peergroupinterface.java

jxta_src_2.41b jxta 2.41b 最新版源码 from www.jxta.org

/*
 * Copyright (c) 2002 Sun Microsystems, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *       Sun Microsystems, Inc. for Project JXTA."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" 
 *    must not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact Project JXTA at http://www.jxta.org.
 *
 * 5. Products derived from this software may not be called "JXTA",
 *    nor may "JXTA" appear in their name, without prior written
 *    permission of Sun.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL SUN MICROSYSTEMS OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Project JXTA.  For more
 * information on Project JXTA, please see
 * <http://www.jxta.org/>.
 *
 * This license is based on the BSD license adopted by the Apache Foundation.
 *
 * $Id: PeerGroupInterface.java,v 1.15 2006/02/22 01:29:43 bondolo Exp $
 */

package net.jxta.impl.peergroup;

import java.net.URI;
import java.util.Iterator;

import java.io.IOException;

import org.apache.log4j.Level;
import org.apache.log4j.Logger;

import net.jxta.access.AccessService;
import net.jxta.discovery.DiscoveryService;
import net.jxta.document.Advertisement;
import net.jxta.document.Element;
import net.jxta.endpoint.EndpointService;
import net.jxta.id.ID;
import net.jxta.membership.MembershipService;
import net.jxta.peer.PeerID;
import net.jxta.peer.PeerInfoService;
import net.jxta.peergroup.PeerGroup;
import net.jxta.peergroup.PeerGroupID;
import net.jxta.pipe.PipeService;
import net.jxta.platform.JxtaLoader;
import net.jxta.platform.Module;
import net.jxta.platform.ModuleSpecID;
import net.jxta.protocol.ConfigParams;
import net.jxta.protocol.ModuleImplAdvertisement;
import net.jxta.protocol.PeerAdvertisement;
import net.jxta.protocol.PeerGroupAdvertisement;
import net.jxta.rendezvous.RendezVousService;
import net.jxta.resolver.ResolverService;
import net.jxta.service.Service;

import net.jxta.exception.PeerGroupException;
import net.jxta.exception.ProtocolNotSupportedException;
import net.jxta.exception.ServiceNotFoundException;

/**
 * PeerGroupInterface provides a pure interface object that permits interaction
 * with the actual PeerGroup implementation without giving access to the real 
 * object.
 *
 * <p/>This class defines immutable objects. It has no control over the wrapped
 * peer group object's life cycle. It serves to make weak PeerGroup interface
 * object.
 **/
class PeerGroupInterface implements PeerGroup {

    /**
     *  Log4J Logger
     **/
    private static final Logger LOG = Logger.getLogger(PeerGroupInterface.class.getName());
    
    /**
     *  The peer group instance which backs this interface object.
     **/
    protected PeerGroup groupImpl;

    /**
     * Constructs an interface object that front-ends a given GenericPeerGroup.
     */
    PeerGroupInterface(PeerGroup theRealThing) {
        groupImpl = theRealThing;
    }

    /**
     *  {@inheritDoc}
     **/
    public boolean equals(Object target) {
        PeerGroup temp = groupImpl;
        
        if( null != temp ) {
            return temp.equals(target);
        } else {
            return super.equals(target);
        }
    }

    /**
     *  {@inheritDoc}
     *  
     *  <p/>An implementation suitable for debugging. <b>Don't try to parse 
     *  this string!</b> All of the information is available from other sources.
     **/
    public String toString() {
        PeerGroup temp = groupImpl;
        
        if( null != temp ) {
            return temp.toString();
        } else {
            return super.toString();
        }
    }
    
    /**
     * {@inheritDoc}
     *
     * <p/>This is here for class hierarchy reasons. It is normaly ignored. By 
     * definition, the interface object protects the real object's start/stop 
     * methods from being called.
     */

    public void init(PeerGroup pg, ID assignedID, Advertisement impl) {
    }

    /**
     * {@inheritDoc}
     *
     * <p/>This is here for class hierarchy reasons. It is normaly ignored. By 
     * definition, the interface object protects the real object's start/stop 
     * methods from being called.
     */
    public int startApp(String[] arg) {
        return 0;
    }

    /**
     * {@inheritDoc}
     *
     * <p/>This is here for class hierarchy reasons. It is normaly ignored. By 
     * definition, the interface object protects the real object's start/stop 
     * methods from being called.
     */
    public void stopApp() {
    }

    /**
     * {@inheritDoc}
     **/
    public Service getInterface() {
        return this;
    }

    /**
     * {@inheritDoc}
     **/
    public PeerGroup getWeakInterface() {
        return this;
    }

    /**
     * {@inheritDoc}
     *      
     * <p/>Does nothing.
     **/
    public void unref() {
    }

    /**
     * {@inheritDoc}
     **/
    public Advertisement getImplAdvertisement() {
        return groupImpl.getImplAdvertisement();
    }

    /**
     * {@inheritDoc}
     **/
    public ThreadGroup getHomeThreadGroup() {
        return groupImpl.getHomeThreadGroup();
    }

    /**
     * {@inheritDoc}
     **/
    public URI getStoreHome() {
        return groupImpl.getStoreHome();
    }

    /**
     * {@inheritDoc}
     **/
    public JxtaLoader getLoader() {
        return groupImpl.getLoader();
    }
  
    /**
     * {@inheritDoc}
     **/
    public boolean isRendezvous() {
        return groupImpl.isRendezvous();
    }
  
    /**
     * {@inheritDoc}
     **/
    public PeerGroupAdvertisement getPeerGroupAdvertisement() {
        return groupImpl.getPeerGroupAdvertisement();
    }

    /**
     * {@inheritDoc}
     **/
    public PeerAdvertisement getPeerAdvertisement() {
        return groupImpl.getPeerAdvertisement();
    }
    
    /**
     * {@inheritDoc}
     **/
    public Service lookupService(ID name) throws ServiceNotFoundException {
	return groupImpl.lookupService(name);
    }

    /**
     * {@inheritDoc}
     **/
    public Service lookupService(ID name, int roleIndex) throws ServiceNotFoundException {
	return groupImpl.lookupService(name, roleIndex);
    }

    /**
     * {@inheritDoc}
     **/
    public Iterator getRoleMap(ID name) {
	return groupImpl.getRoleMap(name);
    }

    /**
     * {@inheritDoc}
     **/
    public boolean compatible(Element compat) {
	return groupImpl.compatible(compat);
    }

    /**
     * {@inheritDoc}
     *
     * FIXME 20031103 jice Ideally, we'd need the groupAPI to offer a means to 
     * loadModule() without making a counted reference, so that group services 
     * can loadModule() things without preventing group termination. This could 
     * be achieved elegantly by making this the only behaviour available through 
     * a weak GroupInterface. So it would be enough to obtain a weak interface 
     * from one's group and then use its loadmodule method rather than that of
     * the strong group reference.  However, that's a bit too big a change to be 
     * decided without more careful consideration.
     **/
    public Module loadModule(ID assignedID, Advertisement impl)
        throws ProtocolNotSupportedException, PeerGroupException {
        return groupImpl.loadModule(assignedID, impl);
    }

    /**
     * {@inheritDoc}
     **/
    public Module loadModule(ID assignedID, ModuleSpecID specID, int where) {
        return groupImpl.loadModule(assignedID, specID, where);
    }

    /**
     * {@inheritDoc}
     **/
    public void publishGroup(String name, String description)
        throws IOException {
        groupImpl.publishGroup(name, description);
    }


    /*
     * Valuable application helpers: Various methods to instantiate groups.
     */

    /**
     * {@inheritDoc}
     */
    public PeerGroup newGroup(Advertisement pgAdv)
        throws PeerGroupException {
        return groupImpl.newGroup(pgAdv);
    }

    /**
     * {@inheritDoc}
     */
    public PeerGroup newGroup(PeerGroupID gid, Advertisement impl,
                              String name, String description)
        throws PeerGroupException {
        return groupImpl.newGroup(gid, impl, name, description);
    }

    /**
     * {@inheritDoc}
     */
    public PeerGroup newGroup(PeerGroupID gid)
        throws PeerGroupException {
        return groupImpl.newGroup(gid);
    }


    /*
     * shortcuts to the well-known services, in order to avoid calls to lookup.
     */

    /**
     * {@inheritDoc}
     **/
    public RendezVousService getRendezVousService() {
        return groupImpl.getRendezVousService();
    }

    /**
     * {@inheritDoc}
     **/
    public EndpointService getEndpointService() {
        return groupImpl.getEndpointService();
    }

    /**
     * {@inheritDoc}
     **/
    public ResolverService getResolverService() {
        return groupImpl.getResolverService();
    }

    /**
     * {@inheritDoc}
     **/
    public DiscoveryService getDiscoveryService() {
        return groupImpl.getDiscoveryService();
    }

    /**
     * {@inheritDoc}
     **/
    public PeerInfoService getPeerInfoService() {
        return groupImpl.getPeerInfoService();
    }

    /**
     * {@inheritDoc}
     **/
    public MembershipService getMembershipService() {
        return groupImpl.getMembershipService();
    }

    /**
     * {@inheritDoc}
     **/
    public PipeService getPipeService() {
        return groupImpl.getPipeService();
    }

    /**
     * {@inheritDoc}
     **/
    public AccessService getAccessService() {
        return groupImpl.getAccessService();
    }
    
    
    
    /*
     * A few convenience methods. This information is available from
     * the peer and peergroup advertisement.
     */

    /**
     * {@inheritDoc}
     **/
    public PeerGroupID getPeerGroupID() {
        return groupImpl.getPeerGroupID();
    }
    
    /**
     * {@inheritDoc}
     **/
    public PeerID getPeerID() {
        return groupImpl.getPeerID();
    }
    
    /**
     * {@inheritDoc}
     **/
    public String getPeerGroupName() {
        return groupImpl.getPeerGroupName();
    }

    /**
     * {@inheritDoc}
     **/
    public String getPeerName() {
        return groupImpl.getPeerName();
    }

    /**
     * {@inheritDoc}
     **/
    public ConfigParams getConfigAdvertisement() {
        ConfigParams configAdvertisement = groupImpl.getConfigAdvertisement();
        
        // FIXME: [[e-mail] 20011022] Clone it for now. It would be way
        // better if we had an immutable version to give away.
        if (configAdvertisement == null) {
            return null;
        }
        
        try {
        
            return (ConfigParams) configAdvertisement.clone();
        } catch ( CloneNotSupportedException failed ) {
            if (LOG.isEnabledFor(Level.ERROR)) {
                LOG.error( "Couldnt clone config advertisement" );
            }
            return null;
        }
    }

    /**
     * {@inheritDoc}
     **/
    public ModuleImplAdvertisement getAllPurposePeerGroupImplAdvertisement()
        throws Exception {
        return groupImpl.getAllPurposePeerGroupImplAdvertisement();
    }

   public PeerGroup getParentGroup() {
       return groupImpl.getParentGroup();
   } 
}