benchmark/single-source/ObserverClosure.swift

//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 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 ObserverClosure = BenchmarkInfo(
  name: "ObserverClosure",
  runFunction: run_ObserverClosure,
  tags: [.validation])

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

class Signal {
  var observers: [(Int) -> ()] = []

  func subscribe(_ observer: @escaping (Int) -> ()) {
    observers.append(observer)
  }

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

public func run_ObserverClosure(_ iterations: Int) {
  let signal = Signal()
  let observer = Observer()
  for _ in 0 ..< 10_000 * iterations {
    signal.subscribe { i in observer.receive(i) }
  }
  signal.send(1)
}