UniTaskOnDisableWrapper helps with tying UniTask execution with MonoBehaviour enabled state

UniTaskOnDisableWrapper.cs

/*
 * Copyright 2024 Marcin Swiderski
 * 
 * The MIT Licence (MIT)
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
 
using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using Cysharp.Threading.Tasks;
using UnityEngine;

public readonly struct UniTaskOnDisableWrapper
{
    private readonly MonoBehaviour _parent;
    private readonly List<Action> _disabled;

    public UniTaskOnDisableWrapper(MonoBehaviour parent, int initCapacity = 4)
    {
        _parent = parent;
        _disabled = new(initCapacity);
    }

    public AwaitContext Wrap(UniTask uniTask)
    {
        return AwaitContext.Create(_parent, _disabled, uniTask);
    }

    public void OnEnable()
    {
        foreach (Action continuation in _disabled) {
            continuation();
        }
        _disabled.Clear();
    }

    public class AwaitContext
    {
        private static readonly Stack<AwaitContext> Pool = new(64);

        private readonly Action _continuation;

        private MonoBehaviour _parent;
        private List<Action> _disabled;

        private UniTask.Awaiter _uniTaskAwaiter;
        private Action _uniTaskContinuation;

        public static AwaitContext Create(MonoBehaviour parent, List<Action> disabled, UniTask uniTask)
        {
            if (!Pool.TryPop(out AwaitContext context)) {
                context = new AwaitContext();
            }
            context.Init(parent, disabled, uniTask);
            return context;
        }

        private AwaitContext()
        {
            _continuation = OnCompleted;
        }

        private void OnCompleted()
        {
            if (_parent != null && _parent.enabled) {
                _uniTaskContinuation();
            } else {
                _disabled.Add(_uniTaskContinuation);
            }
            Deinit();
        }

        private void Init(MonoBehaviour parent, List<Action> disabled, UniTask uniTask)
        {
            _parent = parent;
            _disabled = disabled;
            _uniTaskAwaiter = uniTask.GetAwaiter();
        }

        private void Deinit()
        {
            _parent = null;
            _disabled = null;
            _uniTaskAwaiter = default;
            _uniTaskContinuation = null;

            Pool.Push(this);
        }

        public Awaiter GetAwaiter()
        {
            return new Awaiter(this);
        }

        public readonly struct Awaiter : ICriticalNotifyCompletion
        {
            private readonly AwaitContext _context;

            public Awaiter(AwaitContext context)
            {
                _context = context;
            }

            public bool IsCompleted => _context._uniTaskAwaiter.IsCompleted;

            public void GetResult()
            {
                _context._uniTaskAwaiter.GetResult();
            }

            public void OnCompleted(Action continuation)
            {
                _context._uniTaskContinuation = continuation;
                _context._uniTaskAwaiter.OnCompleted(_context._continuation);
            }

            public void UnsafeOnCompleted(Action continuation)
            {
                _context._uniTaskContinuation = continuation;
                _context._uniTaskAwaiter.OnCompleted(_context._continuation);
            }
        }
    }
}

UniTaskOnDisableWrapperExampleUsage.cs

using System.Threading;
using Cysharp.Threading.Tasks;
using UnityEngine;

public class UniTaskOnDisableWrapperExampleUsage : MonoBehaviour
{
    private UniTaskOnDisableWrapper _uniTaskOnDisable;

    private void Awake()
    {
        _uniTaskOnDisable = new UniTaskOnDisableWrapper(this);
    }

    private void Start()
    {
        _ = WorkUpdate(destroyCancellationToken);
    }

    private void OnEnable()
    {
        _uniTaskOnDisable.OnEnable();
    }

    private async UniTaskVoid WorkUpdate(CancellationToken cancel)
    {
        while (true) {
            await _uniTaskOnDisable.Wrap(UniTask.WaitForFixedUpdate(cancel));
            // Do some work
        }
    }
}