swift-composable-architecture-mirror/Sources/swift-composable-architecture-benchmark/Observation.swift

import Benchmark
import ComposableArchitecture
import Foundation

let observationSuite = BenchmarkSuite(name: "Observation") { suite in
  if #available(iOS 17, macOS 14, tvOS 17, watchOS 10, *) {
    var stateWithObservation: StateWithObservation!
    suite.benchmark("ObservableState: Mutate count") {
      doNotOptimizeAway(stateWithObservation.count += 1)
    } setUp: {
      stateWithObservation = StateWithObservation()
    } tearDown: {
      stateWithObservation = nil
    }
    suite.benchmark("ObservableState: Mutate name") {
      doNotOptimizeAway(stateWithObservation.name += "!!!")
    } setUp: {
      stateWithObservation = StateWithObservation()
    } tearDown: {
      stateWithObservation = nil
    }
    suite.benchmark("ObservableState: Append item") {
      doNotOptimizeAway(stateWithObservation.items.append(Item()))
    } setUp: {
      stateWithObservation = StateWithObservation()
    } tearDown: {
      stateWithObservation = nil
    }
    suite.benchmark("ObservableState: Mutate item") {
      doNotOptimizeAway(stateWithObservation.items[0].name += "!!!")
    } setUp: {
      stateWithObservation = StateWithObservation()
    } tearDown: {
      stateWithObservation = nil
    }

    var stateWithoutObservation: StateWithoutObservation!
    suite.benchmark("State: Mutate count") {
      doNotOptimizeAway(stateWithoutObservation.count += 1)
    } setUp: {
      stateWithoutObservation = StateWithoutObservation()
    } tearDown: {
      stateWithoutObservation = nil
    }
    suite.benchmark("State: Mutate name") {
      doNotOptimizeAway(stateWithoutObservation.name += "!!!")
    } setUp: {
      stateWithoutObservation = StateWithoutObservation()
    } tearDown: {
      stateWithoutObservation = nil
    }
    suite.benchmark("State: Append item") {
      doNotOptimizeAway(stateWithoutObservation.items.append(Item()))
    } setUp: {
      stateWithoutObservation = StateWithoutObservation()
    } tearDown: {
      stateWithoutObservation = nil
    }
    suite.benchmark("State: Mutate item") {
      doNotOptimizeAway(stateWithoutObservation.items[0].name += "!!!")
    } setUp: {
      stateWithoutObservation = StateWithoutObservation()
    } tearDown: {
      stateWithoutObservation = nil
    }

    var objectWithObservation: ObjectWithObservation!
    suite.benchmark("Observable: Mutate count") {
      doNotOptimizeAway(objectWithObservation.count += 1)
    } setUp: {
      objectWithObservation = ObjectWithObservation()
    } tearDown: {
      objectWithObservation = nil
    }
    suite.benchmark("Observable: Mutate name") {
      doNotOptimizeAway(objectWithObservation.name += "!!!")
    } setUp: {
      objectWithObservation = ObjectWithObservation()
    } tearDown: {
      objectWithObservation = nil
    }
    suite.benchmark("Observable: Append item") {
      doNotOptimizeAway(objectWithObservation.items.append(Item()))
    } setUp: {
      objectWithObservation = ObjectWithObservation()
    } tearDown: {
      objectWithObservation = nil
    }
    suite.benchmark("Observable: Mutate item") {
      doNotOptimizeAway(objectWithObservation.items[0].name += "!!!")
    } setUp: {
      objectWithObservation = ObjectWithObservation()
    } tearDown: {
      objectWithObservation = nil
    }

    var objectWithoutObservation: ObjectWithoutObservation!
    suite.benchmark("Class: Mutate count") {
      doNotOptimizeAway(objectWithoutObservation.count += 1)
    } setUp: {
      objectWithoutObservation = ObjectWithoutObservation()
    } tearDown: {
      objectWithoutObservation = nil
    }
    suite.benchmark("Class: Mutate name") {
      doNotOptimizeAway(objectWithoutObservation.name += "!!!")
    } setUp: {
      objectWithoutObservation = ObjectWithoutObservation()
    } tearDown: {
      objectWithoutObservation = nil
    }
    suite.benchmark("Class: Append item") {
      doNotOptimizeAway(objectWithoutObservation.items.append(Item()))
    } setUp: {
      objectWithoutObservation = ObjectWithoutObservation()
    } tearDown: {
      objectWithoutObservation = nil
    }
    suite.benchmark("Class: Mutate item") {
      doNotOptimizeAway(objectWithoutObservation.items[0].name += "!!!")
    } setUp: {
      objectWithoutObservation = ObjectWithoutObservation()
    } tearDown: {
      objectWithoutObservation = nil
    }
  }
}

@ObservableState
private struct StateWithObservation {
  var count = 0
  var name = ""
  var items: IdentifiedArrayOf<Item> = .items
}

private struct StateWithoutObservation {
  var count = 0
  var name = ""
  var items: IdentifiedArrayOf<Item> = .items
}

@available(iOS 17, macOS 14, tvOS 17, watchOS 10, *)
@Observable
private class ObjectWithObservation {
  var count = 0
  var name = ""
  var items: IdentifiedArrayOf<Item> = .items
}

private class ObjectWithoutObservation {
  var count = 0
  var name = ""
  var items: IdentifiedArrayOf<Item> = .items
}

@ObservableState
private struct Item: Identifiable {
  let id = UUID()
  var name = ""
  var isInStock = false
}

extension IdentifiedArrayOf<Item> {
  fileprivate static var items: IdentifiedArrayOf<Item> {
    [
      Item(name: "Computer", isInStock: true),
      Item(name: "Monitor", isInStock: true),
      Item(name: "Keyboard", isInStock: true),
      Item(name: "Mouse", isInStock: true),
    ]
  }
}