BankImpl.java

package org.jacorb.demo.bank.transaction.explicit;

import org.omg.CORBA.*;
import org.omg.CORBA.ORBPackage.*;
import org.omg.CosTransactions.*;
import org.omg.CosNaming.*;

import java.io.*;

public class BankImpl
    extends TheBankPOA
{
    private ORB orb;
    private org.omg.PortableServer.POA poa;
    private Control control = null;

    public BankImpl( ORB orb, org.omg.PortableServer.POA poa )
    {
	this.orb = orb;
	this.poa = poa;
    }

    public Account open(String name, float initial_deposit)
    {
	try
	{
	    AccountImpl acc = new AccountImpl(orb, name, initial_deposit);
	    org.omg.CORBA.Object o = poa.servant_to_reference(acc);
	    return acc._this(orb);
	}
	catch( Exception e )
	{
            e.printStackTrace();
	    throw new org.omg.CORBA.UNKNOWN();
	}
    }

    public void transfer( Account source, Account destination, float amount )
	throws InsufficientFunds
    {
	try
	{
	    // obtain transaction factory object from naming service
	    NamingContextExt nc =
		NamingContextExtHelper.narrow(orb.resolve_initial_references("NameService"));
	    NameComponent [] name = new NameComponent[1];
	    name[0] = new NameComponent( "TransactionService", "service");

	    TransactionFactory transactionFactory =
		TransactionFactoryHelper.narrow( nc.resolve(name));

	    // start a new transaction
	    System.err.println("begin transaction");

	    // obtain control object
	    control = transactionFactory.create(20);

	    source.debit( amount, control );

	    System.err.println("debited");

	    destination.credit( amount, control );

	    System.err.println("credited");

	    // commit the transaction
	    System.err.println("commit transaction");
	    control.get_terminator().commit( true );
	    System.err.println("transaction comitted");
	}
	catch( InsufficientFunds isf )
	{
	    try
	    {
		control.get_terminator().rollback();
	    }
	    catch(  org.omg.CosTransactions.Unavailable  nt )
	    {
		System.err.println("No transaction - give up: " + nt );
		System.exit( 1 );
	    }
	    throw( isf );
	}
	catch( InvalidName in )
	{
	    System.err.println("Initialization failure: " + in );
	    System.exit( 1 );
	}
	catch( UserException ue )
	{
	    System.err.println("transactional failure - give up: " + ue );
	    System.exit( 1 );
	}
	catch( SystemException se )
	{
	    System.err.println("system exception - rollback transaction: " + se );
	    try
	    {
		control.get_terminator().rollback();
	    }
	    catch(  org.omg.CosTransactions.Unavailable  nt )
	    {
		System.err.println("No transaction - give up: " + nt );
		System.exit( 1 );
	    }
	    throw( se );
	}
    }


}