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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.chromecast.internal;
  14
  15 import java.util.concurrent.ScheduledExecutorService;
  16 import java.util.concurrent.ScheduledFuture;
  17 import java.util.concurrent.TimeUnit;
  18
  19 import org.eclipse.jdt.annotation.NonNullByDefault;
  20 import org.eclipse.jdt.annotation.Nullable;
  21 import org.slf4j.Logger;
  22 import org.slf4j.LoggerFactory;
  23
  24 /**
  25  * Handles scheduling of connect and refresh events.
  26  *
  27  * @author Jason Holmes - Initial contribution
  28  * @author Wouter Born - Make sure only at most one refresh job is scheduled and running
  29  */
  30 @NonNullByDefault
  31 public class ChromecastScheduler {
  32     private final Logger logger = LoggerFactory.getLogger(ChromecastScheduler.class);
  33
  34     private final ScheduledExecutorService scheduler;
  35     private final long connectDelay;
  36     private final long refreshRate;
  37     private final Runnable connectRunnable;
  38     private final Runnable refreshRunnable;
  39
  40     private @Nullable ScheduledFuture<?> connectFuture;
  41     private @Nullable ScheduledFuture<?> refreshFuture;
  42
  43     public ChromecastScheduler(ScheduledExecutorService scheduler, long connectDelay, Runnable connectRunnable,
  44             long refreshRate, Runnable refreshRunnable) {
  45         this.scheduler = scheduler;
  46         this.connectDelay = connectDelay;
  47         this.connectRunnable = connectRunnable;
  48         this.refreshRate = refreshRate;
  49         this.refreshRunnable = refreshRunnable;
  50     }
  51
  52     public synchronized void destroy() {
  53         cancelConnect();
  54         cancelRefresh();
  55     }
  56
  57     public synchronized void scheduleConnect() {
  58         cancelConnect();
  59         logger.debug("Scheduling connection");
  60         connectFuture = scheduler.schedule(connectRunnable, connectDelay, TimeUnit.SECONDS);
  61     }
  62
  63     private synchronized void cancelConnect() {
  64         logger.debug("Canceling connection");
  65         ScheduledFuture<?> localConnectFuture = connectFuture;
  66         if (localConnectFuture != null) {
  67             localConnectFuture.cancel(true);
  68             connectFuture = null;
  69         }
  70     }
  71
  72     public synchronized void scheduleRefresh() {
  73         cancelRefresh();
  74         logger.debug("Scheduling refresh in {} seconds", refreshRate);
  75         // With an initial delay of 1 second the refresh job can be restarted when several channels are refreshed at
  76         // once e.g. due to channel linking
  77         refreshFuture = scheduler.scheduleWithFixedDelay(refreshRunnable, 1, refreshRate, TimeUnit.SECONDS);
  78     }
  79
  80     public synchronized void cancelRefresh() {
  81         logger.debug("Canceling refresh");
  82         ScheduledFuture<?> localRefreshFuture = refreshFuture;
  83         if (localRefreshFuture != null) {
  84             localRefreshFuture.cancel(true);
  85             refreshFuture = null;
  86         }
  87     }
  88 }