/// <summary>
/// Subscribe a message.
/// </summary>
/// <typeparam name="T">The type of message that the recipient subscribes for.</typeparam>
/// <param name="channel">
/// A name for a messaging channel.If a recipient subscribes
/// using a channel, and a sender sends a message using the same channel, then this
/// message will be delivered to the recipient. Other recipients who did not
/// use a channel when subscribing (or who used a different channel) will not
/// get the message.
/// </param>
/// <param name="action">The action that will be executed when a message of type T is sent.</param>
/// <returns>
/// Disposable object that can be used to unsubscribe the message from the messenger.
/// if the disposable object is disposed,the message is automatically unsubscribed.
/// </returns>
public virtual ISubscription <T> Subscribe <T>(string channel, Action <T> action)
{
SubjectBase notifier = null;
ConcurrentDictionary <Type, SubjectBase> dict = null;
if (!channelNotifiers.TryGetValue(channel, out dict))
{
dict = new ConcurrentDictionary <Type, SubjectBase>();
if (!channelNotifiers.TryAdd(channel, dict))
{
channelNotifiers.TryGetValue(channel, out dict);
}
}
if (!dict.TryGetValue(typeof(T), out notifier))
{
notifier = new Subject <T>();
if (!dict.TryAdd(typeof(T), notifier))
{
dict.TryGetValue(typeof(T), out notifier);
}
}
return((notifier as Subject <T>).Subscribe(action));
}
/// <summary>
/// Subscribe a message.
/// </summary>
/// <param name="channel">A name for a messaging channel.If a recipient subscribes
/// using a channel, and a sender sends a message using the same channel, then this
/// message will be delivered to the recipient. Other recipients who did not
/// use a channel when subscribing (or who used a different channel) will not
/// get the message. </param>
/// <param name="type">The type of message that the recipient subscribes for.</param>
/// <param name="action">The action that will be executed when a message of type T is sent.</param>
/// <returns>Disposable object that can be used to unsubscribe the message from the messenger.
/// if the disposable object is disposed,the message is automatically unsubscribed.</returns>
public virtual IDisposable Subscribe(string channel, Type type, Action <object> action)
{
Dictionary <Type, SubjectBase> dict = null;
SubjectBase notifier = null;
lock (channelNotifiers)
{
if (!channelNotifiers.TryGetValue(channel, out dict))
{
dict = new Dictionary <Type, SubjectBase>();
channelNotifiers.Add(channel, dict);
}
if (!dict.TryGetValue(type, out notifier))
{
notifier = new Subject <object>();
dict.Add(type, notifier);
}
}
return((notifier as Subject <object>).Subscribe(action));
}
