Jeremy Kahn created AVRO-1289:
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Summary: Python: Schema objects should polymorphically interact
with data-walker interface
Key: AVRO-1289
URL: https://issues.apache.org/jira/browse/AVRO-1289
Project: Avro
Issue Type: Improvement
Components: python
Affects Versions: 1.7.5
Reporter: Jeremy Kahn
Assignee: Jeremy Kahn
Priority: Minor
Fix For: 1.8.0
Python {{avro.schema}} objects should be able to call back to a general
data-and-schema parallel-walker ("validate" would be one of those, but so could
be "default-filler").
There should be an {{avro.walker}} interface that owns the parallel state (a
datum-reader/deserializer, a datum-writer/serializer, a validator, or a
default-filler -- see AVRO-1265). Schema polymorphism would allow us to
eliminate the large (and highly redundant) function-dispatch methods in
{{avro.io}} by making the {{avro.schema.Schema}} subclass responsible for
calling back to the {{avro.walker}} object.
Assigning this to v1.8.0 because it may be difficult to duplicate *every*
behavior of 1.7.* with the same function signatures, especially where this
refactor may be eliminate entire classes.
This factoring ought to make it easier to improve or extend objects that meet
this {{walker}} interface -- validators & serializers might be able to store
more state about their position within a record, for example, to yield more
informative error messages upon mismatch (as requested by Jonathan Coveney on
the user mailing list).
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