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152 lines (132 loc) · 5.68 KB
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using System;
using System.Collections.Generic;
using System.Linq;
using Cadenza.Collections;
namespace Network
{
public abstract class MessageHandler
{
private readonly MutableLookup<MessageType, Action<MessageEventArgs>> handlers = new MutableLookup<MessageType, Action<MessageEventArgs>>();
private readonly MutableLookup<MessageType, Action<UnconnectedMessageEventArgs>> unconnectedHandlers =
new MutableLookup<MessageType, Action<UnconnectedMessageEventArgs>>();
/// <summary>
/// Registers a message handler.
/// </summary>
/// <typeparam name="T">The message type.</typeparam>
/// <param name="self">The context to register the message handler to.</param>
/// <param name="handler">The message handler to register.</param>
public void RegisterMessageHandler<T>(Action<MessageEventArgs<T>> handler)
where T : Message, new()
{
if (handler == null)
throw new ArgumentNullException("handler");
var msg = new T();
RegisterMessageHandler(msg.Protocol, msg.MessageType, e => handler(new MessageEventArgs<T>(e.Connection, (T) e.Message)));
}
/// <summary>
/// Registers an unconnected message handler.
/// </summary>
/// <typeparam name="T">The message type.</typeparam>
/// <param name="self">The context to register the message handler to.</param>
/// <param name="handler">The message handler to register.</param>
public void RegisterUnconnectedMessageHandler<T>(Action<UnconnectedMessageEventArgs<T>> handler)
where T : Message, new()
{
if (handler == null)
throw new ArgumentNullException("handler");
var msg = new T();
RegisterUnconnectedMessageHandler(msg.Protocol, msg.MessageType, e => handler(new UnconnectedMessageEventArgs<T>(e.From, (T) e.Message)));
}
protected void RegisterMessageHandler(Protocol protocol, ushort messageType, Action<MessageEventArgs> handler)
{
lock (handlers)
{
if (!handlers.Contains(new MessageType(protocol, messageType)))
{
handlers.Add(new MessageType(protocol, messageType), handler);
}
}
}
protected void RegisterUnconnectedMessageHandler(Protocol protocol, ushort messageType, Action<UnconnectedMessageEventArgs> handler)
{
lock (unconnectedHandlers)
{
if (!unconnectedHandlers.Contains(new MessageType(protocol, messageType)))
{
unconnectedHandlers.Add(new MessageType(protocol, messageType), handler);
}
}
}
protected List<Action<MessageEventArgs>> GetHandlers(Protocol protocol, ushort messageType)
{
List<Action<MessageEventArgs>> mhandlers = null;
lock (handlers)
{
IEnumerable<Action<MessageEventArgs>> thandlers;
if (handlers.TryGetValues(new MessageType(protocol, messageType), out thandlers))
mhandlers = thandlers.ToList();
}
return mhandlers;
}
protected List<Action<UnconnectedMessageEventArgs>> GetUnconnectedHandlers(Protocol protocol, ushort messageType)
{
List<Action<UnconnectedMessageEventArgs>> mhandlers = null;
lock (unconnectedHandlers)
{
IEnumerable<Action<UnconnectedMessageEventArgs>> thandlers;
if (unconnectedHandlers.TryGetValues(new MessageType(protocol, messageType), out thandlers))
mhandlers = thandlers.ToList();
}
return mhandlers;
}
private class MessageType
: IEquatable<MessageType>
{
public MessageType(Protocol protocol, ushort messageType)
{
this.protocol = protocol;
this.messageType = messageType;
}
public MessageType(Message msg)
{
protocol = msg.Protocol;
messageType = msg.MessageType;
}
private readonly Protocol protocol;
private readonly ushort messageType;
public override bool Equals(object obj)
{
if (ReferenceEquals(null, obj))
return false;
if (ReferenceEquals(this, obj))
return true;
if (obj.GetType() != typeof (MessageType))
return false;
return Equals((MessageType) obj);
}
public bool Equals(MessageType other)
{
if (ReferenceEquals(null, other))
return false;
if (ReferenceEquals(this, other))
return true;
return Equals(other.protocol, protocol) && other.messageType == messageType;
}
public override int GetHashCode()
{
unchecked
{
return (protocol.GetHashCode()*397) ^ messageType.GetHashCode();
}
}
public static bool operator ==(MessageType left, MessageType right)
{
return Equals(left, right);
}
public static bool operator !=(MessageType left, MessageType right)
{
return !Equals(left, right);
}
}
}
}