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   1 /**
   2  * Copyright (c) 2010-2024 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.List;
  22 import java.util.Map;
  23 import java.util.Set;
  24 import java.util.concurrent.ScheduledFuture;
  25 import java.util.concurrent.TimeUnit;
  26 import java.util.stream.Collectors;
  27
  28 import org.eclipse.jdt.annotation.NonNullByDefault;
  29 import org.eclipse.jdt.annotation.Nullable;
  30 import org.openhab.binding.systeminfo.internal.SystemInfoThingTypeProvider;
  31 import org.openhab.binding.systeminfo.internal.model.DeviceNotFoundException;
  32 import org.openhab.binding.systeminfo.internal.model.SystemInfoInterface;
  33 import org.openhab.core.cache.ExpiringCache;
  34 import org.openhab.core.cache.ExpiringCacheMap;
  35 import org.openhab.core.config.core.Configuration;
  36 import org.openhab.core.library.types.DecimalType;
  37 import org.openhab.core.library.types.PercentType;
  38 import org.openhab.core.library.types.QuantityType;
  39 import org.openhab.core.library.unit.Units;
  40 import org.openhab.core.thing.Channel;
  41 import org.openhab.core.thing.ChannelUID;
  42 import org.openhab.core.thing.Thing;
  43 import org.openhab.core.thing.ThingStatus;
  44 import org.openhab.core.thing.ThingStatusDetail;
  45 import org.openhab.core.thing.ThingTypeUID;
  46 import org.openhab.core.thing.ThingUID;
  47 import org.openhab.core.thing.binding.BaseThingHandler;
  48 import org.openhab.core.thing.binding.builder.ThingBuilder;
  49 import org.openhab.core.thing.type.ChannelGroupDefinition;
  50 import org.openhab.core.types.Command;
  51 import org.openhab.core.types.RefreshType;
  52 import org.openhab.core.types.State;
  53 import org.openhab.core.types.UnDefType;
  54 import org.slf4j.Logger;
  55 import org.slf4j.LoggerFactory;
  56
  57 /**
  58  * The {@link SystemInfoHandler} is responsible for providing real time information about the system
  59  * (CPU, Memory, Storage, Display and others).
  60  *
  61  * @author Svilen Valkanov - Initial contribution
  62  * @author Lyubomir Papzov - Separate the creation of the systeminfo object and its initialization
  63  * @author Wouter Born - Add null annotations
  64  * @author Mark Herwege - Add dynamic creation of extra channels
  65  * @author Mark Herwege - Processor frequency 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     @Override
 163     public void handleRemoval() {
 164         thingTypeProvider.removeThingType(thing.getThingTypeUID());
 165         super.handleRemoval();
 166     }
 167
 168     private boolean instantiateSystemInfoLibrary() {
 169         try {
 170             systeminfo.initializeSystemInfo();
 171             logger.debug("SystemInfo implementation is instantiated!");
 172             return true;
 173         } catch (Exception e) {
 174             logger.warn("Cannot instantiate SystemInfo object!", e);
 175             return false;
 176         }
 177     }
 178
 179     private boolean isConfigurationValid() {
 180         logger.debug("Start reading Thing configuration.");
 181         try {
 182             refreshIntervalMediumPriority = (BigDecimal) this.thing.getConfiguration()
 183                     .get(MEDIUM_PRIORITY_REFRESH_TIME);
 184             refreshIntervalHighPriority = (BigDecimal) this.thing.getConfiguration().get(HIGH_PRIORITY_REFRESH_TIME);
 185
 186             if (refreshIntervalHighPriority.intValue() <= 0 || refreshIntervalMediumPriority.intValue() <= 0) {
 187                 throw new IllegalArgumentException("Refresh time must be positive number!");
 188             }
 189             logger.debug("Refresh time for medium priority channels set to {} s", refreshIntervalMediumPriority);
 190             logger.debug("Refresh time for high priority channels set to {} s", refreshIntervalHighPriority);
 191             return true;
 192         } catch (IllegalArgumentException e) {
 193             logger.warn("Refresh time value is invalid! Please change the thing configuration!");
 194             return false;
 195         } catch (ClassCastException e) {
 196             logger.debug("Channel configuration cannot be read!");
 197             return false;
 198         }
 199     }
 200
 201     private boolean updateProperties() {
 202         Map<String, String> properties = editProperties();
 203         try {
 204             properties.put(PROPERTY_CPU_LOGICAL_CORES, systeminfo.getCpuLogicalCores().toString());
 205             properties.put(PROPERTY_CPU_PHYSICAL_CORES, systeminfo.getCpuPhysicalCores().toString());
 206             properties.put(PROPERTY_OS_FAMILY, systeminfo.getOsFamily().toString());
 207             properties.put(PROPERTY_OS_MANUFACTURER, systeminfo.getOsManufacturer().toString());
 208             properties.put(PROPERTY_OS_VERSION, systeminfo.getOsVersion().toString());
 209             updateProperties(properties);
 210             logger.debug("Properties updated!");
 211             return true;
 212         } catch (Exception e) {
 213             logger.debug("Cannot get system properties! Please try to restart the binding.", e);
 214             return false;
 215         }
 216     }
 217
 218     /**
 219      * Retrieve info on available storages, drives, displays, batteries, network interfaces and fans in the system. If
 220      * there is more than 1, create additional channel groups and channels representing each of the entities with an
 221      * index added to the channel groups and channels. The base channel groups and channels will remain without index
 222      * and are equal to the channel groups and channels with index 0. If there is only one entity in a group, do not add
 223      * a channels group and channels with index 0.
 224      * <p>
 225      * If channel groups are added, the thing type will change to systeminfo:computer-Ext, with Ext equal to the thing
 226      * id. A new handler will be created and initialization restarted. Therefore further initialization of the current
 227      * handler can be aborted if the method returns true.
 228      *
 229      * @return true if channel groups where added
 230      */
 231     private boolean addDynamicChannels() {
 232         ThingUID thingUID = thing.getUID();
 233
 234         List<ChannelGroupDefinition> newChannelGroups = new ArrayList<>();
 235         newChannelGroups.addAll(createChannelGroups(thingUID, CHANNEL_GROUP_STORAGE, CHANNEL_GROUP_TYPE_STORAGE,
 236                 systeminfo.getFileOSStoreCount()));
 237         newChannelGroups.addAll(createChannelGroups(thingUID, CHANNEL_GROUP_DRIVE, CHANNEL_GROUP_TYPE_DRIVE,
 238                 systeminfo.getDriveCount()));
 239         newChannelGroups.addAll(createChannelGroups(thingUID, CHANNEL_GROUP_DISPLAY, CHANNEL_GROUP_TYPE_DISPLAY,
 240                 systeminfo.getDisplayCount()));
 241         newChannelGroups.addAll(createChannelGroups(thingUID, CHANNEL_GROUP_BATTERY, CHANNEL_GROUP_TYPE_BATTERY,
 242                 systeminfo.getPowerSourceCount()));
 243         newChannelGroups.addAll(createChannelGroups(thingUID, CHANNEL_GROUP_NETWORK, CHANNEL_GROUP_TYPE_NETWORK,
 244                 systeminfo.getNetworkIFCount()));
 245         if (!newChannelGroups.isEmpty()) {
 246             logger.debug("Creating additional channel groups");
 247             newChannelGroups.addAll(0, thingTypeProvider.getChannelGroupDefinitions(thing.getThingTypeUID()));
 248             ThingTypeUID thingTypeUID = new ThingTypeUID(BINDING_ID, THING_TYPE_COMPUTER_ID + idExtString);
 249             if (thingTypeProvider.updateThingType(thingTypeUID, newChannelGroups)) {
 250                 logger.trace("Channel groups were added, changing the thing type");
 251                 changeThingType(thingTypeUID, thing.getConfiguration());
 252             } else {
 253                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.HANDLER_INITIALIZING_ERROR,
 254                         "@text/offline.cannot-initialize");
 255             }
 256             return true;
 257         }
 258
 259         List<Channel> newChannels = new ArrayList<>();
 260         newChannels.addAll(createChannels(thingUID, CHANNEL_SENSORS_FAN_SPEED, systeminfo.getFanCount()));
 261         newChannels.addAll(createChannels(thingUID, CHANNEL_CPU_FREQ, systeminfo.getCpuLogicalCores().intValue()));
 262         if (!newChannels.isEmpty()) {
 263             logger.debug("Creating additional channels");
 264             newChannels.addAll(0, thing.getChannels());
 265             ThingBuilder thingBuilder = editThing();
 266             thingBuilder.withChannels(newChannels);
 267             updateThing(thingBuilder.build());
 268         }
 269
 270         return false;
 271     }
 272
 273     private List<ChannelGroupDefinition> createChannelGroups(ThingUID thingUID, String channelGroupID,
 274             String channelGroupTypeID, int count) {
 275         if (count <= 1) {
 276             return Collections.emptyList();
 277         }
 278
 279         List<String> channelGroups = thingTypeProvider.getChannelGroupDefinitions(thing.getThingTypeUID()).stream()
 280                 .map(ChannelGroupDefinition::getId).collect(Collectors.toList());
 281
 282         List<ChannelGroupDefinition> newChannelGroups = new ArrayList<>();
 283         for (int i = 0; i < count; i++) {
 284             String index = String.valueOf(i);
 285             ChannelGroupDefinition channelGroupDef = thingTypeProvider
 286                     .createChannelGroupDefinitionWithIndex(channelGroupID, channelGroupTypeID, i);
 287             if (!(channelGroupDef == null || channelGroups.contains(channelGroupID + index))) {
 288                 logger.trace("Adding channel group {}", channelGroupID + index);
 289                 newChannelGroups.add(channelGroupDef);
 290             }
 291         }
 292         return newChannelGroups;
 293     }
 294
 295     private List<Channel> createChannels(ThingUID thingUID, String channelID, int count) {
 296         if (count <= 1) {
 297             return Collections.emptyList();
 298         }
 299
 300         List<Channel> newChannels = new ArrayList<>();
 301         for (int i = 0; i < count; i++) {
 302             Channel channel = thingTypeProvider.createChannelWithIndex(thing, channelID, i);
 303             if (channel != null && thing.getChannel(channel.getUID()) == null) {
 304                 logger.trace("Creating channel {}", channel.getUID().getId());
 305                 newChannels.add(channel);
 306             }
 307         }
 308         return newChannels;
 309     }
 310
 311     private void storeChannelsConfig() {
 312         logger.trace("Storing channel configurations");
 313         thingTypeProvider.storeChannelsConfig(thing);
 314     }
 315
 316     private void restoreChannelsConfig() {
 317         logger.trace("Restoring channel configurations");
 318         Map<String, Configuration> channelsConfig = thingTypeProvider.restoreChannelsConfig(thing.getUID());
 319         for (String channelId : channelsConfig.keySet()) {
 320             Channel channel = thing.getChannel(channelId);
 321             Configuration config = channelsConfig.get(channelId);
 322             if (channel != null && config != null) {
 323                 Configuration currentConfig = channel.getConfiguration();
 324                 for (String param : config.keySet()) {
 325                     if (isConfigurationKeyChanged(currentConfig, config, param)) {
 326                         handleChannelConfigurationChange(channel, config, param);
 327                     }
 328                 }
 329             }
 330         }
 331     }
 332
 333     private void groupChannelsByPriority() {
 334         logger.trace("Grouping channels by priority");
 335         List<Channel> channels = this.thing.getChannels();
 336
 337         for (Channel channel : channels) {
 338             Configuration properties = channel.getConfiguration();
 339             String priority = (String) properties.get(PRIOIRITY_PARAM);
 340             if (priority == null) {
 341                 logger.debug("Channel with UID {} will not be updated. The channel has no priority set!",
 342                         channel.getUID());
 343                 break;
 344             }
 345             switch (priority) {
 346                 case "High":
 347                     highPriorityChannels.add(channel.getUID());
 348                     break;
 349                 case "Medium":
 350                     mediumPriorityChannels.add(channel.getUID());
 351                     break;
 352                 case "Low":
 353                     lowPriorityChannels.add(channel.getUID());
 354                     break;
 355                 default:
 356                     logger.debug("Invalid priority configuration parameter. Channel will not be updated!");
 357             }
 358         }
 359     }
 360
 361     private void changeChannelPriority(ChannelUID channelUID, String priority) {
 362         switch (priority) {
 363             case "High":
 364                 mediumPriorityChannels.remove(channelUID);
 365                 lowPriorityChannels.remove(channelUID);
 366                 highPriorityChannels.add(channelUID);
 367                 break;
 368             case "Medium":
 369                 lowPriorityChannels.remove(channelUID);
 370                 highPriorityChannels.remove(channelUID);
 371                 mediumPriorityChannels.add(channelUID);
 372                 break;
 373             case "Low":
 374                 highPriorityChannels.remove(channelUID);
 375                 mediumPriorityChannels.remove(channelUID);
 376                 lowPriorityChannels.add(channelUID);
 377                 break;
 378             default:
 379                 logger.debug("Invalid priority configuration parameter. Channel will not be updated!");
 380         }
 381     }
 382
 383     private void scheduleUpdates() {
 384         logger.debug("Schedule high priority tasks at fixed rate {} s", refreshIntervalHighPriority);
 385         highPriorityTasks = scheduler.scheduleWithFixedDelay(() -> {
 386             publishData(highPriorityChannels);
 387         }, WAIT_TIME_CHANNEL_ITEM_LINK_INIT, refreshIntervalHighPriority.intValue(), TimeUnit.SECONDS);
 388
 389         logger.debug("Schedule medium priority tasks at fixed rate {} s", refreshIntervalMediumPriority);
 390         mediumPriorityTasks = scheduler.scheduleWithFixedDelay(() -> {
 391             publishData(mediumPriorityChannels);
 392         }, WAIT_TIME_CHANNEL_ITEM_LINK_INIT, refreshIntervalMediumPriority.intValue(), TimeUnit.SECONDS);
 393
 394         logger.debug("Schedule one time update for low priority tasks");
 395         scheduler.schedule(() -> {
 396             publishData(lowPriorityChannels);
 397         }, WAIT_TIME_CHANNEL_ITEM_LINK_INIT, TimeUnit.SECONDS);
 398     }
 399
 400     private void publishData(Set<ChannelUID> channels) {
 401         // if handler disposed while waiting for the links, don't update the channel states
 402         if (!ThingStatus.ONLINE.equals(thing.getStatus())) {
 403             return;
 404         }
 405         for (ChannelUID channeUID : channels) {
 406             if (isLinked(channeUID)) {
 407                 publishDataForChannel(channeUID);
 408             }
 409         }
 410     }
 411
 412     private void publishDataForChannel(ChannelUID channelUID) {
 413         State state = getInfoForChannel(channelUID);
 414         String channelID = channelUID.getId();
 415         updateState(channelID, state);
 416     }
 417
 418     public Set<ChannelUID> getHighPriorityChannels() {
 419         return highPriorityChannels;
 420     }
 421
 422     public Set<ChannelUID> getMediumPriorityChannels() {
 423         return mediumPriorityChannels;
 424     }
 425
 426     public Set<ChannelUID> getLowPriorityChannels() {
 427         return lowPriorityChannels;
 428     }
 429
 430     /**
 431      * This method gets the information for specific channel through the {@link SystemInfoInterface}. It uses the
 432      * channel ID to call the correct method from the {@link SystemInfoInterface} with deviceIndex parameter (in case of
 433      * multiple devices, for reference see {@link SystemInfoHandler#getDeviceIndex(ChannelUID)}})
 434      *
 435      * @param channelUID the UID of the channel
 436      * @return State object or null, if there is no information for the device with this index
 437      */
 438     private State getInfoForChannel(ChannelUID channelUID) {
 439         State state = null;
 440
 441         String channelID = channelUID.getId();
 442         int deviceIndex = getDeviceIndex(channelUID);
 443
 444         logger.trace("Getting state for channel {} with device index {}", channelID, deviceIndex);
 445
 446         // The channelGroup or channel may contain deviceIndex. It must be deleted from the channelID, because otherwise
 447         // the switch will not find the correct method below.
 448         // All digits are deleted from the ID, except for CpuLoad channels.
 449         if (!(CHANNEL_CPU_LOAD_1.equals(channelID) || CHANNEL_CPU_LOAD_5.equals(channelID)
 450                 || CHANNEL_CPU_LOAD_15.equals(channelID))) {
 451             channelID = channelID.replaceAll("\\d+", "");
 452         }
 453
 454         try {
 455             switch (channelID) {
 456                 case CHANNEL_MEMORY_HEAP_AVAILABLE:
 457                     state = new QuantityType<>(Runtime.getRuntime().freeMemory(), Units.BYTE);
 458                     break;
 459                 case CHANNEL_MEMORY_USED_HEAP_PERCENT:
 460                     state = new QuantityType<>((Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory())
 461                             * 100 / Runtime.getRuntime().maxMemory(), Units.PERCENT);
 462                     break;
 463                 case CHANNEL_DISPLAY_INFORMATION:
 464                     state = systeminfo.getDisplayInformation(deviceIndex);
 465                     break;
 466                 case CHANNEL_BATTERY_NAME:
 467                     state = systeminfo.getBatteryName(deviceIndex);
 468                     break;
 469                 case CHANNEL_BATTERY_REMAINING_CAPACITY:
 470                     state = new QuantityType<>(systeminfo.getBatteryRemainingCapacity(deviceIndex), Units.PERCENT);
 471                     break;
 472                 case CHANNEL_BATTERY_REMAINING_TIME:
 473                     state = systeminfo.getBatteryRemainingTime(deviceIndex);
 474                     break;
 475                 case CHANNEL_SENSORS_CPU_TEMPERATURE:
 476                     state = systeminfo.getSensorsCpuTemperature();
 477                     break;
 478                 case CHANNEL_SENOSRS_CPU_VOLTAGE:
 479                     state = systeminfo.getSensorsCpuVoltage();
 480                     break;
 481                 case CHANNEL_SENSORS_FAN_SPEED:
 482                     state = systeminfo.getSensorsFanSpeed(deviceIndex);
 483                     break;
 484                 case CHANNEL_CPU_MAXFREQ:
 485                     state = systeminfo.getCpuMaxFreq();
 486                     break;
 487                 case CHANNEL_CPU_FREQ:
 488                     state = systeminfo.getCpuFreq(deviceIndex);
 489                     break;
 490                 case CHANNEL_CPU_LOAD:
 491                     PercentType cpuLoad = cpuLoadCache.getValue();
 492                     state = (cpuLoad != null) ? new QuantityType<>(cpuLoad, Units.PERCENT) : null;
 493                     break;
 494                 case CHANNEL_CPU_LOAD_1:
 495                     state = systeminfo.getCpuLoad1();
 496                     break;
 497                 case CHANNEL_CPU_LOAD_5:
 498                     state = systeminfo.getCpuLoad5();
 499                     break;
 500                 case CHANNEL_CPU_LOAD_15:
 501                     state = systeminfo.getCpuLoad15();
 502                     break;
 503                 case CHANNEL_CPU_UPTIME:
 504                     state = systeminfo.getCpuUptime();
 505                     break;
 506                 case CHANNEL_CPU_THREADS:
 507                     state = systeminfo.getCpuThreads();
 508                     break;
 509                 case CHANNEL_CPU_DESCRIPTION:
 510                     state = systeminfo.getCpuDescription();
 511                     break;
 512                 case CHANNEL_CPU_NAME:
 513                     state = systeminfo.getCpuName();
 514                     break;
 515                 case CHANNEL_MEMORY_AVAILABLE:
 516                     state = systeminfo.getMemoryAvailable();
 517                     break;
 518                 case CHANNEL_MEMORY_USED:
 519                     state = systeminfo.getMemoryUsed();
 520                     break;
 521                 case CHANNEL_MEMORY_TOTAL:
 522                     state = systeminfo.getMemoryTotal();
 523                     break;
 524                 case CHANNEL_MEMORY_AVAILABLE_PERCENT:
 525                     PercentType memoryAvailablePercent = systeminfo.getMemoryAvailablePercent();
 526                     state = (memoryAvailablePercent != null) ? new QuantityType<>(memoryAvailablePercent, Units.PERCENT)
 527                             : null;
 528                     break;
 529                 case CHANNEL_MEMORY_USED_PERCENT:
 530                     PercentType memoryUsedPercent = systeminfo.getMemoryUsedPercent();
 531                     state = (memoryUsedPercent != null) ? new QuantityType<>(memoryUsedPercent, Units.PERCENT) : null;
 532                     break;
 533                 case CHANNEL_SWAP_AVAILABLE:
 534                     state = systeminfo.getSwapAvailable();
 535                     break;
 536                 case CHANNEL_SWAP_USED:
 537                     state = systeminfo.getSwapUsed();
 538                     break;
 539                 case CHANNEL_SWAP_TOTAL:
 540                     state = systeminfo.getSwapTotal();
 541                     break;
 542                 case CHANNEL_SWAP_AVAILABLE_PERCENT:
 543                     PercentType swapAvailablePercent = systeminfo.getSwapAvailablePercent();
 544                     state = (swapAvailablePercent != null) ? new QuantityType<>(swapAvailablePercent, Units.PERCENT)
 545                             : null;
 546                     break;
 547                 case CHANNEL_SWAP_USED_PERCENT:
 548                     PercentType swapUsedPercent = systeminfo.getSwapUsedPercent();
 549                     state = (swapUsedPercent != null) ? new QuantityType<>(swapUsedPercent, Units.PERCENT) : null;
 550                     break;
 551                 case CHANNEL_DRIVE_MODEL:
 552                     state = systeminfo.getDriveModel(deviceIndex);
 553                     break;
 554                 case CHANNEL_DRIVE_SERIAL:
 555                     state = systeminfo.getDriveSerialNumber(deviceIndex);
 556                     break;
 557                 case CHANNEL_DRIVE_NAME:
 558                     state = systeminfo.getDriveName(deviceIndex);
 559                     break;
 560                 case CHANNEL_STORAGE_NAME:
 561                     state = systeminfo.getStorageName(deviceIndex);
 562                     break;
 563                 case CHANNEL_STORAGE_DESCRIPTION:
 564                     state = systeminfo.getStorageDescription(deviceIndex);
 565                     break;
 566                 case CHANNEL_STORAGE_AVAILABLE:
 567                     state = systeminfo.getStorageAvailable(deviceIndex);
 568                     break;
 569                 case CHANNEL_STORAGE_USED:
 570                     state = systeminfo.getStorageUsed(deviceIndex);
 571                     break;
 572                 case CHANNEL_STORAGE_TOTAL:
 573                     state = systeminfo.getStorageTotal(deviceIndex);
 574                     break;
 575                 case CHANNEL_STORAGE_TYPE:
 576                     state = systeminfo.getStorageType(deviceIndex);
 577                     break;
 578                 case CHANNEL_STORAGE_AVAILABLE_PERCENT:
 579                     PercentType storageAvailablePercent = systeminfo.getStorageAvailablePercent(deviceIndex);
 580                     state = (storageAvailablePercent != null)
 581                             ? new QuantityType<>(storageAvailablePercent, Units.PERCENT)
 582                             : null;
 583                     break;
 584                 case CHANNEL_STORAGE_USED_PERCENT:
 585                     PercentType storageUsedPercent = systeminfo.getStorageUsedPercent(deviceIndex);
 586                     state = (storageUsedPercent != null) ? new QuantityType<>(storageUsedPercent, Units.PERCENT) : null;
 587                     break;
 588                 case CHANNEL_NETWORK_IP:
 589                     state = systeminfo.getNetworkIp(deviceIndex);
 590                     break;
 591                 case CHANNEL_NETWORK_ADAPTER_NAME:
 592                     state = systeminfo.getNetworkDisplayName(deviceIndex);
 593                     break;
 594                 case CHANNEL_NETWORK_NAME:
 595                     state = systeminfo.getNetworkName(deviceIndex);
 596                     break;
 597                 case CHANNEL_NETWORK_MAC:
 598                     state = systeminfo.getNetworkMac(deviceIndex);
 599                     break;
 600                 case CHANNEL_NETWORK_DATA_SENT:
 601                     state = systeminfo.getNetworkDataSent(deviceIndex);
 602                     break;
 603                 case CHANNEL_NETWORK_DATA_RECEIVED:
 604                     state = systeminfo.getNetworkDataReceived(deviceIndex);
 605                     break;
 606                 case CHANNEL_NETWORK_PACKETS_RECEIVED:
 607                     state = systeminfo.getNetworkPacketsReceived(deviceIndex);
 608                     break;
 609                 case CHANNEL_NETWORK_PACKETS_SENT:
 610                     state = systeminfo.getNetworkPacketsSent(deviceIndex);
 611                     break;
 612                 case CHANNEL_PROCESS_LOAD:
 613                 case CHANNEL_CURRENT_PROCESS_LOAD:
 614                     DecimalType processLoad = processLoadCache.putIfAbsentAndGet(deviceIndex,
 615                             () -> getProcessCpuUsage(deviceIndex));
 616                     state = (processLoad != null) ? new QuantityType<>(processLoad, Units.PERCENT) : null;
 617                     break;
 618                 case CHANNEL_PROCESS_MEMORY:
 619                 case CHANNEL_CURRENT_PROCESS_MEMORY:
 620                     state = systeminfo.getProcessMemoryUsage(deviceIndex);
 621                     break;
 622                 case CHANNEL_PROCESS_NAME:
 623                 case CHANNEL_CURRENT_PROCESS_NAME:
 624                     state = systeminfo.getProcessName(deviceIndex);
 625                     break;
 626                 case CHANNEL_PROCESS_PATH:
 627                 case CHANNEL_CURRENT_PROCESS_PATH:
 628                     state = systeminfo.getProcessPath(deviceIndex);
 629                     break;
 630                 case CHANNEL_PROCESS_THREADS:
 631                 case CHANNEL_CURRENT_PROCESS_THREADS:
 632                     state = systeminfo.getProcessThreads(deviceIndex);
 633                     break;
 634                 default:
 635                     logger.debug("Channel with unknown ID: {} !", channelID);
 636             }
 637         } catch (DeviceNotFoundException e) {
 638             logger.warn("No information for channel {} with device index: {}", channelID, deviceIndex);
 639         } catch (Exception e) {
 640             logger.debug("Unexpected error occurred while getting system information!", e);
 641             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "@text/offline.unexpected-error");
 642         }
 643         return state != null ? state : UnDefType.UNDEF;
 644     }
 645
 646     private @Nullable PercentType getSystemCpuLoad() {
 647         return systeminfo.getSystemCpuLoad();
 648     }
 649
 650     private @Nullable DecimalType getProcessCpuUsage(int pid) {
 651         try {
 652             return systeminfo.getProcessCpuUsage(pid);
 653         } catch (DeviceNotFoundException e) {
 654             logger.warn("Process with pid {} does not exist", pid);
 655             return null;
 656         }
 657     }
 658
 659     /**
 660      * The device index is an optional part of the channelID - the last characters of the groupID. It is used to
 661      * identify unique device, when more than one devices are available (e.g. local disks with names C:\, D:\, E"\ - the
 662      * first will have deviceIndex=0, the second deviceIndex=1 ant etc).
 663      * When no device index is specified, default value of 0 (first device in the list) is returned.
 664      *
 665      * @param channelUID the ID of the channel
 666      * @return natural number (number >=0)
 667      */
 668     private int getDeviceIndex(ChannelUID channelUID) {
 669         String channelID = channelUID.getId();
 670         String channelGroupID = channelUID.getGroupId();
 671         if (channelGroupID == null) {
 672             return 0;
 673         }
 674
 675         if (channelGroupID.contains(CHANNEL_GROUP_PROCESS)) {
 676             // Only in this case the deviceIndex is part of the channel configuration - PID (Process Identifier)
 677             int pid = getPID(channelUID);
 678             logger.debug("Channel with UID {} tracks process with PID: {}", channelUID, pid);
 679             return pid;
 680         }
 681
 682         if (channelGroupID.contains(CHANNEL_GROUP_CURRENT_PROCESS)) {
 683             return systeminfo.getCurrentProcessID();
 684         }
 685
 686         // First try to get device index in group id, delete all non-digits from id
 687         if (Character.isDigit(channelGroupID.charAt(channelGroupID.length() - 1))) {
 688             String deviceIndexPart = channelGroupID.replaceAll("\\D+", "");
 689             return Integer.parseInt(deviceIndexPart);
 690         }
 691
 692         // If not found, try to find it in channel id, delete all non-digits from id
 693         if (Character.isDigit(channelID.charAt(channelID.length() - 1))) {
 694             String deviceIndexPart = channelID.replaceAll("\\D+", "");
 695             return Integer.parseInt(deviceIndexPart);
 696         }
 697
 698         return 0;
 699     }
 700
 701     /**
 702      * This method gets the process identifier (PID) for specific process
 703      *
 704      * @param channelUID channel unique identifier
 705      * @return natural number
 706      */
 707     private int getPID(ChannelUID channelUID) {
 708         int pid = 0;
 709         try {
 710             Channel channel = this.thing.getChannel(channelUID.getId());
 711             if (channel != null) {
 712                 Configuration channelProperties = channel.getConfiguration();
 713                 BigDecimal pidValue = (BigDecimal) channelProperties.get(PID_PARAM);
 714                 if (pidValue == null || pidValue.intValue() < 0) {
 715                     throw new IllegalArgumentException("Invalid value for Process Identifier.");
 716                 } else {
 717                     pid = pidValue.intValue();
 718                 }
 719             } else {
 720                 logger.debug("Channel does not exist! Fall back to default value.");
 721             }
 722         } catch (ClassCastException e) {
 723             logger.debug("Channel configuration cannot be read! Fall back to default value.", e);
 724         } catch (IllegalArgumentException e) {
 725             logger.debug("PID (Process Identifier) must be positive number. Fall back to default value. ", e);
 726         }
 727         return pid;
 728     }
 729
 730     @Override
 731     public void handleCommand(ChannelUID channelUID, Command command) {
 732         if (thing.getStatus().equals(ThingStatus.ONLINE)) {
 733             if (command instanceof RefreshType) {
 734                 logger.debug("Refresh command received for channel {} !", channelUID);
 735                 publishDataForChannel(channelUID);
 736             } else {
 737                 logger.debug("Unsupported command {} ! Supported commands: REFRESH", command);
 738             }
 739         } else {
 740             logger.debug("Cannot handle command. Thing is not ONLINE.");
 741         }
 742     }
 743
 744     private boolean isConfigurationKeyChanged(Configuration currentConfig, Configuration newConfig, String key) {
 745         Object currentValue = currentConfig.get(key);
 746         Object newValue = newConfig.get(key);
 747
 748         if (currentValue == null) {
 749             return (newValue != null);
 750         }
 751
 752         return !currentValue.equals(newValue);
 753     }
 754
 755     @Override
 756     public synchronized void thingUpdated(Thing thing) {
 757         logger.trace("About to update thing");
 758         boolean isChannelConfigChanged = false;
 759
 760         List<Channel> channels = thing.getChannels();
 761
 762         for (Channel channel : channels) {
 763             ChannelUID channelUID = channel.getUID();
 764             Configuration newChannelConfig = channel.getConfiguration();
 765             Channel oldChannel = this.thing.getChannel(channelUID.getId());
 766
 767             if (oldChannel == null) {
 768                 logger.warn("Channel with UID {} cannot be updated, as it cannot be found!", channelUID);
 769                 continue;
 770             }
 771             Configuration currentChannelConfig = oldChannel.getConfiguration();
 772
 773             if (isConfigurationKeyChanged(currentChannelConfig, newChannelConfig, PRIOIRITY_PARAM)) {
 774                 isChannelConfigChanged = true;
 775
 776                 handleChannelConfigurationChange(oldChannel, newChannelConfig, PRIOIRITY_PARAM);
 777
 778                 String newPriority = (String) newChannelConfig.get(PRIOIRITY_PARAM);
 779                 changeChannelPriority(channelUID, newPriority);
 780             }
 781
 782             if (isConfigurationKeyChanged(currentChannelConfig, newChannelConfig, PID_PARAM)) {
 783                 isChannelConfigChanged = true;
 784                 handleChannelConfigurationChange(oldChannel, newChannelConfig, PID_PARAM);
 785             }
 786         }
 787
 788         if (!(isInitialized() && isChannelConfigChanged)) {
 789             super.thingUpdated(thing);
 790         }
 791     }
 792
 793     private void handleChannelConfigurationChange(Channel channel, Configuration newConfig, String parameter) {
 794         Configuration configuration = channel.getConfiguration();
 795         Object oldValue = configuration.get(parameter);
 796
 797         configuration.put(parameter, newConfig.get(parameter));
 798
 799         Object newValue = newConfig.get(parameter);
 800         logger.debug("Channel with UID {} has changed its {} from {} to {}", channel.getUID(), parameter, oldValue,
 801                 newValue);
 802         publishDataForChannel(channel.getUID());
 803     }
 804
 805     @Override
 806     protected void changeThingType(ThingTypeUID thingTypeUID, Configuration configuration) {
 807         storeChannelsConfig();
 808         super.changeThingType(thingTypeUID, configuration);
 809     }
 810
 811     private void stopScheduledUpdates() {
 812         ScheduledFuture<?> localHighPriorityTasks = highPriorityTasks;
 813         if (localHighPriorityTasks != null) {
 814             logger.debug("High prioriy tasks will not be run anymore!");
 815             localHighPriorityTasks.cancel(true);
 816         }
 817
 818         ScheduledFuture<?> localMediumPriorityTasks = mediumPriorityTasks;
 819         if (localMediumPriorityTasks != null) {
 820             logger.debug("Medium prioriy tasks will not be run anymore!");
 821             localMediumPriorityTasks.cancel(true);
 822         }
 823     }
 824
 825     @Override
 826     public void dispose() {
 827         stopScheduledUpdates();
 828     }
 829 }