[confused]How to write to other enitiy component inside jobs?

I know it is convenient to write to component of same entity,But I often need to write to component of other entity,sometimes the write target entity's Archetype is the same as the source entity,sometimes not.

For example,a entity was a bomb,and it use physics to test other role entities wether in it's explosion range,and write to role enities Healthy component to hurt them.I can't find samples code to acomplish this.

Can you give some sample code to do it? thanks!

 

Should be something like this.

Code (CSharp):

1. struct (your job type) {
2.     public ComponentDataFromEntity<Health> HealthComponents;
3.  
4.     (execute signature) {
5.         for each entity damaged {
6.             HealthComponents[entity].Value = (your calculated value)
7.          }
8.     }
9.  
10.     protected override JobHandle OnUpdate(JobHandle inputDeps) {
11.         var yourJobTypeHandle = new yourJobType {
12.             HealthComponents = GetComponentDataFromEntity<Health>(isReadOnly:false);
13.         }.Schedule(...);
14.         return yourJobTypeHandle;
15.     }
16. }

 

Have you test your code before? I have try this long time ago,it throw :
InvalidOperationException: MyJob.Data.healty is not declared [ReadOnly] in a IJobParallelFor job. The container does not support parallel writing. Please use a more suitable container type.

 

When I and [NativeDisableParallelForRestriction] property,It worked! So this is the right way to do it?

 

Actually I'm not sure atm, haven't written a system in a while. It really depends on if another job will read/write that data. Using that with ComponentDataFromEntity is more difficult than writing to an array specific to a single job. Can we see what your job looks like for better recommendations? A safer way is just read that component, then use ecb to set the component.

 

It looks like I can use the ugrly and wired IJobNativeMultiHashMapMergedSharedKeyIndices to handle this thread safely,I think this may be only a temporary way,there will be easy and clear way to handle this situation in the future.