因为经常买双色球,嫌每次对彩票号麻烦,于是休息的时候做了个双色球兑奖的小程序,做完了发现业务还挺复杂的,于是改DDD重做设计,拆分服务,各种折腾...,不过这和本随笔没多大关系,等差不多了再总结一下,有空就写出来。
上面说了拆服务，拆成了录入，开奖，兑奖三个服务，三个服务开始是用消息队列的，不过后来发现其实就是服务的领域对象之间的交互，就联想到了Actor，面向对象于是一切都是对象，actor也是一切都是actor，看着就门当户对，于是就干掉消息队列。。。细节以后有机会再说。
上面其实也和这随笔没啥关系，有关系的是，因为时间关系，没去了解akka的文档，于是好奇一件事，服务器连接地址中的"user"是哪来的：
//var section = (AkkaConfigurationSection)ConfigurationManager.GetSection("akka");
//using (var system = ActorSystem.Create("TestClient", section.AkkaConfig))
using (var system = ActorSystem.Create("TestClient")) { var actor = system.ActorSelection("akka.tcp://TestServer@localhost:8081/user/tester"); while (true) { var input = Console.ReadLine(); if (input.Equals("1")) { actor.Tell(new DTO("11111")); } else if (input.Equals("2")) { actor.Tell(new DTO("22222")); } else { actor.Tell(new DTO("H W")); } } } 上面是客户端，下面是服务端：
1 var config = ConfigurationFactory.ParseString(@" 2 akka { 3 actor { 4 provider = ""Akka.Remote.RemoteActorRefProvider, Akka.Remote"" 5 } 6 remote { 7 helios.tcp { 8 transport-class = ""Akka.Remote.Transport.Helios.HeliosTcpTransport, Akka.Remote"" 9 applied-adapters = []10 transport-protocol = tcp11 port = 808112 hostname = localhost13 }14 }15 }16 ");17 18 using (var system = ActorSystem.Create("TestServer", config))19 {20 system.ActorOf ("tester");21 22 Console.ReadLine();23 } 文档想必很多，最近有别的要看，于是想想看看代码得了，反正一时还不会用到生产环境，到时候再说吧，先解决好奇的问题。
于是首先是ActorSystem的实现类ActorSystemImpl，system.ActorOf<TestDTOActor>("tester")对服务端路径影响的应该是ActorOf：
public override IActorRef SystemActorOf(string name = null) { return _provider.SystemGuardian.Cell.ActorOf (name); }
于是找找_provider:
public ActorSystemImpl(string name, Config config) { if(!Regex.Match(name, "^[a-zA-Z0-9][a-zA-Z0-9-]*$").Success) throw new ArgumentException( "invalid ActorSystem name [" + name + "], must contain only word characters (i.e. [a-zA-Z0-9] plus non-leading '-')"); if(config == null) throw new ArgumentNullException("config"); _name = name; ConfigureSettings(config); ConfigureEventStream(); ConfigureProvider(); ConfigureTerminationCallbacks(); ConfigureScheduler(); ConfigureSerialization(); ConfigureMailboxes(); ConfigureDispatchers(); ConfigureActorProducerPipeline(); } private void ConfigureSettings(Config config) { _settings = new Settings(this, config); } private void ConfigureProvider() { Type providerType = Type.GetType(_settings.ProviderClass); global::System.Diagnostics.Debug.Assert(providerType != null, "providerType != null"); var provider = (IActorRefProvider)Activator.CreateInstance(providerType, _name, _settings, _eventStream); _provider = provider; } public Settings(ActorSystem system, Config config) { _userConfig = config; _fallbackConfig = ConfigurationFactory.Default(); RebuildConfig(); System = system; ConfigVersion = Config.GetString("akka.version"); ProviderClass = Config.GetString("akka.actor.provider"); var providerType = Type.GetType(ProviderClass); if (providerType == null) throw new ConfigurationException(string.Format("'akka.actor.provider' is not a valid type name : '{0}'", ProviderClass)); if (!typeof(IActorRefProvider).IsAssignableFrom(providerType)) throw new ConfigurationException(string.Format("'akka.actor.provider' is not a valid actor ref provider: '{0}'", ProviderClass)); SupervisorStrategyClass = Config.GetString("akka.actor.guardian-supervisor-strategy"); AskTimeout = Config.GetTimeSpan("akka.actor.ask-timeout", allowInfinite: true); CreationTimeout = Config.GetTimeSpan("akka.actor.creation-timeout"); UnstartedPushTimeout = Config.GetTimeSpan("akka.actor.unstarted-push-timeout"); SerializeAllMessages = Config.GetBoolean("akka.actor.serialize-messages"); SerializeAllCreators = Config.GetBoolean("akka.actor.serialize-creators"); LogLevel = Config.GetString("akka.loglevel"); StdoutLogLevel = Config.GetString("akka.stdout-loglevel"); Loggers = Config.GetStringList("akka.loggers"); LoggerStartTimeout = Config.GetTimeSpan("akka.logger-startup-timeout"); //handled LogConfigOnStart = Config.GetBoolean("akka.log-config-on-start"); LogDeadLetters = 0; switch (Config.GetString("akka.log-dead-letters")) { case "on": case "true": LogDeadLetters = int.MaxValue; break; case "off": case "false": LogDeadLetters = 0; break; default: LogDeadLetters = Config.GetInt("akka.log-dead-letters"); break; } LogDeadLettersDuringShutdown = Config.GetBoolean("akka.log-dead-letters-during-shutdown"); AddLoggingReceive = Config.GetBoolean("akka.actor.debug.receive"); DebugAutoReceive = Config.GetBoolean("akka.actor.debug.autoreceive"); DebugLifecycle = Config.GetBoolean("akka.actor.debug.lifecycle"); FsmDebugEvent = Config.GetBoolean("akka.actor.debug.fsm"); DebugEventStream = Config.GetBoolean("akka.actor.debug.event-stream"); DebugUnhandledMessage = Config.GetBoolean("akka.actor.debug.unhandled"); DebugRouterMisconfiguration = Config.GetBoolean("akka.actor.debug.router-misconfiguration"); Home = Config.GetString("akka.home") ?? ""; DefaultVirtualNodesFactor = Config.GetInt("akka.actor.deployment.default.virtual-nodes-factor"); SchedulerClass = Config.GetString("akka.scheduler.implementation"); //TODO: dunno.. we dont have FiniteStateMachines, dont know what the rest is /* final val SchedulerClass: String = getString("akka.scheduler.implementation") final val Daemonicity: Boolean = getBoolean("akka.daemonic") final val DefaultVirtualNodesFactor: Int = getInt("akka.actor.deployment.default.virtual-nodes-factor") */ } 很明显，看配置文件的akka.actor.provider:
于是RemoteActorRefProvider：
public LocalActorRef SystemGuardian { get { return _local.SystemGuardian; } } public RemoteActorRefProvider(string systemName, Settings settings, EventStream eventStream) { settings.InjectTopLevelFallback(RemoteConfigFactory.Default()); var remoteDeployer = new RemoteDeployer(settings); Func deadLettersFactory = path => new RemoteDeadLetterActorRef(this, path, eventStream); _local = new LocalActorRefProvider(systemName, settings, eventStream, remoteDeployer, deadLettersFactory); RemoteSettings = new RemoteSettings(settings.Config); Deployer = remoteDeployer; _log = _local.Log; } 好吧，看LocalActorRefProvider:
public void Init(ActorSystemImpl system) { _system = system; //The following are the lazy val statements in Akka var defaultDispatcher = system.Dispatchers.DefaultGlobalDispatcher; _defaultMailbox = () => new ConcurrentQueueMailbox(); //TODO:system.Mailboxes.FromConfig(Mailboxes.DefaultMailboxId) _rootGuardian = CreateRootGuardian(system); _tempContainer = new VirtualPathContainer(system.Provider, _tempNode, _rootGuardian, _log); _rootGuardian.SetTempContainer(_tempContainer); _userGuardian = CreateUserGuardian(_rootGuardian, "user"); _systemGuardian = CreateSystemGuardian(_rootGuardian, "system", _userGuardian); //End of lazy val _rootGuardian.Start(); // chain death watchers so that killing guardian stops the application _systemGuardian.Tell(new Watch(_userGuardian, _systemGuardian)); //Should be SendSystemMessage _rootGuardian.Tell(new Watch(_systemGuardian, _rootGuardian)); //Should be SendSystemMessage _eventStream.StartDefaultLoggers(_system); } private LocalActorRef CreateUserGuardian(LocalActorRef rootGuardian, string name) //Corresponds to Akka's: override lazy val guardian: LocalActorRef { return CreateRootGuardianChild(rootGuardian, name, () => { var props = Props.Create (UserGuardianSupervisorStrategy); var userGuardian = new LocalActorRef(_system, props, DefaultDispatcher, _defaultMailbox, rootGuardian, RootPath/name); return userGuardian; }); } 看样子，这个RootPath还重载了操作符：
public static ActorPath operator /(ActorPath path, string name) { return new ChildActorPath(path, name, 0); } public static ActorPath operator /(ActorPath path, IEnumerable name) { var a = path; foreach (string element in name) { a = a / element; } return a; } 现在_userGuardian路径是看到了，生拼上去的，那么哪里用的呢
LocalActorRefProvider: public LocalActorRef Guardian { get { return _userGuardian; } }RemoteActorRefProvider: public LocalActorRef Guardian { get { return _local.Guardian; } } 再回来看system.ActorOf<TestDTOActor>("tester")这句:
public override IActorRef ActorOf(Props props, string name = null) { return _provider.Guardian.Cell.ActorOf(props, name: name); } 这就是我自己配的provider造成的，其实还是配置问题，当然，这么看我们其实可以实现自己的provider，想怎么搞就怎么搞，有时间其实还是应该看下文档，不过想来文档应该会说怎么用什么样，当应该不会说怎么实现的，要知道为什么，怎么改，估计还是要自己看代码，此致。