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Fix race condition in generic diagnostic listener#948
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Please ignore build failure, it was cancelled, re-started and passed, but github did not pick up successful run |
| this.Client = new TelemetryClient(configuration); | ||
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| public void Subscribe() |
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for this public method, can you please add a
cijothomas
approved these changes
Jul 9, 2018
| private IDisposable listenerSubscription; | ||
| private List<IDisposable> individualSubscriptions; | ||
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| protected DiagnosticSourceListenerBase(TelemetryConfiguration configuration) |
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Because the Subscribe method is required, should we make a reference to it in the constructor?
I don't know how often a developer creates a new DiagnosticSourceListener (probably not often :) ), but I wonder that they may not know to look for the Subscribe method.
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this is an internal class, it's only us who call this method and just once. I can add the comment, though
TimothyMothra
approved these changes
Jul 10, 2018
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When generic diagnostic listener subscribes to DiagnosticSource, it attempts to use this in its own constructor, while some properties (filters) are not initialized yet.
As a result, if DiagnosticSource is created BEFORE the generic listener, it's guaranteed to miss subscription event and never receive anything.
This PR fixes this issue.
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Changes in public surface reviewed
Design discussion issue #
CHANGELOG.md updated with one line description of the fix, and a link to the original issue.
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