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