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   1 /**
   2  * Copyright (c) 2010-2020 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.sagercaster.internal.discovery;
  14
  15 import static org.openhab.binding.sagercaster.internal.SagerCasterBindingConstants.*;
  16
  17 import java.util.Arrays;
  18 import java.util.HashSet;
  19 import java.util.Map;
  20 import java.util.Objects;
  21 import java.util.concurrent.ScheduledFuture;
  22 import java.util.concurrent.TimeUnit;
  23
  24 import org.eclipse.jdt.annotation.NonNullByDefault;
  25 import org.eclipse.jdt.annotation.Nullable;
  26 import org.openhab.core.config.discovery.AbstractDiscoveryService;
  27 import org.openhab.core.config.discovery.DiscoveryResultBuilder;
  28 import org.openhab.core.config.discovery.DiscoveryService;
  29 import org.openhab.core.i18n.LocationProvider;
  30 import org.openhab.core.library.types.PointType;
  31 import org.openhab.core.thing.ThingTypeUID;
  32 import org.openhab.core.thing.ThingUID;
  33 import org.osgi.service.component.annotations.Component;
  34 import org.osgi.service.component.annotations.Reference;
  35 import org.slf4j.Logger;
  36 import org.slf4j.LoggerFactory;
  37
  38 /**
  39  * The {@link SagerCasterDiscoveryService} creates things based on the configured location.
  40  *
  41  * @author Gaël L'hopital - Initial Contribution
  42  */
  43 @NonNullByDefault
  44 @Component(service = DiscoveryService.class, configurationPid = "discovery.sagercaster")
  45 public class SagerCasterDiscoveryService extends AbstractDiscoveryService {
  46     private final Logger logger = LoggerFactory.getLogger(SagerCasterDiscoveryService.class);
  47     private static final int DISCOVER_TIMEOUT_SECONDS = 30;
  48     private static final int LOCATION_CHANGED_CHECK_INTERVAL = 60;
  49     private @NonNullByDefault({}) LocationProvider locationProvider;
  50     private @NonNullByDefault({}) ScheduledFuture<?> sagerCasterDiscoveryJob;
  51     private @Nullable PointType previousLocation;
  52
  53     private static final ThingUID sagerCasterThing = new ThingUID(THING_TYPE_SAGERCASTER, LOCAL);
  54
  55     /**
  56      * Creates a SagerCasterDiscoveryService with enabled autostart.
  57      */
  58     public SagerCasterDiscoveryService() {
  59         super(new HashSet<>(Arrays.asList(new ThingTypeUID(BINDING_ID, "-"))), DISCOVER_TIMEOUT_SECONDS, true);
  60     }
  61
  62     @Override
  63     protected void activate(@Nullable Map<String, @Nullable Object> configProperties) {
  64         super.activate(configProperties);
  65     }
  66
  67     @Override
  68     protected void modified(@Nullable Map<String, @Nullable Object> configProperties) {
  69         super.modified(configProperties);
  70     }
  71
  72     @Override
  73     protected void startScan() {
  74         logger.debug("Starting Sager Weathercaster discovery scan");
  75         PointType location = locationProvider.getLocation();
  76         if (location == null) {
  77             logger.debug("LocationProvider.getLocation() is not set -> Will not provide any discovery results");
  78             return;
  79         }
  80         createResults(location);
  81     }
  82
  83     @Override
  84     protected void startBackgroundDiscovery() {
  85         if (sagerCasterDiscoveryJob == null) {
  86             sagerCasterDiscoveryJob = scheduler.scheduleWithFixedDelay(() -> {
  87                 PointType currentLocation = locationProvider.getLocation();
  88                 if (currentLocation != null && !Objects.equals(currentLocation, previousLocation)) {
  89                     logger.debug("Location has been changed from {} to {}: Creating new discovery results",
  90                             previousLocation, currentLocation);
  91                     createResults(currentLocation);
  92                     previousLocation = currentLocation;
  93                 }
  94             }, 0, LOCATION_CHANGED_CHECK_INTERVAL, TimeUnit.SECONDS);
  95             logger.debug("Scheduled SagerCaster location-changed job every {} seconds",
  96                     LOCATION_CHANGED_CHECK_INTERVAL);
  97         }
  98     }
  99
 100     @Override
 101     protected void stopBackgroundDiscovery() {
 102         logger.debug("Stopping Sager Weathercaster background discovery");
 103         if (sagerCasterDiscoveryJob != null && !sagerCasterDiscoveryJob.isCancelled()) {
 104             if (sagerCasterDiscoveryJob.cancel(true)) {
 105                 sagerCasterDiscoveryJob = null;
 106                 logger.debug("Stopped SagerCaster device background discovery");
 107             }
 108         }
 109     }
 110
 111     public void createResults(PointType location) {
 112         String propGeolocation;
 113         propGeolocation = String.format("%s,%s", location.getLatitude(), location.getLongitude());
 114         thingDiscovered(DiscoveryResultBuilder.create(sagerCasterThing).withLabel("Local Sager Weathercaster")
 115                 .withRepresentationProperty(CONFIG_LOCATION).withProperty(CONFIG_LOCATION, propGeolocation).build());
 116     }
 117
 118     @Reference
 119     protected void setLocationProvider(LocationProvider locationProvider) {
 120         this.locationProvider = locationProvider;
 121     }
 122
 123     protected void unsetLocationProvider(LocationProvider locationProvider) {
 124         this.locationProvider = null;
 125     }
 126 }