Can I do this to get an eager singleton that runs when the c

Question

Can I do this to get an eager singleton that runs when the component is created ``` get Provides Named foo Singleton val foo Deferred lt String gt = GlobalScope async ```

gildor · Answer

Why don t you want to make it explicit Create a multi set like Set lt Deferred gt or even Set lt gt Unit gt if you don t care about lifecycle inject it to your Application and invoke every item of set onCreate so it will be like a callback hook

gildor · Answer

I mean like ``` Provides IntoSet Named OnAppCreate fun provideFoo gt Unit = ``` And inject like ``` Named OnAppCreate val onCreateActions Set lt gt Unit gt fun onCreate onCreateActions onEach it ```

gildor · Answer

You may avoid multi set if you just have only 1 case or you want to make it even more explicit and inject all those actions separately just remove IntoSet annotation and Set from injection point

dave08 · Answer

Yeah the problem is that I need to inject the `Deferred` somewhere else and `await ` it I m hoping that from the application s start till I actually need it I ll already have access to the ready result

dave08 · Answer

How can I both get it into that set with one interface for all the onCreateStartups AND have it available seperately to access it s result

gildor · Answer

Yes because deferred already caches result you can inject in multiple places just don t forget to add scope annotation

gildor · Answer

Though it looks that it would be easier to use if you would move this logic to own class and separate lambda which will preload it on app start so any code which need this result would just inject a proper class repository Instead of some abstract deferred

dave08 · Answer

True but there s no real logic there it s basically a value retreived from a shell command

gildor · Answer

Looks still like a logic of interaction with external service

dave08 · Answer

So just to make the interaction with the shell it s better to even create a single method class For now that shell is basically a top level function but maybe you re right Although Android has me used to avoiding getting to the function limit before multidex which in our case has caused problems in the past But I guess there s a line to draw up to where we should take that Thanks for the advice

gildor · Answer

gt avoiding getting to the function limit before multidex But you create new class even here this async block lambda is a new class too

gildor · Answer

gt So just to make the interaction with the shell it s better to even create a single method class It s definitely doesn t look as a work for DI for me essentially you using an external tool inside and even cache result of it Class is easier to extend it encapsulates logic it can be tested and also has more friendly API for client code you inject it by name and call a function with some meningful name instead of just Deferred lt String gt with qualifier