/*
* Copyright (c) 2009, 2012, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*
*
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*/
package com.sun.jmx.remote.internal;
import java.util.Properties;
import java.io.IOException;
import java.rmi.Remote;
import java.rmi.NoSuchObjectException;
import java.security.AccessController;
import java.security.PrivilegedAction;
/**
* A helper class for RMI-IIOP and CORBA APIs.
*/
public final class IIOPHelper {
private IIOPHelper() { }
// loads IIOPProxy implementation class if available
private static final String IMPL_CLASS =
"com.sun.jmx.remote.protocol.iiop.IIOPProxyImpl";
private static final IIOPProxy proxy =
AccessController.doPrivileged(new PrivilegedAction<IIOPProxy>() {
public IIOPProxy run() {
try {
Class<?> c = Class.forName(IMPL_CLASS, true,
IIOPHelper.class.getClassLoader());
return (IIOPProxy)c.newInstance();
} catch (ClassNotFoundException cnf) {
return null;
} catch (InstantiationException e) {
throw new AssertionError(e);
} catch (IllegalAccessException e) {
throw new AssertionError(e);
}
}});
/**
* Returns true if RMI-IIOP and CORBA is available.
*/
public static boolean isAvailable() {
return proxy != null;
}
private static void ensureAvailable() {
if (proxy == null)
throw new AssertionError("Should not here");
}
/**
* Returns true if the given object is a Stub.
*/
public static boolean isStub(Object obj) {
return (proxy == null) ? false : proxy.isStub(obj);
}
/**
* Returns the Delegate to which the given Stub delegates.
*/
public static Object getDelegate(Object stub) {
ensureAvailable();
return proxy.getDelegate(stub);
}
/**
* Sets the Delegate for a given Stub.
*/
public static void setDelegate(Object stub, Object delegate) {
ensureAvailable();
proxy.setDelegate(stub, delegate);
}
/**
* Returns the ORB associated with the given stub
*
* @throws UnsupportedOperationException
* if the object does not support the operation that
* was invoked
*/
public static Object getOrb(Object stub) {
ensureAvailable();
return proxy.getOrb(stub);
}
/**
* Connects the Stub to the given ORB.
*/
public static void connect(Object stub, Object orb)
throws IOException
{
if (proxy == null)
throw new IOException("Connection to ORB failed, RMI/IIOP not available");
proxy.connect(stub, orb);
}
/**
* Returns true if the given object is an ORB.
*/
public static boolean isOrb(Object obj) {
return (proxy == null) ? false : proxy.isOrb(obj);
}
/**
* Creates, and returns, a new ORB instance.
*/
public static Object createOrb(String[] args, Properties props)
throws IOException
{
if (proxy == null)
throw new IOException("ORB initialization failed, RMI/IIOP not available");
return proxy.createOrb(args, props);
}
/**
* Converts a string, produced by the object_to_string method, back
* to a CORBA object reference.
*/
public static Object stringToObject(Object orb, String str) {
ensureAvailable();
return proxy.stringToObject(orb, str);
}
/**
* Converts the given CORBA object reference to a string.
*/
public static String objectToString(Object orb, Object obj) {
ensureAvailable();
return proxy.objectToString(orb, obj);
}
/**
* Checks to ensure that an object of a remote or abstract interface
* type can be cast to a desired type.
*/
public static <T> T narrow(Object narrowFrom, Class<T> narrowTo) {
ensureAvailable();
return proxy.narrow(narrowFrom, narrowTo);
}
/**
* Makes a server object ready to receive remote calls
*/
public static void exportObject(Remote obj) throws IOException {
if (proxy == null)
throw new IOException("RMI object cannot be exported, RMI/IIOP not available");
proxy.exportObject(obj);
}
/**
* Deregisters a server object from the runtime.
*/
public static void unexportObject(Remote obj) throws IOException {
if (proxy == null)
throw new NoSuchObjectException("Object not exported");
proxy.unexportObject(obj);
}
/**
* Returns a stub for the given server object.
*/
public static Remote toStub(Remote obj) throws IOException {
if (proxy == null)
throw new NoSuchObjectException("Object not exported");
return proxy.toStub(obj);
}
}