//----< defines SendThread and its operations >----------------------
/*
* - asynchronous function defines Sender sendThread processing
* - creates MessageQueue<Message> to use inside Sender.sendMessage()
* - creates and starts a thread executing that processing
* - uses message.ToURL to find or create a Proxy for url destination
*/
public virtual MessageQueue <Message> defineSendProcessing()
{
MessageQueue <Message> SendingQueue = new MessageQueue <Message>();
Action sendAction = () =>
{
ThreadStart sendThreadProc = () =>
{
while (true)
{
try
{
Message SendingMessage = SendingQueue.dequeue();
if (SendingMessage.MessageContent == "closeSender")
{
Console.Write("\n send thread quitting\n\n");
break;
}
if (ProxyDB.ContainsKey(SendingMessage.ToURL))
{
ProxyDB[SendingMessage.ToURL].PROXY.sendMessage(SendingMessage);
}
else
{
ProxyAndDeadLetterQ ProxyAndDLQ1 = new ProxyAndDeadLetterQ();
// create new Proxy with Connect, save it, and use it
if (this.Connect(SendingMessage.ToURL)) // if Connect succeeds it will set Proxy and send start msg
{
ProxyAndDLQ1.PROXY = Proxy;
ProxyDB[RemoteURL] = ProxyAndDLQ1;
ProxyDB[SendingMessage.ToURL] = ProxyAndDLQ1; // save Proxy
Proxy.sendMessage(SendingMessage);
}
else
{
sendMsgNotify(String.Format("could not connect to {0}\n", SendingMessage.ToURL));
ProxyAndDLQ1.DEADLETTERQUEUE.enqueue(SendingMessage);
continue;
}
}
}
catch (Exception ex)
{
sendExceptionNotify(ex);
continue;
}
}
};
Thread t = new Thread(sendThreadProc); // start the sendThread
t.IsBackground = true;
t.Start();
};
this.setAction(sendAction);
return(SendingQueue);
}
//----< Connect repeatedly tries to send messages to service >-------
public bool Connect(string RemoteURL)
{
if (UtilityMethods.verbose)
{
sendMsgNotify("attempting to connect");
}
if (isConnected(RemoteURL))
{
return(true);
}
Proxy = CreateProxy(RemoteURL);
int attemptNumber = 0;
Message startMsg = new Message();
startMsg.FromURL = LocalURL;
startMsg.ToURL = RemoteURL;
startMsg.TimeSent = DateTime.Now;
startMsg.MessageContent = "connection start message";
while (attemptNumber < MaxConnectAttempts)
{
try
{
Proxy.sendMessage(startMsg); // will throw if server isn't listening yet
ProxyAndDeadLetterQ ProxyAndDLQ = new ProxyAndDeadLetterQ();
ProxyAndDLQ.PROXY = Proxy;
ProxyDB[RemoteURL] = ProxyAndDLQ; // remember this Proxy
if (UtilityMethods.verbose)
{
sendMsgNotify("connected");
}
return(true);
}
catch
{
++attemptNumber;
sendAttemptNotify(attemptNumber);
Thread.Sleep(100);
}
}
return(false);
}
