When is a capsule rebuilt?

[busslina]

• I have a capsuleA which uses capsuleB.

• I only interact with capsuleA at startup by reading it via Container.

• Will capsuleA rebuild in the future if capsuleB rebuilds, even it there are no listeners for capsuleA?

I suppose the answer is yes.

[GregoryConrad]

Will capsuleA rebuild in the future if capsuleB rebuilds, even it there are no listeners for capsuleA?

There are a few possibilities here that dictate what would happen.

First, does capsuleB emit a new value (i.e., newData != oldData)? If the data returned after a rebuild happens is the same as it was before, then capsuleA remains untouched.

Now, say capsuleB does emit new data. We must then ask whether capsuleA registers any side effects (i.e., use.something())? If it does not register any side effects, then it will be disposed/removed from the container via idempotent garbage collection. If it does register a side effect, then it will in fact be rebuilt with the new value from capsuleB (because that side effect may rely upon the new value from capsuleB in order to maintain side effect correctness.

This will all change if the capsule graph gets more complicated/capsuleA has downstream dependents. But for just two capsules, the above is correct.

[GregoryConrad]

Also, if you're curious, corresponding source code is here: https://github.com/GregoryConrad/rearch-dart/blob/3e97544773e84874d4260f03910f34089d004028/packages/rearch/lib/src/node.dart

[busslina]

Good explanation, thanks !!