AssemblyLine
AssemblyLine processes several tasks continuously in the background. Discard tasks that failed during execution during execution.
Why
Processing flow of data becomes complicated year by year. Until a few years ago I just took a picture and uploaded it. Recently, it passes through multiple flow, processing photos and processing meta information, face recognition.
Processing of data does not always succeed in all. Because mobile has an unstable factor.
- Network disconnection
- Insufficient memory
- Insufficient storage
It is necessary to have a method to make each processing independent and to process it simple.
Usage 👻
Take example of Tesla's factory.
Define Status.
enum ModelXStatus: StatusProtocol {
case spec
case assembly
case paint
}Define Error.
enum ModelXError: Error {
case invalid
}Processable protocol.
class ModelX: Processable {
typealias Status = ModelXStatus
var error: Error?
var id: String
var status: Status
var workItem: DispatchWorkItem?
var isAssembled: Bool = false
var color: UIColor?
init() {
self.id = UUID().uuidString
self.status = .spec
}
// Processing when an error occurs
func dispose(_ error: Error?) {
}
}struct ModelXPackage: Packageable {
var products: [ModelX]
}
// Define workflow steps
let assembly: Step<ModelX> = Step({ (product) -> ModelX in
product.isAssembled = true
return product
})
// Define workflow steps
let paint: Step<ModelX> = Step({ (product) -> ModelX in
product.color = .white
return product
})
// Making a manufacturing line to do workflow
let line: Line<ModelX, ModelXPackage> = Line(workflow: [assembly, paint])
// Generate 10 ModelX
(0..<10).forEach({ (index) in
let product: ModelX = ModelX()
line.generate(product)
})
// Packaging
line.packing { (products, isStopped) in
if isStopped {
print("Line is stopped")
return
}
let package = ModelXPackage(products: products)
}