разработка серверов и серверных приложений лекция №4
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В данной лекции рассмотрена минимальная реализация акторной модели, включающая - отправку сообщений, - создание новых акторов и смену поведения для приема следующего сообщения. Исходный код реализации выложен на https://github.com/hwdtech/HWdTech.DS. Код на C#. При разработке использовались библиотеки: Autofac, NuUnit, Moq
Transcript of разработка серверов и серверных приложений лекция №4
Глава 5. Первая реализация 118
Концепция 119
IMessage 120
public interface IMessage
{
string Target
{
get;
}
}
MessageBus 121
public class MessageBus{
public static void Send(IMessage message){…}
public static void Join(string address, Actor actor
) { … }
}
Actor 122
public abstract class Actor{
public Actor(string address) { … }public Actor() { … }
public void Become(Action<IMessage> handler){ … }public void Receive(IMessage message) { … }
public abstract void Handle(IMessage message);}
Фасад для IoC 123
public class DIContainer{
IContainer container;
public T Resolve<T>(){
return container.Resolve<T>();}
}
Фасад для IoC 124
Файл: RouterImpl/IoCRegistration.csusing Autofac;
namespace HWdTech.DS.Internals.Implementation{
class RouterRegistrationModule : Module{
protected override void Load(ContainerBuilder builder){
IRouter router = new RouterImpl();
builder.RegisterInstance(router).As<IRouter>();}
}}
Фасад для IoC 125
public class DIContainer{
public DIContainer(){
ContainerBuilder builder = new ContainerBuilder();Assembly[] assemblies = AppDomain.CurrentDomain.GetAssemblies();builder.RegisterAssemblyModules(assemblies);this.container = builder.Build();AppDomain.CurrentDomain.AssemblyLoad += AssemblyLoadEventHandler;
}void AssemblyLoadEventHandler(object sender, AssemblyLoadEventArgs args){
LoadAssembly(args.LoadedAssembly);}LoadAssembly(Assembly assembly){
ContainerBuilder builder = new ContainerBuilder();builder.RegisterAssemblyModules(assembly);builder.Update(container);
}}
Реализация MessageBus.Join 126
static IRouter router;
public static void Join(string address, Actor actor){
if (null == router){
router = Singleton<DIContainer>.Instance.Resolve<IRouter>();}
router.RegisterOrReplace(address, actor.Receive);}
Реализация MessageBus.Send 127
static IThreadPool threadPool;
public static void Send(IMessage message){
if (null == threadPool) {threadPool = Singleton<DIContainer>.Instance.Resolve<IThreadPool>();
}threadPool.StartTask(HandleMessage, message);
}static void HandleMessage(object o){
IMessage message = (IMessage) o;if (null == router) {
router = Singleton<DIContainer>.Instance.Resolve<IRouter>();}router.Send(message);
}
Ping-Pong Test 128
[Test]public void PingPongTest(){
ThreadPoolImpl threadPool = new ThreadPoolImpl();RouterImpl router = new RouterImpl();
Mock<IMessage> pingMessage = repository.Create<IMessage>();pingMessage.SetupGet(m => m.Target).Returns("ping");
Actor pongActor = new PongActor(pingMessage.Object);
Mock<IMessage> pongMessage = repository.Create<IMessage>();pongMessage.SetupGet(m => m.Target).Returns("pong");
ManualResetEvent waitSignal = new ManualResetEvent(false);PingActor pingActor = new PingActor(pongMessage.Object, waitSignal);
Assert.True(waitSignal.WaitOne(1000));pingActor.Verify();
}
Ping-Pong Test: Ping Actor 129
class PingActor : Actor{int gotMessages;IMessage pongMessage;ManualResetEvent signal;const int numberOfResponsesShoulgGet = 5;
public PingActor(IMessage pongMessage, ManualResetEvent signal) : base("ping") {this.signal = signal;this.pongMessage = pongMessage; MessageBus.Send(pongMessage);
}public override void Handle(IMessage message) {
++gotMessages;if (numberOfResponsesShoulgGet > gotMessages) {
MessageBus.Send(pongMessage);}else { signal.Set(); }
}public void Verify() {
Assert.AreEqual(numberOfResponsesShoulgGet, gotMessages);}
}
Ping-Pong Test: Pong Actor 130
class PongActor : Actor{
IMessage pingMessage;
public PongActor(IMessage pingMessage): base("pong")
{this.pingMessage = pingMessage;
}
public override void Handle(IMessage message){
MessageBus.Send(pingMessage);}
}
Фасад для ThreadPool 131
public interface IThreadPool{
void StartTask(Action<object> task, object arg);}
public class ThreadPoolImpl : IThreadPool{
public void StartTask(Action<object> action, object args = null){
System.Threading.ThreadPool.QueueUserWorkItem(new System.Threading.WaitCallback(action), args);
}}
Пример теста для ThreadPool 132
[Test]public void ThreadPoolShouldRunTasksWithArgument(){
System.Threading.ManualResetEvent canContinue = new System.Threading.ManualResetEvent(false);
ThreadPoolImpl pool = new ThreadPoolImpl();
object o = new object();bool gotArgument = false;
pool.StartTask((obj) => {gotArgument = object.ReferenceEquals(obj, o);canContinue.Set();
}, o);
Assert.True(canContinue.WaitOne(1000));Assert.True(gotArgument);
}
Фасад для роутера 133
public interface IRouter{
void Send(IMessage message);IRouter RegisterOrReplace(string channel, Action<IMessage> handler);
}
Фасад для роутера 134
public class RouterImpl: IRouter {public RouterImpl() {
routerImpl = new ConcurrentDictionary<string, Action<IMessage>>();}public void Send(IMessage message){
Action<IMessage> handler;if (routerImpl.TryGetValue(message.Target, out handler)) {
handler(message);}else { //ToDo: адресат неизвестен - надо разрешить с помощью внешнего сервиса.
}}public IRouter RegisterOrReplace(string channel, Action<IMessage> handler){
routerImpl.AddOrUpdate(channel, handler, (key, oldValue) => { return handler; });return this;
}ConcurrentDictionary<string, Action<IMessage>> routerImpl;
}
