source: trunk/sources/HeuristicLab.Clients.Hive/3.3/RefreshableJob.cs @ 9219

Last change on this file since 9219 was 9219, checked in by ascheibe, 7 years ago

#2005 merged Hive Job Unloading branch back into trunk

File size: 23.8 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2012 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            StopResultPolling();
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    // may execute jobs with privileged permissions on slaves
160    public bool IsAllowedPrivileged {
161      get { return Job.IsPrivileged; }
162      set {
163        if (value != Job.IsPrivileged) {
164          Job.IsPrivileged = value;
165          OnIsAllowedPrivilegedChanged();
166        }
167      }
168    }
169
170    private Progress progress;
171    public Progress Progress {
172      get { return progress; }
173      set {
174        this.progress = value;
175        OnIsProgressingChanged();
176      }
177    }
178
179
180    private ThreadSafeLog log;
181    public ILog Log {
182      get { return log; }
183    }
184
185    public StateLogListList StateLogList {
186      get { return new StateLogListList(this.GetAllHiveTasks().Select(x => x.StateLog)); }
187    }
188
189    #region Constructors and Cloning
190    public RefreshableJob() {
191      this.refreshAutomatically = false;
192      this.Job = new Job();
193      this.log = new ThreadSafeLog();
194      this.jobDownloader = new ConcurrentTaskDownloader<ItemTask>(Settings.Default.MaxParallelDownloads, Settings.Default.MaxParallelDownloads);
195      this.jobDownloader.ExceptionOccured += new EventHandler<EventArgs<Exception>>(jobDownloader_ExceptionOccured);
196      this.HiveTasks = new ItemCollection<HiveTask>();
197    }
198    public RefreshableJob(Job hiveExperiment) {
199      this.refreshAutomatically = true;
200      this.Job = hiveExperiment;
201      this.log = new ThreadSafeLog();
202      this.jobDownloader = new ConcurrentTaskDownloader<ItemTask>(Settings.Default.MaxParallelDownloads, Settings.Default.MaxParallelDownloads);
203      this.jobDownloader.ExceptionOccured += new EventHandler<EventArgs<Exception>>(jobDownloader_ExceptionOccured);
204      this.HiveTasks = new ItemCollection<HiveTask>();
205    }
206    protected RefreshableJob(RefreshableJob original, Cloner cloner) {
207      cloner.RegisterClonedObject(original, this);
208      this.Job = cloner.Clone(original.Job);
209      this.IsControllable = original.IsControllable;
210      this.log = cloner.Clone(original.log);
211      this.RefreshAutomatically = false; // do not start results polling automatically
212      this.jobDownloader = new ConcurrentTaskDownloader<ItemTask>(Settings.Default.MaxParallelDownloads, Settings.Default.MaxParallelDownloads);
213      this.jobDownloader.ExceptionOccured += new EventHandler<EventArgs<Exception>>(jobDownloader_ExceptionOccured);
214      this.HiveTasks = cloner.Clone(original.HiveTasks);
215      this.ExecutionTime = original.ExecutionTime;
216      this.ExecutionState = original.ExecutionState;
217    }
218    public IDeepCloneable Clone(Cloner cloner) {
219      return new RefreshableJob(this, cloner);
220    }
221    public object Clone() {
222      return this.Clone(new Cloner());
223    }
224    #endregion
225
226    #region JobResultPoller Events
227    public void StartResultPolling() {
228      if (jobResultPoller == null) {
229        jobResultPoller = new JobResultPoller(job.Id, Settings.Default.ResultPollingInterval);
230        RegisterResultPollingEvents();
231        jobResultPoller.AutoResumeOnException = false;
232      }
233
234      if (!jobResultPoller.IsPolling) {
235        jobResultPoller.Start();
236      }
237    }
238
239    public void StopResultPolling() {
240      if (jobResultPoller != null && jobResultPoller.IsPolling) {
241        jobResultPoller.Stop();
242        DeregisterResultPollingEvents();
243      }
244    }
245
246    private void RegisterResultPollingEvents() {
247      jobResultPoller.ExceptionOccured += new EventHandler<EventArgs<Exception>>(jobResultPoller_ExceptionOccured);
248      jobResultPoller.JobResultsReceived += new EventHandler<EventArgs<IEnumerable<LightweightTask>>>(jobResultPoller_JobResultReceived);
249      jobResultPoller.IsPollingChanged += new EventHandler(jobResultPoller_IsPollingChanged);
250    }
251    private void DeregisterResultPollingEvents() {
252      jobResultPoller.ExceptionOccured -= new EventHandler<EventArgs<Exception>>(jobResultPoller_ExceptionOccured);
253      jobResultPoller.JobResultsReceived -= new EventHandler<EventArgs<IEnumerable<LightweightTask>>>(jobResultPoller_JobResultReceived);
254      jobResultPoller.IsPollingChanged -= new EventHandler(jobResultPoller_IsPollingChanged);
255    }
256    private void jobResultPoller_IsPollingChanged(object sender, EventArgs e) {
257      if (this.refreshAutomatically != jobResultPoller.IsPolling) {
258        this.refreshAutomatically = jobResultPoller.IsPolling;
259        OnRefreshAutomaticallyChanged();
260      }
261    }
262
263    private void jobResultPoller_JobResultReceived(object sender, EventArgs<IEnumerable<LightweightTask>> e) {
264      lock (jobResultReceivedLocker) {
265        foreach (LightweightTask lightweightTask in e.Value) {
266          HiveTask hiveTask = GetHiveTaskById(lightweightTask.Id);
267          if (hiveTask != null) {
268            // lastJobDataUpdate equals DateTime.MinValue right after it was uploaded. When the first results are polled, this value is updated
269            if (hiveTask.Task.State == TaskState.Offline && lightweightTask.State == TaskState.Waiting) {
270              hiveTask.Task.LastTaskDataUpdate = lightweightTask.LastTaskDataUpdate;
271            }
272
273            hiveTask.UpdateFromLightweightJob(lightweightTask);
274
275            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)) {
276              log.LogMessage(string.Format("Downloading task {0}", lightweightTask.Id));
277              hiveTask.IsDownloading = true;
278              jobDownloader.DownloadTaskData(hiveTask.Task, (localJob, itemJob) => {
279                lock (downloadFinishedLocker) {
280                  log.LogMessage(string.Format("Finished downloading task {0}", localJob.Id));
281                  HiveTask localHiveTask = GetHiveTaskById(localJob.Id);
282
283                  if (itemJob == null) {
284                    // something bad happened to this task. bad task, BAAAD task!
285                    localHiveTask.IsDownloading = false;
286                  } else {
287                    // if the task is paused, download but don't integrate into parent optimizer (to avoid Prepare)
288                    if (localJob.State == TaskState.Paused) {
289                      localHiveTask.ItemTask = itemJob;
290                    } else {
291                      if (localJob.ParentTaskId.HasValue) {
292                        HiveTask parentHiveTask = GetHiveTaskById(localJob.ParentTaskId.Value);
293                        parentHiveTask.IntegrateChild(itemJob, localJob.Id);
294                      } else {
295                        localHiveTask.ItemTask = itemJob;
296                      }
297                    }
298                    localHiveTask.IsDownloading = false;
299                    localHiveTask.Task.LastTaskDataUpdate = lightweightTask.LastTaskDataUpdate;
300                  }
301                }
302              });
303            }
304          }
305        }
306        GC.Collect(); // force GC, because .NET is too lazy here (deserialization takes a lot of memory)
307        if (AllJobsFinished()) {
308          this.ExecutionState = Core.ExecutionState.Stopped;
309          StopResultPolling();
310        }
311        UpdateTotalExecutionTime();
312        UpdateStatistics();
313        OnStateLogListChanged();
314        OnTaskReceived();
315      }
316    }
317
318    public HiveTask GetHiveTaskById(Guid jobId) {
319      foreach (HiveTask t in this.HiveTasks) {
320        var hj = t.GetHiveTaskByTaskId(jobId);
321        if (hj != null)
322          return hj;
323      }
324      return null;
325    }
326
327    private void UpdateStatistics() {
328      var jobs = this.GetAllHiveTasks();
329      job.JobCount = jobs.Count();
330      job.CalculatingCount = jobs.Count(j => j.Task.State == TaskState.Calculating);
331      job.FinishedCount = jobs.Count(j => j.Task.State == TaskState.Finished);
332      OnJobStatisticsChanged();
333    }
334
335    public bool AllJobsFinished() {
336      return this.GetAllHiveTasks().All(j => (j.Task.State == TaskState.Finished
337                                                   || j.Task.State == TaskState.Aborted
338                                                   || j.Task.State == TaskState.Failed)
339                                                   && !j.IsDownloading);
340    }
341
342    private void jobResultPoller_ExceptionOccured(object sender, EventArgs<Exception> e) {
343      OnExceptionOccured(sender, e.Value);
344    }
345    private void jobDownloader_ExceptionOccured(object sender, EventArgs<Exception> e) {
346      OnExceptionOccured(sender, e.Value);
347    }
348    public void UpdateTotalExecutionTime() {
349      this.ExecutionTime = TimeSpan.FromMilliseconds(this.GetAllHiveTasks().Sum(x => x.Task.ExecutionTime.TotalMilliseconds));
350    }
351    #endregion
352
353    #region Job Events
354    private void RegisterJobEvents() {
355      job.ToStringChanged += new EventHandler(OnToStringChanged);
356      job.PropertyChanged += new PropertyChangedEventHandler(job_PropertyChanged);
357      job.ItemImageChanged += new EventHandler(job_ItemImageChanged);
358      job.ModifiedChanged += new EventHandler(job_ModifiedChanged);
359    }
360
361    private void DeregisterJobEvents() {
362      job.ToStringChanged -= new EventHandler(OnToStringChanged);
363      job.PropertyChanged -= new PropertyChangedEventHandler(job_PropertyChanged);
364      job.ItemImageChanged -= new EventHandler(job_ItemImageChanged);
365      job.ModifiedChanged -= new EventHandler(job_ModifiedChanged);
366    }
367    #endregion
368
369    #region Event Handler
370    public event EventHandler RefreshAutomaticallyChanged;
371    private void OnRefreshAutomaticallyChanged() {
372      var handler = RefreshAutomaticallyChanged;
373      if (handler != null) handler(this, EventArgs.Empty);
374    }
375
376    public event EventHandler JobChanged;
377    private void OnJobChanged() {
378      var handler = JobChanged;
379      if (handler != null) handler(this, EventArgs.Empty);
380    }
381
382    public event EventHandler ModifiedChanged;
383    private void job_ModifiedChanged(object sender, EventArgs e) {
384      var handler = ModifiedChanged;
385      if (handler != null) handler(sender, e);
386    }
387
388    public event EventHandler ItemImageChanged;
389    private void job_ItemImageChanged(object sender, EventArgs e) {
390      var handler = ItemImageChanged;
391      if (handler != null) handler(this, e);
392    }
393
394    public event PropertyChangedEventHandler PropertyChanged;
395    private void job_PropertyChanged(object sender, PropertyChangedEventArgs e) {
396      this.IsSharable = job.Permission == Permission.Full;
397      this.IsControllable = job.Permission == Permission.Full;
398
399      var handler = PropertyChanged;
400      if (handler != null) handler(sender, e);
401    }
402
403    public event EventHandler ToStringChanged;
404    private void OnToStringChanged(object sender, EventArgs e) {
405      var handler = ToStringChanged;
406      if (handler != null) handler(this, e);
407    }
408
409    public event EventHandler IsDownloadableChanged;
410    private void OnIsDownloadableChanged() {
411      var handler = IsDownloadableChanged;
412      if (handler != null) handler(this, EventArgs.Empty);
413    }
414
415    public event EventHandler IsControllableChanged;
416    private void OnIsControllableChanged() {
417      var handler = IsControllableChanged;
418      if (handler != null) handler(this, EventArgs.Empty);
419    }
420
421    public event EventHandler IsSharableChanged;
422    private void OnIsSharableChanged() {
423      var handler = IsSharableChanged;
424      if (handler != null) handler(this, EventArgs.Empty);
425    }
426
427    public event EventHandler IsAllowedPrivilegedChanged;
428    private void OnIsAllowedPrivilegedChanged() {
429      var handler = IsAllowedPrivilegedChanged;
430      if (handler != null) handler(this, EventArgs.Empty);
431    }
432
433    public event EventHandler JobStatisticsChanged;
434    private void OnJobStatisticsChanged() {
435      var handler = JobStatisticsChanged;
436      if (handler != null) handler(this, EventArgs.Empty);
437    }
438
439    public event EventHandler<EventArgs<Exception>> ExceptionOccured;
440    private void OnExceptionOccured(object sender, Exception exception) {
441      log.LogException(exception);
442      var handler = ExceptionOccured;
443      if (handler != null) handler(sender, new EventArgs<Exception>(exception));
444    }
445
446    public event EventHandler StateLogListChanged;
447    private void OnStateLogListChanged() {
448      var handler = StateLogListChanged;
449      if (handler != null) handler(this, EventArgs.Empty);
450    }
451
452    public event EventHandler ExecutionTimeChanged;
453    protected virtual void OnExecutionTimeChanged() {
454      var handler = ExecutionTimeChanged;
455      if (handler != null) handler(this, EventArgs.Empty);
456    }
457
458    public event EventHandler ExecutionStateChanged;
459    protected virtual void OnExecutionStateChanged() {
460      var handler = ExecutionStateChanged;
461      if (handler != null) handler(this, EventArgs.Empty);
462    }
463    public event EventHandler TaskReceived;
464    protected virtual void OnTaskReceived() {
465      var handler = TaskReceived;
466      if (handler != null) handler(this, EventArgs.Empty);
467    }
468    public event EventHandler IsProgressingChanged;
469    private void OnIsProgressingChanged() {
470      var handler = IsProgressingChanged;
471      if (handler != null) handler(this, EventArgs.Empty);
472    }
473    #endregion
474
475    #region HiveTasks Events
476    private void RegisterHiveTasksEvents() {
477      this.hiveTasks.ItemsAdded += new CollectionItemsChangedEventHandler<HiveTask>(hivetasks_ItemsAdded);
478      this.hiveTasks.ItemsRemoved += new CollectionItemsChangedEventHandler<HiveTask>(hiveTasks_ItemsRemoved);
479      this.hiveTasks.CollectionReset += new CollectionItemsChangedEventHandler<HiveTask>(hiveTasks_CollectionReset);
480    }
481
482    private void DeregisterHiveTasksEvents() {
483      this.hiveTasks.ItemsAdded -= new CollectionItemsChangedEventHandler<HiveTask>(hivetasks_ItemsAdded);
484      this.hiveTasks.ItemsRemoved -= new CollectionItemsChangedEventHandler<HiveTask>(hiveTasks_ItemsRemoved);
485      this.hiveTasks.CollectionReset -= new CollectionItemsChangedEventHandler<HiveTask>(hiveTasks_CollectionReset);
486    }
487
488    private void hiveTasks_CollectionReset(object sender, CollectionItemsChangedEventArgs<HiveTask> e) {
489      foreach (var item in e.Items) {
490        item.StateLogChanged -= new EventHandler(item_StateLogChanged);
491      }
492      OnHiveTasksReset(e);
493    }
494
495    private void hiveTasks_ItemsRemoved(object sender, CollectionItemsChangedEventArgs<HiveTask> e) {
496      foreach (var item in e.Items) {
497        item.StateLogChanged -= new EventHandler(item_StateLogChanged);
498      }
499      OnHiveTasksRemoved(e);
500    }
501
502    private void hivetasks_ItemsAdded(object sender, CollectionItemsChangedEventArgs<HiveTask> e) {
503      foreach (var item in e.Items) {
504        item.StateLogChanged += new EventHandler(item_StateLogChanged);
505        item.IsControllable = this.IsControllable;
506      }
507      OnHiveTasksAdded(e);
508    }
509
510    private void item_StateLogChanged(object sender, EventArgs e) {
511      OnStateLogListChanged();
512    }
513    #endregion
514
515    public event EventHandler HiveTasksChanged;
516    protected virtual void OnHiveTasksChanged() {
517      StopResultPolling();
518      if (this.HiveTasks != null && this.HiveTasks.Count > 0 && this.GetAllHiveTasks().All(x => x.Task.Id != Guid.Empty)) {
519        if (IsFinished()) {
520          this.ExecutionState = Core.ExecutionState.Stopped;
521          this.RefreshAutomatically = false;
522          if (jobResultPoller != null) DeregisterResultPollingEvents();
523        } else {
524          this.RefreshAutomatically = true;
525        }
526      }
527
528      var handler = HiveTasksChanged;
529      if (handler != null) handler(this, EventArgs.Empty);
530    }
531
532    public event EventHandler Loaded;
533    public virtual void OnLoaded() {
534      this.UpdateTotalExecutionTime();
535      this.OnStateLogListChanged();
536
537      if (this.ExecutionState != ExecutionState.Stopped) {
538        this.RefreshAutomatically = true;
539      }
540
541      var handler = Loaded;
542      if (handler != null) handler(this, EventArgs.Empty);
543    }
544
545    public event EventHandler<CollectionItemsChangedEventArgs<HiveTask>> HiveTasksAdded;
546    private void OnHiveTasksAdded(CollectionItemsChangedEventArgs<HiveTask> e) {
547      var handler = HiveTasksAdded;
548      if (handler != null) handler(this, e);
549    }
550
551    public event EventHandler<CollectionItemsChangedEventArgs<HiveTask>> HiveTasksRemoved;
552    private void OnHiveTasksRemoved(CollectionItemsChangedEventArgs<HiveTask> e) {
553      var handler = HiveTasksRemoved;
554      if (handler != null) handler(this, e);
555    }
556
557    public event EventHandler<CollectionItemsChangedEventArgs<HiveTask>> HiveTasksReset;
558    private void OnHiveTasksReset(CollectionItemsChangedEventArgs<HiveTask> e) {
559      var handler = HiveTasksReset;
560      if (handler != null) handler(this, e);
561    }
562
563    public Guid Id {
564      get {
565        if (job == null) return Guid.Empty;
566        return job.Id;
567      }
568      set { job.Id = value; }
569    }
570    public bool Modified {
571      get { return job.Modified; }
572    }
573    public void Store() {
574      job.Store();
575    }
576    public string ItemDescription {
577      get { return job.ItemDescription; }
578    }
579    public Image ItemImage {
580      get { return job.ItemImage; }
581    }
582    public string ItemName {
583      get { return job.ItemName; }
584    }
585    public Version ItemVersion {
586      get { return job.ItemVersion; }
587    }
588
589    public override string ToString() {
590      return string.Format("{0} {1}", Job.DateCreated.ToString("MM.dd.yyyy HH:mm"), Job.ToString());
591    }
592
593    public bool IsFinished() {
594      return HiveTasks != null
595        && HiveTasks.All(x => x.Task.DateFinished.HasValue && x.Task.DateCreated.HasValue);
596    }
597
598    public IEnumerable<HiveTask> GetAllHiveTasks() {
599      if (hiveTasks == null) return Enumerable.Empty<HiveTask>();
600
601      var tasks = new List<HiveTask>();
602      foreach (HiveTask task in HiveTasks) {
603        tasks.AddRange(task.GetAllHiveTasks());
604      }
605      return tasks;
606    }
607
608    public int CompareTo(RefreshableJob other) {
609      return this.ToString().CompareTo(other.ToString());
610    }
611
612    public void Unload() {
613      // stop result polling
614      if (refreshAutomatically)
615        RefreshAutomatically = false;
616      DisposeTasks();
617      hiveTasks = new ItemCollection<HiveTask>();
618    }
619
620    #region IDisposable Members
621    public void Dispose() {
622      if (jobDownloader != null) {
623        jobDownloader.ExceptionOccured -= new EventHandler<EventArgs<Exception>>(jobDownloader_ExceptionOccured);
624        jobDownloader.Dispose();
625        jobDownloader = null;
626      }
627      if (jobResultPoller != null) {
628        DeregisterResultPollingEvents();
629        jobResultPoller = null;
630      }
631      if (hiveTasks != null) {
632        DisposeTasks();
633      }
634      if (job != null) {
635        DeregisterJobEvents();
636        job = null;
637      }
638    }
639
640    private void DisposeTasks() {
641      DeregisterHiveTasksEvents();
642      foreach (var task in hiveTasks) {
643        task.Dispose();
644      }
645      hiveTasks.Clear(); // this should remove the item_StateLogChanged event handlers
646      hiveTasks = null;
647    }
648    #endregion
649  }
650}
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