// add the new user to the encrypted users file which has the detailed stats for all users
// synchronize to make sure that only one thread can be inside this block at a time.
public static synchronized String addUserAndIssueCode(UserStats stats)
throws IOException, GeneralSecurityException, ClassNotFoundException, NoMoreCodesException {
// ok, now we have a list of stats objects, representing all users.
// add this user to the list.
// the code assigned to this user will simply be codes.get(users.size())
// but do an error check first to be sure we're not out of codes
List<UserStats> users = readUsersFile();
if (users.size() >= MemoryStudy.codes.size()) {
log.warn("NOC WARNING: codes file exhausted!!!!");
throw new NoMoreCodesException();
}
// ok, we have enough codes, just give out one
String passkey = MemoryStudy.codes.get(users.size());
int USERID_BASE =
100; // userid numbering starts from USERID_BASE, new id is base + # existing codes
stats.userid = Integer.toString(USERID_BASE + users.size());
stats.code = passkey;
users.add(stats);
// encrypt and write the users file back
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(users);
oos.close();
CryptoUtils.writeEncryptedBytes(baos.toByteArray(), USERS_FILE);
return passkey;
}
public void recordStartTime() {
stats.starttime = new Date().getTime();
}
/*checks whether the test is done. if it is, it outputs the final log info and does time calculations*/
public boolean checkForFinish() {
if (questionIndex > questions.size()) {
stats.endtime = new Date().getTime();
return true;
} else return false;
}