org.openhab.io.servicediscovery.internal.DiscoveryServiceImpl.java Source code

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Here is the source code for org.openhab.io.servicediscovery.internal.DiscoveryServiceImpl.java

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/**
 * Copyright (c) 2010-2015, openHAB.org and others.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package org.openhab.io.servicediscovery.internal;

import java.io.IOException;
import java.net.InetAddress;
import java.util.Dictionary;

import javax.jmdns.JmDNS;
import javax.jmdns.ServiceInfo;

import org.apache.commons.lang.StringUtils;
import org.openhab.io.servicediscovery.DiscoveryService;
import org.openhab.io.servicediscovery.ServiceDescription;
import org.osgi.service.cm.ManagedService;
import org.osgi.service.cm.ConfigurationException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * This class starts the JmDNS and implements interface to register and unregister services.
 * 
 * @author Victor Belov
 * @since 1.0.0
 *
 */
public class DiscoveryServiceImpl implements DiscoveryService, ManagedService {

    private static Logger logger = LoggerFactory.getLogger(DiscoveryServiceImpl.class);
    private JmDNS jmdns;

    public DiscoveryServiceImpl() {
    }

    @Override
    public void updated(Dictionary<String, ?> config) throws ConfigurationException {
        try {
            if (config != null) {
                String bindAddress = (String) config.get("bind_address");
                if (bindAddress != null && StringUtils.isNotBlank(bindAddress)) {
                    jmdns = JmDNS.create(InetAddress.getByName(bindAddress));
                    logger.info("Service Discovery initialization completed (bound to address: {}).", bindAddress);
                    return;
                }
            }
            jmdns = JmDNS.create();
            logger.info("Service Discovery initialization completed.");
        } catch (IOException e) {
            logger.error(e.getMessage());
        }
    }

    /**
     * @{inheritDoc}
     */
    public void registerService(ServiceDescription description) {
        ServiceInfo serviceInfo = ServiceInfo.create(description.serviceType, description.serviceName,
                description.servicePort, 0, 0, description.serviceProperties);
        try {
            logger.debug("Registering new service " + description.serviceType + " at port "
                    + String.valueOf(description.servicePort));
            jmdns.registerService(serviceInfo);
        } catch (IOException e) {
            logger.error(e.getMessage());
        }
    }

    /**
     * @{inheritDoc}
     */
    public void unregisterService(ServiceDescription description) {
        ServiceInfo serviceInfo = ServiceInfo.create(description.serviceType, description.serviceName,
                description.servicePort, 0, 0, description.serviceProperties);
        logger.debug("Unregistering service " + description.serviceType + " at port "
                + String.valueOf(description.servicePort));
        jmdns.unregisterService(serviceInfo);
    }

    /**
     * This method unregisters all services from Bonjour/MDNS
     */
    protected void unregisterAllServices() {
        jmdns.unregisterAllServices();
    }

    public void activate() {
        logger.info("mDNS service has been started");
    }

    public void deactivate() {
        unregisterAllServices();
        try {
            jmdns.close();
            logger.info("mDNS service has been stopped");
        } catch (IOException e) {
            logger.error(e.getMessage());
        }
    }

}