Interactor for presenting GPS track summary

TrackSummaryInteractor.swift

protocol TrackSummaryInteractorOutput {
    func update(track: TrackSummary)
}

class TrackSummaryInteractor {
    let repository: TrackRepository
    let output: TrackSummaryInteractorOutput

    init(repository: TrackRepository, output: TrackSummaryInteractorOutput) {
        self.repository = repository
        self.output = output
    }
}

extension TrackSummaryInteractor: Interactor {
    func execute() {
        //
        // Implement business logic using track repository to prepare track summary.
        //
        output.update(
            TrackSummary(trackID: 1, name: "Track", startTime: 1234567890, distance: 100)
        )
    }
}