AccountClientpublic class AccountClient extends Object | AccountClient: A client that looks up the account "named" on the
command-line, then performs the requested transaction on the account. The
supported transactions are "deposit", "withdrawal" and "balance". The "name"
of the account can either be a stringified object reference (in which case
the ORB string_to_object() method is used to locate the referenced object),
or a simple String, in which case the Naming Service accessible from the ORB
is accessed and a lookup made directly with the command-line argument.
USAGE: java AccountClient [corbaloc:...|corbaname:...|IOR:...|]
[deposit | withdrawal | balance] [other Java IDL arguments] |
| Methods Summary |
|---|
| public static void | main(java.lang.String[] args)
// Initialize the ORB
ORB orb = ORB.init(args, null);
org.omg.CORBA.Object ref = null;
// The object name passed in on the command line
String name = args[0];
Account acct = null;
// See if a stringified object reference/URL was provided
if (name.startsWith("corbaname") || name.startsWith("corbaloc")
|| name.startsWith("IOR")) {
System.out.println("Attempting to lookup " + args[0]);
ref = orb.string_to_object(args[0]);
acct = AccountHelper.narrow(ref);
}
// Otherwise, do a traditional Naming Service lookup using the
// services being referenced by our local ORB
else {
try {
ref = orb.resolve_initial_references("NameService");
}
catch (InvalidName invN) {
System.out.println("Couldn't locate a Naming Service");
System.exit(1);
}
NamingContext nameContext = NamingContextHelper.narrow(ref);
NameComponent comp = new NameComponent(args[0], "");
NameComponent path[] = { comp};
try {
ref = nameContext.resolve(path);
System.out.println("ref = " + ref);
acct = AccountHelper.narrow(ref);
}
catch (Exception e) {
System.out
.println("Error resolving name against Naming Service");
e.printStackTrace();
}
}
if (acct != null) {
// We managed to get a reference to the named account, now check the
// requested transaction from the command-line
String action = args[1];
float amt = 0.0f;
if (action.equals("deposit") || action.equals("withdrawal")) {
amt = Float.parseFloat(args[2]);
}
System.out.println("Got account, performing transaction...");
try {
// Did user ask to do a deposit?
if (action.equals("deposit")) {
acct.deposit(amt);
System.out.println("Deposited " + amt + " to account.");
System.out.println("New balance = " + acct.getBalance());
}
// Did user ask to do a withdrawal?
else if (action.equals("withdrawal")) {
acct.withdraw(amt);
System.out.println("Withdrew " + amt + " from account.");
System.out.println("New balance = " + acct.getBalance());
}
// Assume a balance inquiry if neither deposit nor withdrawal
// was given
else {
System.out.println("Current account balance = "
+ acct.getBalance());
}
}
catch (InsufficientFundsException ife) {
System.out.println("Insufficient funds for transaction.");
System.out.println("Current account balance = "
+ acct.getBalance());
}
catch (Exception e) {
System.out
.println("Error occurred while performing transaction:");
e.printStackTrace();
}
}
else {
System.out.println("Null account returned.");
System.exit(1);
}
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