/**
* Initialize the communication with OMC.
*
* @throws ConnectException if we're unable to start communicating with the server
*/
private void init() throws ConnectException {
/*
* Get type of operating system, used for finding object
* reference and starting OMC if the reference is faulty
*/
os = getOs();
/* See if an OMC server is already running */
File f = new File(getPathToObject());
String stringifiedObjectReference = null;
if (!f.exists()) {
/* If a server isn't running, start it */
logOMCStatus("No OMC object reference found, starting server.");
startServer();
} else {
logOMCStatus("Old OMC CORBA object reference present," + " assuming OMC is running.");
}
/* Read in the CORBA OMC object from a file on disk */
stringifiedObjectReference = readObjectFromFile();
/*
* Setup up OMC object reference by initializing ORB and then
* converting the string object to a real CORBA object.
*/
setupOmcc(stringifiedObjectReference);
try {
/*
* Test the server by trying to send an expression to it.
* This might fail if the object reference found on disk didn't
* have a corresponding server running. If a server is missing,
* catch an exception and try starting a server.
*/
logOMCStatus("Trying to send expression to OMC.");
omcc.sendExpression("1+1");
logOMCStatus("Expression sent successfully.");
} catch (org.omg.CORBA.COMM_FAILURE e) {
/* Start server and set up omcc */
logOMCStatus("Failed sending expression, will try to start OMC.");
existingCorbaFileIsNew = false;
startServer();
stringifiedObjectReference = readObjectFromFile();
setupOmcc(stringifiedObjectReference);
try {
/* Once again try to send an expression to OMC. If it fails this
* time it's time to send back an exception to the caller of
* this function. */
logOMCStatus("Trying to send expression to OMC.");
omcc.sendExpression("1+1");
logOMCStatus("Expression sent successfully.");
} catch (org.omg.CORBA.COMM_FAILURE x) {
logOMCStatus("Failed sending expression, giving up.");
throw new ConnectException("Unable to start the OpenModelica Compiler.");
}
}
hasInitialized = true;
}
// TODO add synchronization so that two threads don't fudge up each others
// communication with OMC
// old synchronization aka 'private synchronized String sendExpression(String exp)'
// doesnt work when there is possibility of multiple instances of OMCProxy objects
public String sendExpression(String exp) throws ConnectException {
String retval = null;
if (hasInitialized == false) {
init();
}
try {
logOMCCall(exp);
retval = omcc.sendExpression(exp);
logOMCReply(retval);
} catch (org.omg.CORBA.COMM_FAILURE x) {
logOMCCallError("Error while sending expression " + exp + " [" + x + "]");
/* lost connection to OMC or something */
throw new ConnectException(
"Couldn't send expression to the " + "OpenModelica Compiler. Tried sending: " + exp);
}
return retval;
}
