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The addc-slp library supplies client classes for registering objects with a Service Location Protocol Daemon and for looking theses objects up later.

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package com.addc.commons.slp;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.apache.commons.lang.StringUtils;

import com.addc.commons.Mutex;
import com.addc.commons.slp.configuration.SLPConfig;

/**
 * Implementation of the SLP ServiceLocationManager class defined in RFC 2614.
 */
public class ServiceLocationManager {
    private final SLPConfig config;
    private final NetworkManager netManager;
    private final Mutex mutex= new Mutex();
    private final List scopes= new ArrayList<>();
    private Locator locator;
    private Advertiser advertiser;

    /**
     * Returns the number of seconds since Jan 1, 1970
     * 
     * @return the number of seconds since Jan 1, 1970
     */
    public static int getTimestamp() {
        long systemTime= System.currentTimeMillis();
        return (int) (systemTime / 1000);
    }

    /**
     * Create a new ServiceLocationManager
     * 
     * @param config
     *            The configuration to use
     * @param netManager
     *            The network manager to use
     */
    public ServiceLocationManager(SLPConfig config, NetworkManager netManager) {
        this.config= config;
        this.netManager= netManager;
        scopes.addAll(Arrays.asList(StringUtils.split(config.getScopes(), ',')));
    }

    /**
     * Get a locator.
     * 
     * @return a locator.
     */
    public Locator getLocator() {
        synchronized (mutex) {
            if (locator == null) {
                locator= new LocatorImpl(config, netManager);
            }
        }
        return locator;
    }

    /**
     * Get an Advertizer.
     * 
     * @return an Advertizer.
     */
    public Advertiser getAdvertiser() {
        synchronized (mutex) {
            if (advertiser == null) {
                advertiser= new AdvertiserImpl(config, netManager);
            }
        }
        return advertiser;
    }

    /**
     * Get the config
     * 
     * @return the config
     */
    public SLPConfig getConfig() {
        return config;
    }

    /**
     * Get the netManager
     * 
     * @return the netManager
     */
    public NetworkManager getNetManager() {
        return netManager;
    }

}