^{Originally posted by smichovan January 20, 2023}
Is there a way how to change order in witch the onClose methods of components are called?

Lets have two services where the latter is dependent of the former:

val appModule = module {
single { Database() } onClose {it?.closeConnectionPool()}
single { ServiceUsingDb(get()) } onClose {it?.useDatabaseForCleanup()}
}

Database component maintains a connection to some DB and the second component accesses the DB through the first component. The "ServiceUsingDb" needs to have DB available in onClose method. As the "ServiceUsingDb" is actually dependent on "Database" I would expect Koin to ensure the right closing order.

I made some research in the Koin code and if I understand it well, the components (instances, mappings) are stored in HashMap, means no specific order is guaranteed. In my case, it may (and does) happen that when ServiceUsingDb onClose is called, the DB is already closed and the cleanup fails.

Have I missed anything? Is there any way how to influence the onClose methods order?