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Bug #4310

open

ValueListeners receive valueChanged events when values have not changed

Added by Daniel Crawl over 15 years ago. Updated almost 15 years ago.

Status:
New
Priority:
Immediate
Assignee:
Daniel Crawl
Category:
general
Target version:
2.X.Y
Start date:
08/13/2009
Due date:
% Done:

0%

Estimated time:
Bugzilla-Id:
4310

Description

A ValueListener sometimes receives events for a Settable when the Settable's value has not changed. This can lead to a stack overflow since reading the value of the Settable may generate another valueChanged event.

To fix this, valueChanged not be called unless the value has actually changed.

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 #1

Updated by Christopher Brooks over 15 years ago

We need a test case for this.

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 #2

Updated by Matt Jones over 15 years ago

The implications for this are not clear. Sounds like it is a serious bug that should be fixed, but we need a more detailed test case demonstrating the problem. Dan -- please either provide a way to reproduce this or retarget it to 2.X.Y.

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 #3

Updated by Daniel Crawl over 15 years ago

Calling getValueAsString on Distributor.input_tokenConsumptionRate always generates a value changed event.

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 #4

Updated by Bertram Ludaescher over 15 years ago

getValueAsString sounds like a "read only" activity, so I understand that a "valueChanged" event is a surprise, if not a bug. I'm glad we're not doing Heisenberg or other quantum experiments here..

More seriously: I wanted to confirm (maybe Edward would know) whether there is not a deeper reason why valueChanged is raised. It certainly sounds as if it shouldn't be though ...
If it results in a stack overflow, we are in trouble..

B

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 #5

Updated by Redmine Admin over 11 years ago

Original Bugzilla ID was 4310

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