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Java example source code file (CorbaContactInfoListIteratorImpl.java)

This example Java source code file (CorbaContactInfoListIteratorImpl.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

comm_failure, contactinfo, corba, corbacontactinfo, corbacontactinfolistiteratorimpl, iiopprimarytocontactinfo, ior, list, object, runtimeexception, systemexception, unsupportedoperationexception, util

The CorbaContactInfoListIteratorImpl.java Java example source code

/*
 * Copyright (c) 2002, 2004, 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.transport;

import java.util.Iterator;
import java.util.List;

import org.omg.CORBA.COMM_FAILURE;
import org.omg.CORBA.CompletionStatus;
import org.omg.CORBA.INTERNAL;
import org.omg.CORBA.SystemException;

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

import com.sun.corba.se.spi.ior.IOR ;
import com.sun.corba.se.spi.logging.CORBALogDomains;
import com.sun.corba.se.spi.orb.ORB ;
import com.sun.corba.se.spi.transport.CorbaContactInfo;
import com.sun.corba.se.spi.transport.CorbaContactInfoList;
import com.sun.corba.se.spi.transport.CorbaContactInfoListIterator;
import com.sun.corba.se.spi.transport.IIOPPrimaryToContactInfo;

import com.sun.corba.se.impl.logging.ORBUtilSystemException;
import com.sun.corba.se.impl.protocol.CorbaInvocationInfo;

// REVISIT: create a unit test for this class.

public class CorbaContactInfoListIteratorImpl
    implements
        CorbaContactInfoListIterator
{
    protected ORB orb;
    protected CorbaContactInfoList contactInfoList;
    protected CorbaContactInfo successContactInfo;
    protected CorbaContactInfo failureContactInfo;
    protected RuntimeException failureException;

    // ITERATOR state
    protected Iterator effectiveTargetIORIterator;
    protected CorbaContactInfo previousContactInfo;
    protected boolean isAddrDispositionRetry;
    protected IIOPPrimaryToContactInfo primaryToContactInfo;
    protected ContactInfo primaryContactInfo;
    protected List listOfContactInfos;
    // End ITERATOR state

    public CorbaContactInfoListIteratorImpl(
        ORB orb,
        CorbaContactInfoList corbaContactInfoList,
        ContactInfo primaryContactInfo,
        List listOfContactInfos)
    {
        this.orb = orb;
        this.contactInfoList = corbaContactInfoList;
        this.primaryContactInfo = primaryContactInfo;
        if (listOfContactInfos != null) {
            // listOfContactInfos is null when used by the legacy
            // socket factory.  In that case this iterator is NOT used.
            this.effectiveTargetIORIterator = listOfContactInfos.iterator();
        }
        // List is immutable so no need to synchronize access.
        this.listOfContactInfos = listOfContactInfos;

        this.previousContactInfo = null;
        this.isAddrDispositionRetry = false;

        this.successContactInfo = null;
        this.failureContactInfo = null;
        this.failureException = null;

        primaryToContactInfo = orb.getORBData().getIIOPPrimaryToContactInfo();
    }

    ////////////////////////////////////////////////////
    //
    // java.util.Iterator
    //

    public boolean hasNext()
    {
        // REVISIT: Implement as internal closure iterator which would
        // wraps sticky or default.  Then hasNext and next just call
        // the closure.

        if (isAddrDispositionRetry) {
            return true;
        }

        boolean result;

        if (primaryToContactInfo != null) {
            result = primaryToContactInfo.hasNext(primaryContactInfo,
                                                  previousContactInfo,
                                                  listOfContactInfos);
        } else {
            result = effectiveTargetIORIterator.hasNext();
        }

        return result;
    }

    public Object next()
    {
        if (isAddrDispositionRetry) {
            isAddrDispositionRetry = false;
            return previousContactInfo;
        }

        // We hold onto the last in case we get an addressing
        // disposition retry.  Then we use it again.

        // We also hold onto it for the sticky manager.

        if (primaryToContactInfo != null) {
            previousContactInfo = (CorbaContactInfo)
                primaryToContactInfo.next(primaryContactInfo,
                                          previousContactInfo,
                                          listOfContactInfos);
        } else {
            previousContactInfo = (CorbaContactInfo)
                effectiveTargetIORIterator.next();
        }

        return previousContactInfo;
    }

    public void remove()
    {
        throw new UnsupportedOperationException();
    }

    ////////////////////////////////////////////////////
    //
    // com.sun.corba.se.pept.transport.ContactInfoListIterator
    //

    public ContactInfoList getContactInfoList()
    {
        return contactInfoList;
    }

    public void reportSuccess(ContactInfo contactInfo)
    {
        this.successContactInfo = (CorbaContactInfo)contactInfo;
    }

    public boolean reportException(ContactInfo contactInfo,
                                   RuntimeException ex)
    {
        this.failureContactInfo = (CorbaContactInfo)contactInfo;
        this.failureException = ex;
        if (ex instanceof COMM_FAILURE) {
            SystemException se = (SystemException) ex;
            if (se.completed == CompletionStatus.COMPLETED_NO) {
                if (hasNext()) {
                    return true;
                }
                if (contactInfoList.getEffectiveTargetIOR() !=
                    contactInfoList.getTargetIOR())
                {
                    // retry from root ior
                    updateEffectiveTargetIOR(contactInfoList.getTargetIOR());
                    return true;
                }
            }
        }
        return false;
    }

    public RuntimeException getFailureException()
    {
        if (failureException == null) {
            return
                ORBUtilSystemException.get( orb,
                                            CORBALogDomains.RPC_TRANSPORT )
                    .invalidContactInfoListIteratorFailureException();
        } else {
            return failureException;
        }
    }

    ////////////////////////////////////////////////////
    //
    // spi.CorbaContactInfoListIterator
    //

    public void reportAddrDispositionRetry(CorbaContactInfo contactInfo,
                                           short disposition)
    {
        previousContactInfo.setAddressingDisposition(disposition);
        isAddrDispositionRetry = true;
    }

    public void reportRedirect(CorbaContactInfo contactInfo,
                               IOR forwardedIOR)
    {
        updateEffectiveTargetIOR(forwardedIOR);
    }

    ////////////////////////////////////////////////////
    //
    // Implementation.
    //

    //
    // REVISIT:
    //
    // The normal operation for a standard iterator is to throw
    // ConcurrentModificationException whenever the underlying collection
    // changes.  This is implemented by keeping a modification counter (the
    // timestamp may fail because the granularity is too coarse).
    // Essentially what you need to do is whenever the iterator fails this
    // way, go back to ContactInfoList and get a new iterator.
    //
    // Need to update CorbaClientRequestDispatchImpl to catch and use
    // that exception.
    //

    public void updateEffectiveTargetIOR(IOR newIOR)
    {
        contactInfoList.setEffectiveTargetIOR(newIOR);
        // If we report the exception in _request (i.e., beginRequest
        // we cannot throw RemarshalException to the stub because _request
        // does not declare that exception.
        // To keep the two-level dispatching (first level chooses ContactInfo,
        // second level is specific to that ContactInfo/EPT) we need to
        // ensure that the request dispatchers get their iterator from the
        // InvocationStack (i.e., ThreadLocal). That way if the list iterator
        // needs a complete update it happens right here.
        ((CorbaInvocationInfo)orb.getInvocationInfo())
            .setContactInfoListIterator(contactInfoList.iterator());
    }
}

// End of file.

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