public void ListenForEvents(ServiceEnvironmentEventType eventType)
{
if (_eventListener == null)
{
_eventListener = new WcfHost(this, this);
ServiceEndpoint[] rawEndpoints = _eventListener.Description.Endpoints.ToArray();
_eventListener.Description.Endpoints.Clear();
foreach (ServiceEndpoint endpoint in rawEndpoints)
{
endpoint.Address = new EndpointAddress(new Uri(endpoint.Address.Uri.ToString().Replace("{guid}", Guid.NewGuid().ToString("N"))));
_eventListener.AddServiceEndpoint(endpoint);
}
_eventListener.Open();
}
var env = this.EnvironmentConfiguration;
using (var connection = new SqlConnection(env.ConnectionString))
{
// FUTURE: in the future save all endpoints to DB
var command = new SqlCommand(env.SP_EnvironmentEventRegister, connection);
command.CommandType = CommandType.StoredProcedure;
command.Parameters.AddWithValue("@eventType", eventType.ToString());
command.Parameters.AddWithValue("@endpointName", _eventListener.Description.Endpoints.First(endpoint => endpoint.Name == typeof(ServiceEnvironment).FullName).Name);
command.Parameters.AddWithValue("@endpointAddress", _eventListener.Description.Endpoints.First(endpoint => endpoint.Name == typeof(ServiceEnvironment).FullName).Address.ToString());
connection.Open();
command.ExecuteNonQuery();
}
}
// ------------------------------
#endregion
#region Event wiring
// ------------------------------
void Ensure(ServiceEnvironmentEventType eventType)
{
if (!EventTypes.Contains(eventType))
{
throw new InvalidOperationException(String.Format("Cannot connect listener to event {0} because it is not registered to receive this event.", eventType));
}
}
void SendEnvironmentEvent(ServiceEnvironmentEventType eventType, Action <IServiceEnvironmentEventListener> listenerAction, bool throwExIfNobodyListen = true)
{
// TODO: check process/appdomain permissions
RefreshEventListenersList();
List <ServiceEnvironmentEventListenerInfo> listeners;
if (!_environmentListeners.TryGetValue(eventType, out listeners) || listeners.Count < 1)
{
if (throwExIfNobodyListen)
{
throw new ServiceEnvironmentException(String.Format("Could not find any registered listeners for {0} event.", eventType));
}
Log.Write(this.ToString(), String.Format("There are no listeners to event {0}", eventType.ToString()), LogMessageType.Warning);
return;
}
foreach (var listenerInfo in listeners)
{
try
{
using (var client = new WcfClient <IServiceEnvironmentEventListener>(this, listenerInfo.EndpointName, listenerInfo.EndpointAddress))
{
listenerAction(client.Channel);
}
}
catch (Exception ex)
{
string message = String.Format("Failed to send environment event {0} to listener at {1}, it might be dead.", eventType, listenerInfo.EndpointAddress);
if (Service.Current != null)
{
Service.Current.Log(message, ex, LogMessageType.Information);
}
else
{
throw new ServiceEnvironmentException(message, ex);
}
}
}
}
void IServiceEnvironmentEventSender.SendEnvironmentEvent(ServiceEnvironmentEventType eventType, Action <IServiceEnvironmentEventListener> listenerAction, bool throwExIfNobodyListen)
{
SendEnvironmentEvent(eventType, listenerAction, throwExIfNobodyListen);
}
