我正在阅读事件驱动设计。在实践中,我很难理解其中的一些内容。我正在考虑将其用于监视、解析和处理来自第 3 方 TCP 流的信息的 Windows 服务。以下是一种体面的方法,还是我错过了什么?
我的计划是让主要服务成为事件的容器:
public class MyService
{
public void RegisterAgent(ServiceAgent agent)
{
Log("Initializing agent " + agent);
agent.Initialize(this);
Log("Done intializing agent " + agent);
}
public void Log(string messageText)
{
OnSimpleLogEventLogged(this, new SimpleLogEventArgs(messageText));
}
protected void Raise<T>(EventHandler<T> eventHandler, object sender, T args) where T : EventArgs
{
var handler = eventHandler;
if (handler == null) return;
handler(sender, args);
}
public event EventHandler<SimpleLogEventArgs> SimpleLogEventLogged;
protected void OnSimpleLogEventLogged(object sender, SimpleLogEventArgs args)
{
Raise(SimpleLogEventLogged, sender, args);
}
public event EventHandler<TextRecievedEventArgs > TextRecieved;
public void OnTextRecieved(object sender, TextRecievedEventArgs args)
{
Raise(TextRecieved, sender, args);
}
public event EventHandler<TextParsedEventArgs> TextParsed;
public void OnTextParsed(object sender, TextParsedEventArgs args)
{
Raise(TextParsed, sender, args);
}
...
}
然后,使用 MEF 或类似方法,我将注册“ServiceAgent”实例,这些实例仅处理和/或引发事件,可选择在后台线程上执行此操作。例如:
public class TextParsingAgent : ServiceAgent
{
public override void Initialize(MyService service)
{
service.TextRecieved += TextRecieved;
base.Initialize(service);
}
void TextRecieved(object sender, TextRecievedEventArgs e)
{
ThreadPool.QueueUserWorkItem(TextRecievedAsync, e);
}
private void TextRecieved(object state)
{
var e = (TextRecievedEventArgs)state;
//TODO:Parse text into something meaningful and store in textParseEventArgs
service.OnTextParsed(textParseEventArgs);
}
}