Java example source code file (LocalClientRequestDispatcherBase.java)

This example Java source code file (LocalClientRequestDispatcherBase.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

class, ior, localclientrequestdispatcher, localclientrequestdispatcherbase, objectadapterfactory, objectadapterid, objectid, objectkeytemplate, orb, requestdispatcherregistry, servantobject, taggedprofile, threadlocal

The LocalClientRequestDispatcherBase.java Java example source code

/*
 * Copyright (c) 2002, 2012, 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.protocol;

import org.omg.CORBA.portable.ServantObject;

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

import com.sun.corba.se.spi.orb.ORB;
import com.sun.corba.se.spi.ior.IOR ;
import com.sun.corba.se.spi.oa.ObjectAdapterFactory;

import com.sun.corba.se.spi.ior.ObjectAdapterId;
import com.sun.corba.se.spi.ior.TaggedProfile;
import com.sun.corba.se.spi.ior.ObjectKeyTemplate;
import com.sun.corba.se.spi.ior.ObjectId;

public abstract class LocalClientRequestDispatcherBase implements LocalClientRequestDispatcher
{
    protected ORB orb;
    int scid;

    // Cached information needed for local dispatch
    protected boolean servantIsLocal ;
    protected ObjectAdapterFactory oaf ;
    protected ObjectAdapterId oaid ;
    protected byte[] objectId ;

    // If isNextIsLocalValid.get() == Boolean.TRUE,
    // the next call to isLocal should be valid
    private static final ThreadLocal isNextCallValid = new ThreadLocal() {
            protected synchronized Object initialValue() {
                return Boolean.TRUE;
            }
        };

    protected LocalClientRequestDispatcherBase(ORB orb, int scid, IOR ior)
    {
        this.orb = orb ;

        TaggedProfile prof = ior.getProfile() ;
        servantIsLocal = orb.getORBData().isLocalOptimizationAllowed() &&
            prof.isLocal();

        ObjectKeyTemplate oktemp = prof.getObjectKeyTemplate() ;
        this.scid = oktemp.getSubcontractId() ;
        RequestDispatcherRegistry sreg = orb.getRequestDispatcherRegistry() ;
        oaf = sreg.getObjectAdapterFactory( scid ) ;
        oaid = oktemp.getObjectAdapterId() ;
        ObjectId oid = prof.getObjectId() ;
        objectId = oid.getId() ;
    }

    public byte[] getObjectId()
    {
        return objectId ;
    }

    public boolean is_local(org.omg.CORBA.Object self)
    {
        return false;
    }

    /*
    * Possible paths through
    * useLocalInvocation/servant_preinvoke/servant_postinvoke:
    *
    * A: call useLocalInvocation
    * If useLocalInvocation returns false, servant_preinvoke is not called.
    * If useLocalInvocation returns true,
    * call servant_preinvoke
    *   If servant_preinvoke returns null,
    *       goto A
    *   else
    *       (local invocation proceeds normally)
    *       servant_postinvoke is called
    *
    */
    public boolean useLocalInvocation( org.omg.CORBA.Object self )
    {
        if (isNextCallValid.get() == Boolean.TRUE)
            return servantIsLocal ;
        else
            isNextCallValid.set( Boolean.TRUE ) ;

        return false ;
    }

    /** Check that the servant in info (which must not be null) is
    * an instance of the expectedType.  If not, set the thread local flag
    * and return false.
    */
    protected boolean checkForCompatibleServant( ServantObject so,
        Class expectedType )
    {
        if (so == null)
            return false ;

        // Normally, this test will never fail.  However, if the servant
        // and the stub were loaded in different class loaders, this test
        // will fail.
        if (!expectedType.isInstance( so.servant )) {
            isNextCallValid.set( Boolean.FALSE ) ;

            // When servant_preinvoke returns null, the stub will
            // recursively re-invoke itself.  Thus, the next call made from
            // the stub is another useLocalInvocation call.
            return false ;
        }

        return true ;
    }

}

// End of file.