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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.dbquery.internal;
  14
  15 import java.util.Collection;
  16 import java.util.List;
  17 import java.util.concurrent.ScheduledFuture;
  18 import java.util.concurrent.TimeUnit;
  19
  20 import org.eclipse.jdt.annotation.NonNullByDefault;
  21 import org.eclipse.jdt.annotation.Nullable;
  22 import org.openhab.binding.dbquery.action.DBQueryActions;
  23 import org.openhab.binding.dbquery.internal.domain.Database;
  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.thing.binding.ThingHandlerService;
  30 import org.openhab.core.types.Command;
  31 import org.slf4j.Logger;
  32 import org.slf4j.LoggerFactory;
  33
  34 /**
  35  * Base implementation common to all implementation of database bridge
  36  *
  37  * @author Joan Pujol - Initial contribution
  38  */
  39 @NonNullByDefault
  40 public abstract class DatabaseBridgeHandler extends BaseBridgeHandler {
  41     private static final long RETRY_CONNECTION_ATTEMPT_TIME_SECONDS = 60;
  42     private final Logger logger = LoggerFactory.getLogger(DatabaseBridgeHandler.class);
  43     private Database database = Database.EMPTY;
  44     private @Nullable ScheduledFuture<?> retryConnectionAttemptFuture;
  45
  46     public DatabaseBridgeHandler(Bridge bridge) {
  47         super(bridge);
  48     }
  49
  50     @Override
  51     public void initialize() {
  52         initConfig();
  53
  54         database = createDatabase();
  55
  56         connectDatabase();
  57     }
  58
  59     private void connectDatabase() {
  60         logger.debug("connectDatabase {}", database);
  61         var completable = database.connect();
  62         updateStatus(ThingStatus.UNKNOWN);
  63         completable.thenAccept(result -> {
  64             if (result) {
  65                 logger.trace("Succesfully connected to database {}", getThing().getUID());
  66                 updateStatus(ThingStatus.ONLINE);
  67             } else {
  68                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "Connect to database failed");
  69                 if (retryConnectionAttemptFuture == null) {
  70                     scheduleRetryConnectionAttempt();
  71                 }
  72             }
  73         });
  74     }
  75
  76     protected void scheduleRetryConnectionAttempt() {
  77         logger.trace("Scheduled retry connection attempt every {}", RETRY_CONNECTION_ATTEMPT_TIME_SECONDS);
  78         retryConnectionAttemptFuture = scheduler.scheduleWithFixedDelay(this::connectDatabase,
  79                 RETRY_CONNECTION_ATTEMPT_TIME_SECONDS, RETRY_CONNECTION_ATTEMPT_TIME_SECONDS, TimeUnit.SECONDS);
  80     }
  81
  82     protected abstract void initConfig();
  83
  84     @Override
  85     public void dispose() {
  86         cancelRetryConnectionAttemptIfPresent();
  87         disconnectDatabase();
  88     }
  89
  90     protected void cancelRetryConnectionAttemptIfPresent() {
  91         ScheduledFuture<?> currentFuture = retryConnectionAttemptFuture;
  92         if (currentFuture != null) {
  93             currentFuture.cancel(true);
  94         }
  95     }
  96
  97     private void disconnectDatabase() {
  98         var completable = database.disconnect();
  99         updateStatus(ThingStatus.UNKNOWN);
 100         completable.thenAccept(result -> {
 101             if (result) {
 102                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.GONE, "Successfully disconnected to database");
 103             } else {
 104                 updateStatus(ThingStatus.UNKNOWN, ThingStatusDetail.COMMUNICATION_ERROR,
 105                         "Disconnect to database failed");
 106             }
 107         });
 108     }
 109
 110     @Override
 111     public void handleCommand(ChannelUID channelUID, Command command) {
 112         // No commands supported
 113     }
 114
 115     abstract Database createDatabase();
 116
 117     public Database getDatabase() {
 118         return database;
 119     }
 120
 121     @Override
 122     public Collection<Class<? extends ThingHandlerService>> getServices() {
 123         return List.of(DBQueryActions.class);
 124     }
 125 }