discoveryserviceinterface.java

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

/*
 *  Copyright (c) 2001 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,
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 *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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 *  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: DiscoveryServiceInterface.java,v 1.19 2005/11/07 17:42:55 hamada Exp $
 */
package net.jxta.impl.discovery;

import java.util.Enumeration;
import java.io.IOException;

import net.jxta.discovery.DiscoveryListener;
import net.jxta.discovery.DiscoveryService;
import net.jxta.document.Advertisement;
import net.jxta.id.ID;
import net.jxta.peergroup.PeerGroup;
import net.jxta.service.Service;

/**
 * Provides a pure interface object that permits interaction with the actual
 * Discovery Service implementation without giving access to the real object.
 */
public final class DiscoveryServiceInterface implements DiscoveryService {

    private DiscoveryServiceImpl impl;

    /**
     * Only authorized constructor
     *
     * @param  theRealThing  The actual discovery implementation
     */
    protected DiscoveryServiceInterface(DiscoveryServiceImpl theRealThing) {
        impl = theRealThing;
    }

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

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

    /**
     *  {@inheritDoc}
     *
     * <p/>FIXME: This is meaningless for the interface object;
     * it is there only to satisfy the requirements of the
     * interface that we implement. Ultimately, the API should define
     * two levels of interfaces: one for the real service implementation
     * and one for the interface object. Right now it feels a bit heavy
     * to so that since the only different between the two would be
     * init() and may-be getName().
     */  
    public void init(PeerGroup pg, ID assignedID, Advertisement impl) {}
    
    /**
     *  {@inheritDoc}
     *
     * <p/>This is here for temporary class hierarchy reasons.
     * it is ALWAYS 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 temporary class hierarchy reasons.
     * it is ALWAYS ignored. By definition, the interface object
     * protects the real object's start/stop methods from being called
     *
     * <p/>This request is currently ignored.
     */
    public void stopApp() {}

    /**
     *  {@inheritDoc}
     */
    public int getRemoteAdvertisements(String peer,
                                       int type,
                                       String attribute,
                                       String value,
                                       int threshold) {

        return impl.getRemoteAdvertisements(peer, type, attribute, value, threshold);
    }

    /**
     *  {@inheritDoc}
     */
    public int getRemoteAdvertisements(String peer,
            int type,
            String attribute,
            String value,
            int threshold,
            DiscoveryListener listener) {
        return impl.getRemoteAdvertisements(peer, type, attribute, value, threshold, listener);
    }

    /**
     *  {@inheritDoc}
     */
    public Enumeration getLocalAdvertisements(int type,
                                              String attribute,
                                              String value) throws IOException {
        return impl.getLocalAdvertisements(type, attribute, value);
    }

    /**
     *  {@inheritDoc}
     */
    public void flushAdvertisement(Advertisement adv)
        throws IOException {

        impl.flushAdvertisement(adv);
    }

    /**
     *  {@inheritDoc}
     */
    public void flushAdvertisements(String id, int type) throws IOException {
        impl.flushAdvertisements(id, type);
    }

    /**
     *  {@inheritDoc}
     */
    public long getAdvExpirationTime(ID id, int type) {
        return impl.getAdvExpirationTime(id, type);
    }

    /**
     *  {@inheritDoc}
     */
    public long getAdvLifeTime(ID id, int type) {
        return impl.getAdvLifeTime(id, type);
    }

    /**
     *  {@inheritDoc}
     */
    public long getAdvExpirationTime(Advertisement adv) {
        return impl.getAdvExpirationTime(adv);
    }

    /**
     *  {@inheritDoc}
     */
    public long getAdvLifeTime(Advertisement adv) {
        return impl.getAdvLifeTime(adv);
    }

    /**
     *  {@inheritDoc}
     */
    public void publish(Advertisement adv) throws IOException {
        impl.publish(adv);
    }

    /**
     *  {@inheritDoc}
     */
    public void publish(Advertisement adv,
                        long lifetime,
                        long expiration) throws IOException {

        impl.publish(adv, lifetime, expiration);
    }

    /**
     *  {@inheritDoc}
     */
    public void remotePublish(Advertisement adv) {
        impl.remotePublish(adv);
    }
    
    /**
     *  {@inheritDoc}
     */
    public void remotePublish(Advertisement adv, long expiration) {
        impl.remotePublish(adv, expiration);
    }

    /**
     *  {@inheritDoc}
     */
    public void remotePublish(String peerid, Advertisement adv) {
        impl.remotePublish(peerid, adv);
    }

    /**
     *  {@inheritDoc}
     */
    public void remotePublish(String peerid, Advertisement adv, long expiration) {
        impl.remotePublish(peerid, adv, expiration);
    }

    /**
     *  {@inheritDoc}
     */
    public synchronized void addDiscoveryListener(DiscoveryListener listener) {
        impl.addDiscoveryListener(listener);
    }

    /**
     *  {@inheritDoc}
     */
    public synchronized boolean removeDiscoveryListener(DiscoveryListener listener) {
        return (impl.removeDiscoveryListener(listener));
    }
}