//this will call by local to send add request to others and will wait to get back all permissions
//and watch the currentAddRequest at the top of the queue in a while loop
//Actually in a while loop it will check the list of its tail and
//if all of them are ok it will check the top of the queue
//So in this way client thread will become lock here until start adding process
public void sendAddPermissionRequest(HpnXmlRpcClient hpnXmlRpcClient)//client agent for sending message to other hosts
{
Console.WriteLine("* Mutual Exclusion Algorithm <<R&A>> has started.");
currentAddRequest = new RequestObject(); //Make a new request with [LC = LC + 1]{means increased clock before send request} for getting add permission
addRequestsQueue.add(currentAddRequest); //put the request in your own queue
hpnXmlRpcClient.sendAddMutualExclusionRequest(currentAddRequest); //send the new add request to all other hosts
Console.WriteLine("* Now we will wait for OK responses from other hosts!");
bool flag = true;
while (flag)
{
lock (this)
{
flag = currentAddRequest.isWaiting();
}
}//sit back and wait for OK from all processes
Console.WriteLine("* Now we will have this permission to go to the critical section.");
//After this function you can go to the critical section
}
public void sendReleaseMessage(HpnXmlRpcClient hpnXmlRpcClient)//client agent for sending message to other hosts
{
Console.WriteLine("* Now we have come out from the critical section.");
//After the critical section this function will call by this machine
//Upon exiting the critical section,
//remove request from the queue and
Console.WriteLine("* Sending OK message to all requests that are available in the Priority Queue has started.");
RequestObject obj = addRequestsQueue.remove();
while (obj != null)
{
//send release message to every process that are remaining in the queue
//send OK to all processes in queue and empty queue
if (obj.isExternalRequester())
{
hpnXmlRpcClient.sendAddCriticalSectionReleased(obj); //send the new add request released
}
obj = addRequestsQueue.remove();
}
currentAddRequest = null;
Console.WriteLine("* Mutual Exclusion Algorithm has finished.");
}
static void Main(string[] args)
{
calendar = new Calendar(filepath);
hostsList = new HostsList();
try
{
Console.WriteLine(" <<< Welcome to HPN Calendar System >>> ");
Console.WriteLine(" <<< Version TUMS 1.0 >>> ");
Console.WriteLine("____________________________________________________");
Console.WriteLine("In which port number you want to run this host?");
Console.WriteLine("The port number must be between 1025 & 65535.");
Console.WriteLine("Default port number is {0}. Enter 0 to use default.", DefaultPort.portNumber);
Console.WriteLine("Enter -1 to exit program.");
Console.Write("Please enter the port number : ");
int port = Reader.nextInt();
while ((port < 1025 || port > 65535) && port > 0)
{
Console.WriteLine("The port number that you have entered is not valid.");
Console.Write("Please enter the port number : ");
port = Reader.nextInt();
}
if (port < 0)
{
Console.WriteLine("The HPN Calendar System has stoped by user.");
Environment.Exit(0);
}
else if (port == 0)
{
port = DefaultPort.portNumber;
}
Console.WriteLine("The port number has assigned to : " + port);
server = new HpnXmlRpcServer(port);
server.Add("Calendar", calendar);
server.Add("CalendarNetwork", hostsList);
server.startServing(); //Start the xml-rpc server for test.
Console.WriteLine("The XML-RPC server has checked : Ok.");
Console.WriteLine("The host has run on this address : http://" + LocalNet.IpAddress + ":" + port + "/");
//the local host must be add to the host list as a host.
//but not here, when we make the client instance so we will pass the port number
//and then in the hpn.cs.xml.client.HpnXmlRpcClient class in its contractor will add the local host and its port to the host list
while (true)
{
Console.Write("Do you want to create a new Calendar Network? [Y/N] : ");
char response = Reader.nextChar();
if (response == 'n' || response == 'N')
{
server.signOff(); //Sign off the server to show the joining menu
Console.WriteLine("The host is working in its offline mode, to connect to an existing network please use the following command list.");
break;
}
else if (response == 'y' || response == 'Y')
{
break;
}
else
{
Console.WriteLine("The character that you have entered ['" + response + "'] is not correct. You can just enter a character from the set {'n','N','y','Y'}.");
}
}
//The port of this machine must be send to register the local host as the first host in the host list
//And the calendar must be send to be able to get the list of appointments in offline mode because in offline mode
//the local server is signed off and can't response to the local client requests.
client = HpnXmlRpcClient.getHpnXmlRpcClient(port, calendar);
while (true)
{
client.controlPanel();
}
} catch (Exception e) {
Console.WriteLine(e.Message);
} //End of try
}//End of main
