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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.wlanthermo.internal;
  14
  15 import java.net.URISyntaxException;
  16 import java.util.concurrent.*;
  17
  18 import org.eclipse.jdt.annotation.NonNullByDefault;
  19 import org.eclipse.jdt.annotation.Nullable;
  20 import org.eclipse.jetty.client.HttpClient;
  21 import org.openhab.binding.wlanthermo.internal.api.mini.builtin.App;
  22 import org.openhab.binding.wlanthermo.internal.api.mini.builtin.WlanThermoMiniCommandHandler;
  23 import org.openhab.core.common.ThreadPoolManager;
  24 import org.openhab.core.thing.*;
  25 import org.openhab.core.thing.binding.BaseThingHandler;
  26 import org.openhab.core.types.Command;
  27 import org.openhab.core.types.RefreshType;
  28 import org.openhab.core.types.State;
  29 import org.openhab.core.types.UnDefType;
  30 import org.slf4j.Logger;
  31 import org.slf4j.LoggerFactory;
  32
  33 import com.google.gson.Gson;
  34
  35 /**
  36  * The {@link WlanThermoMiniHandler} is responsible for handling commands, which are
  37  * sent to one of the channels.
  38  *
  39  * @author Christian Schlipp - Initial contribution
  40  */
  41 @NonNullByDefault
  42 public class WlanThermoMiniHandler extends BaseThingHandler {
  43
  44     private final Logger logger = LoggerFactory.getLogger(WlanThermoMiniHandler.class);
  45     private final WlanThermoMiniCommandHandler wlanThermoMiniCommandHandler = new WlanThermoMiniCommandHandler();
  46
  47     private WlanThermoMiniConfiguration config = new WlanThermoMiniConfiguration();
  48     private final HttpClient httpClient;
  49     private @Nullable ScheduledFuture<?> pollingScheduler;
  50     private final ScheduledExecutorService scheduler = ThreadPoolManager
  51             .getScheduledPool(WlanThermoBindingConstants.WLANTHERMO_THREAD_POOL);
  52     private final Gson gson = new Gson();
  53     private App app = new App();
  54
  55     public WlanThermoMiniHandler(Thing thing, HttpClient httpClient) {
  56         super(thing);
  57         this.httpClient = httpClient;
  58     }
  59
  60     @Override
  61     public void initialize() {
  62         logger.debug("Start initializing WlanThermo Mini!");
  63         config = getConfigAs(WlanThermoMiniConfiguration.class);
  64
  65         updateStatus(ThingStatus.UNKNOWN);
  66         scheduler.schedule(this::checkConnection, config.getPollingInterval(), TimeUnit.SECONDS);
  67
  68         logger.debug("Finished initializing WlanThermo Mini!");
  69     }
  70
  71     private void checkConnection() {
  72         try {
  73             if (httpClient.GET(config.getUri("/app.php")).getStatus() == 200) {
  74                 updateStatus(ThingStatus.ONLINE);
  75                 ScheduledFuture<?> oldScheduler = pollingScheduler;
  76                 if (oldScheduler != null) {
  77                     oldScheduler.cancel(false);
  78                 }
  79                 pollingScheduler = scheduler.scheduleWithFixedDelay(this::update, 0, config.getPollingInterval(),
  80                         TimeUnit.SECONDS);
  81             } else {
  82                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
  83                         "WlanThermo not found under given address.");
  84             }
  85         } catch (URISyntaxException | InterruptedException | ExecutionException | TimeoutException e) {
  86             logger.debug("Failed to connect.", e);
  87             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
  88                     "Could not connect to WlanThermo at " + config.getIpAddress());
  89             ScheduledFuture<?> oldScheduler = pollingScheduler;
  90             if (oldScheduler != null) {
  91                 oldScheduler.cancel(false);
  92             }
  93             pollingScheduler = scheduler.schedule(this::checkConnection, config.getPollingInterval(), TimeUnit.SECONDS);
  94         }
  95     }
  96
  97     @Override
  98     public void handleCommand(ChannelUID channelUID, Command command) {
  99         if (command instanceof RefreshType) {
 100             State s = wlanThermoMiniCommandHandler.getState(channelUID, app);
 101             if (s != null)
 102                 updateState(channelUID, s);
 103         }
 104         // Mini is read only!
 105     }
 106
 107     private void update() {
 108         try {
 109             // Update objects with data from device
 110             String json = httpClient.GET(config.getUri("/app.php")).getContentAsString();
 111             app = gson.fromJson(json, App.class);
 112             logger.debug("Received at /app.php: {}", json);
 113
 114             // Update channels
 115             for (Channel channel : thing.getChannels()) {
 116                 State state = wlanThermoMiniCommandHandler.getState(channel.getUID(), app);
 117                 if (state != null) {
 118                     updateState(channel.getUID(), state);
 119                 } else {
 120                     String trigger = wlanThermoMiniCommandHandler.getTrigger(channel.getUID(), app);
 121                     if (trigger != null) {
 122                         triggerChannel(channel.getUID(), trigger);
 123                     }
 124                 }
 125
 126             }
 127
 128         } catch (URISyntaxException | InterruptedException | ExecutionException | TimeoutException e) {
 129             logger.debug("Update failed, checking connection", e);
 130             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "Update failed, reconnecting...");
 131             ScheduledFuture<?> oldScheduler = pollingScheduler;
 132             if (oldScheduler != null) {
 133                 oldScheduler.cancel(false);
 134             }
 135             for (Channel channel : thing.getChannels()) {
 136                 updateState(channel.getUID(), UnDefType.UNDEF);
 137             }
 138             checkConnection();
 139         }
 140     }
 141
 142     @Override
 143     public void dispose() {
 144         ScheduledFuture<?> oldScheduler = pollingScheduler;
 145         if (oldScheduler != null) {
 146             boolean stopped = oldScheduler.cancel(true);
 147             logger.debug("Stopped polling: {}", stopped);
 148         }
 149         pollingScheduler = null;
 150     }
 151 }