nuclex-shared-dotnet/Nuclex.Support
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Fixed some possible issues in the ProgressionTracker; wrote several new NMock-assisted tests for it

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git-svn-id: file:///srv/devel/repo-conversion/nusu@38 d2e56fa2-650e-0410-a79f-9358c0239efd
This commit is contained in:
Markus Ewald 2007-07-12 22:02:23 +00:00
parent ba1cee917d
commit 81cb56f468
3 changed files with 166 additions and 38 deletions
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21
Source/Tracking/Internal/ObservedWeightedProgression.cs
View File

@ -47,14 +47,23 @@ namespace Nuclex.Support.Tracking {
ReportDelegate endedCallback
) {
this.weightedProgression = weightedProgression;
this.endedCallback = endedCallback;
this.progressUpdateCallback = progressUpdateCallback;
this.weightedProgression.Progression.AsyncEnded +=
new EventHandler(asyncEnded);
if(weightedProgression.Progression.Ended) {
this.weightedProgression.Progression.AsyncProgressUpdated +=
new EventHandler<ProgressUpdateEventArgs>(asyncProgressUpdated);
this.progress = 1.0f;
} else {
this.endedCallback = endedCallback;
this.progressUpdateCallback = progressUpdateCallback;
this.weightedProgression.Progression.AsyncEnded +=
new EventHandler(asyncEnded);
this.weightedProgression.Progression.AsyncProgressUpdated +=
new EventHandler<ProgressUpdateEventArgs>(asyncProgressUpdated);
}
}
/// <summary>Immediately releases all resources owned by the object</summary>

70
Source/Tracking/ProgressionTracker.Test.cs
View File

@ -232,6 +232,76 @@ namespace Nuclex.Support.Tracking {
this.mockery.VerifyAllExpectationsHaveBeenMet();
}
/// <summary>
/// Validates that the tracker behaves correctly if it is fed with progressions
/// that have already ended.
/// </summary>
[Test]
public void TestSoleEndedProgression() {
ProgressionTracker tracker = new ProgressionTracker();
IProgressionTrackerSubscriber mockedSubscriber = mockSubscriber(tracker);
tracker.Track(Progression.EndedDummy);
this.mockery.VerifyAllExpectationsHaveBeenMet();
}
/// <summary>
/// Validates that the tracker behaves correctly if it is fed with progressions
/// that have already ended in addition to progressions that are actively executing.
/// </summary>
[Test]
public void TestEndedProgression() {
ProgressionTracker tracker = new ProgressionTracker();
IProgressionTrackerSubscriber mockedSubscriber = mockSubscriber(tracker);
Expect.Once.On(mockedSubscriber).
Method("IdleStateChanged").
WithAnyArguments();
Expect.Once.On(mockedSubscriber).
Method("ProgressUpdated").
With(
new Matcher[] {
new NMock2.Matchers.TypeMatcher(typeof(ProgressionTracker)),
new ProgressUpdateEventArgsMatcher(new ProgressUpdateEventArgs(0.0f))
}
);
TestProgression test1 = new TestProgression();
tracker.Track(test1);
Expect.Once.On(mockedSubscriber).
Method("ProgressUpdated").
With(
new Matcher[] {
new NMock2.Matchers.TypeMatcher(typeof(ProgressionTracker)),
new ProgressUpdateEventArgsMatcher(new ProgressUpdateEventArgs(0.5f))
}
);
tracker.Track(Progression.EndedDummy);
Expect.Once.On(mockedSubscriber).
Method("ProgressUpdated").
With(
new Matcher[] {
new NMock2.Matchers.TypeMatcher(typeof(ProgressionTracker)),
new ProgressUpdateEventArgsMatcher(new ProgressUpdateEventArgs(1.0f))
}
);
Expect.Once.On(mockedSubscriber).
Method("IdleStateChanged").
WithAnyArguments();
test1.End();
this.mockery.VerifyAllExpectationsHaveBeenMet();
}
/// <summary>Mocks a subscriber for the events of a tracker</summary>
/// <param name="tracker">Tracker to mock an event subscriber for</param>
/// <returns>The mocked event subscriber</returns>

113
Source/Tracking/ProgressionTracker.cs
View File

@ -105,6 +105,7 @@ namespace Nuclex.Support.Tracking {
for(int index = 0; index < this.trackedProgressions.Count; ++index)
this.trackedProgressions[index].Dispose();
// Help the GC a bit by untangling the references :)
this.trackedProgressions.Clear();
this.trackedProgressions = null;
@ -128,30 +129,70 @@ namespace Nuclex.Support.Tracking {
// new progression added to the collection.
lock(this.trackedProgressions) {
this.trackedProgressions.Add(
new ObservedWeightedProgression<Progression>(
new WeightedProgression<Progression>(progression, weight),
this.asyncProgressUpdatedDelegate,
this.asyncEndedDelegate
)
);
bool wasEmpty = (this.trackedProgressions.Count == 0);
// This can be done after we registered the wrapper to our delegates because
// any incoming progress updates will be stopped from the danger of a
// division-by-zero from the potentially still zeroed totalWeight by the lock.
this.totalWeight += weight;
// If this is the first progression to be added to the list, tell our
// owner that we're idle no longer!
if(this.trackedProgressions.Count == 1)
OnAsyncIdleStateChanged(false);
// Construct a new observation wrapper. This is done inside the lock
// because as soon as we are subscribed to the events, we can potentially
// receive them. This would otherwise risk processing a progress update
// before the progression has been added to the tracked progressions list.
if(progression.Ended) {
// If the ended progression would become the only progression in the list,
// there's no sense in doing anything at all because it would have to
// be thrown right out again
if(!wasEmpty) {
this.trackedProgressions.Add(
new ObservedWeightedProgression<Progression>(
new WeightedProgression<Progression>(progression, weight),
this.asyncProgressUpdatedDelegate,
this.asyncEndedDelegate
)
);
// All done, the total progress is different now, so force a recalculation and
// send out the AsyncProgressUpdated event.
recalculateProgress();
}
} else { // Progression is still running
ObservedWeightedProgression<Progression> observedProgression =
new ObservedWeightedProgression<Progression>(
new WeightedProgression<Progression>(progression, weight),
this.asyncProgressUpdatedDelegate,
this.asyncEndedDelegate
);
this.trackedProgressions.Add(observedProgression);
// If this is the first progression to be added to the list, tell our
// owner that we're idle no longer!
if(wasEmpty)
setIdle(false);
// All done, the total progress is different now, so force a recalculation and
// send out the AsyncProgressUpdated event.
recalculateProgress();
// The progression might have ended before we had registered to its AsyncEnded
// event, so we have to do this to be on the safe side. This might cause
// asyncEnded() to be called twice, but that's not a problem at all.
if(progression.Ended) {
asyncEnded();
observedProgression.Dispose();
}
}
} // lock
// All done, the total progress is different now, so force a recalculation and
// send out the AsyncProgressUpdated event.
recalculateProgress();
}
/// <summary>Stops tracking the specified progression</summary>
@ -181,8 +222,8 @@ namespace Nuclex.Support.Tracking {
this.totalWeight = 0.0f;
// Report that we're idle now!
OnAsyncIdleStateChanged(true);
// If we entered the idle state with this call, report the state change!
setIdle(true);
} else {
@ -211,8 +252,6 @@ namespace Nuclex.Support.Tracking {
/// <summary>Fires the AsyncIdleStateChanged event</summary>
/// <param name="idle">New idle state to report</param>
protected virtual void OnAsyncIdleStateChanged(bool idle) {
this.idle = idle;
EventHandler<IdleStateEventArgs> copy = AsyncIdleStateChanged;
if(copy != null)
copy(this, new IdleStateEventArgs(idle));
@ -221,8 +260,6 @@ namespace Nuclex.Support.Tracking {
/// <summary>Fires the AsyncProgressUpdated event</summary>
/// <param name="progress">New progress to report</param>
protected virtual void OnAsyncProgressUpdated(float progress) {
this.progress = progress;
EventHandler<ProgressUpdateEventArgs> copy = AsyncProgressUpdated;
if(copy != null)
copy(this, new ProgressUpdateEventArgs(progress));
@ -253,10 +290,12 @@ namespace Nuclex.Support.Tracking {
// the one for the number of progressions we just summed -- by design,
// the total weight always has to be updated at the same time as the collection.
totalProgress /= this.totalWeight;
}
// Finally, trigger the event
OnAsyncProgressUpdated(totalProgress);
// Finally, trigger the event
this.progress = totalProgress;
OnAsyncProgressUpdated(totalProgress);
}
}
/// <summary>Called when one of the tracked progressions has ended</summary>
@ -270,16 +309,15 @@ namespace Nuclex.Support.Tracking {
if(!this.trackedProgressions[index].WeightedProgression.Progression.Ended)
return;
// All progressions have finished, get rid of the wrappers and disconnect
// their events.
for(int index = 0; index < this.trackedProgressions.Count; ++index)
this.trackedProgressions[index].Dispose();
// All progressions have finished, get rid of the wrappers and make a
// fresh start for future progressions to be tracked. No need to call
// Dispose() since, as a matter of fact, when the progression
this.trackedProgressions.Clear();
this.totalWeight = 0.0f;
// Notify our owner that we're idle now.
OnAsyncIdleStateChanged(true);
// Notify our owner that we're idle now. This line is only reached when all
// progressions were finished, so it's safe to trigger this here.
setIdle(true);
}
}
@ -289,6 +327,17 @@ namespace Nuclex.Support.Tracking {
recalculateProgress();
}
/// <summary>Changes the idle state</summary>
/// <param name="idle">Whether or not the tracker is currently idle</param>
/// <remarks>
/// This method expects to be called during a lock() on trackedProgressions!
/// </remarks>
private void setIdle(bool idle) {
this.idle = idle;
OnAsyncIdleStateChanged(idle);
}
/// <summary>Total weight of all progressions being tracked</summary>
private volatile float totalWeight;
/// <summary>Progressions being tracked by this tracker</summary>
@ -300,7 +349,7 @@ namespace Nuclex.Support.Tracking {
/// <summary>Whether the tracker is currently idle</summary>
private bool idle;
/// <summary>Current summed progress of the tracked progressions</summary>
private float progress;
private volatile float progress;
}