added new constants TYPE_ONLINE and TYPE_OFFLINE also new method returnFileType() which is a helper method to determine whether its an online file or offline file
For methods which take in an ID (type Long) as a parameter, a check is now performed to see if they are null or not. if they are null then an exception is thrown
new methods calculateTotalNumberOfUsers getSessionIdsFromContent getNumberOfUsersInSession Which is used to generate the statistics in the monitoring environment