ISystemStateComponentDataのサンプル

DestroyCheckSystem.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Unity.Entities;
using Unity.Jobs;
using Unity.Mathematics;
using Unity.Collections;

public class DestroyCheckSystem : JobComponentSystem
{
    EndSimulationEntityCommandBufferSystem barrier;
    protected override void OnCreateManager()
    {
        for(int i=0; i<3; i++){
            var entity = EntityManager.CreateEntity( ComponentType.ReadWrite<MyData>());
            EntityManager.SetComponentData(entity, new MyData{ Value = 30 });
        }

        barrier = World.GetOrCreateManager<EndSimulationEntityCommandBufferSystem>();
    }

    protected override JobHandle OnUpdate(JobHandle inputDeps)
    {
        var commandBuffer = barrier.CreateCommandBuffer();
        inputDeps = new AddStateJob{ commandBuffer = commandBuffer }.Schedule(this, inputDeps);
        inputDeps = new UpdateJob{ 
            isKeyDown = Input.GetKey(KeyCode.Space),
            commandBuffer = commandBuffer }.Schedule(this, inputDeps);
        inputDeps = new DestroyEventJob{ commandBuffer = commandBuffer }.Schedule(this, inputDeps);

        barrier.AddJobHandleForProducer(inputDeps);

        return inputDeps;
    }

    [ExcludeComponent(typeof(MyStateData))]
    struct AddStateJob : IJobProcessComponentDataWithEntity<MyData>
    {
        [ReadOnly] public EntityCommandBuffer commandBuffer;

        public void Execute(Entity entity, int index, ref MyData c0)
        {
            commandBuffer.AddComponent(entity, new MyStateData{Value = 15});
        }
    }

    struct UpdateJob : IJobProcessComponentDataWithEntity<MyData>
    {
        [ReadOnly] public EntityCommandBuffer commandBuffer;
        public bool isKeyDown;

        public void Execute(Entity entity, int index, ref MyData data)
        {
            if( isKeyDown) { data.Value -= 1; }
           if( data.Value < 0 ){ commandBuffer.DestroyEntity(entity); }
        }
    }

    [ExcludeComponent(typeof(MyData))]
    struct DestroyEventJob : IJobProcessComponentDataWithEntity<MyStateData>
    {
        [ReadOnly]  public EntityCommandBuffer commandBuffer;
        public void Execute(Entity entity, int index, ref MyStateData data)
        {
            Debug.Log($"Oh MyData destroyed!! value:{data.Value}");
            commandBuffer.RemoveComponent(entity, ComponentType.ReadWrite<MyStateData>());
        }
    }

}

[System.Serializable]
public struct MyData : IComponentData{  public int Value; }

[System.Serializable]
public struct MyStateData : ISystemStateComponentData { public int Value; }