mdc-utils: Make LoggerStringWriter thread friendly #2771
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Motivation: We have seen some flakyness in HttpMessageDiscardWatchdogServiceFilterTest that may be related to thread safety for the test log appender. Specifically, - The sink, a StringWriter, is globally shared so it can be reset by concurrently running tests. - The underlying StringWriter itself isn't thread safe and it's possible for it to be concurrent written to and read from. Modifications: - Make a new (thread safe) StringWriter for each thread. Based on the usage pattern for the LoggerStringWriter methods this should have the effect of having a unique writer per test. - Make a thread-safe proxy for the StringWriter so it's safe to write and read from concurrently.
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Your comment was spot on, and made it clear to me that the thread-local stuff is just a hack to preserve the static API that isn't worth it. So, I made |
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daschl
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Motivation:
We have seen some flakyness in HttpMessageDiscardWatchdogServiceFilterTest that may be related to thread safety for the test log appender. Specifically,
Modifications:
Closes #2756. (hopefully)