feat: flagd file polling for offline mode #614
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...enfeature/contrib/providers/flagd/resolver/process/storage/connector/file/FileConnector.java
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Approving with this question. I will let you consider it and decide if you think it's something we should worry about in this PR.
Thanks for the review. Regarding the concurrency concern, I will address it in a dedicated PR. As described here only possibility for concurrent issues is if the same provider get registered multiple times (which is allowed in spec). And I think we need to check this edge case in other lang. implementations as well. |
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Signed-off-by: Kavindu Dodanduwa <kavindudodanduwa@gmail.com>
Signed-off-by: Kavindu Dodanduwa <kavindudodanduwa@gmail.com>
Signed-off-by: Kavindu Dodanduwa <kavindudodanduwa@gmail.com>
Signed-off-by: Kavindu Dodanduwa <kavindudodanduwa@gmail.com>
Signed-off-by: Kavindu Dodanduwa <kavindudodanduwa@gmail.com>
Signed-off-by: Kavindu Dodanduwa <kavindudodanduwa@gmail.com>
Signed-off-by: Kavindu Dodanduwa <kavindudodanduwa@gmail.com>
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…ature#614) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
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This PR
Enhance flagd in-process offline mode introduced through #473 by adding polling support and align with the change proposed at flagd js-sdk (open-feature/js-sdk-contrib#708)
Polling happens at intervals of 5 seconds and runs concurrently. If an update is observed, connect offers the newest content to the storage through the connector contract.
Note on polling
The reason to use polling is the known limitation of Java WatchService when it comes to non-local file systems. This blog post 1 extensively describes the problem. Besides, the offline mode is intended for limited use cases such as testing, local development efforts or POC deployments where the impact of polling is minimal.
Footnotes
https://blog.arkey.fr/2019/09/13/watchservice-and-bind-mount/ ↩