public String toString() {
String s = "[" + helper_type + ";";
for (Enumeration e = seq.elements(); e.hasMoreElements(); ) {
try {
Class c = (Class) e.nextElement();
s += c.getName() + ",";
} catch (NoSuchElementException ee) {
s += "???" + ",";
}
}
return s + "]";
}
private static void checkStub(Remote stub, Class<? extends Remote> stubClass) {
// Check remote stub is from the expected class.
//
if (stub.getClass() != stubClass) {
if (!Proxy.isProxyClass(stub.getClass())) {
throw new SecurityException("Expecting a " + stubClass.getName() + " stub!");
} else {
InvocationHandler handler = Proxy.getInvocationHandler(stub);
if (handler.getClass() != RemoteObjectInvocationHandler.class) {
throw new SecurityException(
"Expecting a dynamic proxy instance with a "
+ RemoteObjectInvocationHandler.class.getName()
+ " invocation handler!");
} else {
stub = (Remote) handler;
}
}
}
// Check RemoteRef in stub is from the expected class
// "sun.rmi.server.UnicastRef2".
//
RemoteRef ref = ((RemoteObject) stub).getRef();
if (ref.getClass() != UnicastRef2.class) {
throw new SecurityException(
"Expecting a " + UnicastRef2.class.getName() + " remote reference in stub!");
}
// Check RMIClientSocketFactory in stub is from the expected class
// "javax.rmi.ssl.SslRMIClientSocketFactory".
//
LiveRef liveRef = ((UnicastRef2) ref).getLiveRef();
RMIClientSocketFactory csf = liveRef.getClientSocketFactory();
if (csf == null || csf.getClass() != SslRMIClientSocketFactory.class) {
throw new SecurityException(
"Expecting a "
+ SslRMIClientSocketFactory.class.getName()
+ " RMI client socket factory in stub!");
}
}
/**
* Contact a belief network context, get the helper list, and search the list to see if there's a
* helper which matches the type sequence specified. If there's more than one helper which
* matches, find the ``best fit.''
*
* <p>The class and count scores of the best-fitting helper class are written into
* <tt>max_class_score[0]</tt> and <tt>max_count_score[0]</tt>, respectively.
*/
public static Class find_helper_class0(
Vector seq, String helper_type, int[] max_class_score, int[] max_count_score)
throws ClassNotFoundException {
long t0 = System.currentTimeMillis();
if (bnc != null) // make sure the reference is still alive
try {
bnc.get_name();
} catch (RemoteException e) {
bnc = null;
}
if (bnc == null) // need to locate a context
{
String cb = System.getProperty("java.rmi.server.codebase", "http://localhost");
long tt0 = System.currentTimeMillis();
try {
bnc = BeliefNetworkContext.locate_context(new URL(cb).getHost());
} catch (Exception e) {
throw new ClassNotFoundException("nested: " + e);
}
}
String[] helperlist;
try {
helperlist = bnc.get_helper_names(helper_type);
} catch (RemoteException e) {
throw new ClassNotFoundException("bnc.get_helper_names failed");
}
int[] class_score1 = new int[1], count_score1 = new int[1];
max_class_score[0] = -1;
max_count_score[0] = -1;
Class cmax_score = null;
for (int i = 0; i < helperlist.length; i++) {
try {
Class c = RMIClassLoader.loadClass(helperlist[i]);
SeqTriple[] sm = (SeqTriple[]) invoke_description(c);
if (sm == null) continue; // apparently not a helper class
if (MatchClassPattern.matches(sm, seq, class_score1, count_score1)) {
if (class_score1[0] > max_class_score[0]
|| (class_score1[0] == max_class_score[0] && count_score1[0] > max_count_score[0])) {
cmax_score = c;
max_class_score[0] = class_score1[0];
max_count_score[0] = count_score1[0];
}
}
} catch (Exception e2) {
System.err.println("PiHelperLoader: attempt to load " + helperlist[i] + " failed; " + e2);
}
}
if (cmax_score == null) {
System.err.println("find_helper_class0: failed; helper list:");
for (int i = 0; i < helperlist.length; i++) System.err.println("\t" + helperlist[i]);
String s = "";
for (Enumeration e = seq.elements(); e.hasMoreElements(); ) {
try {
Class c = (Class) e.nextElement();
s += c.getName() + ",";
} catch (NoSuchElementException ee) {
s += "???" + ",";
}
}
throw new ClassNotFoundException("no " + helper_type + " helper for sequence [" + s + "]");
}
// FOR NOW IGNORE THE POSSIBILITY OF TWO OR MORE MATCHES !!!
return cmax_score;
}