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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.mqtt.homeassistant.internal.listener;
  14
  15 import java.util.concurrent.ScheduledExecutorService;
  16 import java.util.concurrent.ScheduledFuture;
  17 import java.util.concurrent.TimeUnit;
  18 import java.util.concurrent.atomic.AtomicReference;
  19
  20 import org.eclipse.jdt.annotation.NonNullByDefault;
  21 import org.eclipse.jdt.annotation.Nullable;
  22 import org.openhab.binding.mqtt.generic.AvailabilityTracker;
  23 import org.openhab.binding.mqtt.generic.ChannelStateUpdateListener;
  24 import org.openhab.binding.mqtt.generic.values.Value;
  25 import org.openhab.core.thing.ChannelUID;
  26 import org.openhab.core.types.State;
  27
  28 /**
  29  * A listener to reset the channel value after a timeout.
  30  *
  31  * @author Jochen Klein - Initial contribution
  32  */
  33 @NonNullByDefault
  34 public class ExpireUpdateStateListener extends ChannelStateUpdateListenerProxy {
  35
  36     private final int expireAfter;
  37     private final Value value;
  38     private final AvailabilityTracker tracker;
  39     private final ScheduledExecutorService scheduler;
  40
  41     private final AtomicReference<@Nullable ScheduledFuture<?>> expire = new AtomicReference<>();
  42
  43     public ExpireUpdateStateListener(ChannelStateUpdateListener original, int expireAfter, Value value,
  44             AvailabilityTracker tracker, ScheduledExecutorService scheduler) {
  45         super(original);
  46         this.expireAfter = expireAfter;
  47         this.value = value;
  48         this.tracker = tracker;
  49         this.scheduler = scheduler;
  50     }
  51
  52     @Override
  53     public void updateChannelState(final ChannelUID channelUID, State state) {
  54         super.updateChannelState(channelUID, state);
  55
  56         ScheduledFuture<?> oldExpire = expire.getAndSet(scheduler.schedule(() -> {
  57             value.resetState();
  58             tracker.resetMessageReceived();
  59             ExpireUpdateStateListener.super.updateChannelState(channelUID, value.getChannelState());
  60         }, expireAfter, TimeUnit.SECONDS));
  61
  62         if (oldExpire != null) {
  63             oldExpire.cancel(false);
  64         }
  65     }
  66 }