The Previously Scheduled Job Writes To The Nativearray You Must Call Jobhandle.complete()

I am getting used to ECS after changes (I haven't updated my code for a while) and I am getting exceptions in this simple situation. I have a timer system that decreases time on each timer. And I have a spawner system which spans an entity when time on the timer runs out and resets the timer.

Code (CSharp):

1. [UpdateInGroup(typeof(SimulationSystemGroup))]
2. public class CountdownTimerSystem : JobComponentSystem
3. {
4.  
5.     [BurstCompile]
6.     struct CountdownTimerSystemJob : IJobForEach<CountDownTimer>
7.     {
8.         public float deltaTime;
9.      
10.         public void Execute(ref CountDownTimer timer)
11.         {
12.             timer.Value -= deltaTime;              
13.         }
14.     }
15.  
16.     protected override JobHandle OnUpdate(JobHandle inputDependencies)
17.     {
18.         var job = new CountdownTimerSystemJob
19.         {
20.             deltaTime = Time.deltaTime
21.         };
22.      
23.         return job.Schedule(this, inputDependencies);
24.     }
25. }

Code (CSharp):

1. [UpdateInGroup(typeof(SimulationSystemGroup))]
2. [UpdateAfter(typeof(CountdownTimerSystem))]
3. public class SpawnSystem : JobComponentSystem
4. {
5.     private EndSimulationEntityCommandBufferSystem _EndFrameBarier;
6.  
7.  
8.     struct SpawnSystemJob : IJobForEachWithEntity<CountDownTimer, Spawner, Translation>
9.     {
10.  
11.         public int JobIndex;
12.         public EntityCommandBuffer.Concurrent CommandBuffer;
13.  
14.         public void Execute(Entity e, int index, ref CountDownTimer timer, [ReadOnly] ref Spawner spawner, [ReadOnly] ref Translation position)
15.         {
16.             if (timer.Value <= 0)
17.             {
18.                 timer.Value = spawner.SpawnEvery;
19.                 var entity = CommandBuffer.Instantiate(index, spawner.Prefab);
20.                 CommandBuffer.SetComponent(index, entity, new Translation() { Value = position.Value });
21.             }
22.         }
23.     }
24.  
25.     protected override void OnCreate()
26.     {
27.         base.OnCreate();
28.         _EndFrameBarier = World.GetOrCreateSystem<EndSimulationEntityCommandBufferSystem>();
29.     }
30.  
31.     protected override JobHandle OnUpdate(JobHandle inputDependencies)
32.     {
33.         var job = new SpawnSystemJob() {
34.             CommandBuffer = _EndFrameBarier.CreateCommandBuffer().ToConcurrent()
35.         };
36.         return job.Schedule(this, inputDependencies);
37.     }
38. }

I am getting this exception:

ArgumentException: The previously scheduled job SpawnSystem:SpawnSystemJob writes to the NativeArray SpawnSystemJob.Data.CommandBuffer. You must call JobHandle.Complete() on the job SpawnSystem:SpawnSystemJob, before you can write to the NativeArray safely.
EntityCommandBuffer was recorded in SpawnSystem and played back in Unity.Entities.EndSimulationEntityCommandBufferSystem.
at (wrapper managed-to-native)

What am I doing wrong?

 

You're missing AddJobHandleForProducer.

Code (CSharp):

1.  
2. protected override JobHandle OnUpdate(JobHandle inputDependencies)
3. {
4.     var job = new SpawnSystemJob() {
5.         CommandBuffer = _EndFrameBarier.CreateCommandBuffer().ToConcurrent()
6.     };
7.     inputDependencies =  job.Schedule(this, inputDependencies);
8.     _EndFrameBarier.AddJobHandleForProducer(inputDependencies);
9.     return inputDependencies;
10. }
11.  

[]'s

 

Much appreciate the answer. Moving away from [Inject] requires you to add the dependency manually.

 

O, I forgot about that thank you

 

I am new to unity, i don't know where to apply this.... It happens to me when i add trail renderer to my bullet