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   1 /**
   2  * Copyright (c) 2010-2023 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.iammeter.internal;
  14
  15 import java.io.IOException;
  16 import java.time.Duration;
  17 import java.util.concurrent.ScheduledFuture;
  18 import java.util.concurrent.TimeUnit;
  19
  20 import javax.measure.Unit;
  21
  22 import org.eclipse.jdt.annotation.NonNullByDefault;
  23 import org.eclipse.jdt.annotation.Nullable;
  24 import org.openhab.core.cache.ExpiringCache;
  25 import org.openhab.core.io.net.http.HttpUtil;
  26 import org.openhab.core.library.types.QuantityType;
  27 import org.openhab.core.thing.ChannelUID;
  28 import org.openhab.core.thing.Thing;
  29 import org.openhab.core.thing.ThingStatus;
  30 import org.openhab.core.thing.ThingStatusDetail;
  31 import org.openhab.core.thing.binding.BaseThingHandler;
  32 import org.openhab.core.types.Command;
  33 import org.openhab.core.types.RefreshType;
  34 import org.openhab.core.types.State;
  35 import org.openhab.core.types.UnDefType;
  36 import org.slf4j.Logger;
  37 import org.slf4j.LoggerFactory;
  38
  39 import com.google.gson.JsonSyntaxException;
  40
  41 /**
  42  * The {@link IammeterHandler} is responsible for handling commands, which are
  43  * sent to one of the channels.
  44  *
  45  * @author Yang Bo - Initial contribution
  46  */
  47
  48 @NonNullByDefault
  49 public abstract class IammeterBaseHandler extends BaseThingHandler {
  50
  51     private final Logger logger = LoggerFactory.getLogger(IammeterBaseHandler.class);
  52     private @Nullable ScheduledFuture<?> refreshJob;
  53     private IammeterConfiguration config;
  54     private static final int TIMEOUT_MS = 5000;
  55     private final ExpiringCache<Boolean> refreshCache = new ExpiringCache<>(Duration.ofSeconds(5), this::refresh);
  56
  57     public IammeterBaseHandler(Thing thing) {
  58         super(thing);
  59         config = getConfiguration();
  60     }
  61
  62     @Override
  63     public void handleCommand(ChannelUID channelUID, Command command) {
  64         if (command instanceof RefreshType) {
  65             refreshCache.getValue();
  66         }
  67     }
  68
  69     @Override
  70     public void initialize() {
  71         ScheduledFuture<?> refreshJob = this.refreshJob;
  72         config = getConfiguration();
  73         if (refreshJob == null) {
  74             refreshJob = scheduler.scheduleWithFixedDelay(this::refresh, 0, config.refreshInterval, TimeUnit.SECONDS);
  75             this.refreshJob = refreshJob;
  76             updateStatus(ThingStatus.UNKNOWN);
  77         }
  78     }
  79
  80     protected abstract void resolveData(String response);
  81
  82     @SuppressWarnings("null")
  83     private boolean refresh() {
  84         refreshCache.invalidateValue();
  85         IammeterConfiguration config = this.config;
  86         try {
  87             String httpMethod = "GET";
  88             String url = "http://" + config.username + ":" + config.password + "@" + config.host + ":" + config.port
  89                     + "/monitorjson";
  90             String response = HttpUtil.executeUrl(httpMethod, url, TIMEOUT_MS);
  91             resolveData(response);
  92             updateStatus(ThingStatus.ONLINE);
  93             return true;
  94             // Very rudimentary Exception differentiation
  95         } catch (IOException e) {
  96             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR,
  97                     "Communication error with the device: " + e.getMessage());
  98         } catch (JsonSyntaxException je) {
  99             logger.warn("Invalid JSON when refreshing source {}: {}", getThing().getUID(), je.getMessage());
 100             updateStatus(ThingStatus.OFFLINE);
 101         }
 102         return false;
 103     }
 104
 105     protected State getQuantityState(String value, Unit<?> unit) {
 106         try {
 107             return QuantityType.valueOf(Float.parseFloat(value), unit);
 108         } catch (NumberFormatException e) {
 109             return UnDefType.UNDEF;
 110         }
 111     }
 112
 113     @Override
 114     public void dispose() {
 115         ScheduledFuture<?> refreshJob = this.refreshJob;
 116         if (refreshJob != null && !refreshJob.isCancelled()) {
 117             refreshJob.cancel(true);
 118             this.refreshJob = null;
 119         }
 120         super.dispose();
 121     }
 122
 123     public IammeterConfiguration getConfiguration() {
 124         return this.getConfigAs(IammeterConfiguration.class);
 125     }
 126 }