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   1 /**
   2  * Copyright (c) 2010-2021 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.darksky.internal.discovery;
  14
  15 import static org.openhab.binding.darksky.internal.DarkSkyBindingConstants.*;
  16
  17 import java.util.Date;
  18 import java.util.Map;
  19 import java.util.Objects;
  20 import java.util.concurrent.ScheduledFuture;
  21 import java.util.concurrent.TimeUnit;
  22
  23 import org.eclipse.jdt.annotation.NonNullByDefault;
  24 import org.eclipse.jdt.annotation.Nullable;
  25 import org.openhab.binding.darksky.internal.handler.DarkSkyAPIHandler;
  26 import org.openhab.binding.darksky.internal.handler.DarkSkyWeatherAndForecastHandler;
  27 import org.openhab.core.config.discovery.AbstractDiscoveryService;
  28 import org.openhab.core.config.discovery.DiscoveryResultBuilder;
  29 import org.openhab.core.i18n.LocaleProvider;
  30 import org.openhab.core.i18n.LocationProvider;
  31 import org.openhab.core.i18n.TranslationProvider;
  32 import org.openhab.core.library.types.PointType;
  33 import org.openhab.core.thing.ThingUID;
  34 import org.slf4j.Logger;
  35 import org.slf4j.LoggerFactory;
  36
  37 /**
  38  * The {@link DarkSkyDiscoveryService} creates things based on the configured location.
  39  *
  40  * @author Christoph Weitkamp - Initial Contribution
  41  */
  42 @NonNullByDefault
  43 public class DarkSkyDiscoveryService extends AbstractDiscoveryService {
  44
  45     private final Logger logger = LoggerFactory.getLogger(DarkSkyDiscoveryService.class);
  46
  47     private static final int DISCOVERY_TIMEOUT_SECONDS = 2;
  48     private static final int DISCOVERY_INTERVAL_SECONDS = 60;
  49     private @Nullable ScheduledFuture<?> discoveryJob;
  50     private final LocationProvider locationProvider;
  51     private @Nullable PointType previousLocation;
  52
  53     private final DarkSkyAPIHandler bridgeHandler;
  54
  55     /**
  56      * Creates an DarkSkyLocationDiscoveryService.
  57      */
  58     public DarkSkyDiscoveryService(DarkSkyAPIHandler bridgeHandler, LocationProvider locationProvider,
  59             LocaleProvider localeProvider, TranslationProvider i18nProvider) {
  60         super(DarkSkyWeatherAndForecastHandler.SUPPORTED_THING_TYPES, DISCOVERY_TIMEOUT_SECONDS);
  61         this.bridgeHandler = bridgeHandler;
  62         this.locationProvider = locationProvider;
  63         this.localeProvider = localeProvider;
  64         this.i18nProvider = i18nProvider;
  65         activate(null);
  66     }
  67
  68     @Override
  69     protected void activate(@Nullable Map<String, Object> configProperties) {
  70         super.activate(configProperties);
  71     }
  72
  73     @Override
  74     public void deactivate() {
  75         removeOlderResults(new Date().getTime(), bridgeHandler.getThing().getUID());
  76         super.deactivate();
  77     }
  78
  79     @Override
  80     protected void startScan() {
  81         logger.debug("Start manual Dark Sky Location discovery scan.");
  82         scanForNewLocation();
  83     }
  84
  85     @Override
  86     protected synchronized void stopScan() {
  87         logger.debug("Stop manual Dark Sky Location discovery scan.");
  88         super.stopScan();
  89     }
  90
  91     @Override
  92     protected void startBackgroundDiscovery() {
  93         if (discoveryJob == null || discoveryJob.isCancelled()) {
  94             logger.debug("Start Dark Sky Location background discovery job at interval {} s.",
  95                     DISCOVERY_INTERVAL_SECONDS);
  96             discoveryJob = scheduler.scheduleWithFixedDelay(this::scanForNewLocation, 0, DISCOVERY_INTERVAL_SECONDS,
  97                     TimeUnit.SECONDS);
  98         }
  99     }
 100
 101     @Override
 102     protected void stopBackgroundDiscovery() {
 103         if (discoveryJob != null && !discoveryJob.isCancelled()) {
 104             logger.debug("Stop Dark Sky Location background discovery job.");
 105             if (discoveryJob.cancel(true)) {
 106                 discoveryJob = null;
 107             }
 108         }
 109     }
 110
 111     private void scanForNewLocation() {
 112         PointType currentLocation = locationProvider.getLocation();
 113         if (currentLocation == null) {
 114             logger.debug("Location is not set -> Will not provide any discovery results.");
 115         } else if (!Objects.equals(currentLocation, previousLocation)) {
 116             logger.debug("Location has been changed from {} to {} -> Creating new discovery results.", previousLocation,
 117                     currentLocation);
 118             createResults(currentLocation);
 119             previousLocation = currentLocation;
 120         } else {
 121             createResults(currentLocation);
 122         }
 123     }
 124
 125     private void createResults(PointType location) {
 126         String locationString = location.toFullString();
 127         ThingUID bridgeUID = bridgeHandler.getThing().getUID();
 128         createWeatherAndForecastResult(locationString, bridgeUID);
 129     }
 130
 131     private void createWeatherAndForecastResult(String location, ThingUID bridgeUID) {
 132         thingDiscovered(DiscoveryResultBuilder.create(new ThingUID(THING_TYPE_WEATHER_AND_FORECAST, bridgeUID, LOCAL))
 133                 .withLabel("Local weather and forecast").withProperty(CONFIG_LOCATION, location)
 134                 .withRepresentationProperty(CONFIG_LOCATION).withBridge(bridgeUID).build());
 135     }
 136 }