How to make network calls? about flutter_flux HOT 1 OPEN

Actually thinking about it more made me realize it is definitely not the best idea to call this action from Widget's build function for various reasons

1. Flutter calls Widget's build multiple times during its lifetime and it is not ideal to do something as heavy as a network call every time build is called.
2. A way to overcome point 1 above is to guard it in some condition, but really what could be a better condition in this case? Either maintain flags that tell you if this call was previously made, if yes, do not make another call or check in the state and if data is null or empty, make a call.
3. Using flags could get really messy really fast and then you have to be extremely careful flipping those at various places.
4. Checking in state for null or empty data isn't ideal either cause null or empty data could be legitimate states. It does not always mean that network call was never made.

I think the best approach would be that the store (MessageStore in this example) also listens to user auth state changes and as soon as the user is logged in, this store also receives an action callback and kickstarts the network fetch instead of waiting until widget does it.

This approach works well in this case but also leaves a question, what if this MessageStore were to depend on some data from UserStore? Meaning that both UserStore and MessageStore listen to same action callback but for MessageStore to react to that action callback, it needs something from UserStore. In this case how do you make sure that UserStore always finishes its execution before MessageStore starts its execution? I believe React's Flux has API waitFor()

from flutter_flux.