/// <summary>
/// Request a subscription for the specified instance
/// </summary>
/// <param name="instance">The instance asking for its subscription</param>
/// <returns>True, if the subscription has been succeeded</returns>
public bool Subscribe(IPortHeartbeat instance)
{
for (int i = 0; i < MaxSubscribers; i++)
{
if (this._subscriptions[i] == null)
{
//a free cell was found: fill it
this._subscriptions[i] = instance;
this.RecalcCount();
return(true);
}
}
//no more free rooms
return(false);
}
/// <summary>
/// Remove the subscription for the specified instance
/// </summary>
/// <param name="instance">The instance being unsubscribed</param>
/// <returns>True, if the removal has been succeeded</returns>
public bool Unsubscribe(IPortHeartbeat instance)
{
for (int i = 0; i < MaxSubscribers; i++)
{
if (this._subscriptions[i] == instance)
{
//subscription found: remove it
this._subscriptions[i] = null;
this.RecalcCount();
return(true);
}
}
//no match was found
return(false);
}
/// <summary>
/// The timer handler
/// </summary>
/// <param name="state">(not used)</param>
private void TimerTick(object state)
{
//prevent spurious callbacks, once the timer has been disposed
if (this._clock == null)
{
return;
}
lock (this._semaphore)
{
//scan for all the subscriptions
for (int i = 0; i < this._optimizedCount; i++)
{
//check for a subscribed instance, enabled for notification
IPortHeartbeat subscription = this._subscriptions[i];
if (subscription != null &&
subscription.IsEnabled)
{
subscription.Tick();
}
}
}
}