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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.systeminfo.internal.handler;
  14
  15 import static org.openhab.binding.systeminfo.internal.SysteminfoBindingConstants.*;
  16
  17 import java.math.BigDecimal;
  18 import java.util.ArrayList;
  19 import java.util.Collections;
  20 import java.util.HashSet;
  21 import java.util.Iterator;
  22 import java.util.List;
  23 import java.util.Map;
  24 import java.util.Set;
  25 import java.util.concurrent.ScheduledFuture;
  26 import java.util.concurrent.TimeUnit;
  27 import java.util.stream.Collectors;
  28
  29 import org.eclipse.jdt.annotation.NonNullByDefault;
  30 import org.eclipse.jdt.annotation.Nullable;
  31 import org.openhab.binding.systeminfo.internal.SysteminfoThingTypeProvider;
  32 import org.openhab.binding.systeminfo.internal.model.DeviceNotFoundException;
  33 import org.openhab.binding.systeminfo.internal.model.SysteminfoInterface;
  34 import org.openhab.core.cache.ExpiringCache;
  35 import org.openhab.core.cache.ExpiringCacheMap;
  36 import org.openhab.core.config.core.Configuration;
  37 import org.openhab.core.library.types.DecimalType;
  38 import org.openhab.core.library.types.PercentType;
  39 import org.openhab.core.library.types.QuantityType;
  40 import org.openhab.core.library.unit.Units;
  41 import org.openhab.core.thing.Channel;
  42 import org.openhab.core.thing.ChannelUID;
  43 import org.openhab.core.thing.Thing;
  44 import org.openhab.core.thing.ThingStatus;
  45 import org.openhab.core.thing.ThingStatusDetail;
  46 import org.openhab.core.thing.ThingTypeUID;
  47 import org.openhab.core.thing.ThingUID;
  48 import org.openhab.core.thing.binding.BaseThingHandler;
  49 import org.openhab.core.thing.binding.builder.ThingBuilder;
  50 import org.openhab.core.thing.type.ChannelGroupDefinition;
  51 import org.openhab.core.types.Command;
  52 import org.openhab.core.types.RefreshType;
  53 import org.openhab.core.types.State;
  54 import org.openhab.core.types.UnDefType;
  55 import org.slf4j.Logger;
  56 import org.slf4j.LoggerFactory;
  57
  58 /**
  59  * The {@link SysteminfoHandler} is responsible for providing real time information about the system
  60  * (CPU, Memory, Storage, Display and others).
  61  *
  62  * @author Svilen Valkanov - Initial contribution
  63  * @author Lyubomir Papzov - Separate the creation of the systeminfo object and its initialization
  64  * @author Wouter Born - Add null annotations
  65  * @author Mark Herwege - Add dynamic creation of extra channels
  66  */
  67 @NonNullByDefault
  68 public class SysteminfoHandler extends BaseThingHandler {
  69     /**
  70      * Refresh interval for {@link #highPriorityChannels} in seconds.
  71      */
  72     private @NonNullByDefault({}) BigDecimal refreshIntervalHighPriority;
  73
  74     /**
  75      * Refresh interval for {@link #mediumPriorityChannels} in seconds.
  76      */
  77     private @NonNullByDefault({}) BigDecimal refreshIntervalMediumPriority;
  78
  79     /**
  80      * Channels with priority configuration parameter set to High. They usually need frequent update of the state like
  81      * CPU load, or information about the free and used memory.
  82      * They are updated periodically at {@link #refreshIntervalHighPriority}.
  83      */
  84     private final Set<ChannelUID> highPriorityChannels = new HashSet<>();
  85
  86     /**
  87      * Channels with priority configuration parameter set to Medium. These channels usually need update of the
  88      * state not so oft like battery capacity, storage used and etc.
  89      * They are updated periodically at {@link #refreshIntervalMediumPriority}.
  90      */
  91     private final Set<ChannelUID> mediumPriorityChannels = new HashSet<>();
  92
  93     /**
  94      * Channels with priority configuration parameter set to Low. They represent static information or information
  95      * that is updated rare- e.g. CPU name, storage name and etc.
  96      * They are updated only at {@link #initialize()}.
  97      */
  98     private final Set<ChannelUID> lowPriorityChannels = new HashSet<>();
  99
 100     /**
 101      * Wait time for the creation of Item-Channel links in seconds. This delay is needed, because the Item-Channel
 102      * links have to be created before the thing state is updated, otherwise item state will not be updated.
 103      */
 104     public static final int WAIT_TIME_CHANNEL_ITEM_LINK_INIT = 1;
 105
 106     /**
 107      * String used to extend thingUID and channelGroupTypeUID for thing definition with added dynamic channels and
 108      * extended channels. It is set in the constructor and unique to the thing.
 109      */
 110     public final String idExtString;
 111
 112     public final SysteminfoThingTypeProvider thingTypeProvider;
 113
 114     private SysteminfoInterface systeminfo;
 115
 116     private @Nullable ScheduledFuture<?> highPriorityTasks;
 117     private @Nullable ScheduledFuture<?> mediumPriorityTasks;
 118
 119     /**
 120      * Caches for cpu process load and process load for a given pid. Using this cache limits the process load refresh
 121      * interval to the minimum interval. Too frequent refreshes leads to inaccurate results. This could happen when the
 122      * same process is tracked as current process and as a channel with pid parameter, or when the task interval is set
 123      * too low.
 124      */
 125     private static final int MIN_PROCESS_LOAD_REFRESH_INTERVAL_MS = 2000;
 126     private ExpiringCache<PercentType> cpuLoadCache = new ExpiringCache<>(MIN_PROCESS_LOAD_REFRESH_INTERVAL_MS,
 127             () -> getSystemCpuLoad());
 128     private ExpiringCacheMap<Integer, @Nullable DecimalType> processLoadCache = new ExpiringCacheMap<>(
 129             MIN_PROCESS_LOAD_REFRESH_INTERVAL_MS);
 130
 131     private final Logger logger = LoggerFactory.getLogger(SysteminfoHandler.class);
 132
 133     public SysteminfoHandler(Thing thing, SysteminfoThingTypeProvider thingTypeProvider,
 134             SysteminfoInterface systeminfo) {
 135         super(thing);
 136         this.thingTypeProvider = thingTypeProvider;
 137         this.systeminfo = systeminfo;
 138
 139         idExtString = "-" + thing.getUID().getId();
 140     }
 141
 142     @Override
 143     public void initialize() {
 144         logger.trace("Initializing thing {} with thing type {}", thing.getUID().getId(),
 145                 thing.getThingTypeUID().getId());
 146         restoreChannelsConfig(); // After a thing type change, previous channel configs will have been stored, and will
 147                                  // be restored here.
 148         if (instantiateSysteminfoLibrary() && isConfigurationValid() && updateProperties()) {
 149             if (!addDynamicChannels()) { // If there are new channel groups, the thing will get recreated with a new
 150                                          // thing type and this handler will be disposed. Therefore do not do anything
 151                                          // further here.
 152                 groupChannelsByPriority();
 153                 scheduleUpdates();
 154                 updateStatus(ThingStatus.ONLINE);
 155             }
 156         } else {
 157             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.HANDLER_INITIALIZING_ERROR,
 158                     "@text/offline.cannot-initialize");
 159         }
 160     }
 161
 162     private boolean instantiateSysteminfoLibrary() {
 163         try {
 164             systeminfo.initializeSysteminfo();
 165             logger.debug("Systeminfo implementation is instantiated!");
 166             return true;
 167         } catch (Exception e) {
 168             logger.warn("Cannot instantiate Systeminfo object!", e);
 169             return false;
 170         }
 171     }
 172
 173     private boolean isConfigurationValid() {
 174         logger.debug("Start reading Thing configuration.");
 175         try {
 176             refreshIntervalMediumPriority = (BigDecimal) this.thing.getConfiguration()
 177                     .get(MEDIUM_PRIORITY_REFRESH_TIME);
 178             refreshIntervalHighPriority = (BigDecimal) this.thing.getConfiguration().get(HIGH_PRIORITY_REFRESH_TIME);
 179
 180             if (refreshIntervalHighPriority.intValue() <= 0 || refreshIntervalMediumPriority.intValue() <= 0) {
 181                 throw new IllegalArgumentException("Refresh time must be positive number!");
 182             }
 183             logger.debug("Refresh time for medium priority channels set to {} s", refreshIntervalMediumPriority);
 184             logger.debug("Refresh time for high priority channels set to {} s", refreshIntervalHighPriority);
 185             return true;
 186         } catch (IllegalArgumentException e) {
 187             logger.warn("Refresh time value is invalid! Please change the thing configuration!");
 188             return false;
 189         } catch (ClassCastException e) {
 190             logger.debug("Channel configuration cannot be read!");
 191             return false;
 192         }
 193     }
 194
 195     private boolean updateProperties() {
 196         Map<String, String> properties = editProperties();
 197         try {
 198             properties.put(PROPERTY_CPU_LOGICAL_CORES, systeminfo.getCpuLogicalCores().toString());
 199             properties.put(PROPERTY_CPU_PHYSICAL_CORES, systeminfo.getCpuPhysicalCores().toString());
 200             properties.put(PROPERTY_OS_FAMILY, systeminfo.getOsFamily().toString());
 201             properties.put(PROPERTY_OS_MANUFACTURER, systeminfo.getOsManufacturer().toString());
 202             properties.put(PROPERTY_OS_VERSION, systeminfo.getOsVersion().toString());
 203             updateProperties(properties);
 204             logger.debug("Properties updated!");
 205             return true;
 206         } catch (Exception e) {
 207             logger.debug("Cannot get system properties! Please try to restart the binding.", e);
 208             return false;
 209         }
 210     }
 211
 212     /**
 213      * Retrieve info on available storages, drives, displays, batteries, network interfaces and fans in the system. If
 214      * there is more than 1, create additional channel groups and channels representing each of the entities with an
 215      * index added to the channel groups and channels. The base channel groups and channels will remain without index
 216      * and are equal to the channel groups and channels with index 0. If there is only one entity in a group, do not add
 217      * a channels group and channels with index 0.
 218      * <p>
 219      * If channel groups are added, the thing type will change to systeminfo:computer-Ext, with Ext equal to the thing
 220      * id. A new handler will be created and initialization restarted. Therefore further initialization of the current
 221      * handler can be aborted if the method returns true.
 222      *
 223      * @return true if channel groups where added
 224      */
 225     private boolean addDynamicChannels() {
 226         ThingUID thingUID = thing.getUID();
 227
 228         List<ChannelGroupDefinition> newChannelGroups = new ArrayList<>();
 229         newChannelGroups.addAll(createChannelGroups(thingUID, CHANNEL_GROUP_STORAGE, CHANNEL_GROUP_TYPE_STORAGE,
 230                 systeminfo.getFileOSStoreCount()));
 231         newChannelGroups.addAll(createChannelGroups(thingUID, CHANNEL_GROUP_DRIVE, CHANNEL_GROUP_TYPE_DRIVE,
 232                 systeminfo.getDriveCount()));
 233         newChannelGroups.addAll(createChannelGroups(thingUID, CHANNEL_GROUP_DISPLAY, CHANNEL_GROUP_TYPE_DISPLAY,
 234                 systeminfo.getDisplayCount()));
 235         newChannelGroups.addAll(createChannelGroups(thingUID, CHANNEL_GROUP_BATTERY, CHANNEL_GROUP_TYPE_BATTERY,
 236                 systeminfo.getPowerSourceCount()));
 237         newChannelGroups.addAll(createChannelGroups(thingUID, CHANNEL_GROUP_NETWORK, CHANNEL_GROUP_TYPE_NETWORK,
 238                 systeminfo.getNetworkIFCount()));
 239         if (!newChannelGroups.isEmpty()) {
 240             logger.debug("Creating additional channel groups");
 241             newChannelGroups.addAll(0, thingTypeProvider.getChannelGroupDefinitions(thing.getThingTypeUID()));
 242             ThingTypeUID thingTypeUID = new ThingTypeUID(BINDING_ID, THING_TYPE_COMPUTER_ID + idExtString);
 243             if (thingTypeProvider.updateThingType(thingTypeUID, newChannelGroups)) {
 244                 logger.trace("Channel groups were added, changing the thing type");
 245                 changeThingType(thingTypeUID, thing.getConfiguration());
 246             } else {
 247                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.HANDLER_INITIALIZING_ERROR,
 248                         "@text/offline.cannot-initialize");
 249             }
 250             return true;
 251         }
 252
 253         List<Channel> newChannels = new ArrayList<>();
 254         newChannels.addAll(createChannels(thingUID, CHANNEL_SENSORS_FAN_SPEED, systeminfo.getFanCount()));
 255         if (!newChannels.isEmpty()) {
 256             logger.debug("Creating additional channels");
 257             newChannels.addAll(0, thing.getChannels());
 258             ThingBuilder thingBuilder = editThing();
 259             thingBuilder.withChannels(newChannels);
 260             updateThing(thingBuilder.build());
 261         }
 262
 263         return false;
 264     }
 265
 266     private List<ChannelGroupDefinition> createChannelGroups(ThingUID thingUID, String channelGroupID,
 267             String channelGroupTypeID, int count) {
 268         if (count <= 1) {
 269             return Collections.emptyList();
 270         }
 271
 272         List<String> channelGroups = thingTypeProvider.getChannelGroupDefinitions(thing.getThingTypeUID()).stream()
 273                 .map(ChannelGroupDefinition::getId).collect(Collectors.toList());
 274
 275         List<ChannelGroupDefinition> newChannelGroups = new ArrayList<>();
 276         for (int i = 0; i < count; i++) {
 277             String index = String.valueOf(i);
 278             ChannelGroupDefinition channelGroupDef = thingTypeProvider
 279                     .createChannelGroupDefinitionWithIndex(channelGroupID, channelGroupTypeID, i);
 280             if (!(channelGroupDef == null || channelGroups.contains(channelGroupID + index))) {
 281                 logger.trace("Adding channel group {}", channelGroupID + index);
 282                 newChannelGroups.add(channelGroupDef);
 283             }
 284         }
 285         return newChannelGroups;
 286     }
 287
 288     private List<Channel> createChannels(ThingUID thingUID, String channelID, int count) {
 289         if (count <= 1) {
 290             return Collections.emptyList();
 291         }
 292
 293         List<Channel> newChannels = new ArrayList<>();
 294         for (int i = 0; i < count; i++) {
 295             Channel channel = thingTypeProvider.createChannelWithIndex(thing, channelID, i);
 296             if (channel != null && thing.getChannel(channel.getUID()) == null) {
 297                 logger.trace("Creating channel {}", channel.getUID().getId());
 298                 newChannels.add(channel);
 299             }
 300         }
 301         return newChannels;
 302     }
 303
 304     private void storeChannelsConfig() {
 305         logger.trace("Storing channel configurations");
 306         thingTypeProvider.storeChannelsConfig(thing);
 307     }
 308
 309     private void restoreChannelsConfig() {
 310         logger.trace("Restoring channel configurations");
 311         Map<String, Configuration> channelsConfig = thingTypeProvider.restoreChannelsConfig(thing.getUID());
 312         for (String channelId : channelsConfig.keySet()) {
 313             Channel channel = thing.getChannel(channelId);
 314             Configuration config = channelsConfig.get(channelId);
 315             if (channel != null && config != null) {
 316                 Configuration currentConfig = channel.getConfiguration();
 317                 for (String param : config.keySet()) {
 318                     if (isConfigurationKeyChanged(currentConfig, config, param)) {
 319                         handleChannelConfigurationChange(channel, config, param);
 320                     }
 321                 }
 322             }
 323         }
 324     }
 325
 326     private void groupChannelsByPriority() {
 327         logger.trace("Grouping channels by priority");
 328         List<Channel> channels = this.thing.getChannels();
 329
 330         for (Channel channel : channels) {
 331             Configuration properties = channel.getConfiguration();
 332             String priority = (String) properties.get(PRIOIRITY_PARAM);
 333             if (priority == null) {
 334                 logger.debug("Channel with UID {} will not be updated. The channel has no priority set!",
 335                         channel.getUID());
 336                 break;
 337             }
 338             switch (priority) {
 339                 case "High":
 340                     highPriorityChannels.add(channel.getUID());
 341                     break;
 342                 case "Medium":
 343                     mediumPriorityChannels.add(channel.getUID());
 344                     break;
 345                 case "Low":
 346                     lowPriorityChannels.add(channel.getUID());
 347                     break;
 348                 default:
 349                     logger.debug("Invalid priority configuration parameter. Channel will not be updated!");
 350             }
 351         }
 352     }
 353
 354     private void changeChannelPriority(ChannelUID channelUID, String priority) {
 355         switch (priority) {
 356             case "High":
 357                 mediumPriorityChannels.remove(channelUID);
 358                 lowPriorityChannels.remove(channelUID);
 359                 highPriorityChannels.add(channelUID);
 360                 break;
 361             case "Medium":
 362                 lowPriorityChannels.remove(channelUID);
 363                 highPriorityChannels.remove(channelUID);
 364                 mediumPriorityChannels.add(channelUID);
 365                 break;
 366             case "Low":
 367                 highPriorityChannels.remove(channelUID);
 368                 mediumPriorityChannels.remove(channelUID);
 369                 lowPriorityChannels.add(channelUID);
 370                 break;
 371             default:
 372                 logger.debug("Invalid priority configuration parameter. Channel will not be updated!");
 373         }
 374     }
 375
 376     private void scheduleUpdates() {
 377         logger.debug("Schedule high priority tasks at fixed rate {} s", refreshIntervalHighPriority);
 378         highPriorityTasks = scheduler.scheduleWithFixedDelay(() -> {
 379             publishData(highPriorityChannels);
 380         }, WAIT_TIME_CHANNEL_ITEM_LINK_INIT, refreshIntervalHighPriority.intValue(), TimeUnit.SECONDS);
 381
 382         logger.debug("Schedule medium priority tasks at fixed rate {} s", refreshIntervalMediumPriority);
 383         mediumPriorityTasks = scheduler.scheduleWithFixedDelay(() -> {
 384             publishData(mediumPriorityChannels);
 385         }, WAIT_TIME_CHANNEL_ITEM_LINK_INIT, refreshIntervalMediumPriority.intValue(), TimeUnit.SECONDS);
 386
 387         logger.debug("Schedule one time update for low priority tasks");
 388         scheduler.schedule(() -> {
 389             publishData(lowPriorityChannels);
 390         }, WAIT_TIME_CHANNEL_ITEM_LINK_INIT, TimeUnit.SECONDS);
 391     }
 392
 393     private void publishData(Set<ChannelUID> channels) {
 394         // if handler disposed while waiting for the links, don't update the channel states
 395         if (!ThingStatus.ONLINE.equals(thing.getStatus())) {
 396             return;
 397         }
 398         Iterator<ChannelUID> iter = channels.iterator();
 399         while (iter.hasNext()) {
 400             ChannelUID channeUID = iter.next();
 401             if (isLinked(channeUID.getId())) {
 402                 publishDataForChannel(channeUID);
 403             }
 404         }
 405     }
 406
 407     private void publishDataForChannel(ChannelUID channelUID) {
 408         State state = getInfoForChannel(channelUID);
 409         String channelID = channelUID.getId();
 410         updateState(channelID, state);
 411     }
 412
 413     public Set<ChannelUID> getHighPriorityChannels() {
 414         return highPriorityChannels;
 415     }
 416
 417     public Set<ChannelUID> getMediumPriorityChannels() {
 418         return mediumPriorityChannels;
 419     }
 420
 421     public Set<ChannelUID> getLowPriorityChannels() {
 422         return lowPriorityChannels;
 423     }
 424
 425     /**
 426      * This method gets the information for specific channel through the {@link SysteminfoInterface}. It uses the
 427      * channel ID to call the correct method from the {@link SysteminfoInterface} with deviceIndex parameter (in case of
 428      * multiple devices, for reference see {@link #getDeviceIndex(String)}})
 429      *
 430      * @param channelUID the UID of the channel
 431      * @return State object or null, if there is no information for the device with this index
 432      */
 433     private State getInfoForChannel(ChannelUID channelUID) {
 434         State state = null;
 435
 436         String channelID = channelUID.getId();
 437         int deviceIndex = getDeviceIndex(channelUID);
 438
 439         logger.trace("Getting state for channel {} with device index {}", channelID, deviceIndex);
 440
 441         // The channelGroup or channel may contain deviceIndex. It must be deleted from the channelID, because otherwise
 442         // the switch will not find the correct method below.
 443         // All digits are deleted from the ID, except for CpuLoad channels.
 444         if (!(CHANNEL_CPU_LOAD_1.equals(channelID) || CHANNEL_CPU_LOAD_5.equals(channelID)
 445                 || CHANNEL_CPU_LOAD_15.equals(channelID))) {
 446             channelID = channelID.replaceAll("\\d+", "");
 447         }
 448
 449         try {
 450             switch (channelID) {
 451                 case CHANNEL_MEMORY_HEAP_AVAILABLE:
 452                     state = new QuantityType<>(Runtime.getRuntime().freeMemory(), Units.BYTE);
 453                     break;
 454                 case CHANNEL_MEMORY_USED_HEAP_PERCENT:
 455                     state = new QuantityType<>((Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory())
 456                             * 100 / Runtime.getRuntime().maxMemory(), Units.PERCENT);
 457                     break;
 458                 case CHANNEL_DISPLAY_INFORMATION:
 459                     state = systeminfo.getDisplayInformation(deviceIndex);
 460                     break;
 461                 case CHANNEL_BATTERY_NAME:
 462                     state = systeminfo.getBatteryName(deviceIndex);
 463                     break;
 464                 case CHANNEL_BATTERY_REMAINING_CAPACITY:
 465                     state = new QuantityType<>(systeminfo.getBatteryRemainingCapacity(deviceIndex), Units.PERCENT);
 466                     break;
 467                 case CHANNEL_BATTERY_REMAINING_TIME:
 468                     state = systeminfo.getBatteryRemainingTime(deviceIndex);
 469                     break;
 470                 case CHANNEL_SENSORS_CPU_TEMPERATURE:
 471                     state = systeminfo.getSensorsCpuTemperature();
 472                     break;
 473                 case CHANNEL_SENOSRS_CPU_VOLTAGE:
 474                     state = systeminfo.getSensorsCpuVoltage();
 475                     break;
 476                 case CHANNEL_SENSORS_FAN_SPEED:
 477                     state = systeminfo.getSensorsFanSpeed(deviceIndex);
 478                     break;
 479                 case CHANNEL_CPU_LOAD:
 480                     PercentType cpuLoad = cpuLoadCache.getValue();
 481                     state = (cpuLoad != null) ? new QuantityType<>(cpuLoad, Units.PERCENT) : null;
 482                     break;
 483                 case CHANNEL_CPU_LOAD_1:
 484                     state = systeminfo.getCpuLoad1();
 485                     break;
 486                 case CHANNEL_CPU_LOAD_5:
 487                     state = systeminfo.getCpuLoad5();
 488                     break;
 489                 case CHANNEL_CPU_LOAD_15:
 490                     state = systeminfo.getCpuLoad15();
 491                     break;
 492                 case CHANNEL_CPU_UPTIME:
 493                     state = systeminfo.getCpuUptime();
 494                     break;
 495                 case CHANNEL_CPU_THREADS:
 496                     state = systeminfo.getCpuThreads();
 497                     break;
 498                 case CHANNEL_CPU_DESCRIPTION:
 499                     state = systeminfo.getCpuDescription();
 500                     break;
 501                 case CHANNEL_CPU_NAME:
 502                     state = systeminfo.getCpuName();
 503                     break;
 504                 case CHANNEL_MEMORY_AVAILABLE:
 505                     state = systeminfo.getMemoryAvailable();
 506                     break;
 507                 case CHANNEL_MEMORY_USED:
 508                     state = systeminfo.getMemoryUsed();
 509                     break;
 510                 case CHANNEL_MEMORY_TOTAL:
 511                     state = systeminfo.getMemoryTotal();
 512                     break;
 513                 case CHANNEL_MEMORY_AVAILABLE_PERCENT:
 514                     PercentType memoryAvailablePercent = systeminfo.getMemoryAvailablePercent();
 515                     state = (memoryAvailablePercent != null) ? new QuantityType<>(memoryAvailablePercent, Units.PERCENT)
 516                             : null;
 517                     break;
 518                 case CHANNEL_MEMORY_USED_PERCENT:
 519                     PercentType memoryUsedPercent = systeminfo.getMemoryUsedPercent();
 520                     state = (memoryUsedPercent != null) ? new QuantityType<>(memoryUsedPercent, Units.PERCENT) : null;
 521                     break;
 522                 case CHANNEL_SWAP_AVAILABLE:
 523                     state = systeminfo.getSwapAvailable();
 524                     break;
 525                 case CHANNEL_SWAP_USED:
 526                     state = systeminfo.getSwapUsed();
 527                     break;
 528                 case CHANNEL_SWAP_TOTAL:
 529                     state = systeminfo.getSwapTotal();
 530                     break;
 531                 case CHANNEL_SWAP_AVAILABLE_PERCENT:
 532                     PercentType swapAvailablePercent = systeminfo.getSwapAvailablePercent();
 533                     state = (swapAvailablePercent != null) ? new QuantityType<>(swapAvailablePercent, Units.PERCENT)
 534                             : null;
 535                     break;
 536                 case CHANNEL_SWAP_USED_PERCENT:
 537                     PercentType swapUsedPercent = systeminfo.getSwapUsedPercent();
 538                     state = (swapUsedPercent != null) ? new QuantityType<>(swapUsedPercent, Units.PERCENT) : null;
 539                     break;
 540                 case CHANNEL_DRIVE_MODEL:
 541                     state = systeminfo.getDriveModel(deviceIndex);
 542                     break;
 543                 case CHANNEL_DRIVE_SERIAL:
 544                     state = systeminfo.getDriveSerialNumber(deviceIndex);
 545                     break;
 546                 case CHANNEL_DRIVE_NAME:
 547                     state = systeminfo.getDriveName(deviceIndex);
 548                     break;
 549                 case CHANNEL_STORAGE_NAME:
 550                     state = systeminfo.getStorageName(deviceIndex);
 551                     break;
 552                 case CHANNEL_STORAGE_DESCRIPTION:
 553                     state = systeminfo.getStorageDescription(deviceIndex);
 554                     break;
 555                 case CHANNEL_STORAGE_AVAILABLE:
 556                     state = systeminfo.getStorageAvailable(deviceIndex);
 557                     break;
 558                 case CHANNEL_STORAGE_USED:
 559                     state = systeminfo.getStorageUsed(deviceIndex);
 560                     break;
 561                 case CHANNEL_STORAGE_TOTAL:
 562                     state = systeminfo.getStorageTotal(deviceIndex);
 563                     break;
 564                 case CHANNEL_STORAGE_TYPE:
 565                     state = systeminfo.getStorageType(deviceIndex);
 566                     break;
 567                 case CHANNEL_STORAGE_AVAILABLE_PERCENT:
 568                     PercentType storageAvailablePercent = systeminfo.getStorageAvailablePercent(deviceIndex);
 569                     state = (storageAvailablePercent != null)
 570                             ? new QuantityType<>(storageAvailablePercent, Units.PERCENT)
 571                             : null;
 572                     break;
 573                 case CHANNEL_STORAGE_USED_PERCENT:
 574                     PercentType storageUsedPercent = systeminfo.getStorageUsedPercent(deviceIndex);
 575                     state = (storageUsedPercent != null) ? new QuantityType<>(storageUsedPercent, Units.PERCENT) : null;
 576                     break;
 577                 case CHANNEL_NETWORK_IP:
 578                     state = systeminfo.getNetworkIp(deviceIndex);
 579                     break;
 580                 case CHANNEL_NETWORK_ADAPTER_NAME:
 581                     state = systeminfo.getNetworkDisplayName(deviceIndex);
 582                     break;
 583                 case CHANNEL_NETWORK_NAME:
 584                     state = systeminfo.getNetworkName(deviceIndex);
 585                     break;
 586                 case CHANNEL_NETWORK_MAC:
 587                     state = systeminfo.getNetworkMac(deviceIndex);
 588                     break;
 589                 case CHANNEL_NETWORK_DATA_SENT:
 590                     state = systeminfo.getNetworkDataSent(deviceIndex);
 591                     break;
 592                 case CHANNEL_NETWORK_DATA_RECEIVED:
 593                     state = systeminfo.getNetworkDataReceived(deviceIndex);
 594                     break;
 595                 case CHANNEL_NETWORK_PACKETS_RECEIVED:
 596                     state = systeminfo.getNetworkPacketsReceived(deviceIndex);
 597                     break;
 598                 case CHANNEL_NETWORK_PACKETS_SENT:
 599                     state = systeminfo.getNetworkPacketsSent(deviceIndex);
 600                     break;
 601                 case CHANNEL_PROCESS_LOAD:
 602                 case CHANNEL_CURRENT_PROCESS_LOAD:
 603                     DecimalType processLoad = processLoadCache.putIfAbsentAndGet(deviceIndex,
 604                             () -> getProcessCpuUsage(deviceIndex));
 605                     state = (processLoad != null) ? new QuantityType<>(processLoad, Units.PERCENT) : null;
 606                     break;
 607                 case CHANNEL_PROCESS_MEMORY:
 608                 case CHANNEL_CURRENT_PROCESS_MEMORY:
 609                     state = systeminfo.getProcessMemoryUsage(deviceIndex);
 610                     break;
 611                 case CHANNEL_PROCESS_NAME:
 612                 case CHANNEL_CURRENT_PROCESS_NAME:
 613                     state = systeminfo.getProcessName(deviceIndex);
 614                     break;
 615                 case CHANNEL_PROCESS_PATH:
 616                 case CHANNEL_CURRENT_PROCESS_PATH:
 617                     state = systeminfo.getProcessPath(deviceIndex);
 618                     break;
 619                 case CHANNEL_PROCESS_THREADS:
 620                 case CHANNEL_CURRENT_PROCESS_THREADS:
 621                     state = systeminfo.getProcessThreads(deviceIndex);
 622                     break;
 623                 default:
 624                     logger.debug("Channel with unknown ID: {} !", channelID);
 625             }
 626         } catch (DeviceNotFoundException e) {
 627             logger.warn("No information for channel {} with device index: {}", channelID, deviceIndex);
 628         } catch (Exception e) {
 629             logger.debug("Unexpected error occurred while getting system information!", e);
 630             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "@text/offline.unexpected-error");
 631         }
 632         return state != null ? state : UnDefType.UNDEF;
 633     }
 634
 635     private @Nullable PercentType getSystemCpuLoad() {
 636         return systeminfo.getSystemCpuLoad();
 637     }
 638
 639     private @Nullable DecimalType getProcessCpuUsage(int pid) {
 640         try {
 641             return systeminfo.getProcessCpuUsage(pid);
 642         } catch (DeviceNotFoundException e) {
 643             logger.warn("Process with pid {} does not exist", pid);
 644             return null;
 645         }
 646     }
 647
 648     /**
 649      * The device index is an optional part of the channelID - the last characters of the groupID. It is used to
 650      * identify unique device, when more than one devices are available (e.g. local disks with names C:\, D:\, E"\ - the
 651      * first will have deviceIndex=0, the second deviceIndex=1 ant etc).
 652      * When no device index is specified, default value of 0 (first device in the list) is returned.
 653      *
 654      * @param channelID the ID of the channel
 655      * @return natural number (number >=0)
 656      */
 657     private int getDeviceIndex(ChannelUID channelUID) {
 658         String channelID = channelUID.getId();
 659         String channelGroupID = channelUID.getGroupId();
 660         if (channelGroupID == null) {
 661             return 0;
 662         }
 663
 664         if (channelGroupID.contains(CHANNEL_GROUP_PROCESS)) {
 665             // Only in this case the deviceIndex is part of the channel configuration - PID (Process Identifier)
 666             int pid = getPID(channelUID);
 667             logger.debug("Channel with UID {} tracks process with PID: {}", channelUID, pid);
 668             return pid;
 669         }
 670
 671         if (channelGroupID.contains(CHANNEL_GROUP_CURRENT_PROCESS)) {
 672             int pid = systeminfo.getCurrentProcessID();
 673             return pid;
 674         }
 675
 676         // First try to get device index in group id, delete all non-digits from id
 677         if (Character.isDigit(channelGroupID.charAt(channelGroupID.length() - 1))) {
 678             String deviceIndexPart = channelGroupID.replaceAll("\\D+", "");
 679             return Integer.parseInt(deviceIndexPart);
 680         }
 681
 682         // If not found, try to find it in channel id, delete all non-digits from id
 683         if (Character.isDigit(channelID.charAt(channelID.length() - 1))) {
 684             String deviceIndexPart = channelID.replaceAll("\\D+", "");
 685             return Integer.parseInt(deviceIndexPart);
 686         }
 687
 688         return 0;
 689     }
 690
 691     /**
 692      * This method gets the process identifier (PID) for specific process
 693      *
 694      * @param channelUID channel unique identifier
 695      * @return natural number
 696      */
 697     private int getPID(ChannelUID channelUID) {
 698         int pid = 0;
 699         try {
 700             Channel channel = this.thing.getChannel(channelUID.getId());
 701             if (channel != null) {
 702                 Configuration channelProperties = channel.getConfiguration();
 703                 BigDecimal pidValue = (BigDecimal) channelProperties.get(PID_PARAM);
 704                 if (pidValue == null || pidValue.intValue() < 0) {
 705                     throw new IllegalArgumentException("Invalid value for Process Identifier.");
 706                 } else {
 707                     pid = pidValue.intValue();
 708                 }
 709             } else {
 710                 logger.debug("Channel does not exist! Fall back to default value.");
 711             }
 712         } catch (ClassCastException e) {
 713             logger.debug("Channel configuration cannot be read! Fall back to default value.", e);
 714         } catch (IllegalArgumentException e) {
 715             logger.debug("PID (Process Identifier) must be positive number. Fall back to default value. ", e);
 716         }
 717         return pid;
 718     }
 719
 720     @Override
 721     public void handleCommand(ChannelUID channelUID, Command command) {
 722         if (thing.getStatus().equals(ThingStatus.ONLINE)) {
 723             if (command instanceof RefreshType) {
 724                 logger.debug("Refresh command received for channel {} !", channelUID);
 725                 publishDataForChannel(channelUID);
 726             } else {
 727                 logger.debug("Unsupported command {} ! Supported commands: REFRESH", command);
 728             }
 729         } else {
 730             logger.debug("Cannot handle command. Thing is not ONLINE.");
 731         }
 732     }
 733
 734     private boolean isConfigurationKeyChanged(Configuration currentConfig, Configuration newConfig, String key) {
 735         Object currentValue = currentConfig.get(key);
 736         Object newValue = newConfig.get(key);
 737
 738         if (currentValue == null) {
 739             return (newValue != null);
 740         }
 741
 742         return !currentValue.equals(newValue);
 743     }
 744
 745     @Override
 746     public synchronized void thingUpdated(Thing thing) {
 747         logger.trace("About to update thing");
 748         boolean isChannelConfigChanged = false;
 749
 750         List<Channel> channels = thing.getChannels();
 751
 752         for (Channel channel : channels) {
 753             ChannelUID channelUID = channel.getUID();
 754             Configuration newChannelConfig = channel.getConfiguration();
 755             Channel oldChannel = this.thing.getChannel(channelUID.getId());
 756
 757             if (oldChannel == null) {
 758                 logger.warn("Channel with UID {} cannot be updated, as it cannot be found!", channelUID);
 759                 continue;
 760             }
 761             Configuration currentChannelConfig = oldChannel.getConfiguration();
 762
 763             if (isConfigurationKeyChanged(currentChannelConfig, newChannelConfig, PRIOIRITY_PARAM)) {
 764                 isChannelConfigChanged = true;
 765
 766                 handleChannelConfigurationChange(oldChannel, newChannelConfig, PRIOIRITY_PARAM);
 767
 768                 String newPriority = (String) newChannelConfig.get(PRIOIRITY_PARAM);
 769                 changeChannelPriority(channelUID, newPriority);
 770             }
 771
 772             if (isConfigurationKeyChanged(currentChannelConfig, newChannelConfig, PID_PARAM)) {
 773                 isChannelConfigChanged = true;
 774                 handleChannelConfigurationChange(oldChannel, newChannelConfig, PID_PARAM);
 775             }
 776         }
 777
 778         if (!(isInitialized() && isChannelConfigChanged)) {
 779             super.thingUpdated(thing);
 780         }
 781     }
 782
 783     private void handleChannelConfigurationChange(Channel channel, Configuration newConfig, String parameter) {
 784         Configuration configuration = channel.getConfiguration();
 785         Object oldValue = configuration.get(parameter);
 786
 787         configuration.put(parameter, newConfig.get(parameter));
 788
 789         Object newValue = newConfig.get(parameter);
 790         logger.debug("Channel with UID {} has changed its {} from {} to {}", channel.getUID(), parameter, oldValue,
 791                 newValue);
 792         publishDataForChannel(channel.getUID());
 793     }
 794
 795     @Override
 796     protected void changeThingType(ThingTypeUID thingTypeUID, Configuration configuration) {
 797         storeChannelsConfig();
 798         super.changeThingType(thingTypeUID, configuration);
 799     }
 800
 801     private void stopScheduledUpdates() {
 802         ScheduledFuture<?> localHighPriorityTasks = highPriorityTasks;
 803         if (localHighPriorityTasks != null) {
 804             logger.debug("High prioriy tasks will not be run anymore!");
 805             localHighPriorityTasks.cancel(true);
 806         }
 807
 808         ScheduledFuture<?> localMediumPriorityTasks = mediumPriorityTasks;
 809         if (localMediumPriorityTasks != null) {
 810             logger.debug("Medium prioriy tasks will not be run anymore!");
 811             localMediumPriorityTasks.cancel(true);
 812         }
 813     }
 814
 815     @Override
 816     public void dispose() {
 817         stopScheduledUpdates();
 818     }
 819 }