/// <summary>
/// Adds a subscriber to the server's notification list.
/// </summary>
/// <param name="target">The target object for which the subscriber is requesting notifications.</param>
/// <param name="subscriber">The subscriber that wishes to receive notifications for the specified target.</param>
public void Subscribe(DependencyObject target, IDependencyPropertyChangeNotificationSubscriber subscriber)
{
lock (subscriptions)
{
PooledLinkedList <IDependencyPropertyChangeNotificationSubscriber> subscribers;
if (!subscriptions.TryGetValue(target, out subscribers))
{
lock (subscriberListPool)
{
subscribers = subscriberListPool.Retrieve();
}
subscriptions[target] = subscribers;
}
subscribers.AddLast(subscriber);
}
}
/// <summary>
/// Adds a subscriber to the server's notification list.
/// </summary>
/// <param name="target">The target object for which the subscriber is requesting notifications.</param>
/// <param name="subscriber">The subscriber that wishes to receive notifications for the specified target.</param>
public void Subscribe(DependencyObject target, IDependencyPropertyChangeNotificationSubscriber subscriber)
{
lock (subscriptions)
{
PooledLinkedList<IDependencyPropertyChangeNotificationSubscriber> subscribers;
if (!subscriptions.TryGetValue(target, out subscribers))
{
lock (subscriberListPool)
{
subscribers = subscriberListPool.Retrieve();
}
subscriptions[target] = subscribers;
}
subscribers.AddLast(subscriber);
}
}
/// <summary>
/// Removes a subscriber from the server's notification list.
/// </summary>
/// <param name="target">The target object for which the subscriber was requesting notifications.</param>
/// <param name="subscriber">The subscriber that wishes to stop receiving notifications for the specified target.</param>
public void Unsubscribe(DependencyObject target, IDependencyPropertyChangeNotificationSubscriber subscriber)
{
lock (subscriptions)
{
PooledLinkedList<IDependencyPropertyChangeNotificationSubscriber> subscribers;
if (!subscriptions.TryGetValue(target, out subscribers))
return;
subscribers.Remove(subscriber);
if (subscribers.Count == 0)
{
subscriptions.Remove(target);
lock (subscriberListPool)
{
subscriberListPool.Release(subscribers);
}
}
}
}
/// <summary>
/// Removes a subscriber from the server's notification list.
/// </summary>
/// <param name="target">The target object for which the subscriber was requesting notifications.</param>
/// <param name="subscriber">The subscriber that wishes to stop receiving notifications for the specified target.</param>
public void Unsubscribe(DependencyObject target, IDependencyPropertyChangeNotificationSubscriber subscriber)
{
lock (subscriptions)
{
PooledLinkedList <IDependencyPropertyChangeNotificationSubscriber> subscribers;
if (!subscriptions.TryGetValue(target, out subscribers))
{
return;
}
subscribers.Remove(subscriber);
if (subscribers.Count == 0)
{
subscriptions.Remove(target);
lock (subscriberListPool)
{
subscriberListPool.Release(subscribers);
}
}
}
}
/// <summary>
/// Unregisters the specified subscriber from receiving change notifications for the specified dependency property.
/// </summary>
/// <param name="dobj">The dependency object to monitor for changes.</param>
/// <param name="dprop">The dependency property for which to stop receiving change notifications.</param>
/// <param name="subscriber">The subscriber that wishes to stop receiving change notifications for the specified dependency property.</param>
internal static void UnregisterChangeNotification(DependencyObject dobj, DependencyProperty dprop, IDependencyPropertyChangeNotificationSubscriber subscriber)
{
Contract.Require(dobj, "dobj");
Contract.Require(dprop, "dprop");
Contract.Require(subscriber, "subscriber");
dprop.changeNotificationServer.Unsubscribe(dobj, subscriber);
}
/// <summary>
/// Unregisters the specified subscriber from receiving change notifications for the specified dependency property.
/// </summary>
/// <param name="dobj">The dependency object to monitor for changes.</param>
/// <param name="dprop">The dependency property for which to stop receiving change notifications.</param>
/// <param name="subscriber">The subscriber that wishes to stop receiving change notifications for the specified dependency property.</param>
internal static void UnregisterChangeNotification(DependencyObject dobj, DependencyProperty dprop, IDependencyPropertyChangeNotificationSubscriber subscriber)
{
Contract.Require(dobj, nameof(dobj));
Contract.Require(dprop, nameof(dprop));
Contract.Require(subscriber, nameof(subscriber));
dprop.changeNotificationServer.Unsubscribe(dobj, subscriber);
}
/// <summary>
/// Registers the specified subscriber to receive change notifications for the specified dependency property.
/// </summary>
/// <param name="dobj">The dependency object to monitor for changes.</param>
/// <param name="dprop">The dependency property for which to receive change notifications.</param>
/// <param name="subscriber">The subscriber that wishes to receive change notifications for the specified dependency property.</param>
internal static void RegisterChangeNotification(DependencyObject dobj, DependencyProperty dprop, IDependencyPropertyChangeNotificationSubscriber subscriber)
{
Contract.Require(dobj, nameof(dobj));
Contract.Require(dprop, nameof(dprop));
Contract.Require(subscriber, nameof(subscriber));
dprop.changeNotificationServer.Subscribe(dobj, subscriber);
}