text, (x, t) => t.text = x.ToString());
+    //}
+
+    //public static IDisposable SubscribeToText<T>(this IObservable<T> source, Text text, Func<T, string> selector)
+    //{
+    //    return source.SubscribeWithState2(text, selector, (x, t, s) => t.text = s(x));
+    //}
+
+    //public static IDisposable SubscribeToInteractable(this IObservable<bool> source, Selectable selectable)
+    //{
+    //    return source.SubscribeWithState(selectable, (x, s) => s.interactable = x);
+    //}
+}
+
+
+public static class MyClass
+{
+
+}
+
+
+
+
+
+
+
+
 public class SandboxMain : MonoBehaviour
 {
     public Button okButton;
@@ -148,16 +342,27 @@ public class SandboxMain : MonoBehaviour
         // UniTaskAsyncEnumerable.EveryUpdate(PlayerLoopTiming.FixedUpdate)
 
 
-        await UniTask.Yield(PlayerLoopTiming.Update);
-        Debug.Log("Start:" + Time.frameCount);
+        this.GetAsyncUpdateTrigger().ForEachAsync(_ =>
+        {
+            UnityEngine.Debug.Log("Update Trigger 1");
+        }).Forget();
 
-        await UniTaskAsyncEnumerable.TimerFrame(3, 5, PlayerLoopTiming.PostLateUpdate)
-            .Select(x => x)
-            .Do(x => Debug.Log("DODODO"))
-            .ForEachAsync(_ =>
-            {
-                Debug.Log("Call:" + Time.frameCount);
-            }, cancellationToken: this.GetCancellationTokenOnDestroy());
+
+        this.GetAsyncUpdateTrigger().ForEachAsync(_ =>
+        {
+            UnityEngine.Debug.Log("Update Trigger 2");
+        }).Forget();
+
+        //await UniTask.Yield(PlayerLoopTiming.Update);
+        //Debug.Log("Start:" + Time.frameCount);
+
+        //await UniTaskAsyncEnumerable.TimerFrame(3, 5, PlayerLoopTiming.PostLateUpdate)
+        //    .Select(x => x)
+        //    .Do(x => Debug.Log("DODODO"))
+        //    .ForEachAsync(_ =>
+        //    {
+        //        Debug.Log("Call:" + Time.frameCount);
+        //    }, cancellationToken: this.GetCancellationTokenOnDestroy());
 
         //try
         //{