package transaction;import lockmgr.*;import java.rmi.*;/**  * Resource Manager for the Distributed Travel Reservation System. *  * Description: toy implementation of the RM, for initial testing */public class ResourceManagerImpl     extends java.rmi.server.UnicastRemoteObject    implements ResourceManager {        // in this toy, we don't care about location or flight number    protected int flightcounter, flightprice, carscounter, carsprice, roomscounter, roomsprice;        protected int xidCounter;        public static void main(String args[]) {	System.setSecurityManager(new RMISecurityManager());	String rmiName = System.getProperty("rmiName");	if (rmiName == null || rmiName.equals("")) {	    rmiName = ResourceManager.DefaultRMIName;	}	String rmiRegPort = System.getProperty("rmiRegPort");	if (rmiRegPort != null && !rmiRegPort.equals("")) {	    rmiName = "//:" + rmiRegPort + "/" + rmiName;	}	try {	    ResourceManagerImpl obj = new ResourceManagerImpl();	    Naming.rebind(rmiName, obj);	    System.out.println("RM bound");	} 	catch (Exception e) {	    System.err.println("RM not bound:" + e);	    System.exit(1);	}    }            public ResourceManagerImpl() throws RemoteException {	flightcounter = 0;	flightprice = 0;	carscounter = 0;	carsprice = 0;	roomscounter = 0;	roomsprice = 0;	flightprice = 0;	xidCounter = 1;    }    // TRANSACTION INTERFACE    public int start()	throws RemoteException {	return (xidCounter++);    }    public boolean commit(int xid)	throws RemoteException, 	       TransactionAbortedException, 	       InvalidTransactionException {	System.out.println("Committing");	return true;    }    public void abort(int xid)	throws RemoteException,                InvalidTransactionException {	return;    }    // ADMINISTRATIVE INTERFACE    public boolean addFlight(int xid, String flightNum, int numSeats, int price) 	throws RemoteException, 	       TransactionAbortedException,	       InvalidTransactionException {	flightcounter += numSeats;	flightprice = price;	return true;    }    public boolean deleteFlight(int xid, String flightNum)	throws RemoteException, 	       TransactionAbortedException,	       InvalidTransactionException {	flightcounter = 0;	flightprice = 0;	return true;    }		    public boolean addRooms(int xid, String location, int numRooms, int price) 	throws RemoteException, 	       TransactionAbortedException,	       InvalidTransactionException {	roomscounter += numRooms;	roomsprice = price;	return true;    }    public boolean deleteRooms(int xid, String location, int numRooms) 	throws RemoteException, 	       TransactionAbortedException,	       InvalidTransactionException {	roomscounter = 0;	roomsprice = 0;	return true;    }    public boolean addCars(int xid, String location, int numCars, int price) 	throws RemoteException, 	       TransactionAbortedException,	       InvalidTransactionException {	carscounter += numCars;	carsprice = price;	return true;    }    public boolean deleteCars(int xid, String location, int numCars) 	throws RemoteException, 	       TransactionAbortedException,	       InvalidTransactionException {	carscounter = 0;	carsprice = 0;	return true;    }    public boolean newCustomer(int xid, String custName) 	throws RemoteException, 	       TransactionAbortedException,	       InvalidTransactionException {	return true;    }    public boolean deleteCustomer(int xid, String custName) 	throws RemoteException, 	       TransactionAbortedException,	       InvalidTransactionException {	return true;    }    // QUERY INTERFACE    public int queryFlight(int xid, String flightNum)	throws RemoteException, 	       TransactionAbortedException,	       InvalidTransactionException {	return flightcounter;    }    public int queryFlightPrice(int xid, String flightNum)	throws RemoteException, 	       TransactionAbortedException,	       InvalidTransactionException {	return flightprice;    }    public int queryRooms(int xid, String location)	throws RemoteException, 	       TransactionAbortedException,	       InvalidTransactionException {	return roomscounter;    }    public int queryRoomsPrice(int xid, String location)	throws RemoteException, 	       TransactionAbortedException,	       InvalidTransactionException {	return roomsprice;    }    public int queryCars(int xid, String location)	throws RemoteException, 	       TransactionAbortedException,	       InvalidTransactionException {	return carscounter;    }    public int queryCarsPrice(int xid, String location)	throws RemoteException, 	       TransactionAbortedException,	       InvalidTransactionException {	return carsprice;    }    public int queryCustomerBill(int xid, String custName)	throws RemoteException, 	       TransactionAbortedException,	       InvalidTransactionException {	return 0;    }    // RESERVATION INTERFACE    public boolean reserveFlight(int xid, String custName, String flightNum) 	throws RemoteException, 	       TransactionAbortedException,	       InvalidTransactionException {	flightcounter--;	return true;    }     public boolean reserveCar(int xid, String custName, String location) 	throws RemoteException, 	       TransactionAbortedException,	       InvalidTransactionException {	carscounter--;	return true;    }    public boolean reserveRoom(int xid, String custName, String location) 	throws RemoteException, 	       TransactionAbortedException,	       InvalidTransactionException {	roomscounter--;	return true;    }    // TECHNICAL/TESTING INTERFACE    public boolean shutdown()	throws RemoteException {	System.exit(0);	return true;    }    public boolean dieNow() 	throws RemoteException {	System.exit(1);	return true; // We won't ever get here since we exited above;	             // but we still need it to please the compiler.    }    public boolean dieBeforePointerSwitch() 	throws RemoteException {	return true;    }    public boolean dieAfterPointerSwitch() 	throws RemoteException {	return true;    }}