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Posted to commits@beam.apache.org by "Eugene Kirpichov (JIRA)" <ji...@apache.org> on 2016/10/03 18:46:20 UTC
[jira] [Created] (BEAM-702) Simple pattern for per-bundle and
per-DoFn Closeable resources
Eugene Kirpichov created BEAM-702:
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Summary: Simple pattern for per-bundle and per-DoFn Closeable resources
Key: BEAM-702
URL: https://issues.apache.org/jira/browse/BEAM-702
Project: Beam
Issue Type: Improvement
Reporter: Eugene Kirpichov
Dealing with Closeable resources inside a processElement call is easy: simply use try-with-resources.
However, bundle- or DoFn-scoped resources, such as long-lived database connections, are less convenient to deal with: you have to open them in startBundle and conditionally close in finishBundle (likewise setup/teardown), taking special care if there's multiple resources to close all of them.
Perhaps we should provide something like Guava's Closer to DoFn's https://github.com/google/guava/wiki/ClosingResourcesExplained. Ideally, the user would need to only write a startBundle() or setup() method, but not write finishBundle() or teardown() - resources would be closed automatically.
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