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//===--- NIOChannelPipeline.swift -----------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2019 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
// Mini benchmark implementing the gist of SwiftNIO's ChannelPipeline as
// implemented by NIO 1 and NIO 2.[01]
let t: [BenchmarkCategory] = [.runtime, .refcount, .cpubench]
let n = 100
public let benchmarks = [
BenchmarkInfo(
name: "NIOChannelPipeline",
runFunction: runBench,
tags: t),
]
public protocol EventHandler: class {
func event(holder: Holder)
}
extension EventHandler {
public func event(holder: Holder) {
holder.fireEvent()
}
}
public final class Pipeline {
var head: Holder? = nil
public init() {}
public func addHandler(_ handler: EventHandler) {
if self.head == nil {
self.head = Holder(handler)
return
}
var node = self.head
while node?.next != nil {
node = node?.next
}
node?.next = Holder(handler)
}
public func fireEvent() {
self.head!.invokeEvent()
}
}
public final class Holder {
var next: Holder?
let node: EventHandler
init(_ node: EventHandler) {
self.next = nil
self.node = node
}
func invokeEvent() {
self.node.event(holder: self)
}
@inline(never)
public func fireEvent() {
self.next?.invokeEvent()
}
}
public final class NoOpHandler: EventHandler {
public init() {}
}
public final class ConsumingHandler: EventHandler {
var consumed = 0
public init() {}
public func event(holder: Holder) {
self.consumed += 1
}
}
@inline(never)
func runBench(iterations: Int) {
let pipeline = Pipeline()
for _ in 0..<5 {
pipeline.addHandler(NoOpHandler())
}
pipeline.addHandler(ConsumingHandler())
for _ in 0 ..< iterations {
for _ in 0 ..< 1000 {
pipeline.fireEvent()
}
}
}
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