private String appointmentsSerialize()
{
//make a serialized list of all appointments to send to a new host when it request after joining
String response = " SequentialNum:&@[" + SequentialNumber.getNextSequentialNumber() + "]#! " + "\n";
foreach (Appointment appointment in appointmentsList)
{
response += appointment.serialize();
}
return(response);
}
private String appointmentsSerialize()
{
//make a serialized list of all appointments to send to a new host when it request after joining
String response = " SequentialNum:&@[" + SequentialNumber.getNextSequentialNumber() + "]#! " + "\n"
+ " LogicalClock:&@[" + LogicalClock.nextLogicalClock() + "]#! " + "\n"; //For Mutual Exclusion //the clock has modified here before sending sync string
foreach (Appointment appointment in appointmentsList)
{
response += appointment.serialize();
}
return(response);
}
//@Override
public int createNewAppointment(String dateTimeString, int secDurationInt, String header, String comment) //call by this client but throw XML-RPC
{
//call by the client of the current machine to make a new appointment
//it must return unique sequence number of the new appointment or -1 if it fail to add
//because in C# XmlRpcServer Library stoping the servicing has an error we refuse the incoming requests if the server
//is not in its online mode.
if (!ServerStatus.getServerStatus())
{
return(-1);
}
Date dateTime;
Integer secDuration;
try
{
dateTime = new Date(dateTimeString);
secDuration = new Integer(secDurationInt);
}
catch (System.Exception e)
{
Console.WriteLine(e.Message);
return(-1);
}
//throwing an exception has sence or meaning here
//because this function will call locally
if (secDuration.intValue() < 1)
{
throw new System.ArgumentOutOfRangeException("The seconds of duration[secDuration] must be greater than 0.");
}
//Create a new seqNumber and add the appointment to the array list!
try
{
SequentialNumber sqn = new SequentialNumber();
Appointment appointment = new Appointment(sqn, dateTime, secDuration.intValue(), header, comment);
this.appointmentsList.Add(appointment);
Console.WriteLine("\n_______________________________");
Console.WriteLine("You have made a new appointment on this host successfully.\n" + appointment.ToString());
this.setLastModified();
this.updateLocalDatabase();
return(sqn.getSequentialNumber());
}
catch (System.IndexOutOfRangeException e) //for creating sequential number
{
Console.WriteLine(e.Message);
return(-1);
}
}
//Constructor section
public Appointment(SequentialNumber seqNumber, Date dateTime, int secDuration, String header, String comment)
{
this.seqNumber = seqNumber;
try
{
this.setDateTime(dateTime);
this.setSecDuration(secDuration);
}
catch (System.ArgumentOutOfRangeException e)
{
Console.WriteLine(e.Message);
}
this.setHeader(header);
this.setComment(comment);
}
private void updateLocalDatabase()
{
//Write the current calendar's appointments on a file in hard disk after each change
List <String> aLines = new List <String>();
aLines.Add(" HPN Calendar Network Version TUMS " + "\n");
aLines.Add(" Modify:&@[" + this.getLastModifiedString() + "]#! " + "\n");
aLines.Add(" SequentialNum:&@[" + SequentialNumber.getNextSequentialNumber() + "]#! " + "\n");
aLines.Add(" Appointments:&@[" + this.appointmentsList.Count + "]#! " + "\n");
foreach (Appointment appointment in this.appointmentsList)
{
aLines.Add(appointment.serialize());
}
try {
this.databaseFile.writeFile(aLines);
}
catch (System.IO.IOException e)
{
Console.WriteLine("Problem in writing to database file : " + e.Message);
}
}
//@Override
public bool addNewAppointment(int seqNumberInt, String dateTimeString, int secDurationInt, String header, String comment)
{
//call by other clients to send a new appointment
//because in C# XmlRpcServer Library stoping the servicing has an error we refuse the incoming requests if the server
//is not in its online mode.
if (!ServerStatus.getServerStatus())
{
return(false);
}
Integer seqNumber;
Date dateTime;
Integer secDuration;
try
{
seqNumber = new Integer(seqNumberInt);
dateTime = new Date(dateTimeString);
secDuration = new Integer(secDurationInt);
}
catch (System.Exception)
{
//Console.WriteLine("\nOne request for adding a new appointment to the current system has received but in converting the data in has crashed by the following exception : ");
//Console.WriteLine("Exception Message : \n" + e.Message);
//Console.WriteLine("Received Data : " + "\nSeqential Number : " + seqNumberInt + "\nDate : " + dateTimeString + "\nDuration " + secDurationInt + "\nHeader" + header + "\nComment" + comment);
return(false);
}
if (seqNumber.intValue() < 1)
{
//because it will called by remote host throwing exception is meaning less.
//throw new System.ArgumentOutOfRangeException("The sequential number[seqNumber] must be greater than 0.");
//Console.WriteLine("\nOne request for adding a new appointment to the current system has received but the sequential number was invalid.");
//Console.WriteLine("Received Data : " + "\nSeqential Number : " + seqNumberInt + "\nDate : " + dateTimeString + "\nDuration " + secDurationInt + "\nHeader" + header + "\nComment" + comment);
return(false);
}
else if (secDuration.intValue() < 1)
{
//throw new System.ArgumentOutOfRangeException("The seconds of duration[secDuration] must be greater than 0.");
//Console.WriteLine("\nOne request for adding a new appointment to the current system has received but the duration number was invalid.");
//Console.WriteLine("Received Data : " + "\nSeqential Number : " + seqNumberInt + "\nDate : " + dateTimeString + "\nDuration " + secDurationInt + "\nHeader" + header + "\nComment" + comment);
return(false);
}
//Create requested sequence number or a new sequence number and add the appointment to the array list.
try
{
//We make the sequential number and then check for its existance
//if the sequential number is exist then we make a new one and it will continue till get a unique sequential number
//another strategy for here can be to return false if we have the current sequential number in this host
//but we think it is better to not lose any apointment even with registering it with a wrong sequential number
//but based on what said in the assignment sheet
//we must not consider the conflict of the concurrency of the creation of appointments
SequentialNumber sqn = new SequentialNumber(seqNumber.intValue());
bool flag;
do
{
flag = false;
foreach (Appointment tempAppointment in this.appointmentsList) //search to sure about non existence of the new sequence number in appointment list
{
if (tempAppointment.getSequentialNumber() == sqn.getSequentialNumber())
{
sqn = new SequentialNumber();
flag = true;
break;
}
}
}while(flag);
if (sqn.getSequentialNumber() != seqNumber.intValue())
{
Console.WriteLine("Remote addAppointment: The sequance number [" + seqNumber.intValue() + "] that has been sent by a remote host, is exist. So a new sequance number has assigned : " + sqn.getSequentialNumber());
}
Appointment appointment = new Appointment(sqn, dateTime, secDuration.intValue(), header, comment);
this.appointmentsList.Add(appointment);
if (this.appointmentsList.Exists(temp => temp == appointment)) //if the add was successful?
{
//This will show when a far host add an appointment to the list
//Console.WriteLine("");
//Console.WriteLine("_______________________________");
//Console.WriteLine("One appointment has been added.");
//Console.WriteLine("-------------------------------");
//Console.WriteLine(appointment.ToString());
this.setLastModified();
this.updateLocalDatabase();
return(true);
}
else
{
return(false);
}
}
catch (System.IndexOutOfRangeException) //for creating sequential number
{
//Console.WriteLine(e.Message);
return(false);
}
}
private Date loadLocalDatabase()
{
//Read the current database at the starting time to initiate the appointmentList
Date lastModifiedDate = null;
Regex regex = null;
Match matcher = null;
try
{
List <String> lines = this.databaseFile.readFile();
if (lines != null)
{
regex = new Regex(" HPN Calendar Network Version TUMS ");
if (lines.Count > 0 && regex.IsMatch(lines[0])) //Recognize the file header
{
if (lines.Count > 3)
{
//Extracting second line : Modification dateTime
regex = new Regex("Modify:&@\\[(.*?)\\]#!");
matcher = regex.Match(lines[2]);
if (matcher.Success)
{
String lastModificationString = matcher.Groups[1].Value;
lastModifiedDate = new Date(lastModificationString, DateString.Format);
}
regex = new Regex("SequentialNum:&@\\[(.*?)\\]#!");
matcher = regex.Match(lines[4]);
if (matcher.Success)
{
try
{
String SequentialNum = matcher.Groups[1].Value;
int seqNumber = Integer.parseInt(SequentialNum);
SequentialNumber.setNextSequentialNumber(seqNumber);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
String seqNum, header, date, time, duration, comment;
for (int index = 8; index < lines.Count; index += 2)
{
String line = lines[index];
seqNum = null;
header = null;
date = null;
time = null;
duration = null;
comment = null;
//
regex = new Regex("SeqNum:&@\\[(.*?)\\]#!");
matcher = regex.Match(line);
if (matcher.Success)
{
seqNum = matcher.Groups[1].Value;
}
//
regex = new Regex("Header:&@\\[(.*?)\\]#!");
matcher = regex.Match(line);
if (matcher.Success)
{
header = matcher.Groups[1].Value;
}
//
regex = new Regex("Date:&@\\[(.*?)\\]#!");
matcher = regex.Match(line);
if (matcher.Success)
{
date = matcher.Groups[1].Value;
}
//
regex = new Regex("Time:&@\\[(.*?)\\]#!");
matcher = regex.Match(line);
if (matcher.Success)
{
time = matcher.Groups[1].Value;
}
//
regex = new Regex("Duration:&@\\[(.*?)\\]#!");
matcher = regex.Match(line);
if (matcher.Success)
{
duration = matcher.Groups[1].Value;
}
//
regex = new Regex("Comment:&@\\[(.*?)\\]#!");
matcher = regex.Match(line);
if (matcher.Success)
{
comment = matcher.Groups[1].Value;
}
if (seqNum != null && header != null && date != null && time != null && duration != null && comment != null)
{
try
{
Integer seqNumber = new Integer(seqNum);
Integer secDuration = new Integer(duration);
Date dateTime = new Date(date + " " + time, DateString.Format);
SequentialNumber sqn = new SequentialNumber(seqNumber.intValue());
Appointment appointment = new Appointment(sqn, dateTime, secDuration.intValue(), header, comment);
this.addDatabaseAppointment(appointment);
}
catch (System.Exception e) {
Console.WriteLine(e.Message);
}
}
} //End for
}
}
}
} catch (System.IO.IOException e) {
Console.WriteLine("Problem in reading from database file : " + e.Message);
}
return(lastModifiedDate);
}
