begginner's questions about c# job system

Hello, everybody.

I'm wondering about when the OnUpdate() function is called. In the tutorial, the speacker said that when the conditions these conditions is filled, like the follow sample:

Code (CSharp):

1. public class MovementSystem : JobComponentSystem{
2.     [ComputeJobOptimization]
3.     struct MovementJob : IJobProcessComponentData<Position, Rotation, MoveSpeed>
4.     {
5.         public float zStart;
6.         public float zEnd;
7.         public float deltaTime;
8.         public void Execute(ref Position inPosition, ref Rotation inRotation, ref MoveSpeed inSpeed)
9.         {
10.           // do something....
11.         }
12.     }
13.  
14.     protected override JobHandle OnUpdate(JobHandle inDeps)
15.     {
16.         // do something...
17.     }
18. }

But, in othercases, there is not only one job in a system. In that case, do I need to fill the all jobs conditions in a system?

 

JobComponentSystem will automatically create a ComponentGroup for each IJobProcessComponentData for you.

The system will be executed, if there is at least one ComponentGroup which can be processed (not empty).
A JobComponentSystem just schedules the jobs.
The Job it self will be executed depending on it's dependencies (JobHandle + Read/Write access of Components) or the Complete instruction.

By default OnUpdate will be called in the Update loop of the game. You can use UpdateBefore/ UpdateAfter attributes to
controll the execution order and the loop. (If you want to execute a system in FixedUpdate or LateUpdate)

 

Thank you for the answer!