private bool CheckTypeName(string typeName, BrokeredMessage msg)
{
if (typeName != null)
{
return(true);
}
_logger.Write(LogLevel.Error, "Received message is not a AzureCommandBus message ('PayloadTypeName' property is missing).");
var e = new BusMessageErrorEventArgs(msg,
new UnknownMessageException(
"Received message is not a AzureCommandBus message ('PayloadTypeName' property is missing)."));
BusFailed(this, e);
if (e.MessageTask == MessageHandling.PutMessageBackInQueue)
{
msg.Abandon();
}
else
{
msg.Complete();
}
return(false);
}
private void OnMessage(IAsyncResult ar)
{
BrokeredMessage brokeredMessage = null;
try
{
brokeredMessage = _queueClient.EndReceive(ar);
if (brokeredMessage == null)
{
_logger.Write(LogLevel.Debug, "Received null message (i.e. the Azure ServiceBus library completed the async op without receiving a message)");
ReceiveMessage();
return;
}
var typeName = (string) brokeredMessage.Properties[MessageProperties.PayloadTypeName];
if (!CheckTypeName(typeName, brokeredMessage))
{
ReceiveMessage();
return;
}
var type = Type.GetType(typeName, false);
if (!CheckMessageType(type, brokeredMessage, typeName))
{
ReceiveMessage();
return;
}
var method = _genericMethod.MakeGenericMethod(type);
method.Invoke(this, new object[] {brokeredMessage});
brokeredMessage.Complete();
}
catch (Exception exception)
{
_logger.Write(LogLevel.Error, "Failed to process " + brokeredMessage, exception);
var targetInvoke = exception as TargetInvocationException;
if (targetInvoke != null)
{
exception = exception.InnerException;
}
var e = new BusMessageErrorEventArgs(brokeredMessage, exception);
CommandBusFailed(this, e);
if (brokeredMessage != null)
{
if (e.MessageTask == MessageHandling.RemoveMessage)
{
brokeredMessage.Complete();
}
else
{
brokeredMessage.Abandon();
}
}
}
ReceiveMessage();
}
private void ReceiveMessage(BrokeredMessage brokeredMessage)
{
try
{
_queueClient.BeginReceive(OnMessage, null);
}
catch (Exception exception)
{
_logger.Write(LogLevel.Error, "Failed to start BeginReceive again.", exception);
var e = new BusMessageErrorEventArgs(brokeredMessage, new FatalBusException(exception));
BusFailed(this, e);
}
}
private void ReceiveMessage()
{
try
{
_queueClient.BeginReceive(OnMessage, null);
}
catch (Exception exception)
{
_logger.Write(LogLevel.Error, "Failed to invoke BeginReceive", exception);
var e = new BusMessageErrorEventArgs(null, new FatalBusException(exception));
CommandBusFailed(this, e);
}
}
private bool CheckTypeName(string typeName, BrokeredMessage msg)
{
if (typeName != null)
return true;
var e = new BusMessageErrorEventArgs(msg,
new UnknownMessageException(
"Received message is not a AzureCommandBus message ('PayloadTypeName' property is missing)."));
CommandBusFailed(this, e);
if (e.MessageTask == MessageHandling.PutMessageBackInQueue)
msg.Abandon();
else
msg.Complete();
return false;
}
private bool CheckMessageType(Type type, BrokeredMessage msg, string typeName)
{
if (type != null)
return true;
var e = new BusMessageErrorEventArgs(msg,
new UnknownMessageException(
"Failed to load the Type object for '" + typeName + "'."));
CommandBusFailed(this, e);
if (e.MessageTask == MessageHandling.PutMessageBackInQueue)
msg.Abandon();
else
msg.Complete();
return false;
}
