private void processNextClientRequest() {
QueueEntry qe = (QueueEntry) qClientRequests.poll();
if (qe != null) {
EventSocket sock = qe.sock;
String message = qe.message;
boolean isAllowed = false;
LockHolder lock = getLockForCommand(message);
if (lock != null) {
// if the lock exists check whether the user is allowed to use this command
int[] privs = lock.getAllowedPrivileges();
for (int priv : privs) if (priv == sock.getPrivilege()) isAllowed = true;
if (isAllowed) {
if (lockHolder == null) { // if no lock is set we try to execute the command
setLock(lock.setLockAction(message));
Debg.print("lock set and executed");
} else { // if a lock is already set the command might contain an abort message
String cmd = Parser.getValue(message, NanoComm.COMMAND_CMD);
String[] abortCmds = lockHolder.getAbortCommands();
boolean isAbortable = false;
if (abortCmds != null)
for (int i = 0; i < abortCmds.length; i++) {
if (cmd.equals(abortCmds[i])) isAbortable = true;
}
if (isAbortable) {
setLock(lockHolder.takeAbortActions("Overwriting command has been sent"));
} else sock.sendClientInfo("Please be patient, the remote experiment is still busy");
}
} else sock.sendClientInfo("Sorry, you are not allowed to use this command!");
} else Debg.print("No lock found for: " + message);
}
if (qClientRequests.size() > 10) {
Debg.err(
"I have been flooded by "
+ qClientRequests.size()
+ " client requests! I dropped everything except for the oldest one");
qe = (QueueEntry) qClientRequests.poll();
qClientRequests.clear();
qClientRequests.add(qe);
}
}
/**
* Searches for the LockHolder associated with the value for the command tag.
*
* @param msg The string holding the command=value pair.
* @return The LockHolder if the command exists, or null.
*/
public synchronized LockHolder getLockForCommand(String msg) {
String cmd = Parser.getValue(msg, NanoComm.COMMAND_CMD);
if (cmd != null) return commandLocks.get(cmd);
else return null;
}