Refactor ParameterResource to use Lazy initialization for value retrieval#10361
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Refactor ParameterResource to use Lazy initialization for value retrieval#10361
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…eval - This is to prevent generated parameters from being accessed concurrently and generating different values. This is more of a concern now because of asynchrony.
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Pull Request Overview
This PR refactors the ParameterResource class to use lazy initialization for parameter value retrieval to prevent race conditions when generated parameters are accessed concurrently. The change addresses a flaky test issue that became more prevalent after introducing asynchrony in parameter resolution.
- Replaces manual caching logic with
Lazy<string>for thread-safe value initialization - Removes the custom
_hasValueflag and_valuefield in favor of the built-in lazy initialization pattern - Simplifies the
ValueInternalproperty implementation
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| ArgumentNullException.ThrowIfNull(callback); | ||
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| _valueGetter = callback; | ||
| _lazyValue = new Lazy<string>(() => _valueGetter(Default)); |
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What is the default safety mode when not specified explicitly? Is it thread safe?
I think it would be clearer to specify it explicitly.
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ExecutionAndPublication, the one that you always want by default 😄
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* Force async execution of resource startup - Previously we didn't preemptively dispatch to the threadpool per resource on startup. That causes issues blocking other resource's startup because of a single blocking call. This change dispatching preemptively before creating the dcp resource. * Refactor ParameterResource to use Lazy initialization for value retrieval (#10361) --------- Co-authored-by: David Fowler <davidfowl@gmail.com>
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Found in a new flaky test after the async parameter PR:
Throwing agent mode at test logs is 👨🏾🍳
PS: This was a problem before but is more prevalent now because we introduced asynchrony in parameter resolution.