Add the interface for pre-shutdown callback#1714

Merged

fujitatomoya merged 2 commits intoros2:masterfrom Barry-Xu-2018:topic-add-pre-shutdown-callback

Oct 30, 2021

Commits on Oct 28, 2021

Add the interface for pre-shutdown callback

Barry-Xu-2018
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mergify-bot
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Commits on Oct 29, 2021

Address review comments
Barry-Xu-2018
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