private BusEventSubscriptionToken AddSubscriptionInternal <TBusEvent>(Action <TBusEvent> deliveryAction, Func <TBusEvent, bool> eventFilter, bool strongReference, IBusEventProxy proxy)
where TBusEvent : class, IBusEvent
{
if (deliveryAction == null)
{
throw new ArgumentNullException("deliveryAction");
}
if (eventFilter == null)
{
throw new ArgumentNullException("eventFilter");
}
if (proxy == null)
{
throw new ArgumentNullException("proxy");
}
lock (m_subscriptionsPadlock)
{
List <SubscriptionItem> currentSubscriptions;
if (!m_subscriptions.TryGetValue(typeof(TBusEvent), out currentSubscriptions))
{
currentSubscriptions = new List <SubscriptionItem>();
m_subscriptions[typeof(TBusEvent)] = currentSubscriptions;
}
var subscriptionToken = new BusEventSubscriptionToken(this, typeof(TBusEvent));
IBusEventSubscription subscription;
if (strongReference)
{
subscription = new StrongBusEventSubscription <TBusEvent>(subscriptionToken, deliveryAction, eventFilter);
}
else
{
subscription = new WeakBusEventSubscription <TBusEvent>(subscriptionToken, deliveryAction, eventFilter);
}
currentSubscriptions.Add(new SubscriptionItem(proxy, subscription));
return(subscriptionToken);
}
}
/// <summary>
/// Initializes a new instance of the WeakBusEventSubscription class.
/// </summary>
/// <param name="destination">Destination object</param>
/// <param name="deliveryAction">Delivery action</param>
/// <param name="eventFilter">Filter function</param>
public WeakBusEventSubscription(BusEventSubscriptionToken subscriptionToken, Action <TBusEvent> deliveryAction, Func <TBusEvent, bool> eventFilter)
{
if (subscriptionToken == null)
{
throw new ArgumentNullException("subscriptionToken");
}
if (deliveryAction == null)
{
throw new ArgumentNullException("deliveryAction");
}
if (eventFilter == null)
{
throw new ArgumentNullException("eventFilter");
}
m_subscriptionToken = subscriptionToken;
m_deliveryAction = new WeakReference(deliveryAction);
m_eventFilter = new WeakReference(eventFilter);
}
/// <summary>
/// Initializes a new instance of the StrongBusEventSubscription class.
/// </summary>
/// <param name="destination">Destination object</param>
/// <param name="deliveryAction">Delivery action</param>
/// <param name="eventFilter">Filter function</param>
public StrongBusEventSubscription(BusEventSubscriptionToken subscriptionToken, Action <TBusEvent> deliveryAction, Func <TBusEvent, bool> eventFilter)
{
if (subscriptionToken == null)
{
throw new ArgumentNullException("subscriptionToken");
}
if (deliveryAction == null)
{
throw new ArgumentNullException("deliveryAction");
}
if (eventFilter == null)
{
throw new ArgumentNullException("eventFilter");
}
m_subscriptionToken = subscriptionToken;
m_deliveryAction = deliveryAction;
m_eventFilter = eventFilter;
}
private void RemoveSubscriptionInternal <TBusEvent>(BusEventSubscriptionToken subscriptionToken)
where TBusEvent : class, IBusEvent
{
if (subscriptionToken == null)
{
throw new ArgumentNullException("subscriptionToken");
}
lock (m_subscriptionsPadlock)
{
List <SubscriptionItem> currentSubscriptions;
if (!m_subscriptions.TryGetValue(typeof(TBusEvent), out currentSubscriptions))
{
return;
}
var currentlySubscribed = (from sub in currentSubscriptions
where object.ReferenceEquals(sub.Subscription.SubscriptionToken, subscriptionToken)
select sub).ToList();
currentlySubscribed.ForEach(sub => currentSubscriptions.Remove(sub));
}
}
/// <summary>
/// Unsubscribe from a particular bus event type.
///
/// Does not throw an exception if the subscription is not found.
/// </summary>
/// <typeparam name="TBusEvent">Type of bus event</typeparam>
/// <param name="subscriptionToken">Subscription token received from Subscribe</param>
public void Unsubscribe <TBusEvent>(BusEventSubscriptionToken subscriptionToken) where TBusEvent : class, IBusEvent
{
RemoveSubscriptionInternal <TBusEvent>(subscriptionToken);
}