iemejia commented on a change in pull request #10974: [BEAM-9384] Add
SchemaRegistry.getSchemaCoder to get SchemaCoders for registered types
URL: https://github.com/apache/beam/pull/10974#discussion_r384960299
##########
File path:
sdks/java/core/src/main/java/org/apache/beam/sdk/schemas/SchemaRegistry.java
##########
@@ -288,6 +281,38 @@ public void registerSchemaProvider(SchemaProvider
schemaProvider) {
return getProviderResult((SchemaProvider p) ->
p.fromRowFunction(typeDescriptor));
}
+ /**
+ * Retrieve a {@link SchemaCoder} for a given {@link Class} type. If no
schema exists, throws
+ * {@link * NoSuchSchemaException}.
+ */
+ public <T> SchemaCoder<T> getSchemaCoder(Class<T> clazz) throws
NoSuchSchemaException {
+ return getSchemaCoder(TypeDescriptor.of(clazz));
+ }
+
+ /**
+ * Retrieve a {@link SchemaCoder} for a given {@link TypeDescriptor} type.
If no schema exists,
+ * throws {@link * NoSuchSchemaException}.
+ */
+ public <T> SchemaCoder<T> getSchemaCoder(TypeDescriptor<T> typeDescriptor)
+ throws NoSuchSchemaException {
+ return SchemaCoder.of(
+ getSchema(typeDescriptor),
+ typeDescriptor,
+ getToRowFunction(typeDescriptor),
+ getFromRowFunction(typeDescriptor));
Review comment:
I agree with you in the fact that `SchemaCoder` is an internal detail that
regular users (authors of Pipelines) should not care about. I felt tempted to
mark this method as `@Internal` however PTransform authors (e.g. IO authors)
will find this useful (as I did for the PR I mention above for KafkaIO schema
support), so probably worth to let it available, also I cannot think of a
better place to put this method than here.
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