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source: branches/2520_PersistenceReintegration/HeuristicLab.Clients.Hive/3.3/RefreshableJob.cs @ 16955

Last change on this file since 16955 was 16453, checked in by jkarder, 6 years ago

#2520: updated year of copyrights

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1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2019 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Collections.Generic;
24using System.ComponentModel;
25using System.Drawing;
26using System.Linq;
27using HeuristicLab.Collections;
28using HeuristicLab.Common;
29using HeuristicLab.Core;
30using HeuristicLab.MainForm;
31
32namespace HeuristicLab.Clients.Hive {
33  public class RefreshableJob : IHiveItem, IDeepCloneable, IContent, IComparable<RefreshableJob>, IDisposable {
34    private JobResultPoller jobResultPoller;
35    private ConcurrentTaskDownloader<ItemTask> jobDownloader;
36    private object locker = new object();
37    private object downloadFinishedLocker = new object();
38    object jobResultReceivedLocker = new object();
39
40    public bool IsProgressing { get; set; }
41
42    private Job job;
43    public Job Job {
44      get { return job; }
45      set {
46        if (value != job) {
47          if (value == null)
48            throw new ArgumentNullException();
49
50          if (job != null) DeregisterJobEvents();
51          job = value;
52          if (job != null) {
53            RegisterJobEvents();
54            job_PropertyChanged(job, new PropertyChangedEventArgs("Id"));
55          }
56          OnJobChanged();
57          OnToStringChanged(this, EventArgs.Empty);
58          job_ItemImageChanged(this, EventArgs.Empty);
59        }
60      }
61    }
62
63    private ItemCollection<HiveTask> hiveTasks;
64    public ItemCollection<HiveTask> HiveTasks {
65      get { return hiveTasks; }
66      set {
67        if (hiveTasks != value) {
68          if (hiveTasks != null) DeregisterHiveTasksEvents();
69          hiveTasks = value;
70          if (hiveTasks != null) RegisterHiveTasksEvents();
71          OnHiveTasksChanged();
72        }
73      }
74    }
75
76    private ExecutionState executionState;
77    public ExecutionState ExecutionState {
78      get { return executionState; }
79      internal set {
80        if (executionState != value) {
81          executionState = value;
82          OnExecutionStateChanged();
83        }
84      }
85    }
86
87    private TimeSpan executionTime;
88    public TimeSpan ExecutionTime {
89      get { return executionTime; }
90      internal set {
91        if (executionTime != value) {
92          executionTime = value;
93          OnExecutionTimeChanged();
94        }
95      }
96    }
97
98    private bool refreshAutomatically;
99    public bool RefreshAutomatically {
100      get { return refreshAutomatically; }
101      set {
102        lock (locker) {
103          if (refreshAutomatically != value) {
104            refreshAutomatically = value;
105            OnRefreshAutomaticallyChanged();
106          }
107          if (RefreshAutomatically) {
108            if (this.HiveTasks != null && this.HiveTasks.Count > 0 && (jobResultPoller == null || !jobResultPoller.IsPolling)) {
109              StartResultPolling();
110            }
111          } else {
112            PauseResultPolling();
113          }
114        }
115      }
116    }
117
118    // indicates if download button is enabled
119    private bool isDownloadable = true;
120    public bool IsDownloadable {
121      get { return isDownloadable; }
122      set {
123        if (value != isDownloadable) {
124          isDownloadable = value;
125          OnIsDownloadableChanged();
126        }
127      }
128    }
129
130    // if true, all control buttons should be enabled. otherwise disabled
131    private bool isControllable = true;
132    public bool IsControllable {
133      get { return isControllable; }
134      private set {
135        if (value != isControllable) {
136          isControllable = value;
137          OnIsControllableChanged();
138          if (this.hiveTasks != null) {
139            foreach (var hiveJob in this.hiveTasks) {
140              hiveJob.IsControllable = value;
141            }
142          }
143        }
144      }
145    }
146
147    // indicates if a user is allowed to share this experiment
148    private bool isSharable = true;
149    public bool IsSharable {
150      get { return isSharable; }
151      private set {
152        if (value != isSharable) {
153          isSharable = value;
154          OnIsSharableChanged();
155        }
156      }
157    }
158
159    private IProgress progress;
160    public IProgress Progress {
161      get { return progress; }
162      set {
163        this.progress = value;
164        OnIsProgressingChanged();
165      }
166    }
167
168
169    private ThreadSafeLog log;
170    public ILog Log {
171      get { return log; }
172    }
173
174    public StateLogListList StateLogList {
175      get { return new StateLogListList(this.GetAllHiveTasks().Select(x => x.StateLog)); }
176    }
177
178    #region Constructors and Cloning
179    public RefreshableJob() {
180      this.progress = new Progress();
181      this.refreshAutomatically = false;
182      this.Job = new Job();
183      this.log = new ThreadSafeLog();
184      this.jobDownloader = new ConcurrentTaskDownloader<ItemTask>(Settings.Default.MaxParallelDownloads, Settings.Default.MaxParallelDownloads);
185      this.jobDownloader.ExceptionOccured += new EventHandler<EventArgs<Exception>>(jobDownloader_ExceptionOccured);
186      this.HiveTasks = new ItemCollection<HiveTask>();
187    }
188    public RefreshableJob(Job hiveJob) {
189      this.progress = new Progress();
190      this.refreshAutomatically = true;
191      this.Job = hiveJob;
192      this.log = new ThreadSafeLog();
193      this.jobDownloader = new ConcurrentTaskDownloader<ItemTask>(Settings.Default.MaxParallelDownloads, Settings.Default.MaxParallelDownloads);
194      this.jobDownloader.ExceptionOccured += new EventHandler<EventArgs<Exception>>(jobDownloader_ExceptionOccured);
195      this.HiveTasks = new ItemCollection<HiveTask>();
196    }
197    protected RefreshableJob(RefreshableJob original, Cloner cloner) {
198      cloner.RegisterClonedObject(original, this);
199      this.Job = cloner.Clone(original.Job);
200      this.IsControllable = original.IsControllable;
201      this.log = cloner.Clone(original.log);
202      this.RefreshAutomatically = false; // do not start results polling automatically
203      this.jobDownloader = new ConcurrentTaskDownloader<ItemTask>(Settings.Default.MaxParallelDownloads, Settings.Default.MaxParallelDownloads);
204      this.jobDownloader.ExceptionOccured += new EventHandler<EventArgs<Exception>>(jobDownloader_ExceptionOccured);
205      this.HiveTasks = cloner.Clone(original.HiveTasks);
206      this.ExecutionTime = original.ExecutionTime;
207      this.ExecutionState = original.ExecutionState;
208    }
209    public IDeepCloneable Clone(Cloner cloner) {
210      return new RefreshableJob(this, cloner);
211    }
212    public object Clone() {
213      return this.Clone(new Cloner());
214    }
215    #endregion
216
217    #region JobResultPoller Events
218    public void StartResultPolling() {
219      if (jobResultPoller == null) {
220        jobResultPoller = new JobResultPoller(job.Id, Settings.Default.ResultPollingInterval);
221        RegisterResultPollingEvents();
222        jobResultPoller.AutoResumeOnException = false;
223      }
224
225      if (!jobResultPoller.IsPolling) {
226        jobResultPoller.Start();
227      }
228    }
229
230    public void StopResultPolling() {
231      if (jobResultPoller != null && jobResultPoller.IsPolling) {
232        refreshAutomatically = false;
233        jobResultPoller.Stop();
234        DeregisterResultPollingEvents();
235        jobResultPoller = null;
236      }
237    }
238
239    public void PauseResultPolling() {
240      if (jobResultPoller != null && jobResultPoller.IsPolling) {
241        jobResultPoller.Stop();
242      }
243    }
244
245    private void RegisterResultPollingEvents() {
246      jobResultPoller.ExceptionOccured += new EventHandler<EventArgs<Exception>>(jobResultPoller_ExceptionOccured);
247      jobResultPoller.JobResultsReceived += new EventHandler<EventArgs<IEnumerable<LightweightTask>>>(jobResultPoller_JobResultReceived);
248      jobResultPoller.IsPollingChanged += new EventHandler(jobResultPoller_IsPollingChanged);
249    }
250    private void DeregisterResultPollingEvents() {
251      jobResultPoller.ExceptionOccured -= new EventHandler<EventArgs<Exception>>(jobResultPoller_ExceptionOccured);
252      jobResultPoller.JobResultsReceived -= new EventHandler<EventArgs<IEnumerable<LightweightTask>>>(jobResultPoller_JobResultReceived);
253      jobResultPoller.IsPollingChanged -= new EventHandler(jobResultPoller_IsPollingChanged);
254    }
255    private void jobResultPoller_IsPollingChanged(object sender, EventArgs e) {
256      if (this.refreshAutomatically != jobResultPoller.IsPolling) {
257        this.refreshAutomatically = jobResultPoller.IsPolling;
258        OnRefreshAutomaticallyChanged();
259      }
260    }
261
262    private void jobResultPoller_JobResultReceived(object sender, EventArgs<IEnumerable<LightweightTask>> e) {
263      lock (jobResultReceivedLocker) {
264        foreach (LightweightTask lightweightTask in e.Value) {
265          HiveTask hiveTask = GetHiveTaskById(lightweightTask.Id);
266          if (hiveTask != null) {
267            // lastJobDataUpdate equals DateTime.MinValue right after it was uploaded. When the first results are polled, this value is updated
268            if (hiveTask.Task.State == TaskState.Offline && lightweightTask.State == TaskState.Waiting) {
269              hiveTask.Task.LastTaskDataUpdate = lightweightTask.LastTaskDataUpdate;
270            }
271
272            hiveTask.UpdateFromLightweightJob(lightweightTask);
273
274            if (!hiveTask.IsFinishedTaskDownloaded && !hiveTask.IsDownloading && hiveTask.Task.LastTaskDataUpdate < lightweightTask.LastTaskDataUpdate && (lightweightTask.State == TaskState.Finished || lightweightTask.State == TaskState.Aborted || lightweightTask.State == TaskState.Failed || lightweightTask.State == TaskState.Paused)) {
275              log.LogMessage(string.Format("Downloading task {0}", lightweightTask.Id));
276              hiveTask.IsDownloading = true;
277              jobDownloader.DownloadTaskData(hiveTask.Task, (localJob, itemJob) => {
278                lock (downloadFinishedLocker) {
279                  log.LogMessage(string.Format("Finished downloading task {0}", localJob.Id));
280                  HiveTask localHiveTask = GetHiveTaskById(localJob.Id);
281
282                  if (itemJob == null) {
283                    // something bad happened to this task. bad task, BAAAD task!
284                    localHiveTask.IsDownloading = false;
285                  } else {
286                    // if the task is paused, download but don't integrate into parent optimizer (to avoid Prepare)
287                    if (localJob.State == TaskState.Paused) {
288                      localHiveTask.ItemTask = itemJob;
289                    } else {
290                      if (localJob.ParentTaskId.HasValue) {
291                        HiveTask parentHiveTask = GetHiveTaskById(localJob.ParentTaskId.Value);
292                        parentHiveTask.IntegrateChild(itemJob, localJob.Id);
293                      } else {
294                        localHiveTask.ItemTask = itemJob;
295                      }
296                    }
297                    localHiveTask.IsDownloading = false;
298                    localHiveTask.Task.LastTaskDataUpdate = lightweightTask.LastTaskDataUpdate;
299                  }
300                }
301              });
302            }
303          }
304        }
305        GC.Collect(); // force GC, because .NET is too lazy here (deserialization takes a lot of memory)
306        if (IsFinished()) {
307          ExecutionState = ExecutionState.Stopped;
308          StopResultPolling();
309        } else if (IsPaused()) {
310          ExecutionState = ExecutionState.Paused;
311          StopResultPolling();
312        } else {
313          ExecutionState = ExecutionState.Started;
314        }
315        UpdateTotalExecutionTime();
316        UpdateStatistics();
317        OnStateLogListChanged();
318        OnTaskReceived();
319      }
320    }
321
322    public HiveTask GetHiveTaskById(Guid jobId) {
323      foreach (HiveTask t in this.HiveTasks) {
324        var hj = t.GetHiveTaskByTaskId(jobId);
325        if (hj != null)
326          return hj;
327      }
328      return null;
329    }
330
331    private void UpdateStatistics() {
332      var jobs = this.GetAllHiveTasks();
333      job.JobCount = jobs.Count();
334      job.CalculatingCount = jobs.Count(j => j.Task.State == TaskState.Calculating);
335      job.FinishedCount = jobs.Count(j => j.Task.State == TaskState.Finished);
336      OnJobStatisticsChanged();
337    }
338
339    private void jobResultPoller_ExceptionOccured(object sender, EventArgs<Exception> e) {
340      OnExceptionOccured(sender, e.Value);
341    }
342    private void jobDownloader_ExceptionOccured(object sender, EventArgs<Exception> e) {
343      OnExceptionOccured(sender, e.Value);
344    }
345    public void UpdateTotalExecutionTime() {
346      this.ExecutionTime = TimeSpan.FromMilliseconds(this.GetAllHiveTasks().Sum(x => x.Task.ExecutionTime.TotalMilliseconds));
347    }
348    #endregion
349
350    #region Job Events
351    private void RegisterJobEvents() {
352      job.ToStringChanged += new EventHandler(OnToStringChanged);
353      job.PropertyChanged += new PropertyChangedEventHandler(job_PropertyChanged);
354      job.ItemImageChanged += new EventHandler(job_ItemImageChanged);
355      job.ModifiedChanged += new EventHandler(job_ModifiedChanged);
356    }
357
358    private void DeregisterJobEvents() {
359      job.ToStringChanged -= new EventHandler(OnToStringChanged);
360      job.PropertyChanged -= new PropertyChangedEventHandler(job_PropertyChanged);
361      job.ItemImageChanged -= new EventHandler(job_ItemImageChanged);
362      job.ModifiedChanged -= new EventHandler(job_ModifiedChanged);
363    }
364    #endregion
365
366    #region Event Handler
367    public event EventHandler RefreshAutomaticallyChanged;
368    private void OnRefreshAutomaticallyChanged() {
369      var handler = RefreshAutomaticallyChanged;
370      if (handler != null) handler(this, EventArgs.Empty);
371    }
372
373    public event EventHandler JobChanged;
374    private void OnJobChanged() {
375      var handler = JobChanged;
376      if (handler != null) handler(this, EventArgs.Empty);
377    }
378
379    public event EventHandler ModifiedChanged;
380    private void job_ModifiedChanged(object sender, EventArgs e) {
381      var handler = ModifiedChanged;
382      if (handler != null) handler(sender, e);
383    }
384
385    public event EventHandler ItemImageChanged;
386    private void job_ItemImageChanged(object sender, EventArgs e) {
387      var handler = ItemImageChanged;
388      if (handler != null) handler(this, e);
389    }
390
391    public event PropertyChangedEventHandler PropertyChanged;
392    private void job_PropertyChanged(object sender, PropertyChangedEventArgs e) {
393      this.IsSharable = job.Permission == Permission.Full;
394      this.IsControllable = job.Permission == Permission.Full;
395
396      var handler = PropertyChanged;
397      if (handler != null) handler(sender, e);
398    }
399
400    public event EventHandler ToStringChanged;
401    private void OnToStringChanged(object sender, EventArgs e) {
402      var handler = ToStringChanged;
403      if (handler != null) handler(this, e);
404    }
405
406    public event EventHandler IsDownloadableChanged;
407    private void OnIsDownloadableChanged() {
408      var handler = IsDownloadableChanged;
409      if (handler != null) handler(this, EventArgs.Empty);
410    }
411
412    public event EventHandler IsControllableChanged;
413    private void OnIsControllableChanged() {
414      var handler = IsControllableChanged;
415      if (handler != null) handler(this, EventArgs.Empty);
416    }
417
418    public event EventHandler IsSharableChanged;
419    private void OnIsSharableChanged() {
420      var handler = IsSharableChanged;
421      if (handler != null) handler(this, EventArgs.Empty);
422    }
423
424    public event EventHandler JobStatisticsChanged;
425    private void OnJobStatisticsChanged() {
426      var handler = JobStatisticsChanged;
427      if (handler != null) handler(this, EventArgs.Empty);
428    }
429
430    public event EventHandler<EventArgs<Exception>> ExceptionOccured;
431    private void OnExceptionOccured(object sender, Exception exception) {
432      log.LogException(exception);
433      var handler = ExceptionOccured;
434      if (handler != null) handler(sender, new EventArgs<Exception>(exception));
435    }
436
437    public event EventHandler StateLogListChanged;
438    private void OnStateLogListChanged() {
439      var handler = StateLogListChanged;
440      if (handler != null) handler(this, EventArgs.Empty);
441    }
442
443    public event EventHandler ExecutionTimeChanged;
444    protected virtual void OnExecutionTimeChanged() {
445      var handler = ExecutionTimeChanged;
446      if (handler != null) handler(this, EventArgs.Empty);
447    }
448
449    public event EventHandler ExecutionStateChanged;
450    protected virtual void OnExecutionStateChanged() {
451      var handler = ExecutionStateChanged;
452      if (handler != null) handler(this, EventArgs.Empty);
453    }
454    public event EventHandler TaskReceived;
455    protected virtual void OnTaskReceived() {
456      var handler = TaskReceived;
457      if (handler != null) handler(this, EventArgs.Empty);
458    }
459    public event EventHandler IsProgressingChanged;
460    private void OnIsProgressingChanged() {
461      var handler = IsProgressingChanged;
462      if (handler != null) handler(this, EventArgs.Empty);
463    }
464    #endregion
465
466    #region HiveTasks Events
467    private void RegisterHiveTasksEvents() {
468      this.hiveTasks.ItemsAdded += new CollectionItemsChangedEventHandler<HiveTask>(hivetasks_ItemsAdded);
469      this.hiveTasks.ItemsRemoved += new CollectionItemsChangedEventHandler<HiveTask>(hiveTasks_ItemsRemoved);
470      this.hiveTasks.CollectionReset += new CollectionItemsChangedEventHandler<HiveTask>(hiveTasks_CollectionReset);
471    }
472
473    private void DeregisterHiveTasksEvents() {
474      this.hiveTasks.ItemsAdded -= new CollectionItemsChangedEventHandler<HiveTask>(hivetasks_ItemsAdded);
475      this.hiveTasks.ItemsRemoved -= new CollectionItemsChangedEventHandler<HiveTask>(hiveTasks_ItemsRemoved);
476      this.hiveTasks.CollectionReset -= new CollectionItemsChangedEventHandler<HiveTask>(hiveTasks_CollectionReset);
477    }
478
479    private void hiveTasks_CollectionReset(object sender, CollectionItemsChangedEventArgs<HiveTask> e) {
480      foreach (var item in e.Items) {
481        item.StateLogChanged -= new EventHandler(item_StateLogChanged);
482      }
483      OnHiveTasksReset(e);
484    }
485
486    private void hiveTasks_ItemsRemoved(object sender, CollectionItemsChangedEventArgs<HiveTask> e) {
487      foreach (var item in e.Items) {
488        item.StateLogChanged -= new EventHandler(item_StateLogChanged);
489      }
490      OnHiveTasksRemoved(e);
491    }
492
493    private void hivetasks_ItemsAdded(object sender, CollectionItemsChangedEventArgs<HiveTask> e) {
494      foreach (var item in e.Items) {
495        item.StateLogChanged += new EventHandler(item_StateLogChanged);
496        item.IsControllable = this.IsControllable;
497      }
498      OnHiveTasksAdded(e);
499    }
500
501    private void item_StateLogChanged(object sender, EventArgs e) {
502      OnStateLogListChanged();
503    }
504    #endregion
505
506    public event EventHandler HiveTasksChanged;
507    protected virtual void OnHiveTasksChanged() {
508      if (this.HiveTasks != null && this.HiveTasks.Count > 0 && this.GetAllHiveTasks().All(x => x.Task.Id != Guid.Empty)) {
509        if (IsFinished()) {
510          this.ExecutionState = Core.ExecutionState.Stopped;
511          this.RefreshAutomatically = false;
512          StopResultPolling();
513        } else if (IsPaused()) {
514          this.executionState = Core.ExecutionState.Paused;
515          this.RefreshAutomatically = false;
516          StopResultPolling();
517        } else {
518          this.RefreshAutomatically = true;
519        }
520      }
521
522      var handler = HiveTasksChanged;
523      if (handler != null) handler(this, EventArgs.Empty);
524    }
525
526    public event EventHandler Loaded;
527    public virtual void OnLoaded() {
528      this.UpdateTotalExecutionTime();
529      this.OnStateLogListChanged();
530
531      if (this.ExecutionState != ExecutionState.Stopped && this.ExecutionState != ExecutionState.Paused) {
532        this.RefreshAutomatically = true;
533      }
534
535      var handler = Loaded;
536      if (handler != null) handler(this, EventArgs.Empty);
537    }
538
539    public event EventHandler<CollectionItemsChangedEventArgs<HiveTask>> HiveTasksAdded;
540    private void OnHiveTasksAdded(CollectionItemsChangedEventArgs<HiveTask> e) {
541      var handler = HiveTasksAdded;
542      if (handler != null) handler(this, e);
543    }
544
545    public event EventHandler<CollectionItemsChangedEventArgs<HiveTask>> HiveTasksRemoved;
546    private void OnHiveTasksRemoved(CollectionItemsChangedEventArgs<HiveTask> e) {
547      var handler = HiveTasksRemoved;
548      if (handler != null) handler(this, e);
549    }
550
551    public event EventHandler<CollectionItemsChangedEventArgs<HiveTask>> HiveTasksReset;
552    private void OnHiveTasksReset(CollectionItemsChangedEventArgs<HiveTask> e) {
553      var handler = HiveTasksReset;
554      if (handler != null) handler(this, e);
555    }
556
557    public Guid Id {
558      get {
559        if (job == null) return Guid.Empty;
560        return job.Id;
561      }
562      set { job.Id = value; }
563    }
564    public bool Modified {
565      get { return job.Modified; }
566    }
567    public void Store() {
568      job.Store();
569    }
570    public string ItemDescription {
571      get { return job.ItemDescription; }
572    }
573    public Image ItemImage {
574      get { return job.ItemImage; }
575    }
576    public string ItemName {
577      get { return job.ItemName; }
578    }
579    public Version ItemVersion {
580      get { return job.ItemVersion; }
581    }
582
583    public override string ToString() {
584      return string.Format("{0} {1}", Job.DateCreated.ToString("MM.dd.yyyy HH:mm"), Job.ToString());
585    }
586
587    public bool IsFinished() {
588      var tasks = GetAllHiveTasks();
589      return tasks.All(x => x.Task.State == TaskState.Finished
590                            || x.Task.State == TaskState.Aborted
591                            || x.Task.State == TaskState.Failed);
592    }
593
594    public bool IsPaused() {
595      var tasks = GetAllHiveTasks().Where(x => !x.Task.IsParentTask);
596      return tasks.All(x => x.Task.State != TaskState.Waiting
597                            && x.Task.State != TaskState.Transferring
598                            && x.Task.State != TaskState.Calculating)
599             && tasks.Any(x => x.Task.State == TaskState.Paused);
600    }
601
602    public IEnumerable<HiveTask> GetAllHiveTasks() {
603      if (hiveTasks == null) return Enumerable.Empty<HiveTask>();
604
605      var tasks = new List<HiveTask>();
606      foreach (HiveTask task in HiveTasks) {
607        tasks.AddRange(task.GetAllHiveTasks());
608      }
609      return tasks;
610    }
611
612    public int CompareTo(RefreshableJob other) {
613      return this.ToString().CompareTo(other.ToString());
614    }
615
616    public void Unload() {
617      // stop result polling
618      if (refreshAutomatically)
619        RefreshAutomatically = false;
620      DisposeTasks();
621      hiveTasks = new ItemCollection<HiveTask>();
622    }
623
624    #region IDisposable Members
625    public void Dispose() {
626      if (jobDownloader != null) {
627        jobDownloader.ExceptionOccured -= new EventHandler<EventArgs<Exception>>(jobDownloader_ExceptionOccured);
628        jobDownloader.Dispose();
629        jobDownloader = null;
630      }
631      if (jobResultPoller != null) {
632        DeregisterResultPollingEvents();
633        jobResultPoller = null;
634      }
635      if (hiveTasks != null) {
636        DisposeTasks();
637      }
638      if (job != null) {
639        DeregisterJobEvents();
640        job = null;
641      }
642    }
643
644    private void DisposeTasks() {
645      DeregisterHiveTasksEvents();
646      foreach (var task in hiveTasks) {
647        task.Dispose();
648      }
649      hiveTasks.Clear(); // this should remove the item_StateLogChanged event handlers
650      hiveTasks = null;
651    }
652    #endregion
653  }
654}
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