swift-mirror/benchmark/single-source/ObserverForwarderStruct.swift

//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2021 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//

import TestsUtils

public let benchmarks =
  BenchmarkInfo(
    name: "ObserverForwarderStruct",
    runFunction: run_ObserverForwarderStruct,
    tags: [.validation],
    legacyFactor: 5)

class Observer {
  @inline(never)
  func receive(_ value: Int) {
  }
}

protocol Sink {
  func receive(_ value: Int)
}

struct Forwarder: Sink {
  let object: Observer

  func receive(_ value: Int) {
    object.receive(value)
  }
}

class Signal {
  var observers: [Sink] = []

  func subscribe(_ sink: Sink) {
    observers.append(sink)
  }

  func send(_ value: Int) {
    for observer in observers {
      observer.receive(value)
    }
  }
}

public func run_ObserverForwarderStruct(_ iterations: Int) {
  let signal = Signal()
  let observer = Observer()
  for _ in 0 ..< 2_000 * iterations {
    signal.subscribe(Forwarder(object: observer))
  }
  signal.send(1)
}