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Java example source code file (StubInvocationHandlerImpl.java)

This example Java source code file (StubInvocationHandlerImpl.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

applicationexception, corba, corbaclientdelegate, corbacontactinfolist, invocationtargetexception, object, presentationmanager, privilegedaction, proxy, reflection, remarshalexception, rmi, security, securitymanager, stubinvocationhandlerimpl, systemexception, threaddeath, throwable

The StubInvocationHandlerImpl.java Java example source code

/*
 * Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.corba.se.impl.presentation.rmi ;

import java.security.AccessController;
import java.security.PrivilegedAction;

import java.lang.reflect.Method ;
import java.lang.reflect.InvocationHandler ;
import java.lang.reflect.Proxy ;
import java.lang.reflect.InvocationTargetException ;

import java.io.ObjectInputStream ;
import java.io.ObjectOutputStream ;
import java.io.IOException ;

import java.rmi.Remote ;

import javax.rmi.CORBA.Util ;

import org.omg.CORBA.portable.ObjectImpl ;
import org.omg.CORBA.portable.Delegate ;
import org.omg.CORBA.portable.ServantObject ;
import org.omg.CORBA.portable.ApplicationException ;
import org.omg.CORBA.portable.RemarshalException ;

import org.omg.CORBA.SystemException ;

import com.sun.corba.se.spi.orb.ORB ;

import com.sun.corba.se.pept.transport.ContactInfoList ;

import com.sun.corba.se.spi.transport.CorbaContactInfoList ;

import com.sun.corba.se.spi.protocol.CorbaClientDelegate ;
import com.sun.corba.se.spi.protocol.LocalClientRequestDispatcher ;

import com.sun.corba.se.spi.presentation.rmi.IDLNameTranslator ;
import com.sun.corba.se.spi.presentation.rmi.DynamicMethodMarshaller ;
import com.sun.corba.se.spi.presentation.rmi.PresentationManager ;
import com.sun.corba.se.spi.presentation.rmi.StubAdapter ;

import com.sun.corba.se.spi.orbutil.proxy.InvocationHandlerFactory ;
import com.sun.corba.se.spi.orbutil.proxy.LinkedInvocationHandler ;

import com.sun.corba.se.impl.corba.CORBAObjectImpl ;

public final class StubInvocationHandlerImpl implements LinkedInvocationHandler
{
    private transient PresentationManager.ClassData classData ;
    private transient PresentationManager pm ;
    private transient org.omg.CORBA.Object stub ;
    private transient Proxy self ;

    public void setProxy( Proxy self )
    {
        this.self = self ;
    }

    public Proxy getProxy()
    {
        return self ;
    }

    public StubInvocationHandlerImpl( PresentationManager pm,
        PresentationManager.ClassData classData, org.omg.CORBA.Object stub )
    {
        SecurityManager s = System.getSecurityManager();
        if (s != null) {
            s.checkPermission(new DynamicAccessPermission("access"));
        }
        this.classData = classData ;
        this.pm = pm ;
        this.stub = stub ;
    }

    private boolean isLocal()
    {
        boolean result = false ;
        Delegate delegate = StubAdapter.getDelegate( stub ) ;

        if (delegate instanceof CorbaClientDelegate) {
            CorbaClientDelegate cdel = (CorbaClientDelegate)delegate ;
            ContactInfoList cil = cdel.getContactInfoList() ;
            if (cil instanceof CorbaContactInfoList) {
                CorbaContactInfoList ccil = (CorbaContactInfoList)cil ;
                LocalClientRequestDispatcher lcrd =
                    ccil.getLocalClientRequestDispatcher() ;
                result = lcrd.useLocalInvocation( null ) ;
            }
        }

        return result ;
    }

    /** Invoke the given method with the args and return the result.
     *  This may result in a remote invocation.
     *  @param proxy The proxy used for this class (null if not using java.lang.reflect.Proxy)
     */
    public Object invoke( Object proxy, final Method method,
        Object[] args ) throws Throwable
    {
        String giopMethodName = classData.getIDLNameTranslator().
            getIDLName( method )  ;
        DynamicMethodMarshaller dmm =
            pm.getDynamicMethodMarshaller( method ) ;

        Delegate delegate = null ;
        try {
            delegate = StubAdapter.getDelegate( stub ) ;
        } catch (SystemException ex) {
            throw Util.mapSystemException(ex) ;
        }

        if (!isLocal()) {
            try {
                org.omg.CORBA_2_3.portable.InputStream in = null ;
                try {
                    // create request
                    org.omg.CORBA_2_3.portable.OutputStream out =
                        (org.omg.CORBA_2_3.portable.OutputStream)
                        delegate.request( stub, giopMethodName, true);

                    // marshal arguments
                    dmm.writeArguments( out, args ) ;

                    // finish invocation
                    in = (org.omg.CORBA_2_3.portable.InputStream)
                        delegate.invoke( stub, out);

                    // unmarshal result
                    return dmm.readResult( in ) ;
                } catch (ApplicationException ex) {
                    throw dmm.readException( ex ) ;
                } catch (RemarshalException ex) {
                    return invoke( proxy, method, args ) ;
                } finally {
                    delegate.releaseReply( stub, in );
                }
            } catch (SystemException ex) {
                throw Util.mapSystemException(ex) ;
            }
        } else {
            // local branch
            ORB orb = (ORB)delegate.orb( stub ) ;
            ServantObject so = delegate.servant_preinvoke( stub, giopMethodName,
                method.getDeclaringClass() );
            if (so == null) {
                return invoke( stub, method, args ) ;
            }
            try {
                Object[] copies = dmm.copyArguments( args, orb ) ;

                if (!method.isAccessible()) {
                    // Make sure that we can invoke a method from a normally
                    // inaccessible package, as this reflective class must always
                    // be able to invoke a non-public method.
                    AccessController.doPrivileged(new PrivilegedAction() {
                        public Object run() {
                            method.setAccessible( true ) ;
                            return null ;
                        }
                    } ) ;
                }

                Object result = method.invoke( so.servant, copies ) ;

                return dmm.copyResult( result, orb ) ;
            } catch (InvocationTargetException ex) {
                Throwable mex = ex.getCause() ;
                // mex should never be null, as null cannot be thrown
                Throwable exCopy = (Throwable)Util.copyObject(mex,orb);
                if (dmm.isDeclaredException( exCopy ))
                    throw exCopy ;
                else
                    throw Util.wrapException(exCopy);
            } catch (Throwable thr) {
                if (thr instanceof ThreadDeath)
                    throw (ThreadDeath)thr ;

                // This is not a user thrown exception from the
                // method call, so don't copy it.  This is either
                // an error or a reflective invoke exception.
                throw Util.wrapException( thr ) ;
            } finally {
                delegate.servant_postinvoke( stub, so);
            }
        }
    }
}

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