wangjialing218 opened a new pull request #13205:
URL: https://github.com/apache/pulsar/pull/13205
### Motivation
This patch is based on #11112, I have talked with @wuchenxi123 and I will
continue the work for this feature.
### Modifications
Introduce `RichFunction` interface extends `Function`, which provide
`setup` and `tearDown` API.
`setup` is called only once when function instance started. `tearDown` is
called when function instance closed.
User could use these interface to initialize and release their external
resources such as RedisClient.
### Does this pull request potentially affect one of the following parts:
*If `yes` was chosen, please highlight the changes*
- The public API: ( **yes**)
### Documentation
Check the box below and label this PR (if you have committer privilege).
Need to update docs?
- [x] `doc-required`
I think we need to add chapter to tell user how to use the API in
`functions-develop.md`
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