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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.airquality.internal.discovery;
  14
  15 import static org.openhab.binding.airquality.internal.AirQualityBindingConstants.*;
  16 import static org.openhab.binding.airquality.internal.AirQualityConfiguration.LOCATION;
  17
  18 import java.util.HashMap;
  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.ThingUID;
  32 import org.osgi.service.component.annotations.Activate;
  33 import org.osgi.service.component.annotations.Component;
  34 import org.osgi.service.component.annotations.Modified;
  35 import org.osgi.service.component.annotations.Reference;
  36 import org.slf4j.Logger;
  37 import org.slf4j.LoggerFactory;
  38
  39 /**
  40  * The {@link AirQualityDiscoveryService} creates things based on the configured location.
  41  *
  42  * @author Gaël L'hopital - Initial Contribution
  43  */
  44 @Component(service = DiscoveryService.class, configurationPid = "discovery.airquality")
  45 @NonNullByDefault
  46 public class AirQualityDiscoveryService extends AbstractDiscoveryService {
  47     private final Logger logger = LoggerFactory.getLogger(AirQualityDiscoveryService.class);
  48
  49     private static final int DISCOVER_TIMEOUT_SECONDS = 10;
  50     private static final int LOCATION_CHANGED_CHECK_INTERVAL = 60;
  51
  52     private final LocationProvider locationProvider;
  53     private @Nullable ScheduledFuture<?> discoveryJob;
  54     private @Nullable PointType previousLocation;
  55
  56     /**
  57      * Creates a AirQualityDiscoveryService with enabled autostart.
  58      */
  59     @Activate
  60     public AirQualityDiscoveryService(@Reference LocationProvider locationProvider) {
  61         super(SUPPORTED_THING_TYPES, DISCOVER_TIMEOUT_SECONDS, true);
  62         this.locationProvider = locationProvider;
  63     }
  64
  65     @Override
  66     protected void activate(@Nullable Map<String, @Nullable Object> configProperties) {
  67         super.activate(configProperties);
  68     }
  69
  70     @Override
  71     @Modified
  72     protected void modified(@Nullable Map<String, @Nullable Object> configProperties) {
  73         super.modified(configProperties);
  74     }
  75
  76     @Override
  77     protected void startScan() {
  78         logger.debug("Starting Air Quality discovery scan");
  79         PointType location = locationProvider.getLocation();
  80         if (location == null) {
  81             logger.debug("LocationProvider.getLocation() is not set -> Will not provide any discovery results");
  82             return;
  83         }
  84         createResults(location);
  85     }
  86
  87     @Override
  88     protected void startBackgroundDiscovery() {
  89         if (discoveryJob == null) {
  90             discoveryJob = scheduler.scheduleWithFixedDelay(() -> {
  91                 PointType currentLocation = locationProvider.getLocation();
  92                 if (currentLocation != null && !Objects.equals(currentLocation, previousLocation)) {
  93                     logger.debug("Location has been changed from {} to {}: Creating new discovery results",
  94                             previousLocation, currentLocation);
  95                     createResults(currentLocation);
  96                     previousLocation = currentLocation;
  97                 }
  98             }, 0, LOCATION_CHANGED_CHECK_INTERVAL, TimeUnit.SECONDS);
  99             logger.debug("Scheduled Air Qualitylocation-changed job every {} seconds", LOCATION_CHANGED_CHECK_INTERVAL);
 100         }
 101     }
 102
 103     public void createResults(PointType location) {
 104         ThingUID localAirQualityThing = new ThingUID(THING_TYPE_AQI, LOCAL);
 105         Map<String, Object> properties = new HashMap<>();
 106         properties.put(LOCATION, String.format("%s,%s", location.getLatitude(), location.getLongitude()));
 107         thingDiscovered(DiscoveryResultBuilder.create(localAirQualityThing).withLabel("Local Air Quality")
 108                 .withProperties(properties).build());
 109     }
 110
 111     @Override
 112     protected void stopBackgroundDiscovery() {
 113         logger.debug("Stopping Air Quality background discovery");
 114         ScheduledFuture<?> job = this.discoveryJob;
 115         if (job != null && !job.isCancelled()) {
 116             if (job.cancel(true)) {
 117                 discoveryJob = null;
 118                 logger.debug("Stopped Air Quality background discovery");
 119             }
 120         }
 121     }
 122 }