Is it possible to use an Interactor for aggregating data from multiple sources?

Yes, an Interactor (in Clean Architecture or similar architectures) can be used for aggregating data from multiple sources. The Interactor is responsible for business logic and can access different repositories or services to gather the necessary data.

For example, if you need to get user information from a local database and supplement it with data from a remote API, the Interactor will call both sources, merge the results, and return an aggregated object.

Example in Kotlin:

class UserInteractor(
    private val localRepo: UserLocalRepository,
    private val remoteRepo: UserRemoteRepository
) {
    suspend fun getUserData(userId: String): UserData {
        val localData = localRepo.getUser(userId)
        val remoteData = remoteRepo.fetchUserDetails(userId)
        return mergeData(localData, remoteData)
    }

    private fun mergeData(local: UserLocal, remote: UserRemote): UserData {
        // Merge data based on business logic
        return UserData(
            id = local.id,
            name = local.name ?: remote.name,
            email = remote.email
        )
    }
}

Thus, the Interactor acts as a layer that aggregates data and implements business logic.