Add the ability to stop the `Host` when one of its `BackgroundService` instances errors#50569

Merged

eerhardt merged 17 commits intodotnet:mainfrom IEvangelist:background-service-ex-behavior

Apr 16, 2021

+237-27

Commits on Mar 31, 2021

Added background service exception behavior enum. Update HostOptions and Host accordingly.
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Commits on Apr 5, 2021

Call IApplicationLifetime.StopApplication() instead of StopAsync().
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Commits on Apr 7, 2021

Moved enum out of abstractions. Encapsulate logging logic in extensions. Define new EventId. Simplify check, avoid null eval. Update triple dash comments per peer review.
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Set the default as StopHost
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Move ref bits from hosting.abstractions to hosting proper.
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Commits on Apr 8, 2021

Address feedback from peer review
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Commits on Apr 12, 2021

Added unit test to verify background service 1 gets started, and runs a bit - and other service can cause stop
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Commits on Apr 13, 2021

Commits on Apr 14, 2021

Fix test hang issue
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Commits on Apr 15, 2021

Separate StartAsync and ExecuteTask, let StartAsync bubble. Adjust unit tests...
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Commits on Apr 16, 2021

Update the background service async exceptions get logged unit test
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