87 lines
2.5 KiB
C#
87 lines
2.5 KiB
C#
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using System;
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using System.Runtime.CompilerServices;
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using UnityEngine;
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namespace Nullframes.Threading
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{
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public sealed partial class Dispatcher
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{
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/// <summary>
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/// Get the current instance of <see cref="Dispatcher"/>. If no instance can be found a new object is created.<br/>
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/// This property is only allowed to be accessed from the main thread!
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/// </summary>
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public static Dispatcher Current => GetOrCreateDispatcherInstance();
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/// <summary>
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/// Promises to return a valid dispatcher instance.
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/// </summary>
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/// <returns></returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static Dispatcher GetOrCreateDispatcherInstance()
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{
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if (current != null)
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{
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return current;
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}
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GuardAgainstIsNotMainThread(nameof(Current));
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#if UNITY_EDITOR
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if (!Application.isPlaying)
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{
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current = FindObjectOfType<Dispatcher>() ?? new GameObject(nameof(Dispatcher)).AddComponent<Dispatcher>();
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return current;
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}
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#endif
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current = new GameObject(nameof(Dispatcher)).AddComponent<Dispatcher>();
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return current;
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}
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private static Dispatcher current;
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/// <summary>
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/// flag to determine if an invalid operation exception should be thrown when destroying the GameObject.
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/// </summary>
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private bool _throw = true;
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private void Awake()
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{
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if (this == null)
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{
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return;
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}
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if (current != null && current != this)
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{
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Debug.LogWarning($"Multiple Dispatcher detected! Destroying {gameObject.name} Please ensure that there is only one Dispatcher in your scene!");
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_throw = false;
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Destroy(gameObject);
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return;
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}
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current = this;
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DontDestroyOnLoad(gameObject);
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gameObject.hideFlags = runtimeHideFlags;
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}
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private void OnDestroy()
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{
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if (Current != this)
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{
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return;
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}
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current = null;
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if (_throw && gameObject.scene.isLoaded)
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{
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Validate();
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throw new InvalidOperationException(
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$"{nameof(Dispatcher)} was destroyed during playmode. Please ensure that the {nameof(Dispatcher)} is not destroyed during playmode!");
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}
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}
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}
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}
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