/// <summary>
/// Removes the event if empty.
/// </summary>
/// <param name="eventSubject">The event subject.</param>
private void RemoveEventSubjectIfEmpty(EventSubject eventSubject)
{
if (!eventSubject.HasPublications && !eventSubject.HasSubscriptions)
{
this.subjects.Remove(eventSubject.Subject);
}
}
/// <summary>
/// Registers the publisher.
/// </summary>
/// <param name="subject">The subject.</param>
/// <param name="publisher">The publisher.</param>
/// <param name="eventName">Name of the event.</param>
public void RegisterPublisher(string subject, object publisher, string eventName)
{
lock (this.subjects)
{
EventSubject publishedEvent = this.GetEvent(subject);
publishedEvent.AddPublication(new Publication(publishedEvent, publisher, eventName));
}
}
/// <summary>
/// Gets the event.
/// </summary>
/// <param name="eventName">Name of the event.</param>
/// <returns><see cref="EventSubject"/> for the specified event name.</returns>
private EventSubject GetEvent(string eventName)
{
lock (this.subjects)
{
if (!this.subjects.ContainsKey(eventName))
{
var subject = new EventSubject(eventName);
this.subjects.Add(eventName, subject);
return(subject);
}
return(this.subjects[eventName]);
}
}
/// <summary>
/// Registers the subscriber.
/// </summary>
/// <param name="subject">The subject.</param>
/// <param name="subscriber">The subscriber.</param>
/// <param name="handlerMethodName">Name of the handler method.</param>
/// <param name="threadOption">The thread option.</param>
public void RegisterSubscriber(string subject, object subscriber, string handlerMethodName, ThreadOption threadOption)
{
Requires.NotNull(subject, "subject");
Requires.NotNull(subscriber, "subscriber");
Requires.NotNullOrEmpty(handlerMethodName, "handlerMethodName");
this.VerifyThreadOption(threadOption);
lock (this.subjects)
{
EventSubject publishedEvent = this.GetEvent(subject);
publishedEvent.AddSubscription(new WeakSubscription(publishedEvent, subscriber, handlerMethodName, this.dispatcher, threadOption));
}
}
/// <summary>
/// Unsubscribes for.
/// </summary>
/// <param name="subject">The subject.</param>
/// <param name="predicate">The predicate.</param>
private void RemoveSubscriptionFor(string subject, Func <SubscriptionBase, bool> predicate)
{
lock (this.subjects)
{
EventSubject publishedEvent = this.GetEvent(subject);
SubscriptionBase subscriptionToRemove = publishedEvent.Subscriptions.LastOrDefault(predicate);
if (subscriptionToRemove != null)
{
publishedEvent.RemoveSubscription(subscriptionToRemove);
this.RemoveEventSubjectIfEmpty(publishedEvent);
}
}
}
/// <summary>
/// Registers the subscriber for.
/// </summary>
/// <param name="subject">The subject.</param>
/// <param name="handlerAction">The handler action.</param>
/// <param name="threadOption">The thread option.</param>
private void AddSubscribtionFor(string subject, Delegate handlerAction, ThreadOption threadOption)
{
lock (this.subjects)
{
EventSubject publishedEvent = this.GetEvent(subject);
SubscriptionBase subscription;
if (handlerAction.Method.IsStatic)
{
subscription = new StaticSubscription(handlerAction, this.dispatcher, threadOption);
}
else
{
subscription = new WeakSubscription(publishedEvent, handlerAction, this.dispatcher, threadOption);
}
publishedEvent.AddSubscription(subscription);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="WeakSubscription"/> class.
/// </summary>
/// <param name="subject">The subject.</param>
/// <param name="subscriber">The subscriber.</param>
/// <param name="handlerMethodInfo">The handler method info.</param>
/// <param name="dispatcher">The UI thread dispatcher.</param>
/// <param name="threadOption">The thread option.</param>
protected WeakSubscription(EventSubject subject, object subscriber, MethodInfo handlerMethodInfo, Dispatcher dispatcher, ThreadOption threadOption)
: base(handlerMethodInfo, dispatcher, threadOption)
{
Requires.NotNull(subject, "subject");
Requires.NotNull(subscriber, "subscriber");
Requires.NotNull(handlerMethodInfo, "handlerMethodInfo");
if (handlerMethodInfo.IsStatic)
{
throw ExceptionBuilder.ArgumentNotValid("handlerMethodInfo", Messages.PassedMethodCantBeStatic);
}
this._handlerMethodName = handlerMethodInfo.Name;
this.subject = subject;
this.subscriberReference = new WeakReference(subscriber);
this.typeHandle = subscriber.GetType().TypeHandle;
this.methodHandle = handlerMethodInfo.MethodHandle;
}
/// <summary>
/// Unregisters the publisher.
/// </summary>
/// <param name="subject">The subject.</param>
/// <param name="publisher">The publisher.</param>
/// <param name="eventName">Name of the event.</param>
public void UnregisterPublisher(string subject, object publisher, string eventName)
{
lock (this.subjects)
{
EventSubject publishedEvent = this.GetEvent(subject);
List <Publication> publicationsToRemove =
new List <Publication>(
publishedEvent.Publications.Where(p => (p.EventName == eventName && p.Publisher == publisher)));
foreach (Publication publication in publicationsToRemove)
{
publishedEvent.RemovePublication(publication);
}
this.RemoveEventSubjectIfEmpty(publishedEvent);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="Publication"/> class.
/// </summary>
/// <param name="subject">The subject.</param>
/// <param name="publisher">The publisher.</param>
/// <param name="eventName">Name of the event.</param>
internal Publication(EventSubject subject, object publisher, string eventName)
{
Requires.NotNull(subject, "subject");
this.subject = subject;
this.publisherReference = new WeakReference(publisher);
this.EventName = eventName;
Type publisherType = publisher.GetType();
EventInfo publishedEvent = publisherType.GetEvent(eventName, BindingFlags.Public | BindingFlags.Static | BindingFlags.Instance);
if (publishedEvent == null)
{
throw new ArgumentException(string.Format(Messages.PublicEventNotFound, eventName, publisherType.Name));
}
EnsureIfIsSupported(publishedEvent);
Delegate handler = Delegate.CreateDelegate(publishedEvent.EventHandlerType, this, this.GetType().GetMethod(EventHandlerMethodName));
publishedEvent.AddEventHandler(publisher, handler);
}
/// <summary>
/// Initializes a new instance of the <see cref="WeakSubscription"/> class.
/// </summary>
/// <param name="subject">The subject.</param>
/// <param name="subscriber">The subscriber.</param>
/// <param name="handlerMethodName">Name of the handler method.</param>
/// <param name="dispatcher">The UI thread dispatcher.</param>
/// <param name="threadOption">The thread option.</param>
internal WeakSubscription(EventSubject subject, object subscriber, string handlerMethodName, Dispatcher dispatcher, ThreadOption threadOption)
: this(subject, subscriber, GetMethodInfo(subscriber, handlerMethodName, null), dispatcher, threadOption)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="WeakSubscription"/> class.
/// </summary>
/// <param name="subject">The subject.</param>
/// <param name="handlerAction">The handler action.</param>
/// <param name="dispatcher">The UI thread dispatcher.</param>
/// <param name="threadOption">The thread option.</param>
internal WeakSubscription(EventSubject subject, Delegate handlerAction, Dispatcher dispatcher, ThreadOption threadOption)
: this(subject, CheckHandlerAction(handlerAction).Target, CheckHandlerAction(handlerAction).Method, dispatcher, threadOption)
{
}
