/// <summary> Unsubscribes the given <paramref name="messageConsumer"/> from the dispatcher. </summary>
/// <param name="messageConsumer">Message consumer</param>
public void Unsubscribe(IMessageConsumer messageConsumer)
{
if (messageConsumer == null)
{
return;
}
ConsumerEntry[] registeredConsumer = _registeredConsumers.Access(_ => _.ToArray());
ConsumerEntry entry = registeredConsumer.FirstOrDefault(_ => _.MessageConsumer == messageConsumer);
if (entry == null)
{
return;
}
_registeredConsumers.Access(_ => _.Remove(entry));
}
/// <summary>
/// Is invoked when the message dispatcher thread has been started.
/// </summary>
/// <param name="o">Reference to the message dispatcher</param>
private void ReadAndDispatch(object o)
{
MessageDispatcher messageDispatcher = (MessageDispatcher)o;
while (_isAlive.Get())
{
// Wait until a signal is received
messageDispatcher._processQueueEvent.Wait();
// Reset
messageDispatcher._processQueueEvent.Reset();
// Collect consumer and events
EnqueuedEvent[] queuedEvents = messageDispatcher._eventQueue.Access(list => {
var buffer = list.ToArray();
list.Clear();
return(buffer);
});
ConsumerEntry[] registeredConsumers = messageDispatcher._registeredConsumers.Access(_ => _.ToArray());
// Get the set UI thread dispatcher or set a fake one
UIThreadDispatcher uiThreadDispatcher = UIThreadDispatcher ?? (_ => _());
// Dispatch
for (int i = -1; ++i != queuedEvents.Length;)
{
EnqueuedEvent queuedEvent = queuedEvents[i];
for (int j = -1; ++j != registeredConsumers.Length;)
{
ConsumerEntry consumerEntry = registeredConsumers[j];
// Anonymous function to dispatch the event
void dispatchEvent()
{
try {
consumerEntry.MessageConsumer.OnMessageReceived(queuedEvent.Sender,
queuedEvent.EventArguments, consumerEntry.DataObject);
} catch (Exception ex) {
string errorMessage = $"Error on dispatching event to '{consumerEntry.MessageConsumer.GetType()}'. Reason: {ex}";
Error?.Invoke(errorMessage);
}
}
// Dispatch event using the configured thread
try {
if (consumerEntry.UIThreadDispatch)
{
uiThreadDispatcher(dispatchEvent);
}
else
{
dispatchEvent();
}
} catch (Exception ex) {
string errorMessage = $"Error on invoking event dispatch to '{consumerEntry.MessageConsumer.GetType()}'. Reason: {ex}";
Error?.Invoke(errorMessage);
}
}
}
}
}
