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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.fronius.internal.handler;
  14
  15 import java.io.IOException;
  16 import java.util.HashSet;
  17 import java.util.Set;
  18 import java.util.concurrent.ScheduledFuture;
  19 import java.util.concurrent.TimeUnit;
  20
  21 import org.openhab.binding.fronius.internal.FroniusBridgeConfiguration;
  22 import org.openhab.core.io.net.http.HttpUtil;
  23 import org.openhab.core.thing.Bridge;
  24 import org.openhab.core.thing.ChannelUID;
  25 import org.openhab.core.thing.ThingStatus;
  26 import org.openhab.core.thing.ThingStatusDetail;
  27 import org.openhab.core.thing.binding.BaseBridgeHandler;
  28 import org.openhab.core.types.Command;
  29 import org.slf4j.Logger;
  30 import org.slf4j.LoggerFactory;
  31
  32 /**
  33  * Bridge for Fronius devices.
  34  *
  35  * @author Gerrit Beine - Initial contribution
  36  * @author Thomas Rokohl - Refactoring to merge the concepts.
  37  *         Check if host is reachable.
  38  */
  39 public class FroniusBridgeHandler extends BaseBridgeHandler {
  40
  41     private final Logger logger = LoggerFactory.getLogger(FroniusBridgeHandler.class);
  42     private static final int DEFAULT_REFRESH_PERIOD = 10;
  43     private final Set<FroniusBaseThingHandler> services = new HashSet<>();
  44     private ScheduledFuture<?> refreshJob;
  45
  46     public FroniusBridgeHandler(Bridge bridge) {
  47         super(bridge);
  48     }
  49
  50     @Override
  51     public void handleCommand(ChannelUID channelUID, Command command) {
  52     }
  53
  54     public void registerService(final FroniusBaseThingHandler service) {
  55         this.services.add(service);
  56     }
  57
  58     @Override
  59     public void initialize() {
  60         final FroniusBridgeConfiguration config = getConfigAs(FroniusBridgeConfiguration.class);
  61
  62         boolean validConfig = true;
  63         String errorMsg = null;
  64
  65         String hostname = config.hostname;
  66         if (hostname == null || hostname.isBlank()) {
  67             errorMsg = "Parameter 'hostname' is mandatory and must be configured";
  68             validConfig = false;
  69         }
  70
  71         if (config.refreshInterval != null && config.refreshInterval <= 0) {
  72             errorMsg = "Parameter 'refresh' must be at least 1 second";
  73             validConfig = false;
  74         }
  75
  76         if (validConfig) {
  77             startAutomaticRefresh(config);
  78         } else {
  79             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR, errorMsg);
  80         }
  81     }
  82
  83     @Override
  84     public void dispose() {
  85         if (refreshJob != null) {
  86             refreshJob.cancel(true);
  87         }
  88         services.clear();
  89     }
  90
  91     /**
  92      * Start the job refreshing the data
  93      */
  94     private void startAutomaticRefresh(FroniusBridgeConfiguration config) {
  95         if (refreshJob == null || refreshJob.isCancelled()) {
  96             Runnable runnable = () -> {
  97                 boolean online = false;
  98                 try {
  99                     if (HttpUtil.executeUrl("GET", "http://" + config.hostname, 5000) != null) {
 100                         online = true;
 101                     }
 102                 } catch (IOException e) {
 103                     logger.debug("Connection Error: {}", e.getMessage());
 104                 }
 105
 106                 if (!online) {
 107                     updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.OFFLINE.COMMUNICATION_ERROR,
 108                             "hostname or ip is not reachable");
 109                 } else {
 110                     updateStatus(ThingStatus.ONLINE);
 111                     for (FroniusBaseThingHandler service : services) {
 112                         service.refresh(config);
 113                     }
 114                 }
 115             };
 116
 117             int delay = (config.refreshInterval != null) ? config.refreshInterval.intValue() : DEFAULT_REFRESH_PERIOD;
 118             refreshJob = scheduler.scheduleWithFixedDelay(runnable, 0, delay, TimeUnit.SECONDS);
 119         }
 120     }
 121 }