SetFilterChanged does not work?

Hello to everyone. Please explain to me why this code does not work.

Code (CSharp):

1. using Unity.Entities;
2. using UnityEngine;
3.  
4.  
5. public struct ComponentB : IComponentData
6. {
7.     public int Value;
8. }
9.  
10. public class TestUserInputSystem : ComponentSystem
11. {
12.  
13.  
14.     struct DataB
15.     {
16.         public ComponentDataArray<ComponentB> dataB;
17.         public readonly int Length;
18.         public EntityArray entity;
19.     }
20.  
21.     [Inject] DataB dataB;
22.     protected override void OnCreateManager()
23.     {
24.         Enabled = true;
25.         EntityManager.CreateEntity(typeof(ComponentB));
26.         EntityManager.CreateEntity(typeof(ComponentB));
27.     }
28.  
29.     protected override void OnUpdate()
30.     {
31.  
32.         if (Input.GetKeyDown(KeyCode.Alpha5))
33.         {
34.             ComponentB temp = dataB.dataB[0];
35.             if (temp.Value == 1) temp.Value = 0;
36.             else temp.Value = 1;
37.             dataB.dataB[0] = temp;
38.         }
39.  
40.     }
41. }
42.  
43.     [UpdateAfter(typeof(TestUserInputSystem))]
44.     public class ReactiveSystem : ComponentSystem
45.     {
46.         ComponentGroup reactiveGroup;
47.         protected override void OnCreateManager()
48.         {
49.             reactiveGroup = GetComponentGroup(typeof(ComponentB));
50.  
51.         }
52.         protected override void OnUpdate()
53.         {
54.             reactiveGroup.ResetFilter();
55.             reactiveGroup.SetFilterChanged(typeof(ComponentB));
56.             if (reactiveGroup.CalculateLength() != 0)
57.                 Debug.Log("Chenget: " + reactiveGroup.CalculateLength());
58.             reactiveGroup.SetFilterChanged(ComponentType.Create<ComponentB>());
59.             if (reactiveGroup.CalculateLength() != 0)
60.                 Debug.Log("Additive: " + reactiveGroup.CalculateLength());
61.             reactiveGroup.SetFilterChanged(ComponentType.Subtractive<ComponentB>());
62.             if (reactiveGroup.CalculateLength() != 0)
63.                 Debug.Log("Subtractive: " + reactiveGroup.CalculateLength());
64.  
65.         }
66.     }
67.  

After pressing the key , ComponentGroup reacts to the change, but SetFilterChanged does not work, because the result for all filters is the same.
SetFilterChanged does not work yet, or am I doing something wrong?

 

Maybe someone can give a link to the working code, where it is used SetFilterChanged?

 

I still do not understand, no one knows anything about this, or are they simply ignoring me?
It seems that the problem exists only for me ....

 

I think SetFilter only works for ISharedComponentData

https://github.com/Unity-Technologi...content/ecs_in_detail.md#shared-componentdata

https://github.com/Unity-Technologi...ation/content/ecs_in_detail.md#componentgroup

 

This.

But also shouldn't you be using SetFilter and not SetFilterChanged? I'm not sure if GetComponentGroup is what you want to use for your case. You might want to check other ways to inject Components in your System.

 

I need my system to work only with those components that have been changed. Initially I tried to add one more component to the entity when the desired component was changed. And in this way to determine which component was changed. But this method does not work. There are a lot of elements and constantly deleting and adding components is bad for performance.
What other ways can you identify components that have been changed?
Tell me, is it better to use EndFrameBuffer for all systems or use a separate Barrier for each system separately?

 

Pls check my thread from long long ago

https://forum.unity.com/threads/statecomponent-reactive-system.534122/