// It process a message stream which contains a number of queries
// It splits the message stream into individual query messages which are sent one by one to server to be processed.
public void ProcessStream(ref Message ReceivedMessage, ref WriteClient Writeclient, ref Sender WCSender)
{
XDocument XMLDoc = XDocument.Parse(ReceivedMessage.MessageContent);
Console.WriteLine("\n Latest message stream to WriteClient has been currently saved in the directory\n");
" XML Message stream being sent to the server for processing".Wrap();
var Queries = XMLDoc.Element("MessageStream").Elements();
try
{
foreach (var Query in Queries)
{
int NumberofQ = int.Parse(Query.LastAttribute.Value); // Last attribute contains information about number of queries of this particular type in stream
Query.LastAttribute.Remove(); // It is removed as every message is sent to server as a standalone entity
for (int i = 1; i <= NumberofQ; ++i)
{
Message MSG = new Message();
MSG.FromURL = ReceivedMessage.ToURL;
MSG.ToURL = Writeclient.RemoteURL;
MSG.MessageContent = Query.ToString();
MSG.TimeSent = DateTime.Now;
if (Writeclient.LogMessages == true) // Requirement 6 is met here as sent messages are logged to console only if command prompt argument says so
{
String.Format(" Sending a message to {0}", MSG.ToURL).Wrap();
Console.Write("\n Sender is {0}", MSG.FromURL);
Console.Write("\n MessageContent is\n {0}", MSG.MessageContent);
}
WCSender.sendMessage(MSG); // message is sent across using sender of write client
Thread.Sleep(100);
}
}
}
catch (Exception e)
{
Console.WriteLine("\n " + e.Message + "\n");
}
}
static void Main(string[] args)
{
"\n Starting Write Client or writer for database".Wrap();
Console.Title = "WriteClient";
WriteClient Writeclient = new WriteClient();
Writeclient.processCommandLine(args);
String.Format(" Url of Write Client is {0}", Writeclient.LocalURL).Wrap();
string localPort = UtilityMethods.urlPort(Writeclient.LocalURL);
string localAddr = UtilityMethods.urlAddress(Writeclient.LocalURL);
Receiver WCReceiver = new Receiver(localPort, localAddr);
Sender WCSender = new Sender(Writeclient.LocalURL);
int NumberofQ = 0;
XDocument XMLDoc = new XDocument();
Message MessageStream = new Message();
// New service action is defined for receiver which handles the way receiver behaves on received message in WriteClient
Action WCserviceAction = () =>
{
try
{
Message ReceivedMessage = new Message();
while (true)
{
ReceivedMessage = WCReceiver.getMessage(); // note use of non-service method to deQ messages
if (ReceivedMessage.ToURL != ReceivedMessage.FromURL)
{
ReceivedMessage.TimeReceived = DateTime.Now;
ReceivedMessage.TravelTime = DateTime.Now - ReceivedMessage.TimeSent;
"\n Received a new message".Wrap();
Console.Write("\n Sender is {0}", ReceivedMessage.FromURL);
Console.Write("\n MessageContent is\n {0}", ReceivedMessage.MessageContent);
Console.Write("\n Message was sent on {0}", ReceivedMessage.TimeSent);
Console.Write("\n Message was received on {0}", DateTime.Now); //Demonstarting another way to convert milliseconds to microseconds. Although, all server measurments of time are done using high resolution timer.
Console.Write("\n Message took {0} milliseconds or {1} microseconds on communication channel (round-trip, including its processing)\n", (DateTime.Now - ReceivedMessage.TimeSent).TotalMilliseconds, (DateTime.Now.Ticks / 10 - ReceivedMessage.TimeSent.Ticks / 10));
if (ReceivedMessage.FromURL == Writeclient.RemoteURL)
{
Console.Write("\n Server took {0} microseconds to process this query)\n", ReceivedMessage.ServerProcessTime);
}
}
if (ReceivedMessage.MessageContent.StartsWith("<MessageStream>"))
{
Writeclient.ProcessStream(ref ReceivedMessage, ref Writeclient, ref WCSender);
"XML Message stream have been sent to the server for processing".Wrap();
MessageStream = ReceivedMessage;
XMLDoc = XDocument.Parse(ReceivedMessage.MessageContent);
foreach (var element in XMLDoc.Element("MessageStream").Elements()) // To know the total number of queries in original message
{
NumberofQ += int.Parse(element.LastAttribute.Value);
}
XMLDoc.Element("MessageStream").Elements().Remove(); // As client would be receiving two types of messages.
} // One is MessageStream XML message and other is Reply messages from server
if (ReceivedMessage.MessageContent.StartsWith("<QueryType"))
{
XElement QueryResult = XElement.Parse(ReceivedMessage.MessageContent);
XMLDoc.Root.Add(QueryResult);
--NumberofQ; // Reference for received message stream is saved in order to send the same message back to its source
if (NumberofQ == 0) // NumberofQ counted the number of queries. When all are processed,
{ // server is notified about that.
Message Final = new Message();
Final.ToURL = Writeclient.RemoteURL;
Final.FromURL = Writeclient.LocalURL;
Final.MessageContent = "DONE !! All queries from this client have been processed.";
Final.TimeSent = DateTime.Now;
WCSender.sendMessage(Final);
MessageStream.MessageContent = XMLDoc.ToString();
XMLDoc.Save("Results.xml");
if (MessageStream.ToURL != MessageStream.FromURL)
{
UtilityMethods.swapUrls(ref MessageStream);
WCSender.sendMessage(MessageStream);
}
}
}
if (ReceivedMessage.MessageContent == "closeReceiver")
{
break;
}
}
}
catch (Exception e)
{
Console.WriteLine(" " + e.Message);
}
};
if (WCReceiver.StartService())
{
WCReceiver.doService(WCserviceAction); // Receiver for write client is started to perform the action defined
}
// Comment following lines till 209 to enable this client to be able to process user defined query
// comment following lines in order to disable this client to perform queries automatically
Message LoadXMLMessage = new Message();
LoadXMLMessage.ToURL = Writeclient.LocalURL;
LoadXMLMessage.FromURL = Writeclient.LocalURL;
string ID = UtilityMethods.urlPort(Writeclient.LocalURL).Substring(2);
LoadXMLMessage.MessageID = "WC" + ID;
LoadXMLMessage.MessageContent = XDocument.Load("WCMessageStream.xml").ToString(); // It is used to load the previously created message stream. It is fed to its processing queue.
MessageStream = LoadXMLMessage; // Reference is saved in order to avoid any loss of information.
WCSender.sendMessage(LoadXMLMessage);
Thread.Sleep(100);
UtilityMethods.waitForUser();
Console.Write("\n\n");
}
